Electrochemical fabrication of polyaniline films deposited on graphene-loaded electrodes for •OH production and perfluorooctanoic acid degradation

聚苯胺 石墨烯 催化作用 石墨 化学工程 电化学 电催化剂 材料科学 核化学 电解质 无机化学 电极 化学 纳米技术 有机化学 聚合物 冶金 聚合 工程类 物理化学
作者
Fangke Yu,Yang Yang,Yanfang Zhang,Yuwei Pan,Ying Zhang
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:450: 137914-137914 被引量:4
标识
DOI:10.1016/j.cej.2022.137914
摘要

• The rapid method of electro-deposition was used to load PANI on GF. • It overcomes the secondary pollution coming from traditional EF. • Graphite N was the active catalytic site for the production of H2O2. • Pyrrolic-N enhanced the PFOA adsorption capacity of the cathode. The present study describes the coating of modified graphite felt (GF) with graphene (GE) and polyaniline (PANI). GF was doped with nitrogen atoms by a series of modification and electrolytic deposition . Tests of different types of N content and cathodic catalytic oxidation performance confirmed that the graphite N introduction promoted the production of H 2 O 2 in the 2e - process. Pyridine N catalyzed the H 2 O 2 decomposition to produce •OH. The amount of H 2 O 2 produced by GF, GF-GE, and GF-GE@PANI system was 11 mg L -1 , 70 mg L -1 , and 180 mg L -1 , respectively. The doping of graphene increased H 2 O 2 yield, and the electrolytic deposition of PANI converted H 2 O 2 to •OH rapidly. It was proved that the N atom provided by graphene was graphite N, which was the active catalytic site for the production of H 2 O 2 . The perfluorooctanoic acid (PFOA) removal at 180 min was 24.1% and 49.8% in the GF and GF-GE systems, respectively. The GF-GE@PANI system achieved 100% PFOA removal within 160 min. It was demonstrated that the enrichment of PANI with pyridine N provided many active sites for improving the conversion of H 2 O 2 to •OH and in-situ degrading organic pollutants, offering an alternative for wastewater treatment.
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