研究报告
阮晓昕,吕树光,缪周伟,邱兆富,隋倩.磁铁矿活化过硫酸钠降解泥浆体系中的三氯乙烯[J].环境科学学报,2014,34(6):1489-1496
磁铁矿活化过硫酸钠降解泥浆体系中的三氯乙烯
- Trichloroethylene degradation in soil slurry system by magnetite activated persulfate oxidation
- 基金项目：环保公益性行业科研专项（No.201109013）；国家自然科学基金（No.41373094，51208199）；上海市自然科学基金（No.12ZR1408000）；中国博士后科学基金特别资助项目（No.2013T60429）；中央高校基本科研业务费专项
- 作者
- 单位
- 阮晓昕
- 华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237
- 吕树光
- 华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237
- 缪周伟
- 华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237
- 邱兆富
- 华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237
- 隋倩
- 华东理工大学国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237
- 摘要：研究了磁铁矿活化过硫酸钠技术氧化泥浆系统中三氯乙烯（TCE）的效果.同时，考察了Fe2+、Cl-和HCO3-对TCE降解过程的影响，并采用有机碳含量不同的2种天然土壤，以及用H2O2去除低聚合"软碳"和高温灼烧去除全部有机碳后所得到的2种土壤，考察了有机质含量对TCE降解的影响，检测了反应过程中有机质的变化.结果表明，在中性pH值条件下，磁铁矿活化过硫酸钠是表面活化反应，反应产物为α-Fe2O3，TCE氧化降解过程符合准一级反应动力学方程.在初始TCE浓度20 mg·L-1、磁铁矿投量20 g·L-1时，TCE在48 h后的去除率达到97%.Fe2+对反应有促进作用，Cl-和HCO3-均会对反应起到抑制作用，其中，HCO3-的抑制作用强于Cl-.TCE降解速率受土壤有机质含量影响较大，土壤去除有机质（SOM）后TCE的降解速率明显加快.通过检测有机质变化发现，过硫酸钠对有机质的去除较小，有机质对TCE降解的抑制可能是通过消耗过硫酸钠、表面消耗自由基和对有机污染物的竞争吸附等多种途径引起的.
- Abstract：Magnetite activated persulfate oxidation of trichloroethylene (TCE) was investigated in soil slurry system. The effects of Fe2+, Cl- and HCO3- on TCE degradation were investigated. Four types of soil, including two types of natural soil with different organic carbon contents and two types of soil with the low aggregation of "soft carbon" pretreated by H2O2 or with all of organic carbon removed by high temperature ignition from the original soil, were applied as samples to investigate the soil organic matter (SOM) influence. The results showed that magnetite activated persulfate was a surface reaction with α-Fe2O3 generation on the surface, and TCE degradation fitted pseudo-First-order kinetic model. 97% TCE removal was achieved, corresponding to initial TCE concentration of 20 mg·L-1 and magnetite dosage of 20 g·L-1 after 48 h reaction. Fe2+ enhanced TCE oxidation performance, while Cl- and particularly HCO3- anions had inhibitive effect on TCE removal. Considering the complexity of soil constitutes, especially for SOM, TCE degradation rate was significantly enhanced with SOM reduction. Through the detection of SOM content changes in reaction, it was suggested that persulfate weakly oxidized SOM. This negative effect on TCE degradation caused by SOM was probably due to the consumption of persulfate and generated free radicals on SOM surface, as well as competitive adsorption by SOM to target contaminant.
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