化工进展 ›› 2018, Vol. 37 ›› Issue (05): 1992-1998.DOI: 10.16085/j.issn.1000-6613.2017-1528

• 资源与环境化工 • 上一篇    下一篇

氯离子活化过一硫酸钾降解水中甲氧苄啶

古振川1, 高乃云1, 安娜1, 陈菊香2   

  1. 1 同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092;
    2 新疆大学建筑工程学院, 新疆 乌鲁木齐 830046
  • 收稿日期:2017-07-24 修回日期:2017-09-01 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: 安娜,副研究员。
  • 作者简介:古振川(1992-),男,硕士研究生,主要从事水污染处理与控制研究。E-mail:gu26323@qq.com。
  • 基金资助:
    国家自然科学基金(51608372)及国家科技重大专项(2017ZX07207-004,2014ZX07406-002)项目。

Chloride ion activate peroxymonosulfate for degradation of trimethoprim in aqueous solution

GU Zhenchuan1, GAO Naiyun1, AN Na1, CHEN Juxiang2   

  1. 1 State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
    2 College of Architecture and Civil Engineering, Xinjiang University, Urumqi 830047, Xinjiang, China
  • Received:2017-07-24 Revised:2017-09-01 Online:2018-05-05 Published:2018-05-05

摘要: 以水中典型药物及个人护理品甲氧苄啶(TMP)为目标污染物,研究了氯离子活化过一硫酸钾(PMS)氧化降解TMP的效能和机理;对比了氯氧化工艺和Cl-活化PMS对TMP的去除效能;考察了底物初始浓度、NH4+、NO3-、CO32-、HCO3-、温度和腐植酸对TMP降解的影响。研究表明,TMP降解过程符合拟一级反应动力学模型,反应动力学常数为0.0296min-1R2 >0.97);随着TMP初始浓度的增加,反应速率常数kobs减小;氯氧化工艺和Cl-活化PMS对TMP的去除率相近,但Cl-活化PMS降解TMP的反应速率较慢。NH4+的存在会抑制降解反应,并且氯氧化工艺对NH4+更敏感;NO3-对降解反应无影响;CO32-和HCO3-的会抑制降解反应,CO32-浓度越大,抑制作用越强。HCO3-浓度越大,抑制作用越弱;温度越高,反应速率常数越大。根据阿伦尼乌斯方程,得到TMP的反应活化能Ea为66.97kJ/mol;溶液中腐植酸浓度越大,TMP的去除率越小。

关键词: 过一硫酸钾, 甲氧苄啶, 活性氯, 反应动力学

Abstract: In this work,the kinetics and mechanisms of TMP degradation by chloride ion (Cl-) directly reacting with peroxymonosulfate (PMS)were investigate by selecting typical pharmaceuticals and personal care products (PPCP)of trimethoprim (TMP)as target compounds. The effect of degradation efficiency was compared between chlorination and Cl-/PMS. Some factors affecting degradation was investigated,such as ammonium ions (NH4+),nitrate ions (NO3-),carbonate ions (CO32-),bicarbonate ions (HCO3-),temperature and humic acid. The results showed that TMP degradation fitted well with the pseudo-first-order kinetics. The pseudo-first-order-constant (kobs)is 0.0296min-1 (R2>0.97). kobs decreased with the increase of initial TMP concentration. The degradation efficiency of TMP by chlorination and Cl-/PMS was similar,but the reaction rate of Cl-/PMS was slower than that of chlorination. The presence of NH4+ will inhibit the degradation,and chlorination is more sensitive to NH4+. CO32- and HCO3- are harmful to the degradation of TMP,and the greater concentration of CO32-,the stronger inhibition effect,the greater the concentration of HCO3-,the weaker inhibition effect. Increasing solution temperature will efficiently accelerate the degradation of TMP. The reaction activation energy is 66.97kJ/mol. The presence of humic acid also retarded the removal of TMP to a certain extent.

Key words: trimethoprim, peroxymonosulfate, active chlorine, reaction kinetics

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