在电化学高级氧化过程中,无机化副产品的阳极依赖性选择性和形成机制
Omidele Oluwafemi Benjamin1, Xinqing Liao1, Jinlong Fan2
1State Key Laboratory of Advanced Environmental Technology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Journal of environmental sciences (China)
|March 1, 2026
概括
在电化学高级氧化工艺 (EAOP) 中,阳极材料的选择对废水处理过程中化副产品的形成产生了重大影响. 不同的阳极产生不同的副产品,影响工艺效率和安全.
科学领域:
- 环境化学环境化学
- 电化学 电化学 电化学
- 水处理技术水处理技术
背景情况:
- 阳极材料在废水处理的电化学高级氧化过程 (EAOP) 中至关重要,影响了类物种的演变.
- 了解无机化副产品的形成对于优化EAOP效率和最大限度地降低环境风险至关重要.
研究的目的:
- 在EAOP中使用不同的阳极材料研究无机化副产品的形成.
- 为了阐明氧化机制,负责产生活性 (Ir-Ta@Ti,Ru-Ir-Sn@Ti) 和非活性 (PbO2,BDD) 阳极的副产品.
主要方法:
- 对四种阳极材料进行比较分析:Ir-Ta@Ti,Ru-Ir-Sn@Ti,PbO2和添加钻石 (BDD).
- 在受控电流密度 (40mA/cm2) 和时间 (120分钟) 下监测化副产品 (活性,ClO3-,ClO4-) 的形成.
- 动力分析和火试验以确定氧化途径 (直接电子转移与间接氧化).
主要成果:
- 活性阳极 (Ir-Ta@Ti,Ru-Ir-Sn@Ti) 主要产生活性 (92-98%的Cl-转化).
- 非活性阳极产生了不同的副产品:PbO2有利于ClO3- (67%的转换),而BDD主要形成ClO4- (89%的转换).
- 直接的电子转移主导着活性阳极,而间接的氧化是BDD的关键;PbO2显示了涉及多电子转移的复杂机制.
结论:
- 阳极材料的选择在很大程度上决定了EAOP中化副产品的类型和产量.
- 了解每个阳极的特定氧化机制对于控制副产品形成至关重要.
- 建议根据所需的氧化能力和副产品概况量身定制阳极选择,以实现有效的废水处理.
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