应用化学 ›› 2022, Vol. 39 ›› Issue (3): 451-460.DOI: 10.19894/j.issn.1000-0518.210159

• 研究论文 • 上一篇    下一篇

紫外高级还原技术还原降解水中N-亚硝基二甲胺

查晓松1,2(), 张琳1,2, 翁元婕1,2, 冯智梁1,2, 金苏雯1,2   

  1. 1.厦门大学嘉庚学院,环境科学与工程学院,漳州 363105
    2.厦门大学嘉庚学院,河口生态与环境健康福建省高校重点实验室,漳州 363105
  • 收稿日期:2021-03-31 接受日期:2021-08-18 出版日期:2022-03-01 发布日期:2022-03-15
  • 通讯作者: 查晓松
  • 基金资助:
    福建省自然科学基金(2020J05017);漳州市自然科学基金(ZZ2019J11)

Reductive Degradation of N⁃Nitrosodimethylamine in Water by Ultraviolet Advanced Reduction Processes

Xiao-Song ZHA1,2(), Lin ZHANG1,2, Yuan-Jie WENG1,2, Zhi-Liang FENG1,2, Su-Wen JIN1,2   

  1. 1.School of Environmental Science and Engineering,Tan KahKee College,Xiamen University,Zhangzhou 363105,China
    2.Key Laboratory of Estuarine Ecological Security and Environmental Health of Fujian Province,Zhangzhou 363105,China
  • Received:2021-03-31 Accepted:2021-08-18 Published:2022-03-01 Online:2022-03-15
  • Contact: Xiao-Song ZHA
  • About author:xszha@xujc.com
  • Supported by:
    the Natural Science Foundation of Fujian Province of China(2020J05017);the Natural Science Foundation of Zhangzhou City(ZZ2019J11)

摘要:

采用2种高级还原技术(UV/Na2SO3和UV/Na2S2O4)还原降解N-亚硝基二甲胺(NDMA),考察pH值、光照强度、还原剂质量浓度和溶解氧等因素对NDMA还原降解效果的影响,计算还原降解反应过程中的表观反应动力学常数,推断NDMA的还原降解机理。研究结果表明,弱酸性条件下有利于2种高级还原技术对NDMA的还原降解。增加光照强度会显著促进高级还原技术对NDMA的还原降解效果,而增加还原剂质量浓度对NDMA去除效果的影响较小。当pH=6.76,光照强度为8.7×10-11 E/s,Na2SO3质量浓度为10 mg/L时,经过60 min的反应后,NDMA去除率达到了94.4%。溶解氧会与还原性自由基发生反应,从而抑制了高级还原技术对NDMA的还原降解效果。高级还原技术与NDMA的还原降解反应主要存在3种可能的反应途径:光致水解、光致消去和光氧化。

关键词: 紫外高级还原技术, N-亚硝基二甲胺, 还原降解

Abstract:

Two ultraviolet advanced reduction processes (UV/Na2SO3 and UV/Na2S2O4) were used to reductively degrade N-nitrosodimethylamine (NDMA) in water and the effects of pH, light intensity, reductant dosage and dissolved oxygen on the removal efficiency of NDMA were investigated in this study. Moreover, the apparent kinetic constants under different reaction conditions were calculated and the reductive degradation mechanisms of NDMA by advanced reduction processes were inferred. The results show that the weak acid condition is favorable for the reductive degradation of NDMA by both UV/Na2SO3 and UV/Na2S2O4 advanced reduction processes. Increasing the light intensity can significantly promote the reductive degradation of NDMA by both advanced reduction processes, while increasing the reductant dosage has little influence on the reductive degradation of NDMA. The removal efficiency of NDMA reaches 94.4% after 60 minutes of reaction when the light intensity is 8.7×10-11 E/s, pH=6.76, and the Na2SO3 dosage is 10 mg/L. Dissolved oxygen can react with free reducing radicals, thus inhibit the reductive degradation of NDMA by advanced reduction processes. There are three possible reaction pathways for the reductive degradation of NDMA by advanced reduction processes: photohydrolysis, photolimination and photooxidation.

Key words: Ultraviolet advanced reduction processes, N-Nitrosodimethylamine, Reductive degradation

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