Geogenic contamination of arsenic in the groundwater of the Indian subcontinent and other parts of the world has been reported. Many methods have been developed to remove arsenic species from water. The most promising technology is adsorption for its merits such as simple in operation, low cost, and considerably insignificant by-product formation. In this study, a new polymer-based nano-adsorbent for As(V) has been prepared using a synergistic approach of molecular imprinting and metal–organic ligand chemistry. The nano-adsorbent was formulated with cost-effective polymethacrylate imprinted with fluorescein and As(V) complex. After polymerization, As(V) in the polymer matrix was removed from the polymer to create cavities with a specific affinity for As(V). The imprinted polymer with nanopores (nanoMIP) has shown high adsorption capacity, i.e., 49 ± 7 mg L−1; and the adsorption phenomena were studied by using theoretical Langmuir and Freundlich isotherms. The adsorption kinetics data were well fitted with the pseudo-second-order rate equation. The analyte As(V) was effectively adsorbed onto nanoMIP from real environmental samples. Infrared spectra of nanoMIP have shown that electrostatic interaction between surface functionalities (such as, –COOH and –C=O) of nanoMIP with As(V) would be responsible for high adsorption capacity of As(V). The mode of binding of As(V) onto the nanoMIP was further justified by molecular modeling. About 98% of adsorbed As(V) was removed from nanoMIP by washing with 0.1 M HNO3 solution, and the regenerated nanoMIP showed re-adsorption for ten cycles. The leachate of spent nanoMIP contains as low as 0.9 µg L−1 of As(V), which is lower compared with commercially used iron and aluminum oxide-based adsorbents.

中文翻译：

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分子印迹纳米粒子（nanoMIPs）：一种高效的新型吸附剂，可去除水中的砷

印度次大陆和世界其他地区地下水中砷的地质污染已有报道。已经开发了许多方法来去除水中的砷物质。最有前途的技术是吸附，因为它具有操作简单、成本低、副产物形成相当少等优点。在这项研究中，使用分子印迹和金属有机配体化学的协同方法制备了一种新的基于聚合物的 As(V) 纳米吸附剂。这种纳米吸附剂由印有荧光素和 As(V) 复合物的经济高效的聚甲基丙烯酸酯制成。聚合后，聚合物基质中的 As(V) 从聚合物中去除，以产生对 As(V) 具有特定亲和力的空腔。带有纳米孔的印迹聚合物 (nanoMIP) 显示出高吸附能力，即 49 ± 7 mg L−1；并利用理论Langmuir和Freundlich等温线研究吸附现象。吸附动力学数据与拟二级速率方程非常吻合。分析物 As(V) 被有效地吸附到来自真实环境样品的 nanoMIP 上。nanoMIP 的红外光谱表明，nanoMIP 的表面官能团（例如 –COOH 和 –C=O）与 As(V) 之间的静电相互作用将导致 As(V) 的高吸附能力。通过分子建模进一步证明了 As(V) 与 nanoMIP 的结合模式。通过用 0.1 M HNO3 溶液洗涤，从 nanoMIP 中去除了大约 98% 的吸附 As(V)，再生的 nanoMIP 显示重新吸附十个循环。用过的 nanoMIP 的浸出液含有低至 0.9 µg L−1 的 As(V)，