Chen Zhong-Lin, Xu Zhen-Zhen, Ben Yue, Ye Miao-Miao, Ma Xin-Hong
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2007 Nov;28(11):2550-6.
Zinc hydroxide prepared in laboratory was used as catalyst in catalytic ozonation of trace p-chloronitrobenzene (pCNB) in water. The catalytic mechanism was deduced through the effect of radical inhibitor t-BuOH on the reaction. Furthermore, affecting factors of catalytic activity were investigated. Results show that zinc hydroxide has excellent property of catalytic ozonation. Compared to ozonation alone, the catalytic removal rate of pCNB dissolved in distilled water increases by 51.3 percents at reacting time of 20 min. The catalysis, which is influenced by density of hydroxyl groups combined on the surface of hydroxide, follows a hydroxyl radical reaction pathway. The removal gets better with increasing dosage of catalyst. Zinc hydroxide was used for 3 times without obvious changes of pCNB removal rate. Bicarbonate in water and phosphate in buffer solution could greatly depress its catalytic activity. The optimal catalysis is achieved at solution pH = 7.
实验室制备的氢氧化锌被用作水中痕量对氯硝基苯（pCNB）催化臭氧化反应的催化剂。通过自由基抑制剂叔丁醇（t-BuOH）对反应的影响推导了催化机理。此外，还研究了催化活性的影响因素。结果表明，氢氧化锌具有优异的催化臭氧化性能。与单独臭氧化相比，在反应20分钟时，溶解于蒸馏水中的pCNB的催化去除率提高了51.3%。该催化作用受氢氧化物表面结合的羟基密度影响，遵循羟基自由基反应途径。随着催化剂用量的增加，去除效果更好。氢氧化锌使用3次后，pCNB去除率无明显变化。水中的碳酸氢盐和缓冲溶液中的磷酸盐会大大降低其催化活性。在溶液pH = 7时可实现最佳催化效果。
