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| Factors Influencing Photocatalytic Degradation of Trichlorfon by TiO2 and ZnO |
| Received:April 15, 2015 |
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| KeyWord:TiO2;ZnO;photocatlytic reaction;degradation;trichlorfon |
| Author Name | Affiliation | E-mail | | LI Xue-yin | College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China | | | ZHU Li-jun | College of Science, Nanjing Forestry University, Nanjing 210037, China | lxyzlj@njfu.edu.cn | | ZHANG Hai-yang | College of Science, Nanjing Forestry University, Nanjing 210037, China | | | SHI Yan-jun | College of Science, Nanjing Forestry University, Nanjing 210037, China | | | CHEN Yan | College of Forest Resources and Environment, Nanjing Forestry University, Nanjing 210037, China | |
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| Abstract: |
| Photocatalytic degradation of pollutants has attracted increasing attentions recently. Due to their stability, wide band gap and high photosensitivity, photocatalysts TiO2 and ZnO have been widely applied in the degradation of various organic pollutants. In this research, TiO2 and ZnO were prepared by sol-gel and hydrothermal synthesis method. The band gaps of their nanoparticles were estimated by UV absorption spectra(UV-vis). Their crystalline phases were confirmed by X-ray diffraction(XRD) and Fourier infrared spectroscopy(FT-IR), and their morphology were observed by scanning electron microscopy(SEM). The photocatalytic degradation of trichlorfon was investigated under different initial trichlorfon concentrations, operating pH, photocatalyst rates, irradiation time and light sources. Results showed that the degradation rate of trichlorfon decreased with increasing initial concentrations of trichlorfon, but it increased with prolonging irradiation time while slowed down at longer time. Alkaline condition and mercury lamp irradiation both enhanced the degradation rates of trichlorfon. The maximal degradation rate occurred at a rate of 100~150 mg·L-1 of photocatalyst. Under ZnO, the increases in the degradation rate of trichlorfon were much higher at 0~100 mg·L-1 than at 100~200 mg·L-1. The photocatalytic degradation efficiency of ZnO was higher than that of TiO2 under the same conditions. |
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