The Experts below are selected from a list of 453 Experts worldwide ranked by ideXlab platform
Sylwia Mozia - One of the best experts on this subject based on the ideXlab platform.
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effectiveness of treatment of secondary effluent from a municipal wastewater treatment plant in a Photocatalytic Membrane Reactor and hybrid uv h2o2 ultrafiltration system
Chemical Engineering and Processing, 2017Co-Authors: Kacper Szymanski, Antoni W. Morawski, Sylwia MoziaAbstract:Abstract A comparison of effectiveness of two advanced oxidation processes, photocatalysis and ultraviolet (UV) irradiation enhanced with H2O2 addition, coupled with ultrafiltration (UF) for treatment of secondary effluent (SE) from a municipal wastewater treatment plant (WWTP) is presented. The results were compared with photolysis – UF system. The concentration of H2O2 in the UV/H2O2 – UF mode ranged from 0.03 to 0.3 g/L, the photocatalyst TiO2 P25 loading was changed from 0.5 to 2 g/L. A ceramic Membrane with ZrO2 separation layer was used. No significant influence of photocatalyst or H2O2 concentration on permeate flux was observed, however, both PMR (Photocatalytic Membrane Reactor) and UV/H2O2 – UF systems were less prone to fouling than the photolysis – UF one. Adsorption was found to be an important stage of total organic carbon (TOC) removal in PMR, while UF contributed mainly to photocatalyst rejection with minor effect on the overall treatment efficiency. The highest TOC removal of organic contaminants after 5 h of operation was found at 1.5 gTiO2/L in PMR (61%) and 0.15 gH2O2/L in UV/H2O2 – UF process (65%). The quality of permeate obtained in both systems was comparable, the product of the latter one exhibited lower ecotoxicity towards crustaceans Thamnocephalus platyurus than the PMR permeate.
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the influence of feed composition on fouling and stability of a polyethersulfone ultrafiltration Membrane in a Photocatalytic Membrane Reactor
Chemical Engineering Journal, 2017Co-Authors: Dominika Darowna, Antoni W. Morawski, Rafal J Wrobel, Sylwia MoziaAbstract:The investigations on the influence of humic acids (HAs) being representatives of Natural Organic Matter (NOM) and inorganic salts (NaHCO3, Na2HPO4 and Na2SO4) representing inorganic ions in natural waters, on fouling and stability of a polyethersulfone ultrafiltration Membrane in a Photocatalytic Membrane Reactor (PMR) are reported. The influence of inorganic ions on the permeate flux was dependent on their concentration and was more significant at higher salts content. The HCO3− ions contributed to the permeate flux decline to the highest extent, which was attributed to both a higher feed pH and a formation of a dense fouling layer. In the presence of SO42− the permeate flux was higher than in case of other ions which was explained in terms of lower thickness of the fouling cake caused by repulsion of TiO2 particles by the Membrane under such conditions. The most severe decrease of the permeate flux observed in the presence of a mixture of HAs and inorganic salts was attributed to the formation of a thick fouling cake caused by bridging effect between HAs molecules and TiO2 particles under high ionic strength conditions. The inorganic salts contributed also to a decrease of HAs decomposition rate due to the hole and hydroxyl radicals scavenging effect of the ions. It was found that the conditions prevailing in the PMR contributed to the loss of the Membrane separation properties towards dextrans due to the abrasive action of TiO2 particles. However, the extent of the observed decrease in the dextrans rejection was dependent on the feed composition.
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humic acids removal in a Photocatalytic Membrane Reactor with a ceramic uf Membrane
Chemical Engineering Journal, 2016Co-Authors: Kacper Szymanski, Antoni W. Morawski, Sylwia MoziaAbstract:Abstract The investigations on the influence of TiO2 photocatalyst (Aeroxide® P25) loading, feed cross-flow velocity (CFV) and feed water composition on the fouling of ceramic TiO2 ultrafiltration Membrane and removal of humic acids (HA) in a Photocatalytic Membrane Reactor (PMR) are presented. Moreover, the stability of the ceramic Membrane after 400 h of operation in the PMR is discussed. In case of model solution of HA in ultrapure water it was revealed that by an increase of TiO2 loading from 0.5 to 1.5 g/dm3 the Membrane fouling can be avoided. Alkaline conditions (pH 9) had a negative influence on the permeate flux and humic acids removal, whereas at pH 3 and pH 6.5 no Membrane fouling was noticed. In the presence of HCO3−, SO42− and HPO42− at both low and high concentrations the Membrane fouling was more severe than in the absence of these species, what was attributed to a lower efficiency of HA removal in the feed. Addition of Ca2+ and Mg2+ to the feed containing the inorganic anions allowed to improve the efficiency of HA removal and reduce Membrane fouling. After 400 h of PMR operation a deterioration of Membrane separation properties was observed what was attributed to the abrasive action of photocatalyst particles.
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a study on the stability of polyethersulfone ultrafiltration Membranes in a Photocatalytic Membrane Reactor
Journal of Membrane Science, 2015Co-Authors: Sylwia Mozia, Dominika Darowna, Rafal J Wrobel, Antoni W. MorawskiAbstract:Abstract To date no information about the stability of the polymer Membranes in Photocatalytic Membrane Reactors (PMRs) has been published. In order to implement this technology into the full scale the lifespan of the Membranes should be assessed. In this paper the investigations on the influence of Membrane properties, type of a TiO 2 photocatalyst (P25, ST-01, A700, and A800), a presence of oxidative species and the process parameters such as feed cross flow velocity and transMembrane pressure (TMP) on the stability of commercial polyethersulfone ultrafiltration Membranes with different cut-off in a PMR are presented. Under the conditions prevailing in the PMR all the tested Membranes lost their separation properties towards dextrans. The Membrane characterized by the finest pores and thus the most delicate skin layer was damaged to the highest extent. The small angular-shaped particles of ST-01 caused a more severe damage of the Membrane surface than the large round-edge shaped particles of A800. The deterioration of the Membrane separation properties was less severe at low (1 bar) TMP value compared to that at TMP of 3 bar. The loss of the separation properties of the Membranes was caused to a greater extent by the abrasion of their surface by the photocatalyst particles than by the action of oxidative species.
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effect of process parameters on fouling and stability of mf uf tio2 Membranes in a Photocatalytic Membrane Reactor
Separation and Purification Technology, 2015Co-Authors: Sylwia Mozia, Masahiro Toyoda, Beata Tryba, Kacper Szymanski, Beata Michalkiewicz, Antoni W. MorawskiAbstract:Abstract The investigations on the influence of TiO 2 photocatalyst (Aeroxide® TiO 2 P25) loading, feed cross-flow velocity ( v F ) and transMembrane pressure (TMP) on the fouling and stability of ceramic Membranes in a Photocatalytic Membrane Reactor are presented. Two ultrafiltration Membranes with molecular weight cut-off of 5 kDa (Filtanium 5) and 100 kDa (Filtanium 100), and one microfiltration Membrane (Filtanium 0.2) with maximum pore size of 0.2 μm were used. Regardless of the applied v F (3–6 m/s), TMP (1–3 bar) and TiO 2 P25 loading (0.5–1.5 g/dm 3 ) no permeate flux decline was observed when the UF Membranes were used. On the opposite, an increase of the flux for 5–10% compared to pure water flux due to abrasion of the Membranes separation layer by TiO 2 P25 particles was found. In case of MF Membrane a significant influence of v F and TMP on permeate flux was observed. Application of v F = 3 m/s led to a significant Membrane fouling while at v F = 6 m/s the permeate flux exceeded pure water flux in the whole range of TMP. The fine UF Filtanium 5 Membrane lost its separation properties due to abrasion by TiO 2 P25 particles, whereas the performance of the ordinary UF Filtanium 100 Membrane did not change during 100 h of operation in the PMR. Additionally, the influence of a commercial TiO 2 ST01 (Ishihara Sangyo, Japan) and laboratory made A700 (anatase) and A800 (rutile) on the permeate flux through Filtanium 100 Membrane were assessed. The difference between the lowest and the highest values of the permeate fluxes measured for various TiO 2 materials did not exceed 12%.
Antoni W. Morawski - One of the best experts on this subject based on the ideXlab platform.
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effectiveness of treatment of secondary effluent from a municipal wastewater treatment plant in a Photocatalytic Membrane Reactor and hybrid uv h2o2 ultrafiltration system
Chemical Engineering and Processing, 2017Co-Authors: Kacper Szymanski, Antoni W. Morawski, Sylwia MoziaAbstract:Abstract A comparison of effectiveness of two advanced oxidation processes, photocatalysis and ultraviolet (UV) irradiation enhanced with H2O2 addition, coupled with ultrafiltration (UF) for treatment of secondary effluent (SE) from a municipal wastewater treatment plant (WWTP) is presented. The results were compared with photolysis – UF system. The concentration of H2O2 in the UV/H2O2 – UF mode ranged from 0.03 to 0.3 g/L, the photocatalyst TiO2 P25 loading was changed from 0.5 to 2 g/L. A ceramic Membrane with ZrO2 separation layer was used. No significant influence of photocatalyst or H2O2 concentration on permeate flux was observed, however, both PMR (Photocatalytic Membrane Reactor) and UV/H2O2 – UF systems were less prone to fouling than the photolysis – UF one. Adsorption was found to be an important stage of total organic carbon (TOC) removal in PMR, while UF contributed mainly to photocatalyst rejection with minor effect on the overall treatment efficiency. The highest TOC removal of organic contaminants after 5 h of operation was found at 1.5 gTiO2/L in PMR (61%) and 0.15 gH2O2/L in UV/H2O2 – UF process (65%). The quality of permeate obtained in both systems was comparable, the product of the latter one exhibited lower ecotoxicity towards crustaceans Thamnocephalus platyurus than the PMR permeate.
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the influence of feed composition on fouling and stability of a polyethersulfone ultrafiltration Membrane in a Photocatalytic Membrane Reactor
Chemical Engineering Journal, 2017Co-Authors: Dominika Darowna, Antoni W. Morawski, Rafal J Wrobel, Sylwia MoziaAbstract:The investigations on the influence of humic acids (HAs) being representatives of Natural Organic Matter (NOM) and inorganic salts (NaHCO3, Na2HPO4 and Na2SO4) representing inorganic ions in natural waters, on fouling and stability of a polyethersulfone ultrafiltration Membrane in a Photocatalytic Membrane Reactor (PMR) are reported. The influence of inorganic ions on the permeate flux was dependent on their concentration and was more significant at higher salts content. The HCO3− ions contributed to the permeate flux decline to the highest extent, which was attributed to both a higher feed pH and a formation of a dense fouling layer. In the presence of SO42− the permeate flux was higher than in case of other ions which was explained in terms of lower thickness of the fouling cake caused by repulsion of TiO2 particles by the Membrane under such conditions. The most severe decrease of the permeate flux observed in the presence of a mixture of HAs and inorganic salts was attributed to the formation of a thick fouling cake caused by bridging effect between HAs molecules and TiO2 particles under high ionic strength conditions. The inorganic salts contributed also to a decrease of HAs decomposition rate due to the hole and hydroxyl radicals scavenging effect of the ions. It was found that the conditions prevailing in the PMR contributed to the loss of the Membrane separation properties towards dextrans due to the abrasive action of TiO2 particles. However, the extent of the observed decrease in the dextrans rejection was dependent on the feed composition.
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humic acids removal in a Photocatalytic Membrane Reactor with a ceramic uf Membrane
Chemical Engineering Journal, 2016Co-Authors: Kacper Szymanski, Antoni W. Morawski, Sylwia MoziaAbstract:Abstract The investigations on the influence of TiO2 photocatalyst (Aeroxide® P25) loading, feed cross-flow velocity (CFV) and feed water composition on the fouling of ceramic TiO2 ultrafiltration Membrane and removal of humic acids (HA) in a Photocatalytic Membrane Reactor (PMR) are presented. Moreover, the stability of the ceramic Membrane after 400 h of operation in the PMR is discussed. In case of model solution of HA in ultrapure water it was revealed that by an increase of TiO2 loading from 0.5 to 1.5 g/dm3 the Membrane fouling can be avoided. Alkaline conditions (pH 9) had a negative influence on the permeate flux and humic acids removal, whereas at pH 3 and pH 6.5 no Membrane fouling was noticed. In the presence of HCO3−, SO42− and HPO42− at both low and high concentrations the Membrane fouling was more severe than in the absence of these species, what was attributed to a lower efficiency of HA removal in the feed. Addition of Ca2+ and Mg2+ to the feed containing the inorganic anions allowed to improve the efficiency of HA removal and reduce Membrane fouling. After 400 h of PMR operation a deterioration of Membrane separation properties was observed what was attributed to the abrasive action of photocatalyst particles.
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a study on the stability of polyethersulfone ultrafiltration Membranes in a Photocatalytic Membrane Reactor
Journal of Membrane Science, 2015Co-Authors: Sylwia Mozia, Dominika Darowna, Rafal J Wrobel, Antoni W. MorawskiAbstract:Abstract To date no information about the stability of the polymer Membranes in Photocatalytic Membrane Reactors (PMRs) has been published. In order to implement this technology into the full scale the lifespan of the Membranes should be assessed. In this paper the investigations on the influence of Membrane properties, type of a TiO 2 photocatalyst (P25, ST-01, A700, and A800), a presence of oxidative species and the process parameters such as feed cross flow velocity and transMembrane pressure (TMP) on the stability of commercial polyethersulfone ultrafiltration Membranes with different cut-off in a PMR are presented. Under the conditions prevailing in the PMR all the tested Membranes lost their separation properties towards dextrans. The Membrane characterized by the finest pores and thus the most delicate skin layer was damaged to the highest extent. The small angular-shaped particles of ST-01 caused a more severe damage of the Membrane surface than the large round-edge shaped particles of A800. The deterioration of the Membrane separation properties was less severe at low (1 bar) TMP value compared to that at TMP of 3 bar. The loss of the separation properties of the Membranes was caused to a greater extent by the abrasion of their surface by the photocatalyst particles than by the action of oxidative species.
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effect of process parameters on fouling and stability of mf uf tio2 Membranes in a Photocatalytic Membrane Reactor
Separation and Purification Technology, 2015Co-Authors: Sylwia Mozia, Masahiro Toyoda, Beata Tryba, Kacper Szymanski, Beata Michalkiewicz, Antoni W. MorawskiAbstract:Abstract The investigations on the influence of TiO 2 photocatalyst (Aeroxide® TiO 2 P25) loading, feed cross-flow velocity ( v F ) and transMembrane pressure (TMP) on the fouling and stability of ceramic Membranes in a Photocatalytic Membrane Reactor are presented. Two ultrafiltration Membranes with molecular weight cut-off of 5 kDa (Filtanium 5) and 100 kDa (Filtanium 100), and one microfiltration Membrane (Filtanium 0.2) with maximum pore size of 0.2 μm were used. Regardless of the applied v F (3–6 m/s), TMP (1–3 bar) and TiO 2 P25 loading (0.5–1.5 g/dm 3 ) no permeate flux decline was observed when the UF Membranes were used. On the opposite, an increase of the flux for 5–10% compared to pure water flux due to abrasion of the Membranes separation layer by TiO 2 P25 particles was found. In case of MF Membrane a significant influence of v F and TMP on permeate flux was observed. Application of v F = 3 m/s led to a significant Membrane fouling while at v F = 6 m/s the permeate flux exceeded pure water flux in the whole range of TMP. The fine UF Filtanium 5 Membrane lost its separation properties due to abrasion by TiO 2 P25 particles, whereas the performance of the ordinary UF Filtanium 100 Membrane did not change during 100 h of operation in the PMR. Additionally, the influence of a commercial TiO 2 ST01 (Ishihara Sangyo, Japan) and laboratory made A700 (anatase) and A800 (rutile) on the permeate flux through Filtanium 100 Membrane were assessed. The difference between the lowest and the highest values of the permeate fluxes measured for various TiO 2 materials did not exceed 12%.
Takeshi Matsuura - One of the best experts on this subject based on the ideXlab platform.
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novel green hybrid processes for oily water photooxidation and purification from merchant ship
Desalination, 2016Co-Authors: A. Moslehyani, Mohd Hafiz Dzarfan Othman, Takeshi Matsuura, M Mobaraki, A F Ismail, M N K ChowdhuryAbstract:Abstract Two hybrid photooxidation systems consisting of two different Reactors; Photocatalytic Reactor-ultrafiltration (PR-UF) and Photocatalytic Membrane Reactor (PMR) have been investigated and compared for photolysis and separation of oily water. In both, oily water was irradiated by ultraviolet (UV) light. In PR, UV irradiation was made on the TiO2 photocatalyst suspended in oily water, followed by ultrafiltration (UF) to remove TiO2 particles and hydrocarbon residues. On the other hand, TiO2 was immobilized on the halloysite nanotube (HNT) and embedded in the UF Membrane in PMR. In both systems, hydrocarbon concentration, chemical oxygen demand (COD), total dissolved solid (TDS), and hydrocarbon concentration were measured at each step of photooxydation and filtration. In UF, Membrane flux, reduction in solute concentration, flux decline and flux recovery by backwashing were investigated. The experimental results showed that the reduction in TOC by PR-UF was ~ 10% higher than PMR. On the other hand, reduction in hydrocarbon concentration, COD and TDS was higher for PMR. The TiO2 concentration in UF permeate was 8 ppm and 0.2 ppm, respectively, for PR-UF and PMR.
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hydrocarbon degradation and separation of bilge water via a novel tio2 hnts pvdf based Photocatalytic Membrane Reactor pmr
RSC Advances, 2015Co-Authors: A. Moslehyani, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Takeshi MatsuuraAbstract:This paper focuses on the potential of a novel flat sheet nanocomposite titanium dioxide (TiO2)-halloysite nanotubes (HNTs)/polyvinylidene fluoride (PVDF) Membrane as a Photocatalytic separator in the Photocatalytic Membrane Reactor (PMR). The Photocatalytic nanocomposite Membrane acted the roles of both degradation and separation for bilge water. Both TiO2-HNTs photocatalyst and Photocatalytic nanocomposite Membranes were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) combined energy dispersive X-ray spectroscopy (EDX). The hydrocarbon degradation and removal efficiency of the PMR was evaluated by gas chromatography mass spectroscopy (GC-MS). It was found that 99.9% of hydrocarbons were removed by the PMR within 8 h, which is likely due to uniform distribution and high effectiveness of the TiO2-HNTs photocatalyst in the PVDF polymer matrix. The TiO2 leaching from the nanocomposite Membrane during the Membrane permeation was analyzed using flame atomic adsorption spectrophotometer (AAS), which recorded 1.0 ppb of TiO2 leaching in the permeate tank.
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Hydrocarbon degradation and separation of bilge water via a novel TiO2-HNTs/PVDF-based Photocatalytic Membrane Reactor (PMR)
RSC Advances, 2015Co-Authors: A. Moslehyani, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Takeshi MatsuuraAbstract:This paper focuses on the potential of a novel flat sheet nanocomposite titanium dioxide (TiO2)-halloysite nanotubes (HNTs)/polyvinylidene fluoride (PVDF) Membrane as a Photocatalytic separator in the Photocatalytic Membrane Reactor (PMR). The Photocatalytic nanocomposite Membrane acted the roles of both degradation and separation for bilge water. Both TiO2-HNTs photocatalyst and Photocatalytic nanocomposite Membranes were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) combined energy dispersive X-ray spectroscopy (EDX). The hydrocarbon degradation and removal efficiency of the PMR was evaluated by gas chromatography mass spectroscopy (GC-MS). It was found that 99.9% of hydrocarbons were removed by the PMR within 8 h, which is likely due to uniform distribution and high effectiveness of the TiO2-HNTs photocatalyst in the PVDF polymer matrix. The TiO2 leaching from the nanocomposite Membrane during the Membrane permeation was analyzed using flame atomic adsorption spectrophotometer (AAS), which recorded 1.0 ppb of TiO2 leaching in the permeate tank.
A. Moslehyani - One of the best experts on this subject based on the ideXlab platform.
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novel green hybrid processes for oily water photooxidation and purification from merchant ship
Desalination, 2016Co-Authors: A. Moslehyani, Mohd Hafiz Dzarfan Othman, Takeshi Matsuura, M Mobaraki, A F Ismail, M N K ChowdhuryAbstract:Abstract Two hybrid photooxidation systems consisting of two different Reactors; Photocatalytic Reactor-ultrafiltration (PR-UF) and Photocatalytic Membrane Reactor (PMR) have been investigated and compared for photolysis and separation of oily water. In both, oily water was irradiated by ultraviolet (UV) light. In PR, UV irradiation was made on the TiO2 photocatalyst suspended in oily water, followed by ultrafiltration (UF) to remove TiO2 particles and hydrocarbon residues. On the other hand, TiO2 was immobilized on the halloysite nanotube (HNT) and embedded in the UF Membrane in PMR. In both systems, hydrocarbon concentration, chemical oxygen demand (COD), total dissolved solid (TDS), and hydrocarbon concentration were measured at each step of photooxydation and filtration. In UF, Membrane flux, reduction in solute concentration, flux decline and flux recovery by backwashing were investigated. The experimental results showed that the reduction in TOC by PR-UF was ~ 10% higher than PMR. On the other hand, reduction in hydrocarbon concentration, COD and TDS was higher for PMR. The TiO2 concentration in UF permeate was 8 ppm and 0.2 ppm, respectively, for PR-UF and PMR.
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hydrocarbon degradation and separation of bilge water via a novel tio2 hnts pvdf based Photocatalytic Membrane Reactor pmr
RSC Advances, 2015Co-Authors: A. Moslehyani, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Takeshi MatsuuraAbstract:This paper focuses on the potential of a novel flat sheet nanocomposite titanium dioxide (TiO2)-halloysite nanotubes (HNTs)/polyvinylidene fluoride (PVDF) Membrane as a Photocatalytic separator in the Photocatalytic Membrane Reactor (PMR). The Photocatalytic nanocomposite Membrane acted the roles of both degradation and separation for bilge water. Both TiO2-HNTs photocatalyst and Photocatalytic nanocomposite Membranes were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) combined energy dispersive X-ray spectroscopy (EDX). The hydrocarbon degradation and removal efficiency of the PMR was evaluated by gas chromatography mass spectroscopy (GC-MS). It was found that 99.9% of hydrocarbons were removed by the PMR within 8 h, which is likely due to uniform distribution and high effectiveness of the TiO2-HNTs photocatalyst in the PVDF polymer matrix. The TiO2 leaching from the nanocomposite Membrane during the Membrane permeation was analyzed using flame atomic adsorption spectrophotometer (AAS), which recorded 1.0 ppb of TiO2 leaching in the permeate tank.
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Hydrocarbon degradation and separation of bilge water via a novel TiO2-HNTs/PVDF-based Photocatalytic Membrane Reactor (PMR)
RSC Advances, 2015Co-Authors: A. Moslehyani, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Takeshi MatsuuraAbstract:This paper focuses on the potential of a novel flat sheet nanocomposite titanium dioxide (TiO2)-halloysite nanotubes (HNTs)/polyvinylidene fluoride (PVDF) Membrane as a Photocatalytic separator in the Photocatalytic Membrane Reactor (PMR). The Photocatalytic nanocomposite Membrane acted the roles of both degradation and separation for bilge water. Both TiO2-HNTs photocatalyst and Photocatalytic nanocomposite Membranes were characterized by thermogravimetric analysis (TGA), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) combined energy dispersive X-ray spectroscopy (EDX). The hydrocarbon degradation and removal efficiency of the PMR was evaluated by gas chromatography mass spectroscopy (GC-MS). It was found that 99.9% of hydrocarbons were removed by the PMR within 8 h, which is likely due to uniform distribution and high effectiveness of the TiO2-HNTs photocatalyst in the PVDF polymer matrix. The TiO2 leaching from the nanocomposite Membrane during the Membrane permeation was analyzed using flame atomic adsorption spectrophotometer (AAS), which recorded 1.0 ppb of TiO2 leaching in the permeate tank.
Michio Inagaki - One of the best experts on this subject based on the ideXlab platform.
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application of anatase phase tio2 for decomposition of azo dye in a Photocatalytic Membrane Reactor
Desalination, 2009Co-Authors: Sylwia Mozia, Antoni W. Morawski, Masahiro Toyoda, Michio InagakiAbstract:Abstract The presented studies have focused on application of a new anatase-phase TiO2 for decomposition of azo dye Acid Red 18 in a Photocatalytic Membrane Reactor (PMR) combining photocatalysis and direct contact Membrane distillation (DCMD). The catalyst used in this study (A-700-1h) was prepared from TiO2 obtained directly from the production line (sulfate technology) at the Chemical Factory “Police” by calcination for 1 h at 973K in air. It was found that the effectiveness of the model dye degradation increased with increasing the value of all the parameters investigated, that is, feed flow rate, reaction temperature and catalyst loading. The addition of TiO2 to a feed did not affect the permeate flux, regardless of the catalyst loading applied. The effectiveness of azo dye removal in the PMR was compared with the effectiveness obtained during photocatalysis alone conducted in the recirculation and batch modes. Taking into account both, the rate of azo dye degradation and the quality of the product, the most beneficial configuration seems to be the PMR.
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effectiveness of photodecomposition of an azo dye on a novel anatase phase tio2 and two commercial photocatalysts in a Photocatalytic Membrane Reactor pmr
Separation and Purification Technology, 2008Co-Authors: Sylwia Mozia, Antoni W. Morawski, Masahiro Toyoda, Michio InagakiAbstract:Abstract An application of a newly prepared TiO 2 having anatase phase (A-700-1h) for decomposition of azo dye Acid Red 18 (AR18) in a Photocatalytic Membrane Reactor (PMR), coupling photocatalysis and Membrane distillation (MD) was investigated. The effectiveness of decomposition of the model dye using two commercially available TiO 2 photocatalysts – ST-01 and P25 was also determined in order to compare the results. The A-700-1h catalyst was prepared from a crude amorphous TiO 2 obtained directly from the production line (sulfate technology) at the Chemical Factory “Police” (Poland) by calcination for 1 h at 700 °C in air. The hybrid photocatalysis–MD process was conducted in a laboratory-scale installation with a capillary module equipped with polypropylene Membranes. It was found that the initial degradation rate r 0 of AR18 using the A-700-1h catalyst was 49–64% higher than in case of anatase ST-01. Moreover, the effectiveness of decolorization of the dye solution at the A-700-1h loading of 0.5 g/dm 3 determined on the basis of r 0 value was only ca. 8% lower compared to the value determined for the P25 photocatalyst. Taking into account the composition of permeate it was found that only a small amount of by-products of dye photodecomposition was transported through the MD Membrane. Moreover, a complete retention of the model dye was observed.
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comparison of effectiveness of methylene blue decomposition using pristine and carbon coated tio2 in a Photocatalytic Membrane Reactor
Desalination, 2007Co-Authors: Masahiro Toyoda, Sylwia Mozia, Michio Inagaki, Tomoki Tsumura, Antoni W. MorawskiAbstract:A comparison of effectiveness of methylene blue (MB) decomposition using pristine (ST-01) and carboncoated (SP-70-900) TiO2 in a Photocatalytic Membrane Reactor (PMR) combining photocatalysis and direct contact Membrane distillation (DCMD) is presented. In the first step of the research the effect of the addition of a photocatalyst to a feed on the permeate flux was investigated. The presence of pristine TiO2 did not affect the flux, regardless of the catalyst concentration applied. During the process performed with carbon-coated TiO2 a deterioration of the process capacity was observed, the most significant at the highest catalyst loading used (i.e. 1 g/dm3). The flux was lowered for ca. 10–25%, dependent on catalyst concentration. For the catalyst loading ≤0.5 g/dm3 the carboncoated TiO2 exhibited higher activity towards MB removal than pristine ST-01. The rate constant at photocatalyst concentration of 0.3 g/dm3 was higher for ca. 86% and at 0.5 g/dm3 for ca. 30% when carbon-coated TiO2 was applied instead of ST-01. Moreover, the rate constant of dye decomposition on SP-70-900 in concentration of 0.5 g/dm3 was only ca. 12% lower than in case of twice higher loading of ST-01 (i.e. 1.0 g/dm3). A very important advantage of the PMR presented is complete separation of catalyst particles, as well as dye and other non-volatile compounds. Thus, the product (distillate) has higher quality than in case of photocatalysis conducted without MD.
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application of carbon coated tio2 for decomposition of methylene blue in a Photocatalytic Membrane Reactor
Journal of Hazardous Materials, 2007Co-Authors: Sylwia Mozia, Masahiro Toyoda, Michio Inagaki, Beata Tryba, Antoni W. MorawskiAbstract:An application of carbon-coated TiO(2) for decomposition of methylene blue (MB) in a Photocatalytic Membrane Reactor (PMR), coupling photocatalysis and direct contact Membrane distillation (DCMD) was investigated. Moreover, photodegradation of a model pollutant in a batch Reactor without Membrane distillation (MD) was also examined. Carbon-modified TiO(2) catalysts containing different amount of carbon and commercially available TiO(2) (ST-01) were used in this study. The carbon-coated catalyst prepared from a mixture of ST-01 and polyvinyl alcohol in the mass ratio of 70/30 was the most effective in degradation of MB from all of the photocatalysts applied. Photodecomposition of MB on the recovered photocatalysts was lower than on the fresh ones. The photodegradation of MB in the PMR was slower than in the batch Reactor, what probably resulted from shorter time of exposure of the catalyst particles to UV irradiation. The MD process could be successfully applied for separation of photocatalyst and by-products from the feed solution.