采用碱性熔盐电化学方法处理多氯联苯(PCBs)污染物,该处理技术通过电解的方式原位产生氧化剂和还原剂,并以碱性高温熔盐作为反应介质促进分解反应的发生。通过考察PCBs浓度、熔盐体系、反应温度、工作时间、电解电压等工艺参数对PCBs处理效率的影响,探索最佳PCBs处理工艺条件。试验结果表明:PCBs的去除效率随反应温度和电解电压的升高而提高,随进样量的增多和运行时间的延长而降低;此外,不同熔盐组分也会影响PCBs的去除效率;在优化后的工艺参数条件下,采用1 h预电解的方式,多氯联苯的去除效率达到了99%以上。研究成果为PCBs等氯代芳香烃的治理提供了新的途径。
Abstract
In this study, alkali molten salt electrochemical method was applied to degrade polychlorinated biphenyls (PCBs). Oxidizers and reductants can be generated in situ by this method by electrolyzing and promoting decomposition reaction due to high temperature and alkali molten salt. The optimum technical conditions for PCBs treatment were explored by examining the influences of technical parameters including PCBs concentration, molten salt system, reaction temperature, reaction time, electrolysis voltage on treatment efficiency. Research result indicated that the PCBs removal efficiency was improved with the climbing of reaction temperature and electrolysis voltage, but inhibited with the increase of PCBs concentration and reaction time. Moreover, the composition of molten salt system also observably affected the PCBs removal efficiency. In optimized conditions, the removal rates of PCBs reached 99% after pre-electrolysis for one hour. This study offers a novel approach for the treatment of chlorination aromatic hydrocarbons such as PCBs.
关键词
多氯联苯 /
熔盐电化学 /
去除效率 /
氯代芳香烃 /
预电解
Key words
PCBs /
molten salt electrochemistry /
removal efficiency /
chlorination aromatic hydrocarbons /
pre-electrolysis
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基金
国家自然科学基金青年科学基金项目(51709011)
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