活性炭负载钴铁氧体催化PMS降解水中罗丹明B

采用化学共沉淀法制备了磁性活性炭负载钴铁氧体（CoFe2O4@AC），用于催化过硫酸氢钾（PMS）产生SO4-·自由基降解水中罗丹明B（RhB）。采用SEM、HR-TEM、XRD、FTIR、XPS等测试手段对CoFe2O4@AC的表面物理化学特性进行了表征，考察了PMS投加量、RhB浓度、pH、温度对降解RhB的影响。实验结果表明：与AC/PMS、CoFe2O4/PMS相比，CoFe2O4@AC/PMS催化体系对RhB具有更高的降解效率，且适用于较宽的pH范围（pH=5.0~9.0）；CoFe2O4@AC/PMS体系对RhB的降解随温度的升高而显著加快，其降解活化能为67.46 kJ·mol-1。降解机理研究结果表明，复合材料中的AC和Co(II)协同参与了催化PMS产生·OH和SO4-·的过程。总之，磁性CoFe2O4@AC不仅具有高效的催化效果而且易于从水中分离，对有机染料废水的处理有着良好的前景。

Degradation of rhodamine B in aqueous solution by PMS activated with activated carbon loaded with Co-Fe ferrite

A magnetic activated carbon coating Co-Fe ferrite (CoFe2O4@AC) was synthesized through coprecipitation method and used to activate peroxymonosulfate(PMS) to generate sulfate radicals (SO4-·) for the degradation of rhodamine B (RhB). The physico-chemical properties of the composite was characterized using SEM, HR-TEM, XRD, FTIR, XPS analyses. Effects of PMS dosage, RhB concentration, initial pH and temperature on RhB degradation were discussed systematically. Experiments results showed that CoFe2O4@AC/PMS system exhibited a higher degradation efficiency for RhB than AC/PMS and CoFe2O4/PMS systems, and adapted to a wide solution pH range from 5.0 to 9.0. The degradation rate of RhB increased rapidly with increasing temperature, and the activation energy was calculated to be 67.46 kJ·mol-1. Mechanism study indicated that both the AC and Co(II) in the composite participated in activating PMS to produce ·OH and SO4-· radicals. In a word, the novel catalyst have a bright prospects in dyes treatment not only because of its efficient catalytic effect but also the characteristic of easily separated from water.