The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Is Fatimah - One of the best experts on this subject based on the ideXlab platform.
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green synthesis of hematite tud 1 nanocomposite as efficient photocatalyst for Bromophenol Blue and methyl violet degradation
Arabian Journal of Chemistry, 2020Co-Authors: Fitriana Harjati, Putwi Widya Citradewi, Gani Purwiandono, Is FatimahAbstract:Abstract Hematite immobilized on TUD-1 nanocomposite was prepared via sol-gel composite formation of biosynthesized hematite nanoparticles with TUD-1 precursor. The nanocomposite was characterized by various techniques such as X-ray diffraction, scanning electron microscopes/energy-dispersive X-ray spectroscopy, transmission electron microscope, gas sorption analysis, and UV–Visible diffuse reflectance spectrophotometer. Photocatalytic activity of the nanocomposite was examined in Bromophenol Blue and methyl violet degradation. The results showed that hematite nanoparticles obtained by the biosynthesis has particle size ranging at 20–100 nm. The nanocomposite of hematite/TUD-1 exhibit the homogeneous dispersion of the hematite in the mesoporous structured TUD-1. The smaller dispersed hematite nanoparticles affects to the increasing band gap energy of hematite, and is responsible for the efficient photocatalytic degradation of Bromophenol Blue and methyl violet. It is found that degradation efficiencies of the reactions over hematite/TUD-1 nanocomposite are 94.6% for Bromophenol Blue, and 96.7% for methyl violet. The degradation efficiency and kinetics constant of the degradation reaction expressed the effectiveness of the nanocomposite since the values are comparable with the hematite nanoparticles and other reported photocatalysts.
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Green synthesis of hematite/TUD-1 nanocomposite as efficient photocatalyst for Bromophenol Blue and methyl violet degradation
Arabian Journal of Chemistry, 2020Co-Authors: Fitriana Harjati, Putwi Widya Citradewi, Gani Purwiandono, Is FatimahAbstract:Abstract Hematite immobilized on TUD-1 nanocomposite was prepared via sol-gel composite formation of biosynthesized hematite nanoparticles with TUD-1 precursor. The nanocomposite was characterized by various techniques such as X-ray diffraction, scanning electron microscopes/energy-dispersive X-ray spectroscopy, transmission electron microscope, gas sorption analysis, and UV–Visible diffuse reflectance spectrophotometer. Photocatalytic activity of the nanocomposite was examined in Bromophenol Blue and methyl violet degradation. The results showed that hematite nanoparticles obtained by the biosynthesis has particle size ranging at 20–100 nm. The nanocomposite of hematite/TUD-1 exhibit the homogeneous dispersion of the hematite in the mesoporous structured TUD-1. The smaller dispersed hematite nanoparticles affects to the increasing band gap energy of hematite, and is responsible for the efficient photocatalytic degradation of Bromophenol Blue and methyl violet. It is found that degradation efficiencies of the reactions over hematite/TUD-1 nanocomposite are 94.6% for Bromophenol Blue, and 96.7% for methyl violet. The degradation efficiency and kinetics constant of the degradation reaction expressed the effectiveness of the nanocomposite since the values are comparable with the hematite nanoparticles and other reported photocatalysts.
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TiO2-pillared saponite and photosensitization using a ruthenium complex for photocatalytic enhancement of the photodegradation of Bromophenol Blue
Applied Clay Science, 2019Co-Authors: Is Fatimah, Rico Nurillahi, Sahroni, Oki MurazaAbstract:Abstract In this research, saponite pillarization with TiO2 and photosensitization using a tris(2,2′-bipyridyl)dichlororuthenium(II) complex were reported. The materials were characterized by elemental analysis, X-ray diffraction, gas sorption analysis, Fourier-transform infrared spectroscopy, and diffuse reflectance UV–Visible and scanning electron microscopy. The photocatalytic performance of the materials was studied for the photodegradation of Bromophenol Blue by considering factors including the light source, pH, and H2O2. The pillarization affected an increasing basal spacing d001 for the saponite from 14.95 A to 16.27 A and increased the specific surface area from 110 m2/g to 154 m2/g; meanwhile, the photosensitization did not significantly influence these characteristics. From diffuse reflectance UV–Visible analysis, the band gap energy for the titanium-pillared saponite was found to be 3.24 eV, and a shift in the absorption spectra towards the visible region was identified due to the photosensitization. Study of the photocatalytic activity for Bromophenol Blue photodegradation implied that increased photocatalytic performance was found for doping of the tris(2,2′-bipyridyl)dichlororuthenium(II) complex into TiO2 either under the UV or visible-light region. The performance was influenced by pH and H2O2, with optimum performance reached at pH = 10 and H2O2 concentration of 5 mmol/L.
Fitriana Harjati - One of the best experts on this subject based on the ideXlab platform.
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green synthesis of hematite tud 1 nanocomposite as efficient photocatalyst for Bromophenol Blue and methyl violet degradation
Arabian Journal of Chemistry, 2020Co-Authors: Fitriana Harjati, Putwi Widya Citradewi, Gani Purwiandono, Is FatimahAbstract:Abstract Hematite immobilized on TUD-1 nanocomposite was prepared via sol-gel composite formation of biosynthesized hematite nanoparticles with TUD-1 precursor. The nanocomposite was characterized by various techniques such as X-ray diffraction, scanning electron microscopes/energy-dispersive X-ray spectroscopy, transmission electron microscope, gas sorption analysis, and UV–Visible diffuse reflectance spectrophotometer. Photocatalytic activity of the nanocomposite was examined in Bromophenol Blue and methyl violet degradation. The results showed that hematite nanoparticles obtained by the biosynthesis has particle size ranging at 20–100 nm. The nanocomposite of hematite/TUD-1 exhibit the homogeneous dispersion of the hematite in the mesoporous structured TUD-1. The smaller dispersed hematite nanoparticles affects to the increasing band gap energy of hematite, and is responsible for the efficient photocatalytic degradation of Bromophenol Blue and methyl violet. It is found that degradation efficiencies of the reactions over hematite/TUD-1 nanocomposite are 94.6% for Bromophenol Blue, and 96.7% for methyl violet. The degradation efficiency and kinetics constant of the degradation reaction expressed the effectiveness of the nanocomposite since the values are comparable with the hematite nanoparticles and other reported photocatalysts.
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Green synthesis of hematite/TUD-1 nanocomposite as efficient photocatalyst for Bromophenol Blue and methyl violet degradation
Arabian Journal of Chemistry, 2020Co-Authors: Fitriana Harjati, Putwi Widya Citradewi, Gani Purwiandono, Is FatimahAbstract:Abstract Hematite immobilized on TUD-1 nanocomposite was prepared via sol-gel composite formation of biosynthesized hematite nanoparticles with TUD-1 precursor. The nanocomposite was characterized by various techniques such as X-ray diffraction, scanning electron microscopes/energy-dispersive X-ray spectroscopy, transmission electron microscope, gas sorption analysis, and UV–Visible diffuse reflectance spectrophotometer. Photocatalytic activity of the nanocomposite was examined in Bromophenol Blue and methyl violet degradation. The results showed that hematite nanoparticles obtained by the biosynthesis has particle size ranging at 20–100 nm. The nanocomposite of hematite/TUD-1 exhibit the homogeneous dispersion of the hematite in the mesoporous structured TUD-1. The smaller dispersed hematite nanoparticles affects to the increasing band gap energy of hematite, and is responsible for the efficient photocatalytic degradation of Bromophenol Blue and methyl violet. It is found that degradation efficiencies of the reactions over hematite/TUD-1 nanocomposite are 94.6% for Bromophenol Blue, and 96.7% for methyl violet. The degradation efficiency and kinetics constant of the degradation reaction expressed the effectiveness of the nanocomposite since the values are comparable with the hematite nanoparticles and other reported photocatalysts.
Emanuel Makrlík - One of the best experts on this subject based on the ideXlab platform.
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Extraction distribution of Bromophenol Blue and bromocresol green in the two-phase water-1,2-dichloroethane system
Zeitschrift für Physikalische Chemie, 2005Co-Authors: Emanuel MakrlíkAbstract:The equilibrium distribution constants of electroneutral Bromophenol Blue and bromocresol green between the 1,2-dichloroethane and aqueous phases were determined from extraction measurements. By using known thermodynamic parameters and applying general relations, the dissociation constants of these two organic dyes in 1,2-dichloroethane saturated with water were calculated.
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Thermodynamic parameters characterizing Bromophenol Blue and Bromocresol Green in the two-phase water-1,2-dichloroethane extraction system
Colloids and Surfaces, 1991Co-Authors: Emanuel MakrlíkAbstract:Abstract The equilibrium distribution constants of electroneutral Bromophenol Blue and Bromocresol Green between 1,2-dichloroethane and the aqueous phase have been determined from extraction measurements. By using known thermodynamic parameters and applying general equations, the dissociation constants of these two organic dyes in 1,2-dichloroethane saturated with water have been calculated.
Olga V. Kovalchukova - One of the best experts on this subject based on the ideXlab platform.
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Accurate investigation to determine the best conditions for using NiTiO3 for Bromophenol Blue degradation in the environment under UV–vis light based on concentration reduction and to compare it with TiO2
Environmental Nanotechnology Monitoring & Management, 2017Co-Authors: Yahya Absalan, Irena G. Bratchikova, Olga V. KovalchukovaAbstract:Abstract In this study, Bromophenol Blue was degraded by NiTiO3 nanoparticles under UV and Visible light irradiation. Due to the toxicity and harmful effects of the Bromophenol Blue compound in ground and surface water, its photocatalytic decomposition is of utmost importance. NiTiO3 photocatalyst was synthesized by thermal decomposition of titanium tetra butoxide using Ni(NO3)2·6H2O and was used for degradation under UV–vis irradiation. The obtained photocatalyst was characterized by UV–vis spectroscopy, powder X-ray diffraction (XRD), IR spectroscopy, scanning electron microscopy (SEM) and N2 absorption–desorption. BET analysis was performed to calculate the specific surface area, pore diameter, pore volume and percentage of mesopores of NiTiO3. The effects of parameters such as pH, catalyst dosages, and concentrations of Bromophenol Blue were examined. The results were compared with Degussa P25, a commercial TiO2 powder, which is commonly used in photocatalytic reactions. Additionally, degradation by TiO2 and NiTiO3 under UV and Visible light was tested; NiTiO3 under both UV and visible light showed higher degradation than TiO2 in the same conditions. The results show that NiTiO3 is able to reduce the concentration of Bromophenol Blue by 91.1% under visible light in an acidic environment.
F. V. Silva - One of the best experts on this subject based on the ideXlab platform.
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Monitoring Bromophenol Blue Transfer Across Water/1,2‐DCE Interface
Electroanalysis, 2002Co-Authors: M. H. M. Caçote, Carlos M. Pereira, F. V. SilvaAbstract:The transfer of a phenolsulfonephthalein dye (Bromophenol Blue, BPB) across the water/1, 2-dichloroethane (DCE) interface was studied by means of cyclic voltammetry, two-phase extraction techniques and in situ spectrophotometry. For the first time it was observed the transfer of two differently charged species originated from deprotonation of H2BPB. The values of the acidity constants were obtained (pK=3.1±0.2 and pK=pK 4.3±0.2) and an ionic partition diagram of BPB between water and DCE was constructed. The diagram is the basis for the proposed dye transfer mechanism which was validated using voltabsorptometric measurements. Physicochemical parameters were also obtained and relations between lipophilicity and structure accessed.
