A bifunctionalized magnetic mesoporous silica (NZVI-SH-HMS) material with thiol and nanometer zero-valent iron immobilized on the surface was synthesized at ambient temperature by gel-sol and wet impregnation methods, which was successfully used to remove lead and cadmium ions from aqueous solution. SEM, TEM images and FTIR spectra showed that thiol and NZVI were stable and evenly dispersed onto the surface of HMS. N₂ adsorption–desorption isotherms indicated NZVI-SH-HMS owned good porous properties with a large specific surface area (312.84 m²/g) and proper pore size (2.56 nm). XRD and XPS results confirmed the material was superparamagnetic and the main process for removing heavy metals was the formation of Pb₃(CO₃)₂(OH)₂, PbS, Cd_xFe_(1-x)(OH)₂ and Cd(OH)₂. The theoretical maximum adsorption capacity of NZVI-SH-HMS was 487.8 mg Pb(II)/g and 330.0 mg Cd(II)/g, respectively. Adsorption isotherm and kinetics data fitted perfectly to Langmuir isotherm model and followed the pseudo-second-order kinetics. Batch experiments indicated that the main adsorption mechanisms could be precipitation/co-precipitation and surface complexation between the heavy metal ions and the adsorbents. Additionally, NZVI-SH-HMS exhibited excellent adsorption capacities and sorption recyclability in various simulated wastewater (the surface water, tap water, sewage plant wastewater and domestic wastewater), which showed the promising capabilities for the removal of heavy metal ions in actual water environment. These results suggested that the synergistic effects of NZVI and thiol greatly improved the adsorption performance of the bifunctionalized magnetic mesoporous silica materials.

在室温下通过凝胶-溶胶和湿法浸渍法合成了巯基和纳米零价铁固定在表面的双功能磁性介孔二氧化硅（NZVI-SH-HMS）材料，该材料已成功用于去除铅和镉离子。水溶液。SEM，TEM图像和FTIR光谱表明，巯基和NZVI稳定且均匀地分散在HMS表面。N ₂吸附-解吸等温线表明NZVI-SH-HMS具有良好的多孔性，具有较大的比表面积（312.84 m ² / g）和适当的孔径（2.56 nm）。XRD和XPS结果证实了该材料是超顺磁性的，去除重金属的主要过程是形成Pb ₃（CO ₃）_2。（OH）₂，PbS，Cd _x Fe _（1-x）（OH）₂和Cd（OH）₂。NZVI-SH-HMS的理论最大吸附容量分别为487.8 mg Pb（II）/ g和330.0 mg Cd（II）/ g。吸附等温线和动力学数据完全符合Langmuir等温线模型，并遵循伪二级动力学。批处理实验表明，主要的吸附机理可能是重金属离子与吸附剂之间的沉淀/共沉淀和表面络合。此外，NZVI-SH-HMS在各种模拟废水（地表水，自来水，污水处理厂废水和生活废水）中均表现出优异的吸附能力和吸附回收利用能力，在实际水环境中具有去除重金属离子的潜力。 。