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首页> 外文期刊>RSC Advances >Adsorption of Hg2+ by thiol functionalized hollow mesoporous silica microspheres with magnetic cores
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Adsorption of Hg2+ by thiol functionalized hollow mesoporous silica microspheres with magnetic cores

机译：硫醇官能化的带磁芯的中空介孔二氧化硅微球吸附Hg2 +

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摘要

Novel hollow mesoporous silica spheres with magnetic cores (HMSMCs) were successfully synthesized by using hybrid magnetic carbon (Fe3O4/C) spheres as templates. The microspheres were further functionalized with (3-mercaptopropyl)trimethoxysilane (MPTS) to produce thiol functionalized HMSMCs (SH-HMSMCs), and their ability to absorb traces of toxic Hg2+ was evaluated. The characterization results revealed that the hollow microspheres were 250-300 nm in diameter. The thickness of the shell was about 50 nm, in which contained an inner core of Fe3O4 crystallites with a size of about 10 nm. It was also found that the saturation magnetization of the sample was 62.5 emu g(-1) and the BET surface area was 421 m(2) g(-1). These magnetic hybrid silica microspheres with thiol functional groups were found to have a high affinity to Hg2+, and were able to reduce even a low concentration of Hg2+ (<1 mg L-1) down to about 0.53 mu g L-1, which was less than the Hg2+ content in the drinking water standard. The super strong affinity towards Hg2+ was attributed to the synergistic effect of the thiol groups and the unique structure of the microspheres. Moreover, the microspheres as adsorbents could be easily separated by an external magnetic field, and the adsorbed Hg2+ on the adsorbents could be removed by using hydrochloric acid, thus the adsorbents are readily reusable.
机译：以杂化磁性碳（Fe3O4 / C）球为模板，成功合成了具有磁芯的新型中空介孔二氧化硅球（HMSMC）。将微球进一步用（3-巯基丙基）三甲氧基硅烷（MPTS）功能化，以生产硫醇官能化的HMSMC（SH-HMSMCs），并评估了它们吸收痕量有毒Hg2 +的能力。表征结果表明，空心微球的直径为250-300nm。壳的厚度为约50nm，其中含有尺寸为约10nm的Fe 3 O 4微晶的内芯。还发现样品的饱和磁化强度为62.5 emu g（-1），BET表面积为421 m（2）g（-1）。发现这些具有硫醇官能团的磁性杂化二氧化硅微球对Hg2 +具有高亲和力，甚至能够将低浓度的Hg2 +（<1 mg L-1）降低至约0.53μgL-1，这是低于饮用水标准中的Hg2 +含量。对Hg2 +的超强亲和力归因于硫醇基团的协同作用和微球的独特结构。此外，微球作为吸附剂可以容易地被外部磁场分离，并且吸附剂上吸附的Hg2 +可以通过使用盐酸去除，因此吸附剂易于重复使用。

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