地学前缘 ›› 2019, Vol. 26 ›› Issue (4): 295-300.DOI: 10.13745/j.esf.sf.2019.5.28

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共存重金属离子对针铁矿活化过硫酸盐去除水中磺胺吡啶的影响

周景尧,李哲,陈家玮   

  1. 1. 中国地质大学(北京) 生物地质与环境地质国家重点实验室, 北京 100083
    2. 中国地质大学(北京) 地球科学与资源学院, 北京 100083
  • 收稿日期:2019-02-28 修回日期:2019-03-25 出版日期:2019-07-25 发布日期:2019-07-25
  • 通讯作者: 陈家玮(1974—),男,博士,教授,博士生导师,从事环境地球化学研究。
  • 作者简介:周景尧(1994—),男,硕士研究生,地质工程专业。
  • 基金资助:
    国家自然科学基金重点项目(41731282)

ZHOU Jingyao,LI Zhe,CHEN Jiawei   

  1. 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences(Beijing), Beijing 100083, China
    2. School of Earth Sciences and Resources, China University of Geosciences(Beijing), Beijing 100083, China
  • Received:2019-02-28 Revised:2019-03-25 Online:2019-07-25 Published:2019-07-25
  • Supported by:
     

摘要: 基于硫酸根自由基的高级氧化技术能有效降解水中磺胺类药物残留。由于在自然环境中共存重金属会对环境修复效果产生一定影响,文中重点研究了不同pH环境条件下不同重金属离子对针铁矿活化过硫酸盐(PS)去除水中磺胺吡啶(SPY)的影响。不同类型重金属离子(Cu2+、Pb2+、Cd2+,0.2 mmol/L)在反应体系(初始条件:针铁矿,1.0 g/L; PS,4 mmol/L;SPY,10 mg/L;pH=8.2)中对SPY的降解对比研究发现:在无重金属共存的条件下,针铁矿/PS体系降解SPY的去除率为25.2%;Pb2+和Cd2+对针铁矿/PS体系的影响较弱,去除率分别为30.8%和34.8%;Cu2+的促进作用很大,可以使SPY被完全降解(100%)。机理分析认为,在针铁矿/PS体系中Pb2+和Cd2+主要通过影响吸附作用导致磺胺吡啶被去除,而Cu2+主要通过自身活化PS的作用。不同pH条件(3.0,8.0,12.0)实验证实弱碱性条件下,Cu2+/针铁矿/PS能够发挥较高的活性从而降解SPY。本文结果为采用针铁矿活化过硫酸盐技术修复类似复合污染地下水环境提供了实验依据。

 

Abstract: Sulfonamides (SAs) can be degraded effectively by the sulfate radical based advanced oxidation processes (SR-AOPs) in aqueous solutions. The remediation efficiency could be affected by the coexisting heavy metal ions in the natural environment. Accordingly in the present study, we focused on the effects of different metal ions on the activation of persulfate (PS) by goethite for the sulfapyridine (SPY) removal under different pH conditions. The experiments were conducted in systems (initial conditions: goethite, 1.0 g/L; PS, 4 mmol/L; SPY, 10 mg/L; pH=8.2) containing coexisting heavy metal ions (Cu2+, Pb2+ and Cd2+, 0.2 mmol/L) and SPY degradation was monitored. The results showed that the removal of SPY in the goethite/PS system without heavy metal ions was 25.2%, and the effects of Pb2+ and Cd2+ were small (Pb2+, 30.8%; Cd2+, 34.8%). Comparingly, SPY degradation was enhanced to a complete removal (100%) by Cu2+. Mechanistic analysis indicated that Pb2+ and Cd2+ mainly affected the adsorption of SPY in the goethite/PS system, but Cu2+ by itself could activate PS. Under different pH conditions (3.0, 8.0 and 12.0), we confirmed that the Cu2+/goethite/PS system could remove SPY completely from a weak alkaline solution. This study therefore provided experimental evidence in supporting the use of goethite for perfulfate activation in the remediation of complex pollutants in aqueous media.

Key words: goethite, sulfapyridine, heavy metal ion, groundwater, advanced oxidation processes