化工进展 ›› 2020, Vol. 39 ›› Issue (10): 4256-4267.DOI: 10.16085/j.issn.1000-6613.2019-1987

• 资源与环境化工 • 上一篇    下一篇

中间层为聚吡咯的复合电极深度处理焦化废水

杨丙衡1,2,3(), 安路阳1,2,3(), 张立涛1,2,3, 宋迪慧1,2,3, 刘合鑫1,2,3   

  1. 1.中钢集团鞍山热能研究院,辽宁 鞍山 114000
    2.辽宁省钢铁行业废水深度处理技术工程研究中心,辽宁 鞍山 114000
    3.环境工程院士工作站,辽宁 鞍山 114000
  • 出版日期:2020-10-05 发布日期:2020-10-09
  • 通讯作者: 安路阳
  • 作者简介:杨丙衡(1993—),男,硕士研究生,研究方向为煤化工废水高级氧化技术。E-mail:yangbingheng1993@163.com
  • 基金资助:
    辽宁省重点研发计划指导计划(2018230004)

Treatment of coking wastewater with composite electrode with PPy as middle layer

Bingheng YANG1,2,3(), Luyang AN1,2,3(), Litao ZHANG1,2,3, Dihui SONG1,2,3, Hexin LIU1,2,3   

  1. 1.Sinosteel Anshan Research Institute of Thermo-energy Company Limited, Anshan 114000, Liaoning, China
    2.Engineering Research Center for Iron and Steel Industry Wastewater Advanced Treatment Technology of Liaoning Province, Anshan 114000, Liaoning, China
    3.Environmental Engineering Academician Experts Workstation, Anshan 114000, Liaoning, China
  • Online:2020-10-05 Published:2020-10-09
  • Contact: Luyang AN

摘要:

电催化技术深度处理焦化废水仍受极板导电性和催化活性制约而无法广泛应用。本文在以掺杂锑的二氧化锡的钛网(Ti/SnO2-Sb)为底层、以掺杂铈的二氧化铅(PbO2-Ce)为顶层的二维结构之间插入良好导电性的非离子型高聚化合物聚吡咯(PPy),形成具有三维结构的Ti/SnO2-Sb/PPy/PbO2-Ce电极能够增加电流效率,提高催化活性。分别通过X射线衍射图谱、高分辨率透射电子显微镜、X射线光电子能谱和热重分析来表征电极的结构、元素的化学状态和热稳定性,通过线性扫描伏安法和循环伏安法测试电极的电化学表面行为。分析表明,铈的掺杂使极板羟基自由基(·OH)产生量有较大增幅;PPy中间层的插入增强了电极热稳定性,使电流效率提升至7.55%。电化学分析表明Ti/SnO2-Sb/PPy/PbO2-Ce电极具有较高的活性表面积和析氧电位。为使极板达到最佳应用条件,通过响应面法得到一组预测优化参数:电流密度161.18A/m2,电解质浓度5.90g/L,极板间距1.58cm,初始pH为9.05。在最优条件下,对焦化废水的降解效率达到90.47%,能耗为0.787kW·h/g,并据此对可能得催化氧化原理提供预测。

关键词: 电化学, 焦化废水, 二氧化铅电极, 响应面法, 环境, 催化

Abstract:

The advanced treatment of coking wastewater by electrocatalytic technology is still limited by the insufficient conductivity and catalytic activity of the plates and cannot be widely used. Nonconductive polypyrrole (PPy) with good conductivity was inserted into the two-dimensional structure with antimony-doped tin dioxide (Ti/SnO2-Sb) as the bottom layer and cerium-doped lead dioxide (PbO2-Ce) as the top layer, to form a three-dimensional Ti/SnO2-Sb/PPy/PbO2-Ce electrode that can increase the current efficiency and improve the catalytic activity. The structure of the electrode, the chemical state of the element, and the thermal stability were characterized by X-ray diffraction patterns, high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis, respectively. Electrochemical surface behavior of the electrodes was tested by linear scanning voltammetry and cyclic voltammetry. The analysis showed that the doping of cerium significantly increased the amount of hydroxyl radicals (·OH) on the plate and the insertion of PPy into the intermediate layer improved the electrode’s thermal stability and increased the current efficiency to 7.55%. Electrochemical analysis showed that the Ti/SnO2-Sb/PPy/PbO2-Ce electrode had high active surface area and oxygen evolution potential. In order to achieve the best performance for the plates, a set of optimal operation parameters were predicted by using the response surface method as current density 161.18A/m2, electrolyte concentration 5.90g/L, plate spacing 1.58cm, and initial pH 9.05. Under the optimal conditions, the degradation efficiency of coking wastewater reached 90.47%, and the energy consumption was 0.787kW·h/g. Based on the results, the possible catalytic oxidation principles was provided.

Key words: electrochemistry, coking wastewater, PbO2 electrode, response surface method, environment, catalysis

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