Characteristics and mechanism of atrazine removal from water by BDD anode

doi:10.19965/j.cnki.iwt.2021-0868

Abstract

Abstract:

As one of the simplest advanced oxidation technologies，anodic oxidation can effectively remove persistent organic pollutants，such as herbicides. An anodic oxidation system using a boron-doped diamond（BDD） anode was constructed to analyze the effects of electrolyte types，concentration and current density on the degradation efficiency of atrazine，which was a triazine herbicide. Also，the products of atrazine in BDD anodic oxidation system were qualitatively analyzed by UPLC-MS/MS. The results showed that atrazine could be completely removed by BDD anode after the reaction for 90 min with NaCl of 0.05 mol/L and current density of 12 mA/cm². After 300 min anodic oxidation，the mineralization rate of atrazine could reach（56±2.4）%. Six main products of atrazine were found in BDD anodic oxidation system. The main reaction types were dechlorination-hydroxylation，dechlorination-dealkylation，side chain alkylation oxidation，dehydrogenation-alkylene reaction.

Key words: anodic oxidation, BDD anode, atrazine, degradation mechanism

摘要：

阳极氧化技术作为最简单的高级氧化技术，可有效去除水中残留的除草剂等持久性有机污染物。利用硼掺杂金刚石（BDD）电极作为阳极构建了阳极氧化体系，研究了电解质种类、浓度和电流密度等参数对BDD阳极降解三嗪类除草剂阿特拉津效能的影响规律，并利用UPLC-MS/MS对阿特拉津的降解产物进行了定性分析。结果表明，在NaCl投加量为0.05 mol/L和电流密度为12 mA/cm²时，处理90 min后，BDD阳极基本可实现对阿特拉津的完全去除；处理300 min后，阿特拉津的矿化率可达（56±2.4）%。BDD阳极氧化体系共检出6种阿特拉津降解的主要产物，主要反应类型为脱氯-羟基化反应、脱氯-脱烷基化反应、侧链的烷基氧化反应、脱氢-烯化反应。

关键词: 阳极氧化, BDD阳极, 阿特拉津, 降解机理

CLC Number:

X703.1

Weijian JIA, Huayu ZHU, Desheng WANG, Baiguo JIANG. Characteristics and mechanism of atrazine removal from water by BDD anode[J]. Industrial Water Treatment, 2022, 42(6): 174-179.

贾伟建, 朱化雨, 王德生, 蒋佰果. BDD阳极去除水中阿特拉津的特性及机理研究[J]. 工业水处理, 2022, 42(6): 174-179.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2021-0868

https://www.iwt.cn/EN/Y2022/V42/I6/174

Figures/Tables 8

Fig. 1 Oxidation device of BDD anode

Fig. 2 The influence of electrolyte types on the degradation of atrazine

Fig. 3 The influence of NaCl concentration on the degradation of atrazine

Fig. 4 The influence of current density on the degradation of atrazine

Fig. 5 TOC removal rate in BDD anodizing system

Fig. 6 Extracted ion chromatogram of atrazine solution in BDD anodizing system

Table 1 MS spectra of atrazine and its products in BDD anodizing system

色谱峰	出峰时间/min	MS质谱图（ESI-）
1	7.42	—
2	9.89	—
3	12.60
4	14.06
5	14.46
6	14.88
7	15.44

Fig. 7 Atrazine degradation pathway in BDD anodizing system

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