Page 182 - 《精细化工》2020年第9期

第 37 卷第 9 期 精 细 化 工 Vol.37, No.9
202 0 年 9 月 FINE CHEMICALS Sept. 2020

有机电化学与工业
聚吡咯改性石墨毡电极的氧还原性能及应用

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阮 炽 ，刘长军 ，岳海荣 ，唐思扬 ，梁 斌 1,2 ，鲁厚芳
（1. 四川大学 化学工程学院，四川 成都 610065；2. 四川大学 新能源与低碳技术研究院，四川 成都
610065）
摘要：通过电化学氧化聚合法对石墨毡（GF）进行了聚吡咯（PPy）改性，并利用 SEM、FTIR、XPS、LSV 和
EIS 对聚吡咯改性石墨毡电极的形貌结构、元素组成和电化学性质进行了研究，采用 H 2 O 2 生成速率表征了改性
电极的两电子氧还原活性。考察了支持电解质种类和聚合时间对改性电极结构和氧还原性能的影响。结果表明，
通过改性能够在石墨毡表面引入吡咯氮结构，在恒–0.45 V 阴极电势的条件下，以硫酸钠为支持电解质制得改性
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电极的两电子氧还原活性最高，H 2 O 2 生成速率为 24.82 mg/(L·cm ·h)。改性石墨毡的两电子氧还原活性随着聚合
时间的延长先增加后降低，聚合时间为 1000 s 时所得改性石墨毡的两电子氧还原活性最高，H 2 O 2 生成速率达到
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29.40 mg/(L·cm ·h)。以 PPy/GF-Na 2 SO 4 -1000 为阴极材料构建电芬顿体系降解来自乙基纤维素生产过程的高盐有机
废水，阴极电势为–0.55 V 时，8 h 后废水的化学需氧量（COD）可降至 100 mg/L 以下，去除率达到 88.8%。
PPy/GF-Na 2 SO 4 -1000 经过 5 次循环实验后活性无明显变化。
关键词：电芬顿；石墨毡；聚吡咯；氧还原反应；高盐有机废水；有机电化学与工业
中图分类号：O646.5 文献标识码：A 文章编号：1003-5214 (2020) 09-1896-09

Oxygen reduction performance and application of
polypyrrole-modified graphite felt electrode

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RUAN Chi , LIU Changjun , YUE Hairong , TANG Siyang , LIANG Bin , LU Houfang
（1. School of Chemical Engineering, Sichuan University, Chengdu 610065, Sichuan, China; 2. Institute of New Energy
and Low-carbon Technology, Sichuan University, Chengdu 610065, Sichuan, China）
Abstract: Graphite felt (GF) was modified by polypyrrole (PPy) via electrochemical oxidation polymerization,
and the morphology, elemental composition and electrochemical properties of the polypyrrole-modified
graphite felt electrodes were characterized by SEM, FTIR, XPS, LSV and EIS. The two-electron oxygen
reduction activity of polypyrrole-modified graphite felt electrodes were characterized by H 2O 2 generation
rate. The effects of supporting electrolyte and polymerization time on the structure and oxygen reduction
performance of polypyrrole-modified graphite felt electrodes were investigated. The results showed that the
structure of pyrrole nitrogen could be introduced on the surface of graphite felt by modification. The
two-electron oxygen reduction activity of the modified electrode prepared with sodium sulfate as supporting
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electrolyte was the highest and a H 2O 2 generation rate was up to 24.82 mg/(L·cm ·h) at a cathode potential
of –0.45 V. The two-electron oxygen reduction activity of the modified graphite felt electrodes increased
first and then decreased with the increase of polymerization time. When the polymerization time was 1000 s,
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the obtained electrode (PPy/GF-Na 2 SO 4 -1000) showed the highest H 2 O 2 generation rate of 29.40 mg/(L·cm ·h).
An electro-Fenton system was constructed with PPy/GF-Na 2SO 4-1000 as cathode material to degrade the
high salt organic wastewater from the ethyl cellulose process. The chemical oxygen demand (COD) of
wastewater was reduced to less than 100 mg/L, and the removal rate was up to 88.8% after 8 hours reaction
at a cathode potential of –0.55 V. PPy/GF-Na 2SO 4-1000 had no significant activity loss after 5 cycles test.

收稿日期：2020-04-15; 定用日期：2020-05-18; DOI: 10.13550/j.jxhg.20200325
基金项目：国家自然科学基金（21878190，21406146）；国家科技攻关计划（2018YFB0605700）
作者简介：阮 炽（1996—），男，硕士生，E-mail：348392511@qq.com。联系人：刘长军（1979—），男，副教授，E-mail：
liuchangjun@scu.edu.cn。