Malachite green degradation by persulfate activation with CuFe2O4@biochar composite: Efficiency, stability and mechanism
Malachite green degradation by persulfate activation with CuFe2O4@biochar composite: Efficiency, stability and mechanism
复制标题
DOI：
10.1016/j.jece.2021.105800
复制
发表时间：
2021-06
影响因子：
7.7
通讯作者：
Quanlong Huang;Congjin Chen;Xilian Zhao;Xin-Ying Bu;Xiufen Liao;Hui Fan;Wenting Gao;Huayu Hu
中科院分区：
文献类型：
--
作者：
Quanlong Huang;Congjin Chen;Xilian Zhao;Xin-Ying Bu;Xiufen Liao;Hui Fan;Wenting Gao;Huayu Hu
如果染料废水直接排放到环境中，会对环境产生不利影响。因此，迫切需要开发一种有效的催化剂来激活过硫酸盐降解染料废水。采用溶胶-凝胶一步热解法合成了CuFe2O4@biochar复合材料（CuFe2O4@BC），并对活化PS降解孔雀石绿（MG）的效率、稳定性和机理进行了评价。结果表明，CuFe2O4@BC/PS体系对MG的降解效率为98.9%，表明在最佳条件下，CuFe2O4@BC的催化活性最好。各体系对MG的降解效率和TOC的去除率依次为CuFe2O4@BC/PS > CuFe2O4@BC/PMS > CuFe2O4@BC/H2O2。低浓度（< 10 mM）和高浓度（< 10 mM）的cl -表现出双重效应。CuFe2O4@BC在多次运行中表现出良好、稳定的催化性能。自由基猝灭实验表明，在CuFe2O4@BC/PS体系中，除表面吸附自由基外，O2•-对MG的降解也有促进作用，这为CuFe2O4@BC活化PS的机理提供了新的认识。分析了PS的活化机理和MG的两种可能降解途径。CuFe2O4@BC复合材料催化效率高，稳定性好，可重复使用，在活化PS处理mg污染废水方面具有很好的应用前景。
If dye wastewater discharges directly into the environment, it will make detrimental effects on the environment. Thus, it is urgently needed to develop an effective catalyst to activate persulfate for degrading dye wastewater. The CuFe2O4@biochar composite (CuFe2O4@BC) was synthesized by one-step sol-gel pyrolysis method and was evaluated for efficiency, stability and mechanism activating PS to degrade malachite green (MG). It was found that the degradation efficiency of MG in the CuFe2O4@BC/PS system was 98.9%, suggesting that CuFe2O4@BC exhibited the best catalytic activity among all the catalysts at optimum conditions. Furthermore, the MG degradation efficiency and TOC removal efficiency in the various systems followed an order: CuFe2O4@BC/PS > CuFe2O4@BC/PMS > CuFe2O4@BC/H2O2. Cl–at low (< 10 mM) and high (> 10 mM) concentrations exhibited dual effects. CuFe2O4@BC exhibited a favorable, stable catalytic performance in multiple runs. Free radical quenching experiments showed that O2•–was also contributed to MG degradation in the CuFe2O4@BC/PS system except the surface-adsorbed radicals, providing new insight into the mechanism of activation of PS by CuFe2O4@BC. The PS activation mechanism and the two possible degradation pathways of MG were analyzed. The CuFe2O4@BC composite with high catalytic efficiency and stability and reusability possesses promising prospects to activate PS for treating MG-contaminated wastewater.