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首页> 外文期刊>RSC Advances >Metal (Cd, Cr, Ni, Pb) removal from environmentally relevant waters using polyvinylpyrrolidone-coated magnetite nanoparticles
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Metal (Cd, Cr, Ni, Pb) removal from environmentally relevant waters using polyvinylpyrrolidone-coated magnetite nanoparticles

机译：使用聚乙烯吡咯烷酮涂覆的磁铁矿纳米粒子从环保水域去除金属（CD，Cr，Ni，Pb）

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摘要

Water pollution is a major global challenge given the increasing growth in industry and human population, and certain metals can be highly toxic and contribute to this significantly. In this study, polyvinylpyrrolidone-coated magnetic nanoparticles (PVP–Fe _(3) O _(4) NPs) were used to remove metals (Cd, Cr, Ni, and Pb) from synthetic soft water and sea water in the presence and absence of fulvic acid. Nanoparticle (NP) suspensions were added to water media at a range of metal concentrations (0.1–100 mg L ~(?1) ). Removal at different time points (1.5, 3, 6, 12, 24 hours) was also evaluated. Results showed that 167 mg L ~(?1) PVP–Fe _(3) O _(4) NPs could remove nearly 100% of four metals at 0.1 mg L ~(?1) and more than 80% at 1 mg L ~(?1) . The removal decreased as the initial metal concentration increased, although essentially 100% of the Pb was removed under all conditions. The kinetic adsorption fitted well to the pseudo-second-order model and in general, the majority of metal adsorption occurred within the first 1.5 hours. These NPs are a reliable method to remove metals under a wide range of environmentally relevant conditions. Our previous research showed the NPs effectively removed oil from waters, so these NPs offer the possibility of combined in situ remediation of oil and metals.
机译：鉴于工业和人口的增长越来越大，水污染是一个重大的全球挑战，而某些金属可能会对毒性极高，并显着贡献。在该研究中，聚乙烯吡咯烷酮涂覆的磁性纳米颗粒（PVP-Fe _（3）O _（4）NPS）用于在存在和存在的情况下从合成软水和海水中除去金属（Cd，Cr，Ni和Pb）没有富甲酸。将纳米粒子（NP）悬浮液加入到水介质中，在一系列金属浓度（0.1-100mg L〜（α1））中。还评估在不同时间点（1.5,3,6,12,24小时）的去除。结果表明，167mg L〜（α1）PVP-FE _（3）O _（4）NPS可以在0.1mg L〜（α1）下近100％的四种金属，超过1mg l 〜（？1）。随着初始金属浓度的增加，去除降低，但在所有条件下基本上100％除去了100％的Pb。动力学吸附适用于伪二阶模型，一般来说，大部分金属吸附在首次为1.5小时内发生。这些NPS是一种可靠的方法，可以在各种环境相关条件下去除金属。我们以前的研究表明，NPS有效地从水域中取出油，因此这些NPS提供了与石油和金属的原位修复相结合的可能性。

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