Comparative study of electro‐Fenton and photoelectro‐Fenton processes using a novel photocatalytic fuel cell electro‐Fenton system with g‐C3N4@N‐TiO2 and Ag/CNT@CF as electrodes

光催化 罗丹明B 阴极 阳极 微生物燃料电池 反应速率常数 化学 矿化(土壤科学) 电极 分析化学(期刊) 催化作用 降级(电信) 动力学 化学工程 材料科学 核化学 物理化学 环境化学 有机化学 电气工程 物理 工程类 量子力学 生物化学 氮气
作者
Boya Ma,Jinying Li,Chunwei Yang,Dong Wang
出处
期刊:Water Environment Research [Wiley]
卷期号:96 (1) 被引量:1
标识
DOI:10.1002/wer.10946
摘要

Abstract In this study, a novel photocatalytic fuel cell electro‐Fenton (PFC‐EF) system was constructed using g‐C 3 N 4 @N‐TNA and Ag/CNT@CF as electrodes. The composition, structure, and morphology of the electrodes were obtained. The g‐C 3 N 4 @N‐TNA, with its 2.37 eV band gap and 100 mV photovoltage, has excellent excitation properties for sunlight. Ag/CNT@CF with abundant pores, CNT 3D nanostructures, and Ag crystals on the surface can improve the electro‐Fenton efficiency. A comparative study of rhodamine B (RhB) degradation was performed in this system. It has been shown that electric fields can greatly enhance the oxidation efficiency of both anode photocatalysis and the cathode electro‐Fenton process. Under optimal conditions, RhB can be completely removed by the photoelectro‐Fenton (PEF) process. The energy consumption of the PEF system was obtained. The electrical energy per order (EE/O) is only 9.2 kWh/m 3 ·order, which is only 16.5% of EF and 2.2% of PFC‐EF system. The mineralization current efficiency (MCE) of the PEF system reached 93.3% for a 2‐h reaction. Therefore, the PEF system has the advantage of saving energy. The kinetic analysis shows that the RhB removal follows a first‐order kinetic law, and the reaction rate constant reaches 0.1304 min −1 , which is approximately 5.2 times larger and 4.0 times larger than the electro‐Fenton and PFC‐EF processes, respectively. RhB removal is a coupling multimechanism in which an electric field enhances photoelectron migration, Ag loading improves H 2 O 2 generation, UV light coupled with H 2 O 2 promotes hydroxyl radical (٠OH) generation, and the nanoconfinement effect of CNTs promotes ٠OH accumulation in favor of RhB degradation. Practitioner Points Novel efficiency photocatalytic fuel cell electro‐Fenton system was constructed. The electric field greatly enhances the photocatalytic fuel cell electro‐Fenton system. Multiple coupling mechanisms of UV/H2O2, UV/Fenton and photo‐electro‐Fenton have been revealed.
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