文章摘要
阮炽,刘长军,岳海荣,唐思扬,梁斌,鲁厚芳.聚吡咯改性石墨毡电极的氧还原性能及应用[J].精细化工,2020,37(9):
聚吡咯改性石墨毡电极的氧还原性能及应用
Oxygen reduction performance and application of polypyrrole-modified graphite felt electrode
投稿时间:2020-04-15  修订日期:2020-05-18
DOI:
中文关键词: 电芬顿  石墨毡  聚吡咯  氧还原反应  高盐有机废水
英文关键词: electro-Fenton  graphite felt  polypyrrole  oxygen reduction reaction  salty organic wastewater
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目);国家科技攻关计划
作者单位E-mail
阮炽 四川大学 348392511@qq.com 
刘长军 四川大学 liuchangjun@scu.edu.cn 
岳海荣 四川大学  
唐思扬 四川大学  
梁斌 四川大学  
鲁厚芳 四川大学  
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中文摘要:
      通过电化学氧化聚合法对石墨毡进行了聚吡咯改性,并利用SEM、FT-IR、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H2O2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的改性电极的两电子氧还原活性最高,H2O2生成速率为24.82 mg/(L·cm2·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,H2O2生成速率达到29.40 mg/(L·cm2·h)。以PPy/GF-Na2SO4-1000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,8 h后废水的COD可降至100 mg/L以下,去除率达到88.8%。经过6次循环实验后没有明显的活性降低。
英文摘要:
      Graphite felt was modified with polypyrrole by electrochemical oxidation polymerization. The morphology, elemental composition and electrochemical properties of the polypyrrole-modified graphite felts were characterized by SEM, FT-IR, XPS, LSV and EIS. The two-electron oxygen reduction activity of polypyrrole-modified graphite felts were characterized by H2O2 generation rate. The effects of supporting electrolyte and polymerization time on the structure and oxygen reduction performance of polypyrrole-modified graphite felts were investigated. The results showed that nitrogen atoms were introduced to the surface of graphite felts in the form of polypyrrole which greatly enhanced the oxygen reduction activity of graphite felts. Using sodium sulfate as supporting electrolyte led to better two-electron oxygen reduction activity and a H2O2 generation rate up to 24.82 mg/(L·cm2·h) at a cathode potential of -0.45 V. The two-electron oxygen reduction activity of the modified graphite felts increased first and then decreased with the increase of polymerization time. The sample with a polymerization time of 1000 s showed the highest H2O2 generation rate of 29.40 mg/(L·cm2·h). An electro-Fenton system was set up with PPy/GF-Na?2SO4-1000 as the cathode material to degrade the salty organic wastewater from an ethyl cellulose process. COD of the wastewater was reduced to less than 100 mg/L, with a degradation ratio of 88.8% after 8 hours reaction. No significant activity loss was observed after 6 cycles test.
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