碳纳米管修饰泡沫镍空气扩散电极电-Fenton法降解水中对硝基酚

摘要

The nickel foam air diffusion electrode modified with carbon nanotube was prepared by deposition and calcinations process,and its surface appearance and redox properties were characterized by environmental scanning electron microscope(ESEM) and cyclic voltammetry(CV). Thecapabilities of the electrode on H2O2 generation andp-nitrophenol(p-NP) degradation were investigated. The characterization results indicate that:The modified electrode presents a hierarchical pore structure;A strong double electronic oxygen reduction peak appears at-0.6 V. The experimental results show that:When the current intensity is 150 mA and the reaction time is 120 min,the mass concentration of H2O2is 321.38 mg/L;In the electro-Fenton system with 0.1 mmol/L FeSO4,the p-NP removal rate can reach 95.90% after 30 min;Within 10 times of reuse,thep-NP removal rate on the electrode is 92%-96%.%采用涂覆焙烧法制备碳纳米管修饰泡沫镍空气扩散电极，并用环境扫描电子显微镜和循环伏安法对其表面形貌和氧化还原特性进行了表征。考察了该电极还原O2产生H2O2的性能及对水中对硝基酚的降解性能。表征结果表明：碳纳米管修饰泡沫镍空气扩散电极具有多级孔道结构；在-0.6 V处具有较强的氧双电子还原峰。实验结果表明：当电流为150 mA、反应时间为120 min时，产生的H2O2的质量浓度为321.38 mg/L；在外加0.1 mmol/L FeSO4形成的电-Fenton体系中，反应30 min后对硝基酚去除率可达95.90%；且该电极重复使用10次的对硝基酚去除率为92%~96%。