了解锆基纳米粒子去除二甲基砷的过程

Dandan Zhao , Chen Fu , Zhenglian Wu , Yang Yu
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引用次数: 0

摘要

地下水和地表水中的有机砷污染是人类面临的威胁之一。在本研究中,开发了一种新型的锆基纳米颗粒来去除水溶液中的二甲基芳烃(DMA)。通过各种分批吸附实验评价了吸附行为。pH效应研究表明,最大吸附量在pH 3.0左右实现。离子强度对DMA的吸收没有显著影响。吸附动力学研究表明,吸附平衡在24小时内建立;颗粒内动力学模型与实验数据吻合较好。在吸附等温线研究中,Langmuir方程比Freundlich方程更好地描述了吸附数据;在最佳pH下,吸附剂的最大吸附量为58.82mg As/g。在天然有机物和共存阴离子效应研究中,腐殖酸和共存阴离子的存在对DMA的吸收影响不大。在NOMs和共存阴离子的存在下,Zr基NP的性能没有受到很大的抑制。FTIR和XPS光谱分析表明DMA成功地吸附在吸附剂上,吸附机理为砷和硫酸根离子之间的离子交换。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Understanding the process in the removal of dimethylarsenic by a zirconium-based nanoparticle

Organic arsenic contamination in groundwater and surface water is one of threats to human beings. In this study, a novel zirconium-based nanoparticle was developed to remove dimethylarenic acid (DMA) from aqueous solution. The adsorption behavior was evaluated by various batch adsorption experiments. The pH effect study revealed that the maximum adsorption was achieved around pH 3.0. The ionic strength did not have significant effect on the uptake of DMA. The adsorption kinetics study showed that the adsorption equilibrium was established within 24 h; an intraparticle kinetics model fit the experimental data well. In the adsorption isotherm study, the Langmuir equation described the adsorption data better than the Freundlich equation; the maximum adsorption capacity of the sorbent was calculated to be 58.82 mg-As/g at the optimal pH. In the natural organic matters and coexisting anions effect studies, the presence of humic acid and coexisting anions have little effect on the uptake of DMA. The performance of the Zr-based NP was not largely inhibited in the presence of NOMs and coexisting anion. The FTIR and XPS spectroscopic analyses demonstrated that DMA was successfully adsorbed onto the sorbent and the adsorption mechanism was proposed to be ions exchange between arsenic and sulfate ions.

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