催化作用
化学
吸附
激进的
羟基自由基
分解
降级(电信)
X射线光电子能谱
无机化学
邻苯二甲酸盐
化学工程
有机化学
计算机科学
电信
工程类
作者
Yueming Ren,Qing Dong,Jing Feng,Jun Ma,Qing Wen,Milin Zhang
标识
DOI:10.1016/j.jcis.2012.05.053
摘要
Magnetic porous ferrospinel NiFe(2)O(4) prepared by a sol-gel method is introduced as a novel catalyst in the ozonation of refractory di-n-butyl phthalate (DBP), which is scarcely adsorbed on the catalyst surface under the investigated conditions in water. Such ferrospinel showed remarkable and stable catalytic ozonation acceleration on the degradation of DBP compared with the case of ozonation alone at pH 7.7. The catalytic ozonation process was pH dependent, and an uncharged surface was more active than a charged surface. The results revealed that NiFe(2)O(4) catalytic ozonation followed a radical-type mechanism. The experiment related to the influence of phosphate and FTIR results showed that the surface hydroxyl groups acted as the main active sites in promoting hydroxyl radical ((*)OH) generation. Concerning these finds and XPS results, we proposed that Ni(2+) transferred electron from the surface to induce ozone decomposition in the catalytic process, the oxidation of lattice oxygen played an essential role in enhancing the reversion of Ni(3+) to Ni(2+), and the promotion of (*)OH reaction was a combined balance action of Ni(2+)/Ni(3+) and O(2-)/O(2).
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