National and Provincial Joint Engineering Laboratory of Wetland Ecological Conservation, Heilongjiang Academy of Science , Harbin, 150040, People's Republic of China.
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology , Harbin, 150090, People's Republic of China.
Environ Sci Technol. 2018 Feb 6;52(3):1429-1434. doi: 10.1021/acs.est.7b04875. Epub 2018 Jan 24.
Iron silicate was synthesized and characterized as an efficient ozonation catalyst. Results indicated that iron silicate is a microporous material with poor crystallinity. Fe-O-Si and Fe-O bonds were observed on its surface. The Fe-O bonds belonged to α-FeO. Heterogeneous catalytic ozonation test was performed in batch reaction mode, and 4-chloronitrobenzene was used as model organic compounds. Amorphous iron silicate exhibited high catalytic activity, ozone utilization efficiency, and stability in catalytic ozonation. Hydroxyl radical was the dominant oxide species in this process. The reaction mechanism at the solid-water interface indicates that Fe-Si binary oxides on iron silicate surface inhibited ozone futile decomposition. This behavior resulted in enhanced probability of the reaction between ozone and α-FeO on the iron silicate surface to generate hydroxyl radicals, which promoted 4-chloronitrobenzene removal in aqueous solution.
合成并表征了铁硅酸盐作为一种高效的臭氧催化。结果表明，铁硅酸盐是一种结晶度差的微孔材料。在其表面观察到 Fe-O-Si 和 Fe-O 键。Fe-O 键属于α-FeO。在间歇反应模式下进行了非均相催化臭氧化实验，以 4-氯硝基苯作为模型有机化合物。无定形铁硅酸盐在催化臭氧化中表现出高催化活性、臭氧利用率和稳定性。在这个过程中，羟基自由基是主要的氧化物种类。固-水界面的反应机理表明，铁硅酸盐表面的 Fe-Si 二元氧化物抑制了臭氧的无效分解。这种行为增加了臭氧与铁硅酸盐表面上的α-FeO 之间反应生成羟基自由基的可能性，从而促进了水溶液中 4-氯硝基苯的去除。
