State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China E-mail:
Water Sci Technol. 2013;68(8):1895-900. doi: 10.2166/wst.2013.449.
The catalytic ozonation of p-chloronitrobenzene (pCNB) in an aqueous solution using pumice-supported zinc oxyhydroxide (ZMP) as the catalyst was investigated. ZMP significantly enhanced the degradation efficiency in the heterogeneous catalytic ozonation compared with ozonation alone. The decomposition rate of the aqueous ozone increased 2.84-fold in the presence of ZMP. Catalytic ozone decomposition showed that pCNB is oxidized primarily by hydroxyl radicals (•OH) in ozonation/ZMP processes. This modification increases the density of surface hydroxyl groups as well as the pH at the point of zero charge (pHPZC) of pumice, resulting in the appearance of new ZnO and Zn(OH)2 crystalline phases. An investigation of the underlying mechanism confirms that ZnOOH loading promotes •OH initiation, which enhances the degradation of pCNB.
使用浮石负载的氧化锌（ZMP）作为催化剂，研究了水溶液中对氯硝基苯（pCNB）的催化臭氧化反应。与单独臭氧化相比，ZMP 显著提高了非均相催化臭氧化的降解效率。在 ZMP 的存在下，水相臭氧的分解速率增加了 2.84 倍。催化臭氧分解表明，在臭氧化/ZMP 过程中，pCNB 主要通过羟基自由基（•OH）被氧化。这种修饰增加了表面羟基的密度以及浮石零电荷点（pHPZC）的 pH 值，导致出现新的 ZnO 和 Zn(OH)2 结晶相。对潜在机制的研究证实，ZnOOH 负载促进了•OH 的引发，从而增强了 pCNB 的降解。
