Papers by Keyword: Photocatalyst

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Authors: Li Ya Wang, Qing Li, Xiu Kai Li
Abstract: Bi5AgM4O18 (M=Nb and Ta) photocatalysts with 3.07-3.55eV of band gaps and layered perovskite-like structures showed activities for 2-propanol degradation in gas phase. Due to the appropriate crystal structure and energy band structure, Bi5AgNb4O18 performed much better than Bi5AgTa4O18 for 2-propanol photodegradation.
Authors: Wen Dong Liang, Xian Kun Wang, Yong Ping Yang
Abstract: Anatase TiO2 thin films were prepared on glass substrates by dip-coating method with TiCl4 as the Ti precursor hydrolysis in a mixed solvent of alcohol and water. The effects of preparation parameters such as the alcohol species, the alcohol/water (A/W) ratio, and the dosage of TiCl4 (the volume ratio of TiCl4 and mixed solution) were investigated. The best preparation condition was optimized that with the isopropanol / H2O volume ratio of 65:35, the dosage of TiCl4 at 3%. XRD, SEM, TEM and UV–Vis photospectroscopy were used to analyze the characteristics of the solution and films. The films have a high hydrophilicity after illuminating with ultraviolet light, it have a good adherence and can be used as an efficient photocatalyst.
Authors: Shi De Wu, You Qi Zhu, Chao Li, Ying Liang Wei
Abstract: A novel CuO-TiO2 composite photocatalyst was prepared by a redox process coupling with sol-gel method. The morphology and structure of the as-prepared samples were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Photocatalytic activity of the CuO-TiO2 composite photocatalyst was evaluated in terms of the degradation of Methyl orange (MO) in aqueous solution under UV light irradiation. The results show that the as-prepared composite consisted of monoclinic-phase CuO-nanotubes and TiO2 nanoparticles, in which TiO2 nanoparticles were dramatically decorated on the CuO-nanotubes, exhibits a high catalytic activity to decolorize MO. According to the experimental results, 1.27wt % was the optimal loading for CuO-doped TiO2 photocatalyst.
Authors: Mao Lin Zhang, Long Feng Li
Abstract: A nanometer coupled oxide ZnO-SnO2 was prepared by the fractional homogeneous co-precipitation route using urea as the latent precipitant under boiling reflux condition. The samples prepared from different initial concentrations of urea or at different calcination temperatures were characterized by X-ray diffration (XRD) or transmission electron microscopy (TEM). It was found that the coupled oxides ZnO-SnO2 mainly consist of nanosized ZnO and SnO2, the calcination temperature had obvious effect on the phase composition and the crystal size of the samples obtained, and the precipitant concentration also had obvious effect on the oxide particles size and the production rate of ZnO. Moreover, their photocatalytic activity was investigated for the liquids-phase photocatalytic degradation of methyl orange (MO) in water under UV light irradiation.The coupled oxides showed better photocatalytic activity for the degradation of MO than the pure ZnO or SnO2.
Authors: Ruzinah Isha, Nurul Hariyah Abd Majid
Abstract: Titanium dioxide (TiO2) is excellently used in various applications including wastewater treatment. It is known to have superb pigmentary properties, high adsorption in the ultraviolet (UV) region, and high stability. The objective of this paper is to study the effect of contact time of seawater desalination in the photocatalytic reaction. The hybrid TiO2 catalysts; a mixture of TiO2 and biomass ash, was synthesized via wet impregnation and calcined at 800 °C. The photocatalyst was then characterized by using Scanning Electron Microscopy (SEM) and Braunauer-Emmett-Teller (BET). The investigation was carried out in a photoreactor equipped with UV light operated for up to six hours with catalyst to seawater weight ratio of 1:400 and stirring speed of 600 rpm. The salt concentration, turbidity and pH of the water were determined prior and after the investigation. The result indicates that the salt concentration gradually decreased more than 25% as the contact time increased up to six hours. However, there is no significant change on pH value of the water. It can be concluded that the hybrid TiO2 is able to reduce the seawater salinity effectively.
Authors: Zhen Peng, Li Zhang, Chun Sheng Wang, Ke Fu Yao
Abstract: It is well-known that TiO2 is an environmental benign photocatalyst which can be used to decompose harmful organic compounds. Recently, many studies are concentrated on the purification of industrial wastewater due to the requirement of environmental protection. In present study, TiO2 nanomaterials supported by fine zeolite particles have been used as the photocatalyst to purify the oily wastewater. It has been found that the oil concentration in the modulated water can be reduced significantly and rapidly under the action of photocatalytic degradation and the ultraviolet light radiation. After 80 minutes, oil concentration in the modulated water can be reduced by more than 80%. The results suggest that TiO2 nanomaterials supported by fine zeolite particles are effective material for purification of oily wastewater. In addition, the present results show that the efficiency of water purification can be significantly increased by use of mechanical stirring during the photocatalytic degradation process.
Authors: Abdul Rajak, Muhammad Miftahul Munir, Muhammad Sainal Abidin, Khairurrijal
Abstract: The degradation of pollutants in a waste water with the aid of light as an energy source enabler is one of the photocatalysis processes. Because a textile dye dissolved in water is often used to model the waste water, the degradation of color becomes a major variable to indicate the water clarity after the photocatalysis process occured. Therefore, a sensitive instrument to measure the degradation of color is required. This paper reports a simple spectrometer using a photodiode sensor OPT101 and a light emitting diode (LED). The light emitted by the LED passes through the waste water so that its intensity is reduced. Then, the photodiode sensor receives the light with reduced intensity. In order to test the spectrometer performance, a waste water model was prepared by employing a textile dye in water with various concentrations. Curves showing the relationships between concentration and voltage output of the sensor were obtained for different colors of LEDs (white, blue, orange, red and yellow). A microcontroller is used to process the voltage output of the sensor and an LCD then displays the concentration. The results shows that red LEDs has a smallest error with an error of less than 5%.
Authors: Ying Cao Xu, Hong You
Abstract: A statistical experimental design to the degradation of aqueous methyl orange, by using the Ti/TiO2 nanotube array photocatalyst, under UV irradiation, was investigated. Concentration of methyl orange(5mg/L,15mg/L,25mg/L), catalytic time (0.5h,1h,1.5h) and UV light source (6w,11w,15w) were selected as major operating variables. To investigate the effects of variables to degradation rate, the statistical experiment of Box-Behnken design(BBD) and Response Surface methodology(RSM) was employed. Regression analysis showed that the experiment data accorded with the predicted values obtained from quadratic regression equation in BBD with R-Squared of 0.9806 and F-value of 39.34.
Authors: Xue Li Xu, Wei Song, Li Zhang
Abstract: In the experiment a new photocatalyst AgBr/TiO2 was prepared by modifying TiO2 and was applied to degrade the organophosphorous pesticide wastewater . Some factors influencing the degradation were discussed. The results showed that the AgBr/TiO2 had higher photocatalytic activity; when the quality of photocatalyst was 1.2g, the initial concentration of the organophosphorous pesticide wastewater was 100mg/L, the PH was 11 and the degradation time was 100 minutes,the treatment effect of photocatalytic degradating organophosphorous pesticide wastewater was the best.
Authors: Jing Xin Li, Yan Cheng Peng, Xin Zhang
Abstract: The toluene being abatement by non-thermal plasma combined with photocatalyst was studied in the paper. As one of main factors, the influence on toluene abatement efficiency of gas flow rate, initial concentration and electric field intensity was analyzed in the study. Furthermore, the energy efficiency was another important index which had been compared among the different padding including of no padding, γ-Al2O3 padding and TiO2/γ-Al2O3 padding. The result of study showed that the technology of non-thermal plasma combined with photocatalyst had better buffer action against increasing of gas flow rate and initial concentration. When the abatement efficiency was more than 52%, the energy efficiency values had the tendency as TiO2/γ-Al2O3 >γ-Al2O3 padding > no padding.
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