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In-situ synthesis of hydrogen peroxide in a novel Zn-CNTs-O_2 system

机译：新型Zn-CNTs-O_2体系中原位合成过氧化氢

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摘要

A novel strategy of in-situ synthesis of hydrogen peroxide (H2O2) was formulated and evaluated. Oxygen was selectively reduced to H2O2 combined with electrochemical corrosion of zinc in the Zn-CNTs-O-2 system. The ratio of zinc and CNTs, heat treatment temperature, and operational parameters such as composite dosage, initial pH, solution temperature, oxygen flow rate were systematically investigated to improve the efficiency of H2O2 generation. The Zn-CNTs composite (weight ratio of 2.5:1) prepared at 500 degrees C showed the maximum H2O2 accumulation concentration of 293.51 mg L-1 within 60 min at the initial pH value of 3.0, Zn-CNTs dosage of 0.4 g and oxygen flow rate of 400 mL min(-1). The oxygen was reduced through two-electron pathway to hydrogen peroxide on CNTs while the zinc was oxidized in the system and the dissolved zinc ions convert to zinc hydroxide and depositing on the surface of CNTs. It was proposed that the increment of direct H2O2 production was caused by the improvement of the formed Zn/CNTs corrosion cell. This provides promising strategy for in situ synthesis and utilization of hydrogen peroxide in the novel Zn-CNTs-O-2 system, which enhances the environmental and economic attractiveness of the use of H2O2 as green oxidant for wastewater treatments.
机译：制定并评估了一种原位合成过氧化氢（H2O2）的新策略。结合在Zn-​​CNTs-O-2系统中锌的电化学腐蚀，将氧气选择性还原为H2O2。系统研究了锌与碳纳米管的比例，热处理温度以及操作参数，如复合剂量，初始pH，溶液温度，氧气流速，以提高过氧化氢的产生效率。在500℃下制备的Zn-CNTs复合物（重量比为2.5：1）在初始pH值为3.0，Zn-CNTs剂量为0.4 g和氧气的情况下，在60分钟内最大H2O2积累浓度为293.51 mg L-1。流速为400 mL min（-1）。氧通过双电子途径还原为CNT上的过氧化氢，同时锌在系统中被氧化，溶解的锌离子转化为氢氧化锌并沉积在CNT的表面上。有人提出，H2O2直接产生的增加是由于所形成的Zn / CNTs腐蚀池的改进所致。这为在新型Zn-CNTs-O-2系统中原位合成和利用过氧化氢提供了有希望的策略，从而增强了使用H2O2作为绿色氧化剂处理废水的环境和经济吸引力。

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  • 来源
    《Journal of power sources》 |2018年第28期|190-197|共8页
  • 作者

    Gong Xiao-bo; Yang Zhao; Peng Lin; Zhou An-lan; Liu Yan-lan; Liu Yong;

  • 作者单位

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

    Sichuan Normal Univ, Coll Chem & Mat Sci, Chengdu 610066, Sichuan, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Hydrogen peroxide; In-situ generation; Oxygen reduction reaction; Zn-CNTs composite;

    机译：过氧化氢原位生成氧还原反应Zn-CNTs复合材料;

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