| 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 |
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| 引用本文： | 周景尧,李哲,陈家玮.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[J].地学前缘,2019,26(4):295-300. |
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| 作者姓名： | 周景尧 李哲 陈家玮 |
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| 作者单位： | 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;中国地质大学(北京)地球科学与资源学院,北京100083 |
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| 基金项目： | 国家自然科学基金重点项目(41731282) |
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| 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(Cu^2+、Pb^2+、Cd^2+,0.2mmol/L)在反应体系(初始条件:针铁矿,1.0g/L;PS,4mmol/L;SPY,10mg/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%;Pb^2+和Cd^2+对针铁矿/PS体系的影响较弱,去除率分别为30.8%和34.8%;Cu^2+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Pb^2+和Cd^2+主要通过影响吸附作用导致磺胺吡啶被去除,而Cu^2+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,Cu^2+/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。
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| 关 键 词： | 针铁矿 磺胺吡啶 重金属离子 地下水 高级氧化技术 |
| 收稿时间： | 2019-02-28 |
Effect of coexisting heavy metal ions on the activation of persulfate by goethite for the removal of sulfapyridine from aqueous solutions |
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| ZHOU Jingyao,LI Zhe,CHEN Jiawei.Effect of coexisting heavy metal ions on the activation of persulfate by goethite for the removal of sulfapyridine from aqueous solutions[J].Earth Science Frontiers,2019,26(4):295-300. |
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| Authors: | ZHOU Jingyao LI Zhe CHEN Jiawei |
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| Institution: | (State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences(Beijing),Beijing 100083,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China) |
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| 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. |
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| Keywords: | goethite sulfapyridine heavy metal ion groundwater advanced oxidation processes |
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