CuFe_(2)O_(4)/硅藻土复合材料活化过一硫酸盐降解酸性橙  

CuFe_(2)O_(4)/diatomite composite activated peroxymonosulfate for degradation of acid orange 7

作　　者：陈锦富 严群[1,3] 龚鹏程 张理军 温俊宇 苏晓洁 CHEN Jinfu;YAN Qun;GONG Pengcheng;ZHANG Lijun;WEN Junyu;SU Xiaojie(School of Civil and Surveying&Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Innovation Center for Water Quality Security Technology at Ganjiang River Basin,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000 [2]江西理工大学资源与环境工程学院,江西赣州341000 [3]江西理工大学,赣州市赣江流域水质安全保障技术创新中心,江西赣州341000

出　　处：《精细化工》2023年第9期2042-2051,共10页Fine Chemicals

基　　金：国家科技支撑计划项目(2012BAC11B07);江西省科技厅自然科学基金资助项目(20122BAB203027)。

摘　　要：通过柠檬酸辅助溶胶-凝胶法制备了一种磁性复合材料CuFe_(2)O_(4)/硅藻土(CFD)。通过SEM、XRD、FTIR、XPS表征了其微观形貌结构和元素价态,考察了不同氧化体系、CFD质量浓度、过一硫酸盐(PMS)质量浓度、溶液初始pH、反应温度、阴离子种类对CFD降解酸性橙7(AO7)的影响,探讨了CFD降解AO7的机制。结果表明,CFD上的球形颗粒CuFe_(2)O_(4)能够分散地负载在硅藻土表面上,减少了CuFe_(2)O_(4)的团聚,且CFD上的表面羟基及Fe^(3+)/Fe^(2+)、Cu^(2+)/Cu^(+)/之间的价态循环参与了PMS的活化。在CFD质量浓度为0.50 g/L、溶液初始pH为6.68、PMS质量浓度为0.30 g/L、AO7质量浓度为50 mg/L、反应温度为30℃的条件下,60 min时100 mL该体系对AO7的降解率为96.88%,CFD+PMS体系降解AO7过程符合准一级动力学模型,其对AO7的降解速率常数比CuFe_(2)O_(4)+PMS体系提升了1.98倍。CFD+PMS体系具有较广的pH适用范围(5~11)和较低的活化能(31.77 kJ/mol)。降解过程的主要活性物质为单线态氧(^(1)O_(2))和·O_(2)^(–),同时也有SO_(4)^(–)·、·OH产生。Magnetic composite CuFe_(2)O_(4)/diatomite(CFD)was prepared via citric acid assisted sol-gel method,and then characterized by SEM,XRD,FTIR and XPS for analysis on its microstructure and elemental valence.The effects of different oxidation systems,mass concentration of CFD,mass concentration of peroxymonosulfate(PMS),initial pH of solution,reaction temperature and anion type on the degradation of acid orange 7(AO7)by CFD system were investigated,and the AO7 degradation mechanism by CFD was explored as well.Results from characterization indicated that the spherical CuFe_(2)O_(4)particles were dispersed on the surface of diatomite,which reduced the agglomeration of CuFe_(2)O_(4),while the valence cycles among the surface hydroxyl group,Fe^(3+)/Fe^(2+)and Cu^(2+)/Cu^(+) on CFD were involved in the PMS activation.Under the optimal conditions of 0.50 g/L mass concentration of CFD,initial pH of solution 6.68,mass concentration of PMS 0.30 g/L,mass concentration of AO750 mg/L and reaction temperature 30℃,the degradation rate of AO7 in 100 mL of the system reached 96.88%at 60 min.The degradation process of AO7 in CFD+PMS system was in line with the pseudo-first-order kinetic model,and the AO7 degradation rate constant was 1.98 times higher than that in pure CuFe_(2)O_(4)+PMS system.The CFD+PMS system,with a low activation energy(31.77 kJ/mol),could be applied in a wide pH range(5~11).The main active substances in the degradation process were singlet oxygen(^(1)O_(2))and•O_(2)^(–),while SO_(4)^(–)•and•OH were also produced.

关 键 词：高级氧化 CuFe_(2)O_(4) 硅藻土 过一硫酸盐 酸性橙7 水处理技术 

分 类 号：X703[环境科学与工程—环境工程]