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首页> 外文期刊>International Journal of Environmental Research and Public Health >Highly Efficient Arsenic Removal Using a Composite of Ultrafine Magnetite Nanoparticles Interlinked by Silane Coupling Agents
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Highly Efficient Arsenic Removal Using a Composite of Ultrafine Magnetite Nanoparticles Interlinked by Silane Coupling Agents

机译：使用硅烷偶联剂互连的超细磁铁矿纳米颗粒复合材料高效去除砷

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Arsenic (As) contamination in groundwater is a great environmental health concern and is often the result of contact between groundwater and arsenic-containing rocks or sediments and from variation of pH and redox potentials in the subsurface. In the past decade, magnetite nanoparticles (MNPs) have been shown to have high adsorption activity towards As. Alerted by the reported cytotoxicity of 5–12 nm MNP, we studied the adsorption behavior of 1.15 nm MNP and a MNP composite (MNPC), MNPs interlinked by silane coupling agents. With an initial concentration of As at 25 mg L?1, MNPs exhibited high adsorption capacity for As(V) and As (III), 206.9 mg·g?1 and 168.6 mg·g?1 under anaerobic conditions, respectively, and 109.9 mg·g?1 and 108.6 mg·g?1 under aerobic conditions, respectively. Under aerobic conditions, MNPC achieved even higher adsorption capacity than MNP, 165.1 mg·g?1 on As(V) and 157.9 mg·g?1 on As(III). For As(V) at 50 mg L?1, MNPC achieved an adsorption capacity as high as 341.8 mg·g?1, the highest in the literature. A kinetic study indicated that this adsorption reaction can reach equilibrium within 15 min and the rate constant of As(V) is about 1.9 times higher than that of As(III). These results suggested that MNPC can serve as a highly effective adsorbent for fast removal of As.
机译：地下水中的砷污染是对环境健康的重大关注，通常是地下水与含砷岩石或沉积物接触以及地下pH值和氧化还原电位变化的结果。在过去的十年中，磁铁矿纳米颗粒（MNP）已显示出对As的高吸附活性。受到所报告的5–12 nm MNP的细胞毒性的影响，我们研究了1.15 nm MNP和MNP复合物（MNPC）的吸附行为，MNP通过硅烷偶联剂相互连接。当初始浓度为25 mg L？1的As时，MNP对厌氧条件下的As（V）和As（III）的吸附能力较高，分别为206.9 mg·g？1和168.6 mg·g？1。在有氧条件下的浓度分别为mg·g？1和108.6 mg·g？1。在有氧条件下，MNPC的吸附量甚至高于MNP，As（V）上的吸附量为165.1 mg·g？1，As（III）上的吸附量为157.9 mg·g？1。对于50 mg L？1的As（V），MNPC的吸附容量高达341.8 mg·g？1，是文献中最高的。动力学研究表明，该吸附反应可在15分钟内达到平衡，As（V）的速率常数约为As（III）的1.9倍。这些结果表明，MNPC可以作为快速去除As的高效吸附剂。

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