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| Fe3O4@ZIF-8/CA电极制备及其对罗丹明B废水的降解研究 |
| The preparation of Fe3O4@ZIF-8/CA electrode for the degradation of RhB wastewater |
| 投稿时间：2020-03-24 修订日期：2020-04-17 |
| DOI： |
| 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（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6mA/cm2、负载量为200mg、催化剂焙烧温度为750℃，在最适条件下，罗丹明B的降解率在60min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6mA/cm2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84.14mg/L，同时在降解过程的溶液中检测到?OH，由此，对罗丹明的降解机理进行了初步探讨。 |
| 英文摘要: |
| Fe3O4@ZIF-8 catalyst and carbon aerogel electrode were prepared via hydrothermal method, and general material characterization methods including scanning electron microscope (SEM), transmission electron microscope (TEM) and N2 adsorption-desorption detection were carried out to detect the 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 RhB wastewater was investigated in different conditions. The result showed that the degradation rate of RhB could be up to 95.6% in 60 minutes with the pH of 7, current density of 6mA/cm2,catalyst loading being 200mg and catalyst calcination temperature at 750℃. Also, the electrode showed good stability after recycled three times with a degradation rate of 91%. Under the optimum degradation current density of 6 mA/cm2, it was found that the yield of hydrogen peroxide could reach 84.14 mg/L and hydroxyl radical was detected. So, the degradation mechanism of RhB was investigated. |
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