Heterogeneous Fenton degradation of p-nitrophenol by iron complexing carboxyl-modified carbon nanotube
1. Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Jilin Normal University, Siping, Jilin 136000, China; 2. College of Environmental Science and Engineering, Jilin Normal University, Siping, Jilin 136000, China; 3. College of Information and Technology, Jilin Normal University, Siping, Jilin 136000, China
Abstract：To solve the problem of catalyst deactivation by iron ion complexing with the intermediates from Fenton degradation of phenol compounds, the synthetic method of heterogeneous Fenton catalysts with carboxyl complexation was proposed. The structure and the composition of the iron complexing carboxyl-modified carbon nanotube (CNT-COOFe) were characterized by FTIR, XRD and XPS. The CNT-COOFe was deposited on PTFE filter membrane by vacuum suction method to form catalyst layer. The catalytic performance and regeneration were studied in the heterogeneous Fenton system with p-nitrophenol as model pollutant. The results show that the conversion rate of H2O2 is decreased with the extension of reaction time, and the conversion rates at 2 and 30 min are respective 90.23% and 19.54% when 30 mg·L-1 H2O2 with initial pH value of 5.0 is flowed through the membrane layer of 30 mg CNT-COOFe. The existence of hydroxyl free radicals is confirmed as the main reactive radical by capturing experiment with coumarin.The p-nitrophenol with initial concentration of 10 mg·L-1 is degraded rapidly in the heterogeneous Fenton system, and the removal rates of p-nitrophenol and TOC at 2 min are near 100% and 80%, respectively. The catalytic activity of CNT-COOFe can be regenerated by electroreduction at the cathode potential of -1.0 V vs. Ag/AgCl, and the TOC removal rate of the system can still reach about 80%.
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2020, Vol. 41 
