Papers by Keyword: Photocatalytic Performance

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Authors: Zheng Hua Xiao, Tao Wang
Abstract: Nanostructured SnO2 was prepared by a parallel flow method under ultrasonic vibration. The photocatalytic performance of SnO2 was investigated by utilizing photocatalytic decolorization of methyl orange used as model organic pollutant. SnO2 prepared was characterized by BET, XRD and SEM. The results show that ultrasonication can influence greatly the specific surface parameters, SEM image and particle size, thus leading to better photocatalytic performance. The photocatalytic performance of SnO2 prepared by ultrasonication is 1.5 times of that of SnO2 prepared without ultrasonication.
2151
Authors: Xiao Fei Qu, Jing Jun Yuan, Xi Da Deng, Yu Chen Hou, Yu Fei Wang, Hong Bing Song
Abstract: In this paper, a simple, efficient and environmental friendly method was proposed to fabricate TiO2/CdS nanotube arrays. The composite nanotubes with a core-shell coaxial structure were fabricated via a simple method of liquid deposition and double diffusion using anodic aluminum oxide (AAO) templates. The photocatalytic properties of the nanotube arrays (TiO2, TiO2/CdS) were confirmed by the degradation of methyl orange (MO) under UV irradiation. Compared to bare TiO2 nanotube arrays, TiO2/CdS composite nanotube arrays showed improved photocatalytic performance: The degradation efficiency of TiO2/CdS and TiO2 nanotube arrays towards methyl orange was 65% and 39%, respectively.
374
Authors: Jing Jing Xie, Hui Zeng, Meng Hu Wang, Shao He Xie, Zheng Yi Fu
Abstract: Nature is a perfect designer in fabricating biomaterials with well-defined and hierarchical nanostructures. Here we report a biomineralization-inspired approach for preparing hierarchical ZnO structure with high UV-light efficiency. The results show that biomacromolecules play an important role on controlling growth and assembly of ZnO nanostructures. It is found that the biomacromolecules favoring the isotropic growth of ZnO at the high concentration.
397
Authors: Chii Rong Yang, Tun Ping Teng, Yun Yu Yeh
Abstract: In this study, we successfully combined RF magnetron sputtering of a pure Ti metal target and one-stage oxidation process with a wider oxygen ratio (10%-90%) and total sputtering flow rate (16-24 sccm) to produce TiO2 thin films on a glass substrate. The crystallization, morphology, roughness, and thickness of the thin films were examined using XRD, HR-FESEM, AFM, and a profilometer. Subsequently, the photocatalytic performance was examined using a spectrometer and video tensiometer. The experimental results show that the TiO2 thin films with a majority of anatase and higher roughness exhibit superior photocatalytic performance; the total sputtering gas flow rate of 18 sccm and oxygen content at 10% is the optimal option. Finally, an empirical formula to correlate the film thickness with deposition time was conducted for the sputtering flow rate of 18 sccm and the oxygen content of 10%.
9
Authors: Zhan Kui Cui, Li Wei Mi, Zhi Zheng, Guang Hui Wang, Wen Jun Fa
Abstract: BiOCl nanosheets were annealed at different temperatures. The effect of annealing on structures and properties was characterized by X-ray diffraction (XRD), N2 adsorption-desorption, UV-visible diffuse reflectance spectroscopy (DRS) and photoluminescence spectroscopy (PL). The photocatalytic performance was evaluated by photodegrading Rhodamine B (RhB) under UV light irradiation. It was found oxygen vacancy defects (OVDs) could be generated during the annealing treatment and the best photocatalytic efficiency was obtained when the annealing temperature was 450 °C. The enhanced photocatalytic efficiency was ascribed to the high separation efficiency of the photogenerated electron-hole pairs due to the existence of the OVDs as positively charged centers.
646
Authors: Shu Huei Hsieh, Yu En Lee, Wen Jauh Chen
Abstract: In this study, the hydrothermal method was used for synthesizing ZnSe/graphene nanocomposites with the amount of graphene oxide (GO) and hydrazine. Obtained ZnSe/graphene photocatalysts were characterized by X-ray diffraction analysis (XRD) and transmission electron microscope (TEM). Photocatalytic activity under visible light is evaluated in methylene blue (MB) dye degradation reaction in aqueous phase. The results show that the amount of graphene oxide (GO) and hydrazine have an effect on the degradation efficiency of the ZnSe/graphene nanocomposite. When GO/ZnSe ratio was 1. The optimum degradation efficiency of the ZnSe/graphene nanocomposites prepared with 5 mL of N2H4 was 99.6% after 5h of visible light irradiation.
127
Authors: Jun Ichi Hamagami, Takashi Nakajima, Kiyoshi Kanamura, Takao Umegaki
53
Authors: Sheng Tian Huang, Zheng Hua Xiao, Jian Zhang Li, Jun Bo Zhong, Wei Hu, Jin Jin He
Abstract: In this paper, SnO2 and Fe2O3 doped-SnO2 photocatalysts with different molar ratio of Fe/Sn were synthesized by a parallel flow coprecipitation method. The photocatalysts prepared were characterized by Brunauer-Emmett-Teller (BET) method, X-ray diffraction (XRD) and UV/Vis diffuse reflectance, respectively. The photocatalytic activity of photocatalysts prepared toward decolorization of methyl orange (MO) solution was evaluated. Of all of the photocatalysts prepared among the experimented compositions, Fe2O3 doped-SnO2 with 1.5%Fe possesses the best photocatalytic activity.
2278
Authors: Khatcharin Wetchakun, Natda Wetchakun, Sukon Phanichphant
Abstract: Pure TiO2 nanoparticles were synthesized by the modified sol-gel method using titanium tetraisopropoxide (TTIP) precursor dissolved in absolute ethanol. A pouch type cellophane membrane was employed as barrier between the precursor solution and the mixture of absolute ethanol (1:1 v/v) and distilled water with 0.5-1.0 % concentrated of ammonia in order to fix the reaction activity inside the pouch and control diffusion rate of hydrolysis and condensation reaction. The doping of TiO2 nanoparticles with 0.1, 0.2, 0.5, 1.0 and 2.0 at.% Ru was performed by the impregnation method using ruthenium acetyl acetonate in toluene as dopant. The properties of the all samples were characterized by X-ray diffraction (XRD), Brunauer, Emmett and Teller (BET)-specific surface area, Scanning electron microscopy-Energy dispersive spectroscopy (SEM-EDS) and transmission electron microscopy (TEM). The crystalline size of pure TiO2 and Ru-doped TiO2 nanopaticles were found to be in the range of 10-20 nm. The photocatalytic mineralization of formic acid, oxalic acid, sucrose and glucose was investigated using Degussa P25, pure TiO2 and Ru-doped TiO2 nanoparticles as photocatalysts in aqueous solutions under UVA irradiation. The rate of 50% mineralization of formic acid by 0.1 at.% Ru-doped TiO2 was 1.53 times and 1.34 times higher than that of pure TiO2 and Degussa P25, respectively showing the enhancement of the photocatalytic performance of TiO2 by doping with an optimum amount of ruthenium.
853
Authors: Yan Lu, Jun Bo Zhong, Jian Zhang Li, Wei Hu
Abstract: It has been found that the photocatalytic activity of Bi2O3 toward the decolorization of Methyl Orange solution can be greatly improved by loading Ag on the surface of Bi2O3 using a photodeposition method. The photocatalysts were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy and surface photovoltage spectroscopy (SPS), respectively. 0.5%Ag/Bi2O3 possesses the best photocatalytic activity.
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