The Experts below are selected from a list of 91572 Experts worldwide ranked by ideXlab platform
Yongfa Zhu - One of the best experts on this subject based on the ideXlab platform.
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enhanced Organic Pollutant photodegradation via adsorption photocatalysis synergy using a 3d g c3n4 tio2 free separation photocatalyst
Chemical Engineering Journal, 2019Co-Authors: Yuqiang Sheng, Zhen Wei, Hong Miao, Wenqing Yao, Yongfa ZhuAbstract:Abstract The three dimensions (3D) g-C3N4/TiO2 heterojunction photocatalyst has been synthesized and exhibits efficient Pollutant degradation performances. The degradation efficiency of methylene blue (MB) and phenol is 4.0 and 4.5 times as high as bulk g-C3N4 in static system. In dynamic system, the Pollutant can be continuously degraded without separation, and it is very stable for 90 h with a removal rate of 16.0%. The enhanced activity is mainly attributed to the 3D structure and heterojunction of g-C3N4/TiO2. The 3D structure can not only effectively improve the adsorption-enrichment capability, but also supply multidimensional mass and electron transfer channels. Meanwhile, the heterojunction can promote the separation and migration of the photo-generated carriers. Therefore, the 3D g-C3N4/TiO2 heterojunction photocatalyst with separation free can facilitate the potential application in the treatment of water pollution.
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enhanced visible light driven photocatalytic disinfection performance and Organic Pollutant degradation activity of porous g c3n4 nanosheets
ACS Applied Materials & Interfaces, 2017Co-Authors: Zhouping Wang, Yongfa ZhuAbstract:Porous g-C3N4 nanosheet (PCNS) photocatalyst with a thickness of 2.0 nm, pore volume of 0.61 cm3 g-1, and surface area of 190.1 m2 g-1 was prepared by a simple two-step template-free approach without the addition of extra reagents. Compared with the bulk g-C3N4 (BCN), PCNS possesses a greater number of surface reactive sites, improved efficiency of charge transfer, and accelerated separation of photogenerated electron-hole pairs. Accordingly, the visible-light-driven photocatalytic disinfection performance and Organic Pollutant degradation activity of PCNS are significantly enhanced. Escherichia coli (E. coli) cells can be killed completely by PCNS within 4 h, whereas only 77.1% of E. coli cells can be killed by BCN. The photodegradation rates of PCNS on methylene blue, Acid Red 27, and bisphenol A are almost 6.4, 4.0, and 1.9 times as fast as that of BCN, respectively. The photocurrent intensity of PCNS is about 3.7 times in comparison with that of BCN. Considering the easy preparation and excellent performance, PCNS could be a promising and competitive visible-light-driven photocatalyst in the field of environment remediation.
Ming Chun Lu - One of the best experts on this subject based on the ideXlab platform.
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Doping TiO2 with CuSO4 enhances visible light photocatalytic activity for Organic Pollutant degradation
Environmental Science and Pollution Research, 2019Co-Authors: Mark Daniel G De Luna, Yao Tung Lin, Chinee H. Mercado, Sergi Garcia-segura, Ming Chun LuAbstract:Photocatalysis is one of the most promising advanced oxidation processes due to the capability of solid catalyst to continuously produce oxidant species under light irradiation. The use of conventional UV lamps is high cost intensive, which undermines the possible implementation in developing countries. Visible light active photocatalysts can overcome these challenges and find a market opportunity for competitive technology implementation. This work proposes the synthesis of visible light active catalyst following a facile sol-gel synthesis that introduces CuSO4 as dopant in TiO2. Results present complete abatement of methylene blue in 120 min of treatment under 50 mW cm−2 of blue light (λ = 450 nm), while commercial P25 TiO2 presented null abatement under identical conditions. Synthesis parameters including dopant level and calcination temperature allowed defining optimum synthesis conditions based on material characteristics modification and catalytic activity enhancement. A doping level of 0.21 mol% CuSO4 was identified as optimum condition to enable visible light photocatalysis of doped TiO2 catalysts calcined at 300 °C. Finally, operational parameters were evaluated defining a wide range of pH operation under 3.0 g L−1 of catalyst dose to treat up to 20 g L−1 of highly recalcitrant phenothiazine dye. These optimum conditions allowed complete dye removal under visible light after 120 min of treatment.
Hynd Remita - One of the best experts on this subject based on the ideXlab platform.
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photocatalytic degradation of Organic Pollutant with polypyrrole nanostructures under uv and visible light
Applied Catalysis B-environmental, 2019Co-Authors: Xiaojiao Yuan, Dita Floresyona, Pierrehenri Aubert, Thanhtuân Bui, Samy Remita, Srabanti Ghosh, Francois Brisset, Fabrice Goubard, Hynd RemitaAbstract:Abstract Conjugated polymer nanostructures (CPNs) emerge as a new class of photocatalysts for Organic Pollutant degradation under UV and visible light. Polyprrole (PPy), as a conjugated polymer, exhibits a wide range of applications. We present here the first demonstration of employing pure PPy nanostructures as a very efficient photocatalyst for water depollution. PPy nanostructures were synthesized in hexagonal mesophases (used as soft templates) by chemical polymerization (PPy-NS-c), obtained by radiolysis (PPy-NS-γ), and synthesized without any template via chemical method (PPy-bulk) as bulk. The different PPy samples were characterized by SEM, TEM, FTIR and UV–vis absorption spectroscopy. The photocatalytic activity of both PPy nanostructures (PPy-NS-c and PPy-NS- γ), which remain very stable after several cycles, was evaluated for the degradation of Organic Pollutant in aqueous solution (phenol and methyl orange were taken as a model Pollutant). PPy nanostructures show high photocatalytic activity under both UV and visible light while bulk PPy (PPy-bulk) has no appreciable activity. PPy-NS-c present the highest activity for photodegradation of phenol under UV light, while PPy-NS-γ exhibit the best photocatalytic activity under visible light. We demonstrate here that the nanostructuration of these polymers is an important factor for their application in photocatalysis.
Y Hayakawa - One of the best experts on this subject based on the ideXlab platform.
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controlled structural and compositional characteristic of visible light active zno cuo photocatalyst for the degradation of Organic Pollutant
Applied Surface Science, 2017Co-Authors: S Harish, J Archana, M Sabarinathan, M Navaneethan, K D Nisha, S Ponnusamy, C Muthamizhchelvan, Hiroya Ikeda, D K Aswal, Y HayakawaAbstract:Abstract Degradation of Organic Pollutant using ZnO/CuO composites has become an attractive method for detoxification of water. The effect of copper acetate concentration and the functional properties of nanocomposites were investigated. The morphological analysis revealed that CuO nanoparticles dispersed uniformly on the surface of ZnO nanorods. X-ray photoelectron spectra analysis showed peak shift in the electronic states of Zn and Cu states. Elemental clearly confirms the presence of CuO were uniformly distributed on the surface of ZnO. The photocatalytic activity of ZnO/CuO composites was enhanced compared to pure ZnO under visible light irradiation. The optimal CuO content for the photocatalytic activity of the ZnO/CuO composites is 1%, which is almost ten times higher than that of pure ZnO. Owing to these synergic advantages, the degradation efficiency of ZnO/CuO composites reached 92.52% after 5 min of irradiation. The synergistic photocatalytic mechanism was proposed based on the photodegradation results.
Samy Remita - One of the best experts on this subject based on the ideXlab platform.
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photocatalytic degradation of Organic Pollutant with polypyrrole nanostructures under uv and visible light
Applied Catalysis B-environmental, 2019Co-Authors: Xiaojiao Yuan, Dita Floresyona, Pierrehenri Aubert, Thanhtuân Bui, Samy Remita, Srabanti Ghosh, Francois Brisset, Fabrice Goubard, Hynd RemitaAbstract:Abstract Conjugated polymer nanostructures (CPNs) emerge as a new class of photocatalysts for Organic Pollutant degradation under UV and visible light. Polyprrole (PPy), as a conjugated polymer, exhibits a wide range of applications. We present here the first demonstration of employing pure PPy nanostructures as a very efficient photocatalyst for water depollution. PPy nanostructures were synthesized in hexagonal mesophases (used as soft templates) by chemical polymerization (PPy-NS-c), obtained by radiolysis (PPy-NS-γ), and synthesized without any template via chemical method (PPy-bulk) as bulk. The different PPy samples were characterized by SEM, TEM, FTIR and UV–vis absorption spectroscopy. The photocatalytic activity of both PPy nanostructures (PPy-NS-c and PPy-NS- γ), which remain very stable after several cycles, was evaluated for the degradation of Organic Pollutant in aqueous solution (phenol and methyl orange were taken as a model Pollutant). PPy nanostructures show high photocatalytic activity under both UV and visible light while bulk PPy (PPy-bulk) has no appreciable activity. PPy-NS-c present the highest activity for photodegradation of phenol under UV light, while PPy-NS-γ exhibit the best photocatalytic activity under visible light. We demonstrate here that the nanostructuration of these polymers is an important factor for their application in photocatalysis.