Abstract

To develop an effective and novel adsorbent material consisting of three-layered core–shell particles with magnetic and photocatalytic properties, this study has utilized a sol–gel technique to synthesize Fe₃O₄/SiO₂/TiO₂/PAM (polyacrylamide) nanocomposite (FSTP NCs)-functionalized Fe₃O₄/SiO₂/TiO₂NPs as core and PAM as shell for water purification. The surface of the TiO₂ layer has been treated with silane A-174 (AA) as a coupling agent. In the final step, NPs were coated with PAM as an organic layer through radical polymerization of AA, to prepare a well-structured nanocomposite. FTIR, SEM, EDX, TEM, XRD, and VSM were applied to investigate the novel composed bonds, morphological properties of the surface and elemental analysis, core–shell structures, NPs size, samples phase and superparamagnetism of the NC and NPs, respectively. The R² values in three models of Langmuir (0.89), Freundlich (0.84), and Dubinin-Radushkevich (0.98) were calculated and the isotherm model followed a model with the highest R². The maximum efficiency of arsenate removal was recorded in 0.1 g concentration of adsorbent, pH 2, contact time of 700 min, and ion concentration of 50 mg/L.

Graphical abstract

摘要

为了开发一种由具有磁性和光催化性能的三层核壳颗粒组成的有效新型吸附材料，本研究利用溶胶-凝胶技术合成了Fe ₃ O ₄ /SiO ₂ /TiO ₂ /PAM（聚丙烯酰胺）纳米复合材料(FSTP NCs)功能化Fe ₃ O ₄ /SiO ₂ /TiO ₂ NPs为核，PAM为壳，用于水净化。TiO ₂层的表面已用硅烷A-174(AA)作为偶联剂进行处理。最后一步，通过 AA 的自由基聚合，将 PAM 作为有机层涂覆在纳米粒子上，以制备结构良好的纳米复合材料。应用 FTIR、SEM、EDX、TEM、XRD 和 VSM 分别研究了 NC 和 NP 的新颖组成键、表面形态特征和元素分析、核壳结构、纳米颗粒尺寸、样品相和超顺磁性。计算了Langmuir (0.89)、Freundlich (0.84) 和Dubinin-Radushkevich (0.98) 三个模型中的R 2值，^并且等温线模型遵循具有最高R ²的模型。吸附剂浓度为 0.1 g、pH 为 2、接触时间为 700 分钟、离子浓度为 50 mg/L 时记录到砷酸盐去除的最大效率。

图形概要