Abstract Highly effective nanoadsorbent based on β-Cyclodextrin intercalated Fe-Al layered double hydroxide/reduced Graphene Oxide (FAH-rGO/CD) nanocomposites were synthesized through hydrothermal and ex-situ polymerization process for As (V) adsorption in wastewater. Characterization results of XRD, FESEM and HRTEM reveals the crystalline structure and morphology of the FAH-rGO/CD nanocomposites. The elemental composition and functional groups of the composites were investigated by EDS and FTIR. N2 adsorption-desorption analysis was utilized to determine the surface area of the prepared nanocomposite and the incorporated β-CD moieties enhances the surface area of FAH-rGO (145.35 m2g−1). Various adsorption parameters of nanoadsorbents such as the effect of pH, contact time, adsorbent dosage, adsorption isotherms and kinetics were studied and reported. The obtained adsorption isotherm data of synthesized adsorbent was properly fitted with Langmuir isotherm model along with their maximum monolayer adsorption capacity of 185.52 mg g−1 for As (V). The Pseudo-first and second kinetic models were used to assess the kinetic data and the adsorption of As (V) pursued the Pseudo second order model with high correlation co-efficient R2 value (0.9836). Moreover, as-synthesized adsorbents had good recyclability up to 89%, even after five adsorption-desorption analysis. Meanwhile, the presence of co-existing anions on sorption of As (V) was evaluated and their results indicate that, the high concentration of phosphate and carbonate ions inhibited the efficiency of As (V) removal. Thus, high surface area with abundant oxygen containing hydroxyl groups and magnetic properties of FAH-rGO/CD nanocomposites proved to be highly effective adsorbent for As (V) removal in wastewater.

中文翻译：

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使用β-环糊精插层Fe-Al层状双氢氧化物/还原氧化石墨烯纳米复合材料去除水中的As（V）

摘要 通过水热和异位聚合工艺合成了基于β-环糊精插层Fe-Al层状双氢氧化物/还原氧化石墨烯（FAH-rGO/CD）纳米复合材料的高效纳米吸附剂，用于吸附废水中的As（V）。XRD、FESEM 和 HRTEM 的表征结果揭示了 FAH-rGO/CD 纳米复合材料的晶体结构和形貌。通过EDS和FTIR研究了复合材料的元素组成和官能团。N2 吸附-解吸分析用于确定制备的纳米复合材料的表面积，掺入的 β-CD 部分增强了 FAH-rGO（145.35 m2g-1）的表面积。纳米吸附剂的各种吸附参数，如 pH 值的影响、接触时间、吸附剂用量、研究并报道了吸附等温线和动力学。所获得的合成吸附剂的吸附等温线数据与朗缪尔等温线模型及其对 As (V) 的最大单层吸附容量为 185.52 mg g-1 正确拟合。伪一级和二级动力学模型用于评估动力学数据，As (V) 的吸附遵循具有高相关系数 R2 值 (0.9836) 的伪二级模型。此外，即使经过五次吸附-解吸分析，合成后的吸附剂仍具有高达 89% 的良好回收率。同时，评估了共存阴离子的存在对 As (V) 的吸附，其结果表明，高浓度的磷酸盐和碳酸根离子抑制了 As (V) 的去除效率。因此，