Li Laisheng, Zhu Wanpeng, Zhang Pengyi, Chen Zhongyin, Han Wenya
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Water Res. 2003 Sep;37(15):3646-51. doi: 10.1016/S0043-1354(03)00269-0.
The photocatalytic activity of the carbon-black-modified nano-TiO2) (CB-TiO2) thin films was 1.5 times higher than that of TiO2 thin films in degrading Reactive Brilliant Red X-3B. Photocatalytic oxidation and ozonation of catechol over CB-TiO2 thin films supported on Al sheet was investigated. The experiments showed that ozone concentrations had an important effect on TOC removal. The combined photocatalysis with UV irradiation and ozonation (TiO2/UV/O3) process considerably increased TOC removal rate compared to combined photocatalysis with UV irradiation and oxygen oxidation (TiO2/UV/O2) process, ozonation alone (O3) process, combined ozonation and UV irradiation (UV/O3) process. The complete mineralization of catechol followed pseudo-zero-order kinetics dependent upon ozone (oxygen) concentration and indicated catechol concentration did not affect the kinetics during UV/O3 and TiO2/UV/O3 (O2) processes. The kinetic study showed that the rate constants in the complete mineralization of catechol with TiO2/UV/O3 are 1.32-1.80 times higher than that of UV/O3 with the same concentration of ozone. The rate constants are 2.56-5.36 times higher than the maximal rate constants of TiO2/UV/O2 and 4.68-9.8 times higher than the maximal rate constants of TiO2/UV.
炭黑改性纳米二氧化钛（CB-TiO₂）薄膜在降解活性艳红X-3B方面的光催化活性比TiO₂薄膜高1.5倍。研究了铝板负载的CB-TiO₂薄膜上邻苯二酚的光催化氧化和臭氧化过程。实验表明，臭氧浓度对总有机碳（TOC）去除有重要影响。与光催化与紫外线照射和氧气氧化（TiO₂/UV/O₂）过程、单独臭氧化（O₃）过程、臭氧化与紫外线照射联合（UV/O₃）过程相比，光催化与紫外线照射和臭氧化联合（TiO₂/UV/O₃）过程显著提高了TOC去除率。邻苯二酚的完全矿化遵循依赖于臭氧（氧气）浓度的准零级动力学，表明在UV/O₃和TiO₂/UV/O₃（O₂）过程中邻苯二酚浓度不影响动力学。动力学研究表明，在相同臭氧浓度下，TiO₂/UV/O₃使邻苯二酚完全矿化的速率常数比UV/O₃高1.32 - 1.80倍。该速率常数比TiO₂/UV/O₂的最大速率常数高2.56 - 5.36倍，比TiO₂/UV的最大速率常数高4.68 - 9.8倍。
