PVP 稳定纳米零价铁的特性及其在离子型表面活性剂存在下用于脱除土壤吸附 TCE 的研究
Characteristics of PVP-stabilised NZVI and application to dechlorination of soil-sorbed TCE with ionic surfactant.
机构信息
Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Space and Environment, Beihang University, Beijing, 100191, China.
Department of Qiaoxi District Environmental Law Enforcement of the Ecology and Environment Bureau of the XingTai City, Hebei, 054000, China.
出版信息
Chemosphere. 2020 Jan;239:124807. doi: 10.1016/j.chemosphere.2019.124807. Epub 2019 Sep 7.
The characteristics of polyvinylpyrrolidone (PVP)-stabilised nano-zero-valent iron (PVP-NZVI) and its application, combined with surfactant, to trichloroethylene (TCE)-contaminated soil were investigated. Two surfactants (cetyltrimethylammonium bromide [CTAB] and sodium dodecyl sulphate [SDS]) were tested for their ability to enhance the remedial activity of PVP-NZVI in 3 h batch experiments. The prepared PVP-NZVI formed nanoparticles ∼70 nm in diameter. The isoelectric point of PVP-NZVI was about 8.51, similar to the initial pH. X-ray diffraction and X-ray photoelectron spectroscopy analyses revealed that ZVI was the main active component of PVP-NZVI, and carbonised products of the target were observed. The TCE dechlorination efficiency by PVP-NZVI was about 84.73%; the efficiency by PVP-NZVI was about 20% higher when combined with SDS than with CTAB. Therefore, application of PVP-NZVI with SDS represents a potential remediation approach for TCE-contaminated soil.
研究了聚乙烯吡咯烷酮（PVP）稳定的纳米零价铁（PVP-NZVI）的特性及其与表面活性剂结合应用于三氯乙烯（TCE）污染土壤的情况。测试了两种表面活性剂（十六烷基三甲基溴化铵[CTAB]和十二烷基硫酸钠[SDS]）增强 PVP-NZVI 在 3 小时批量实验中的修复活性的能力。制备的 PVP-NZVI 形成了直径约 70nm 的纳米颗粒。PVP-NZVI 的等电点约为 8.51，与初始 pH 值相似。X 射线衍射和 X 射线光电子能谱分析表明，ZVI 是 PVP-NZVI 的主要活性成分，并且观察到目标的碳化产物。PVP-NZVI 的 TCE 脱氯效率约为 84.73%；当与 SDS 结合使用时，PVP-NZVI 的效率比与 CTAB 结合使用时提高了约 20%。因此，SDS 与 PVP-NZVI 的联合应用代表了一种潜在的 TCE 污染土壤修复方法。
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