碳修饰的铁基催化剂催化降解膜生物反应器出水中有机污染物

Organic pollutants degradation from MBR effluent catalyzed by carbon-decorated iron-based catalyst

采用水热法合成碳修饰的铁基催化剂,并利用非均相类Fenton反应对膜生物反应器(MBR)出水进行处理。研究表明,对催化剂进行碳修饰可以大幅提高类Fenton反应的催化活性,反应60 min对MBR出水COD的去除率可超过91%,且经过6次循环降解性能几乎保持不变。X射线光电子能谱(XPS)表明,反应后催化剂中高活性Fe^(2+)占比并未减少。循环伏安曲线表明,通过水热法进行碳修饰能有效提高催化剂电子传输效率并促进Fe^(2+)/Fe^(3+)循环。电子顺磁共振(EPR)测试表明,·OH和·O^(-)_(2)均是该体系中的活性氧物种。

Carbon-decorated iron-based catalyst was synthesized by hydrothermal method,and it was tested in the treatment of MBR effluent with heterogeneous Fenton-like reaction.The results showed that carbon modification on the catalyst could greatly improve the catalytic activity.The COD removal efficiency was more than 91%under the optimal conditions within 60 min,and the degradation performance remained almost unchanged after 6 cycles.XPS characterization showed that the proportion of highly active Fe^(2+)did not decrease after the reaction.The characterization by cyclic voltammetry showed that carbon modification in the catalyst by hydrothermal method could effectively improve the electron transport efficiency of the catalyst and accelerate the Fe^(2+)/Fe^(3+)cycle.EPR experiments showed that·OH and·O^(-)_(2)were the reactive oxygen species in this system.