TiO₂用量、pH值和温度对UV/US/TiO₂体系中活性艳红2脱色效果的影响。
Effects of TiO2 dosage, pH and temperature on decolorization of C.I. Reactive Red 2 in a UV/US/TiO2 system.
作者信息
Wu Chung-Hsin, Yu Chien-Hwa
机构信息
Department of Environmental Engineering, Da-Yeh University, 168, University Road, Dacun, Changhua, Taiwan, ROC.
出版信息
J Hazard Mater. 2009 Sep 30;169(1-3):1179-83. doi: 10.1016/j.jhazmat.2009.04.064. Epub 2009 Apr 24.
This study elucidates the decolorization of C.I. Reactive Red 2 (RR2) in ultrasound (US), US/TiO(2), ultraviolet (UV)/TiO(2) and UV/US/TiO(2) systems. The effects of TiO(2) dosage, pH and temperature on RR2 decolorization were determined in a UV/US/TiO(2) system. The pseudo-first-order decolorization rate constants of 0.5, 1 and 2g/l TiO(2) in the UV/US/TiO(2) system were 0.45, 0.57 and 0.94 h(-1), respectively. In the UV/US/TiO(2) system, the decolorization rate of RR2 declines as pH increases, and increases as temperature increasing. At pH 7, the decolorization rates followed the order of UV/US/TiO(2) (0.94 h(-1))>UV/TiO(2) (0.85h(-1))>US/TiO(2) (0.25 h(-1))>US. The activation energy of the UV/US/TiO(2) system at pHs of 4, 7 and 10 was 6.58, 11.62 and 21.32kJ/mol, respectively. Experimental results suggest that the RR2 decolorization in the UV/US/TiO(2) system was a diffusion-controlled reaction.
本研究阐述了在超声（US）、US/TiO₂、紫外（UV）/TiO₂ 以及 UV/US/TiO₂ 体系中，活性艳红 2（RR2）的脱色情况。在 UV/US/TiO₂ 体系中测定了 TiO₂ 用量、pH 值和温度对 RR2 脱色的影响。在 UV/US/TiO₂ 体系中，TiO₂ 浓度为 0.5、1 和 2g/L 时，RR2 的准一级脱色速率常数分别为 0.45、0.57 和 0.94 h⁻¹。在 UV/US/TiO₂ 体系中，RR2 的脱色率随 pH 值升高而下降，随温度升高而增加。在 pH 值为 7 时，脱色速率顺序为：UV/US/TiO₂（0.94 h⁻¹）＞UV/TiO₂（0.85 h⁻¹）＞US/TiO₂（0.25 h⁻¹）＞US。在 pH 值分别为 4、7 和 10 时，UV/US/TiO₂ 体系的活化能分别为 6.58、11.62 和 21.32kJ/mol。实验结果表明，UV/US/TiO₂ 体系中 RR2 的脱色是一个扩散控制反应。
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