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Ahmad Fauzi Ismail - One of the best experts on this subject based on the ideXlab platform.
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Surface Modifications of Nanofillers for Carbon Dioxide Separation Nanocomposite Membrane
Symmetry, 2020Co-Authors: Pei Sean Goh, Ahmad Fauzi Ismail, Kar Chun Wong, Lukka Thuyavan Yogarathinam, Mohd Sohaimi AbdullahAbstract:CO2 separation is an important process for a wide spectrum of industries including petrochemical, refinery and coal-fired power plant industries. The Membrane-based process is a promising operation for CO2 separation owing to its fundamental engineering and economic benefits over the conventionally used separation processes. Asymmetric polymer–inorganic Nanocomposite Membranes are endowed with interesting properties for gas separation processes. The presence of nanosized inorganic nanofiller has offered unprecedented opportunities to address the issues of conventionally used polymeric Membranes. Surface modification of nanofillers has become an important strategy to address the shortcomings of Nanocomposite Membranes in terms of nanofiller agglomeration and poor dispersion and polymer–nanofiller incompatibility. In the context of CO2 gas separation, surface modification of nanofiller is also accomplished to render additional CO2 sorption capacity and facilitated transport properties. This article focuses on the current strategies employed for the surface modification of nanofillers used in the development of CO2 separation Nanocomposite Membranes. A review based on the recent progresses made in physical and chemical modifications of nanofiller using various techniques and modifying agents is presented. The effectiveness of each strategy and the correlation between the surface modified nanofiller and the CO2 separation performance of the resultant Nanocomposite Membranes are thoroughly discussed.
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preparation and performance of pvdf based Nanocomposite Membrane consisting of tio2 nanofibers for organic pollutant decomposition in wastewater under uv irradiation
Desalination, 2016Co-Authors: Nor Azureen Mohamad Nor, Mohamad Azuwa Mohamed, Juhana Jaafar, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Woei Jye Lau, Mukhlis A Rahman, Norhaniza YusofAbstract:Abstract Polyvinylidene Fluoride (PVDF) Nanocomposite Membrane consisting of electrospun titanium dioxide (TiO 2 ) nanofibers (PVDF/e-TiO 2 ) was prepared by hot pressing the as-spun TiO 2 nanofibers onto PVDF flat sheet Membrane. The TiO 2 nanofibers act as a photocatalyst to decompose organic pollutants present in wastewater under UV irradiation, while PVDF Membrane acts as a support. The hot press technique was carried out by applying the operating temperatures at 100 °C, 160 °C and 180 °C for 30 min. The Nanocomposite Membrane was characterized by FESEM, EDX, contact angle measurement, DSC, and UV–Vis–NIR spectroscopy. The FESEM images and EDX analysis showed good adhesion and dispersion of TiO 2 nanofibers in PVDF Membrane. The hot-pressed PVDF/e-TiO 2 Membrane at lower temperature (100 °C) (PVDF/e-TiO 2 -100) is more hydrophilic, higher pure water flux and has higher UV absorbance compared to the PVDF/e-TiO 2 -160 and PVDF/e-TiO 2 -180 Membranes. The concentration of bisphenol A (BPA) in the feed solution was found to reduce with the degradation percentage of 63% to 85% after the PVDF/e-TiO 2 Nanocomposite Membrane was treated with UV radiation. The results indicated that the introduction of TiO 2 nanofibers in PVDF-based Nanocomposite Membrane via hot pressing indeed plays an important role towards enhancing the degradation and filtration of organic pollutants such as BPA.
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the potential of direct contact Membrane distillation for industrial textile wastewater treatment using pvdf cloisite 15a Nanocomposite Membrane
Chemical Engineering Research & Design, 2016Co-Authors: Ahmad Fauzi Ismail, Woei Jye Lau, Nadzirah Mohd Mokhtar, Sutrasno Kartohardjono, S O Lai, H C TeohAbstract:This work demonstrates the feasibility of employing direct contact Membrane distillation (DCMD) for treating industrial textile wastewater for clean water production. Experimental results showed that the in-house fabricated polyvinylidene fluoride-Cloisite 15A polymer–inorganic Nanocomposite Membrane is robust and able to treat the industrial effluent by reducing at least 89% of the initial values of the water quality parameters measured. However, the Membrane permeate flux was reported to decline almost 50% in the first few hours of the 40-h treatment process before reaching water flux of 13–22 kg/m2 h. It is believed that the initial flux decline is mainly caused by the foulants accumulated on the Membrane outer surface that increases mass transfer resistance of water molecules and reduces water productivity. With respect to separation characteristics, the DCMD process has shown better performance for COD and color removal in comparison to the other commonly used pressure-driven Membrane processes. Further improvement on the Membrane surface properties is necessary to reduce fouling propensity and pore wetting caused by the surfactants and other foulants in the textile wastewater. This is of particular importance for long-term operation of DCMD process.
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Physicochemical characteristic of regenerated cellulose/N-doped TiO2 Nanocomposite Membrane fabricated from recycled newspaper with photocatalytic activity under UV and visible light irradiation
Chemical Engineering Journal, 2016Co-Authors: Mohamad Azuwa Mohamed, Muhazri Abd Mutalib, Nur Aimie Abdullah Sani, Wan Norharyati Wan Salleh, Juhana Jaafar, Ahmad Fauzi Ismail, S. E. A. M. AsriAbstract:Abstract The use of recycled newspaper as sustainable cellulose resource for the fabrication of green organic/inorganic hybrid photocatalytic Membrane via phase inversion method was highlighted in this study. The incorporation of N-doped TiO2 nanorods as a Nanocomposite in regenerated cellulose Membrane matrix to great extent has altered its morphological and physicochemical properties, as revealed by FESEM, AFM, FTIR, XRD, XPS, and UV–visible spectroscopy analyses. FTIR analysis suggested that there is a strong interaction between the hydroxyl groups of regenerated cellulose (RC) and the TiO2 nanorods through hydrogen bonding interactions. The UV–visible spectroscopy and XPS analysis confirmed that the highly visible light absorption capability of the prepared RC/TiO2 Nanocomposite Membrane is due to the existence of nitrogen as dopant in the TiO2 lattice structure. The resultant Membranes showed a significant photocatalytic performance in the degradation of phenol in aqueous solution under UV and visible light irradiation, respectively. It was found that 0.5 wt% of TiO2 nanorods was the best loading in the regenerated cellulose Membrane (RCM) with desirable physicochemical and photocatalytic properties. This study promotes the use of RC/TiO2 Nanocomposite Membrane as a new and green portable photocatalyst in the field of wastewater treatment without leaving any photocatalyst in the reaction system. It is crucial to emphasize that the use of a non-toxic solvent-based system in this study provide a significant contribution towards the development of a green technology system.
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physicochemical characteristic of regenerated cellulose n doped tio2 Nanocomposite Membrane fabricated from recycled newspaper with photocatalytic activity under uv and visible light irradiation
Chemical Engineering Journal, 2016Co-Authors: Mohamad Azuwa Mohamed, Muhazri Abd Mutalib, Nur Aimie Abdullah Sani, S. E. A. M. Asri, Wan Norharyati Wan Salleh, Juhana Jaafar, Ahmad Fauzi Ismail, Chi Siang OngAbstract:Abstract The use of recycled newspaper as sustainable cellulose resource for the fabrication of green organic/inorganic hybrid photocatalytic Membrane via phase inversion method was highlighted in this study. The incorporation of N-doped TiO2 nanorods as a Nanocomposite in regenerated cellulose Membrane matrix to great extent has altered its morphological and physicochemical properties, as revealed by FESEM, AFM, FTIR, XRD, XPS, and UV–visible spectroscopy analyses. FTIR analysis suggested that there is a strong interaction between the hydroxyl groups of regenerated cellulose (RC) and the TiO2 nanorods through hydrogen bonding interactions. The UV–visible spectroscopy and XPS analysis confirmed that the highly visible light absorption capability of the prepared RC/TiO2 Nanocomposite Membrane is due to the existence of nitrogen as dopant in the TiO2 lattice structure. The resultant Membranes showed a significant photocatalytic performance in the degradation of phenol in aqueous solution under UV and visible light irradiation, respectively. It was found that 0.5 wt% of TiO2 nanorods was the best loading in the regenerated cellulose Membrane (RCM) with desirable physicochemical and photocatalytic properties. This study promotes the use of RC/TiO2 Nanocomposite Membrane as a new and green portable photocatalyst in the field of wastewater treatment without leaving any photocatalyst in the reaction system. It is crucial to emphasize that the use of a non-toxic solvent-based system in this study provide a significant contribution towards the development of a green technology system.
Takeshi Matsuura - One of the best experts on this subject based on the ideXlab platform.
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design and performance study of hybrid photocatalytic reactor pvdf mwcnt Nanocomposite Membrane system for treatment of petroleum refinery wastewater
Desalination, 2015Co-Authors: A. Moslehyani, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Takeshi MatsuuraAbstract:This study focuses on the design and performance of a hybrid system consisting of a photocatalytic reactor and a Membrane permeation cell. Initially, an ultraviolet lamp was installed in the photocatalytic reactor to decompose the organic pollutants in the presence of 200 ppm titanium-dioxide (TiO2). Individual hydrocarbon pollutants were identified by gas chromatography–mass spectrometry (GC–MS) analysis of wastewater samples. Polyvinylidene fluoride (PVDF)/multi-walled carbon nanotube (MWCNT) Nanocomposite Membranes were fabricated to enhance the rejection, flux and fouling resistance for full filtration of pollutants from photocatalytic reactor such as decomposed refinery wastewater and TiO2 photocatalyst. The Nanocomposite Membranes were characterized by Fourier transform infrared (FTIR), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The TiO2 cross-over during permeation was detected by using an atomic adsorption spectrometer, which proved that TiO2 rejection was more than 99% for oxidized MWCNT Nanocomposite Membranes. Furthermore, GC–MS analysis was concluded over 90% decomposition which occurred by photocatalytic reaction and practically all pollutants were removed by ultrafiltration permeation cell. The Nanocomposite Membrane with 1.0 wt.% of oxidized MWCNTs incorporated in PVDF matrix was found to be the best Nanocomposite Membrane among all of the fabricated Membranes for the filtration purposes, due to the over 99% rejection and excellent anti-fouling property.
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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.
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the potential of thin film Nanocomposite Membrane in reducing organic fouling in forward osmosis process
Desalination, 2014Co-Authors: Woei Jye Lau, Takeshi Matsuura, Daryoush Emadzadeh, Nidal Hilal, Ahmad Fauzi IsmailAbstract:A major limiting factor of forward osmosis (FO) Membrane, particularly in pressure retarded osmosis (PRO) mode, is fouling by natural organic matters. In this work, we investigated the effect of the Nanocomposite substrate on the fouling of a thin film Nanocomposite (TFN) Membrane due to organic foulants in PRO mode. The TFN Membrane was synthesized by coating a polyamide film over the surface of substrate made of polysulfone–titanium dioxide. The TFN Membrane always showed much higher FO water flux than the typical thin film composite TFC Membrane prepared from the pristine polysulfone substrate. Reduced internal concentration polarization following a significant decrease of the structural parameter in the Nanocomposite substrate causes the mass transfer coefficient of the substrate to increase. In the PRO mode, BSA removal in the presence of Ca2 + confirmed that the TFN FO Membrane could significantly mitigate fouling tendency compared to a typical TFC Membrane. Results also showed that fouling in TFN FO is highly reversible, recovering > 92% permeate flux after a simple water rinse process. A complete study of the Membrane fouling was reported with detailed scientific discussion. To the best of our knowledge, this is the first report on the effect of the Nanocomposite Membrane on Membrane fouling in PRO mode.
Mohamad Azuwa Mohamed - One of the best experts on this subject based on the ideXlab platform.
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preparation and performance of pvdf based Nanocomposite Membrane consisting of tio2 nanofibers for organic pollutant decomposition in wastewater under uv irradiation
Desalination, 2016Co-Authors: Nor Azureen Mohamad Nor, Mohamad Azuwa Mohamed, Juhana Jaafar, Ahmad Fauzi Ismail, Mohd Hafiz Dzarfan Othman, Woei Jye Lau, Mukhlis A Rahman, Norhaniza YusofAbstract:Abstract Polyvinylidene Fluoride (PVDF) Nanocomposite Membrane consisting of electrospun titanium dioxide (TiO 2 ) nanofibers (PVDF/e-TiO 2 ) was prepared by hot pressing the as-spun TiO 2 nanofibers onto PVDF flat sheet Membrane. The TiO 2 nanofibers act as a photocatalyst to decompose organic pollutants present in wastewater under UV irradiation, while PVDF Membrane acts as a support. The hot press technique was carried out by applying the operating temperatures at 100 °C, 160 °C and 180 °C for 30 min. The Nanocomposite Membrane was characterized by FESEM, EDX, contact angle measurement, DSC, and UV–Vis–NIR spectroscopy. The FESEM images and EDX analysis showed good adhesion and dispersion of TiO 2 nanofibers in PVDF Membrane. The hot-pressed PVDF/e-TiO 2 Membrane at lower temperature (100 °C) (PVDF/e-TiO 2 -100) is more hydrophilic, higher pure water flux and has higher UV absorbance compared to the PVDF/e-TiO 2 -160 and PVDF/e-TiO 2 -180 Membranes. The concentration of bisphenol A (BPA) in the feed solution was found to reduce with the degradation percentage of 63% to 85% after the PVDF/e-TiO 2 Nanocomposite Membrane was treated with UV radiation. The results indicated that the introduction of TiO 2 nanofibers in PVDF-based Nanocomposite Membrane via hot pressing indeed plays an important role towards enhancing the degradation and filtration of organic pollutants such as BPA.
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Physicochemical characteristic of regenerated cellulose/N-doped TiO2 Nanocomposite Membrane fabricated from recycled newspaper with photocatalytic activity under UV and visible light irradiation
Chemical Engineering Journal, 2016Co-Authors: Mohamad Azuwa Mohamed, Muhazri Abd Mutalib, Nur Aimie Abdullah Sani, Wan Norharyati Wan Salleh, Juhana Jaafar, Ahmad Fauzi Ismail, S. E. A. M. AsriAbstract:Abstract The use of recycled newspaper as sustainable cellulose resource for the fabrication of green organic/inorganic hybrid photocatalytic Membrane via phase inversion method was highlighted in this study. The incorporation of N-doped TiO2 nanorods as a Nanocomposite in regenerated cellulose Membrane matrix to great extent has altered its morphological and physicochemical properties, as revealed by FESEM, AFM, FTIR, XRD, XPS, and UV–visible spectroscopy analyses. FTIR analysis suggested that there is a strong interaction between the hydroxyl groups of regenerated cellulose (RC) and the TiO2 nanorods through hydrogen bonding interactions. The UV–visible spectroscopy and XPS analysis confirmed that the highly visible light absorption capability of the prepared RC/TiO2 Nanocomposite Membrane is due to the existence of nitrogen as dopant in the TiO2 lattice structure. The resultant Membranes showed a significant photocatalytic performance in the degradation of phenol in aqueous solution under UV and visible light irradiation, respectively. It was found that 0.5 wt% of TiO2 nanorods was the best loading in the regenerated cellulose Membrane (RCM) with desirable physicochemical and photocatalytic properties. This study promotes the use of RC/TiO2 Nanocomposite Membrane as a new and green portable photocatalyst in the field of wastewater treatment without leaving any photocatalyst in the reaction system. It is crucial to emphasize that the use of a non-toxic solvent-based system in this study provide a significant contribution towards the development of a green technology system.
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physicochemical characteristic of regenerated cellulose n doped tio2 Nanocomposite Membrane fabricated from recycled newspaper with photocatalytic activity under uv and visible light irradiation
Chemical Engineering Journal, 2016Co-Authors: Mohamad Azuwa Mohamed, Muhazri Abd Mutalib, Nur Aimie Abdullah Sani, S. E. A. M. Asri, Wan Norharyati Wan Salleh, Juhana Jaafar, Ahmad Fauzi Ismail, Chi Siang OngAbstract:Abstract The use of recycled newspaper as sustainable cellulose resource for the fabrication of green organic/inorganic hybrid photocatalytic Membrane via phase inversion method was highlighted in this study. The incorporation of N-doped TiO2 nanorods as a Nanocomposite in regenerated cellulose Membrane matrix to great extent has altered its morphological and physicochemical properties, as revealed by FESEM, AFM, FTIR, XRD, XPS, and UV–visible spectroscopy analyses. FTIR analysis suggested that there is a strong interaction between the hydroxyl groups of regenerated cellulose (RC) and the TiO2 nanorods through hydrogen bonding interactions. The UV–visible spectroscopy and XPS analysis confirmed that the highly visible light absorption capability of the prepared RC/TiO2 Nanocomposite Membrane is due to the existence of nitrogen as dopant in the TiO2 lattice structure. The resultant Membranes showed a significant photocatalytic performance in the degradation of phenol in aqueous solution under UV and visible light irradiation, respectively. It was found that 0.5 wt% of TiO2 nanorods was the best loading in the regenerated cellulose Membrane (RCM) with desirable physicochemical and photocatalytic properties. This study promotes the use of RC/TiO2 Nanocomposite Membrane as a new and green portable photocatalyst in the field of wastewater treatment without leaving any photocatalyst in the reaction system. It is crucial to emphasize that the use of a non-toxic solvent-based system in this study provide a significant contribution towards the development of a green technology system.
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Titanium dioxide nanorods in regenerated cellulose Membrane for photocatalytic degradation of phenol
2015Co-Authors: Mohamad Azuwa MohamedAbstract:Polymer-inorganic Nanocomposite Membrane was successfully prepared via incorporation of nitrogen doped (N-doped) titanium dixide (TiO2) anatase/rutile mixed phase nanorods in the cellulose microfiber by using phase inversion technique. The use of the non-toxic solvent-based system and recycled newspapers as the cellulose source in this study provides a significant contribution towards the development of a green technology system. The incorporation of N-doped TiO2 nanorods that have been calcined at 400°C (T400) in regenerated cellulose Membrane matrix has altered significantly its morphological and physicochemical properties, as revealed by Fourier Transform Infrared (FTIR), Field Electron Scanning Microscopy (FESEM), Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM), UV-vis spectroscopy, Thermal Gravimetric Analysis (TGA), X-ray Diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis. The UV-vis spectroscopy and XPS analysis confirmed that the highly visible light absorption capability of the prepared regenerated cellulose/titanium dioxide (RC/TiO2) Nanocomposite Membrane is due to the existence of nitrogen as dopant in the TiO2 lattice structure at 396.8, 397.5, 398.7, 399.8, and 401 eV. It was found that 0.5 wt % of N-doped TiO2 nanorods (T400) is the best loading in the regenerated cellulose/titanium dioxide (RC/TiO2) Nanocomposite Membrane with desirable morphological, physicochemical and photocatalytic properties. The RC/TiO2-0.5 exhibited the highest photocatalytic activity of 96 % and 78.8 % in degradation phenol after 360 minutes under visible and UV lights irradiation. From the findings, this study promotes the use of RC/TiO2 Nanocomposite Membrane as a new green portable photocatalyst in the field of wastewater treatment without any residue of photocatalyst in the reaction system.
Shichang Wang - One of the best experts on this subject based on the ideXlab platform.
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thermal conductivity of graphene poly vinylidene fluoride Nanocomposite Membrane
Materials & Design, 2017Co-Authors: Hong Guo, Jixiao Wang, Shichang WangAbstract:Abstract Compared to metallic materials for the use of heat exchanger, polymeric materials have been enjoyed superior advantages such as corrosion resistance, low density, fouling resistance, facile processing and low cost. Poly(vinylidene fluoride) (PVDF) is semi-crystalline thermoplastic polymer with excellent corrosion resistance, thermal and electrochemical stability. In order to improve its thermal conductivity, graphene/PVDF composites were prepared and studied in this paper. The graphene was doped in PVDF matrix for preparing graphene/PVDF composite Membranes. In addition, electric field was applied for graphene alignment during Membrane formation. The morphology, structure, thermal conductivity and tensile strength of the composite Membranes before and after alignment were characterized and analyzed. The tensile strength and thermal conductivity of composite Membranes were significant improved with the addition of graphene. This tendency was further enhanced by the application of electric field. When graphene content was 20 wt%, the thermal conductivity of the composite Membrane was increased by 212% than that of pure PVDF and it was further enhanced to 226% after applying electric field. The maximum tensile strength was obtained when graphene content was 3 wt%. This study may be beneficial to further development of thermal conductive polymeric materials.
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psf pani Nanocomposite Membrane prepared by in situ blending of psf and pani nmp
Journal of Membrane Science, 2011Co-Authors: Song Zhao, Zhi Wang, Jixiao Wang, Shangbao Yang, Shichang WangAbstract:A simplified method to prepare polysulfone (PSf)/polyaniline (PANI) Nanocomposite Membrane was proposed. With this method, aniline was polymerized using ammonium peroxydisulfate as oxidant and N-methyl-2-pyrrolidone (NMP) as solvent, which was also the solvent of PSf. The mixture after aniline polymerization containing PANI nanospheres, PANI oligomers, NMP and inorganic ions, named PANI/NMP, was added directly into the solution consisting of PSf and NMP without any post-processing to form Membrane casting solution. Then, PSf/PANI Nanocomposite Membranes were prepared via immersion phase inversion process using the casing solution. This method is called in situ blending method. PANI oligomers were soluble in both water and organic solvent while PANI nanospheres were dispersed in both water and organic solvent. The behaviors of PANI oligomers and PANI nanospheres during Membrane formation were investigated and analyzed. A large portion of PANI oligomers and a small portion of PANI nanospheres would be leached out of the casting film during the phase separation and act as pore formers, inducing the enhancement of Membrane porosity and surface pore size. A large portion of PANI nanospheres and a small portion of PANI oligomers residing in the prepared Membranes favored the enhancement of Membrane hydrophilicity, breaking strength and thermal stability. Compared with PSf Membrane, PSf/PANI Nanocomposite Membranes obtained with this method had more hydrophilic surface, higher porosity, larger surface pore size, less acicular pores, thicker skinlayer, wider pores beneath the skinlayer, better vertically interconnected finger-like pores and less macrovoids. Pure water fluxes of PSf/PANI Nanocomposite Membranes were 1.7–4.1 times that of PSf Membrane and BSA rejections of the Membranes were all above 96%. During BSA ultrafiltration, PSf/PANI Nanocomposite Membranes showed slower flux decline rate and higher flux recovery ratio values after simple water flushing than PSf Membrane.
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preparation and characterization of polyaniline polysulfone Nanocomposite ultrafiltration Membrane
Journal of Membrane Science, 2008Co-Authors: Zhifeng Fan, Zhi Wang, Jixiao Wang, Meirong Duan, Shichang WangAbstract:Novel Nanocomposite Membrane was prepared through the filtration of polyaniline (PANI) nanofiber aqueous dispersion with polysulfone (PS) ultrafiltration (UF) Membrane. Scanning electron microscope (SEM) images showed that PANI nanofiber layer was formed on the PS Membrane surface. Atomic force microscopy (AFM) analysis indicated that the Nanocomposite Membrane had rougher surface than the PS substrate Membrane. Compared with the PS substrate Membrane, the Nanocomposite Membrane had much better permeability for the good hydrophilicity of PANI nanofiber layer, and had almost the same rejection performance. In addition, the Nanocomposite Membrane had positive surface potential under acidic condition because PANI could be protonated easily by acid. During the filtration of BSA solution, the Nanocomposite Membrane showed much better antifouling performance than the substrate Membrane for the hydrophilicity and steric hindrance effect of its nanofiber layer. Moreover, under acidic solution condition, strong electrostatic repulsion between PANI nanofibers and BSA existed and improved Membrane antifouling performance further.
Xinlei Liu - One of the best experts on this subject based on the ideXlab platform.
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metal organic framework zif 8 Nanocomposite Membrane for efficient recovery of furfural via pervaporation and vapor permeation
Journal of Membrane Science, 2013Co-Authors: Xinlei Liu, Hua Jin, Helge Bux, Yujie Ban, Weishen YangAbstract:Furfural (2-furancarboxaldehyde) has been regarded as an important platform molecule in biorefinery and has gain a wide range of applications. With the state-of-the-art biorefinery technique, the concentration of furfural in the product water stream is generally low (around 3 wt%). It is therefore highly desirable to develop efficient alternative recovery technologies that can lower the recovery costs, thus improving the economics of furfural production. In this work, a homogeneous ZIF-8-silicone rubber Nanocomposite Membrane with high particle loading was successfully fabricated on a hierarchically ordered stainless-steel-mesh (HOSSM) employing a novel "Plugging-Filling" method. The Membrane exhibits the highest pervaporation separation index (separation factor 53.3 and total flux 0.90 kg m(-2) h(-1)) reported so far and excellent stability in a test of more than 120 h at 80 degrees C for recovery of furfural (1.0 wt%) from water. This very high performance should be attributed to the exceptional adsorption selectivity and capacity of ZIF-8 toward furfural molecules and the effects of space restriction and physical cross-linking of the HOSSM. This is a good demonstration of the potential of MOF Membranes for separating biomass derived compounds in biorefinery processes. (C) 2012 Elsevier B.V. All rights reserved.
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capillary supported ultrathin homogeneous silicalite poly dimethylsiloxane Nanocomposite Membrane for bio butanol recovery
Journal of Membrane Science, 2011Co-Authors: Xinlei Liu, Yi Liu, Guangqi Zhu, Jie Liu, Weishen YangAbstract:An ultrathin (300 nm) homogeneous silicalite-poly(dimethylsiloxane) (PDMS) Nanocomposite Membrane was fabricated on capillary support by a "Packing-filling" method. Firstly, silicalite-1 nano-crystals were deposited onto a porous alumina capillary support using dip-coating technique (packing); secondly, the interspaces among the nano-crystals were filled with PDMS phase (filling). No voids between nano-crystals and PDMS phase were observed by scanning electron microscopy (SEM), suggesting good zeolite-polymer adhesion. The Membrane possesses very high flux (5.0-11.2 kg m(-2) h(-1)) and good separation factor (25.0-41.6) for the pervaporative recovery of iso-butanol from aqueous solution (0.2-3 wt.%) at 80 degrees C. Such properties offer great potential towards applications in fermentation-pervaporation coupled processes. The effects of feed temperature and concentration on the pervaporation performance of this Nanocomposite Membrane were investigated. (C) 2010 Elsevier B.V. All rights reserved.
