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首页> 外文期刊>Desalination and water treatment >Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles
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Dechlorination of tetrachloroethylene in water using stabilized nanoscale iron and palladized iron particles

机译：使用稳定的纳米级铁和钯铁颗粒对水中的四氯乙烯进行脱氯

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摘要

Chlorinated solvents such as tetrachloroethylene (PCE) in aquifers should be remediated due to their toxicity that limited the use of groundwater resources. Nanoscale zero-valent iron (NZVI) and palladized/iron (Pd/Fe) bimetallic particles were synthesized and employed to react with PCE in water to investigate its degradation behaviors. Batch tests were conducted in a 1L serum bottle under airtight and anaerobic conditions with parameters of Pd mass contents, temperature, pH, and dispersant. The results showed that specific reaction rate constants (k_(SA)) of 5 mg L~(-1) PCE degraded by metal particles at 30℃ in the absence of dispersant enhanced with higher Pd mass contents on the Pd/Fe particles. Degradation rates of PCE increased as the reaction temperature was raised from 20 to 40℃. Carboxymethyl cellulose (CMC), a dispersant, enhanced the k_(SA) values of NZVI and 1:100 Pd/Fe particles by a factor of about 33 and 4 at 30℃, respectively. The tests of pH control with buffer solution indicated that PCE degradation rates were promoted under acid and neutral conditions. Additionally, no chlorinated by-products were observed during the experimental period in each test. This study shows that effective dechlorination of PCE in water could be achieved by synthesized Pd/Fe and NZVI particles coupled with CMC dispersant.
机译：含水层中的氯化溶剂（例如四氯乙烯（PCE））应予以补救，因为它们的毒性限制了地下水资源的使用。合成了纳米级零价铁（NZVI）和钯/铁（Pd / Fe）双金属颗粒，并与水中的PCE反应以研究其降解行为。在密闭和厌氧条件下，在1L血清瓶中进行批次测试，参数为Pd质量含量，温度，pH和分散剂。结果表明，在没有分散剂的情况下，金属粒子在30℃降解5 mg L〜（-1）PCE的比反应速率常数（k_（SA））随着Pd / Fe颗粒中Pd质量含量的增加而增强。随着反应温度从20℃升高到40℃，PCE的降解率增加。羧甲基纤维素（CMC），一种分散剂，在30℃时分别将NZVI和1：100 Pd / Fe颗粒的k_（SA）值提高了约33和4倍。用缓冲溶液控制pH的测试表明，在酸性和中性条件下，PCE的降解速率得到了提高。此外，在每个测试的实验期间，均未观察到氯化副产物。这项研究表明，通过合成的Pd / Fe和NZVI颗粒与CMC分散剂结合可以实现PCE在水中的有效脱氯。

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  • 来源
    《Desalination and water treatment》 |2014年第6期|702-711|共10页
  • 作者

    Shin-Shian Chen; Yi-Chu Huang; Jian-Yu Lin; Ming-Hei Lin;

  • 作者单位

    Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Rd. Nei Pu Township, Pingtung 91201, Taiwan;

    Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Rd. Nei Pu Township, Pingtung 91201, Taiwan;

    Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Rd. Nei Pu Township, Pingtung 91201, Taiwan;

    Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, 1 Hseuh Fu Rd. Nei Pu Township, Pingtung 91201, Taiwan;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Reaction kinetics; Bimetallic; Dispersant; Dechlorination; Chlorinated solvent;

    机译：反应动力学;双金属分散剂脱氯氯化溶剂;

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