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Removal and recovery of mercury from aqueous solution using magnetic silica nanocomposites nanocomposites

机译：使用磁性二氧化硅纳米复合材料从水溶液中去除和回收汞

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摘要

Thiol-functionalized magnetic silica nanocomposite was synthesized and tested for its mercury pick-up capability in aqueous solution. Magnetic property was to be utilized upon the collection of the adsorbents and the recovery adsorbed Hg by subsequent separation process. Cobalt ferrite nanoparticle, the core of magnetic silica nanocomposite, was synthesized using a thermal decomposition method and grown to a particle having an average size of 13 nm. The dispersed nanoparticles were then further arranged into spherical groups using a nanoemulsion method to enhance the reactivity toward magnets followed by tetraethyl orthosilicate coating using a modified Stober method. The pore structure was modified by an additional coating of cetyltrimethylammonium bromide and tetraethyl orthosilicate. Finally, the surface of the magnetic silica nanocomposite was functionalized with thiol group. When tested for mercury adsorption capacity, a sufficiently high Hg adsorption capacity of 19.79 mg per g of adsorbent was obtained at room temperature and a pH of 5.5.
机译：合成了硫醇官能化磁性二氧化硅纳米复合材料，并测试了其在水溶液中的汞吸收能力。在收集吸附剂并通过随后的分离过程回收吸附的汞时，将利用磁性。使用热分解方法合成了磁性二氧化硅纳米复合材料的核心铁氧体钴纳米颗粒，并使其生长成平均粒径为13 nm的颗粒。然后使用纳米乳液方法将分散的纳米颗粒进一步排列成球形，以增强对磁体的反应性，然后使用改进的Stober方法涂覆原硅酸四乙酯。通过另外涂覆十六烷基三甲基溴化铵和原硅酸四乙酯来修饰孔结构。最后，磁性二氧化硅纳米复合材料的表面被巯基官能化。当测试汞的吸附能力时，在室温和pH为5.5时，可以获得足够高的Hg吸附能力，为每克吸附剂19.79 mg。

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  • 来源
    《Applied Surface Science》 |2011年第10期|p.4754-4759|共6页
  • 作者

    Bo Yune Song; Yujin Eom; Tai Gyu Lee;

  • 作者单位

    Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea;

    Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea;

    Department of Chemical and Biomolecular Engineering, Yonsei University, 262 Seongsanno, Seodaemun-gu, Seoul 120-749, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    Cobalt ferrite; Silica-CoFe_2O_4; Magnetic silica nanocomposite; Thiol; Mercury;

    机译：铁氧体钴Silica-CoFe_2O_4;磁性二氧化硅纳米复合材料;硫醇;汞;

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