| 李丽,张国权,邢嘉钰,杨凤林.Fe3O4@ZIF-8/CA电极制备及其对罗丹明B废水降解研究[J].,2020,60(4):365-373 |
| 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 |
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| DOI：10.7511/dllgxb202004005 |
| 中文关键词: Fe3O4@ZIF-8材料 碳气凝胶 电芬顿 罗丹明B |
| 英文关键词: Fe3O4@ZIF-8 material carbon aerogel electro-Fenton Rhodamine B |
| 基金项目:国家自然科学基金资助项目(21437001). |
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| 中文摘要: |
| 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． |
| 英文摘要: |
| 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. |
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