In this study, a novel mesoporous magnetic composite material (Fe3O4@SiO2/CTAB-SiO2) was prepared by a sol-gel and etching method. The morphology, composition, structure, and magnetic properties of the mesoporous Fe3O4@SiO2/CTAB-SiO2 composite material were characterized, and the feasibility of using it to remove bisphenol A (BPA) from water was studied. The results showed that under the optimal adsorption conditions, the removal efficiency of BPA by the composite material is 93.2%. Also, the adsorption isotherms and adsorption kinetic studies showed that the Freundlich isotherm model and the pseudo-second-order kinetic model could better describe the equilibrium and kinetic behaviors of the adsorption process. The maximum adsorption capacity of the composite material for the adsorption of BPA was evaluated as 208.3 mg/g, which was a remarkable amount. The thermodynamic study indicated that the adsorption process was chemical, spontaneous, and exothermic, and the main interaction mechanisms with BPA might be electrostatic and hydrophobic interactions. In addition, after 6 cycles of adsorption-desorption, the recovery efficiency was 80.5% and the FTIR, XRD, and TEM tests showed that the overall structure of the composite material was relatively stable, and the results of real sample verification show that the recovery rate of different added BPA concentration (10, 30, and 50 μg/L) was above 90%. In summary, this composite material is a promising effective magnetic adsorbent for removing bisphenols.

中文翻译：

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新型介孔Fe3O4@SiO2/CTAB-SiO2复合材料的合成及其在高效去除水中双酚A中的应用

本研究采用溶胶-凝胶法和蚀刻法制备了一种新型介孔磁性复合材料(Fe3O4@SiO2/CTAB-SiO2)。表征了介孔Fe3O4@SiO2/CTAB-SiO2复合材料的形貌、组成、结构和磁性能，研究了用其去除水中双酚A（BPA）的可行性。结果表明，在最佳吸附条件下，复合材料对BPA的去除率为93.2%。此外，吸附等温线和吸附动力学研究表明，Freundlich 等温线模型和准二级动力学模型可以更好地描述吸附过程的平衡和动力学行为。复合材料对 BPA 吸附的最大吸附容量为 208.3 mg/g，这是一个了不起的数目。热力学研究表明吸附过程是化学的、自发的和放热的，与BPA的主要相互作用机制可能是静电和疏水相互作用。此外，经过6次吸附-解吸循环后，回收率为80.5%，FTIR、XRD、TEM测试表明复合材料整体结构相对稳定，实样验证结果表明回收率不同BPA浓度（10、30、50 μg/L）的添加率均在90%以上。总之，这种复合材料是一种很有前途的有效去除双酚的磁性吸附剂。与 BPA 的主要相互作用机制可能是静电和疏水相互作用。此外，经过6次吸附-解吸循环后，回收率为80.5%，FTIR、XRD、TEM测试表明复合材料整体结构相对稳定，实样验证结果表明回收率不同BPA浓度（10、30、50 μg/L）的添加率均在90%以上。总之，这种复合材料是一种很有前途的有效去除双酚的磁性吸附剂。与 BPA 的主要相互作用机制可能是静电和疏水相互作用。此外，经过6次吸附-解吸循环后，回收率为80.5%，FTIR、XRD、TEM测试表明复合材料整体结构相对稳定，实样验证结果表明回收率不同BPA浓度（10、30、50 μg/L）的添加率均在90%以上。总之，这种复合材料是一种很有前途的有效去除双酚的磁性吸附剂。实样验证结果表明，不同添加浓度（10、30、50 μg/L）的BPA回收率均在90%以上。总之，这种复合材料是一种很有前途的有效去除双酚的磁性吸附剂。实样验证结果表明，不同添加浓度（10、30、50 μg/L）的BPA回收率均在90%以上。总之，这种复合材料是一种很有前途的有效去除双酚的磁性吸附剂。