Fe3O4@ZIF-8/CA电极制备及其对罗丹明B废水降解研究  

Preparation of Fe3O4@ZIF-8/CA electrode for degradation of Rhodamine B wastewater

作　　者：李丽 张国权[1] 邢嘉钰 杨凤林[1] LI Li;ZHANG Guoquan;XING Jiayu;YANG Fenglin(Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China)

机构地区：[1]大连理工大学环境学院,工业生态与环境工程教育部重点实验室,辽宁大连116024

出　　处：《大连理工大学学报》2020年第4期365-373,共9页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(21437001)。

摘　　要：采用水热法制备出Fe3O4@ZIF-8核壳催化剂及碳气凝胶(CA)载体,通过扫描电镜(SEM)、透射电镜(TEM)、N2吸附-脱附曲线等方法对催化剂及载体的性能进行表征,测出材料的形貌、内部结构及比表面积.采用Fe3O4@ZIF-8/CA作为电芬顿体系阴极,碳棒作为阳极,探究不同条件下罗丹明B的降解效果.结果表明,降解罗丹明B废水的最适条件是pH为7、电流密度为6 mA·cm-2、催化剂负载量为200 mg、催化剂焙烧温度为750℃,在最适条件下,罗丹明B的降解率在60 min内即可达到95.6%.电极的稳定性测试实验表明,Fe3O4@ZIF-8/CA电极具有很好的稳定性,循环使用3次后,罗丹明B的降解率仍可达到91%.采用6 mA·cm-2的最佳降解电流密度对碳气凝胶的H2O2产量进行测定,发现最高产量可达到84.14 mg/L,同时在降解过程的溶液中检测到·OH,由此对罗丹明B的降解机理进行了初步探讨.Fe3O4@ZIF-8 core-shell catalyst and carbon aerogel support are prepared via hydrothermal method,and general material characterization methods including scanning electron microscope(SEM),transmission electron microscope(TEM)and N2 adsorption-desorption detection are adopted to detect morphology,internal structure and specific surface area of the materials.By using Fe3O4@ZIF-8/CA electrode as electro-Fenton cathode while carbon bar as anode,the degradation of Rhodamine B(RhB)wastewater is investigated under different conditions.The results show that the degradation rate of RhB can be up to 95.6%in 60 minutes with the pH of 7,current density of 6 mA·cm-2,catalyst loading being 200 mg and catalyst calcination temperature of 750℃.Also,the electrode shows good stability after being recycled three times with a degradation rate of 91%.Under the optimum degradation current density of 6 mA·cm-2,it is found that the yield of hydrogen peroxide can reach 84.14 mg/L and hydroxyl radical is detected.So,the degradation mechanism of RhB is discussed.

关 键 词：Fe3O4@ZIF-8材料 碳气凝胶 电芬顿 罗丹明B 

分 类 号：X52[环境科学与工程—环境工程] TB33[一般工业技术—材料科学与工程]