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《Chinese Journal of Catalysis》 2003-03
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Photocatalytic Ozonation of Catechol by Titania Thin Film

LI Laisheng *, ZHU Wanpeng, ZHANG Pengyi, CHEN Zhongying, CHEN Le(Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China)  
The combination of a nano-TiO_2 thin film modified by carbon black and photocatalytic ozonation has been investigated for the degradation of catechol. The results show that the ozone concentration has an significant effect on total organic carbon (TOC) removal of catechol. The combined photocatalysis of UV irradiation and ozonation (TiO_2/UV/O_3) considerably increases TOC removal compared with the combined photocatalysis of UV irradiation and oxygen oxidation (TiO_2/UV/O_2), ozonation alone (O_3), and the combined process of UV irradiation and ozonation (UV/O_3). For example, the TOC removal rate after 30 min of reaction in the TiO_2/UV/O_3 process with the same ozone concentration is 55.2%~62.6% higher than that in the O_3 process and 18.0%~34.6% higher than that in the UV/O_3 process when the ozone flow rate is over 25.0 mg/h. The removal rate is 58.8%~68.8% higher than that in the TiO_2/UV/O_2 process. The kinetic study shows that the complete mineralization of catechol follows pseudo-zero-order kinetics in which the TOC removal depents on ozone (oxygen) concentration and the catechol concentration does not affect the kinetics in the UV/O_3 (O_2) and TiO_2/UV/O_3 (O_2) processes. These results also indicate that the indirect reaction of ozone may play a dominant role for the complete mineralization of catechol. The rate constants in the complete mineralization of catechol in the TiO_2/UV/O_3 process are 1.32~1.80 times higher than that in the UV/O_3 process with the same concentration of ozone, 2.56~5.36 times higher than the maximum rate constants in the TiO_2/UV/O_2 process and 5.47~11.4 times higher than the maximum rate constants in the UV/O_2 process.
【Fund】: 北京市节水办公室和清华大学校基金资助项目
【CateGory Index】: O643.3
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