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.
作者
李丽
张国权
邢嘉钰
杨凤林
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)
出处
《大连理工大学学报》
EI
CAS
CSCD
北大核心
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)。
