乙二硫醇改性纳米二氧化硅颗粒用于选择性去除水体废水中的 Hg2+ 离子

Anandhu Mohan, Munusamy Ashwini, Madhappan Santhamoorthy, Kokila Thirupathi, Ranganathan Suresh, Loganathan Guganathan, Natarajan Arumugam, Abdulrahman I. Almansour, Mei-Ching Lin, Seong-Cheol Kim, Keerthika Kumarasamy, Thi Tuong Vy Phan
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摘要

使用 Pluronic P123 作为结构引导剂,通过溶胶-凝胶共凝结法将(3-缩水甘油氧丙基三甲氧基硅烷(GPTS))加入到介孔二氧化硅纳米粒子中,并通过后表面改性工艺进一步与乙二硫醇(ED)反应,合成了介孔二氧化硅纳米粒子。为了制备乙二硫醇改性的纳米二氧化硅颗粒,通过四乙基正硅酸盐和 GPTS 混合物(80:20 wt/wt%)反应,将约 20 wt% 的 GPTS 加入介孔二氧化硅孔壁。然后,通过与 GPTS 的环氧部分和 ED 的硫醇基团反应,将乙二硫醇基团引入二氧化硅表面,从而制备出 ED 改性介孔二氧化硅吸附剂(MS-ED NPs)材料。合成的 MS-ED NPs 具有较高的表面积、孔径和介孔体积,分别约为 556 m2/g、2.7 nm 和 0.052 cm3/g。在其他竞争性金属离子存在的情况下,MS-ED NPs 能选择性地去除水溶液中的汞离子(Hg2+),吸附量为 168 mg/g,对初始金属离子溶液(100 mg/L)的去除率约大于 90%。将吸附金属的 MS-ED NPs 在酸性(0.1 M HCl)水溶液中处理后,可重复使用 5 次。因此,MS-ED NPs 可用于选择性去除水体废水中的 Hg2+ 离子。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Ethanedithiol-modified silica nanoparticles for selective removal of Hg2+ ions from aqueous wastewater
A mesoporous silica nanoparticle was synthesized by incorporating (3-glycidoxypropyl trimethoxysilane (GPTS)) via sol-gel co-condensation method using Pluronic P123 as structure directing agent and further reacted with ethanedithiol (ED) by post-surface modification process. To produce ethanedithiol-modified silica nanoparticles, approximately 20 wt% of GPTS was incorporated into the mesoporous silica pore walls by reacting tetraethyl orthosilicate and GPTS mixture (80:20 wt/wt%). Next, the ethanedithiol groups were introduced onto the silica surface by reacting with the epoxy part of GPTS and thiol groups of ED to produce the ED-modified-mesoporous silica adsorbent (MS-ED NPs) material. The synthesized MS-ED NPs show a high surface area, pore size, and mesopore volume of approximately 556 m2/g, 2.7 nm, and 0.052 cm3/g, respectively. The MS-ED NPs showed selective removal of mercury ions (Hg2+) ions from the aqueous solution in the presence of other competitive metal ions with an adsorption amount of ∼168 mg/g with a removal capacity of approximately >90 % from the initial metal ion solutions (100 mg/L). The produced MS-ED NPs can be reusable up to 5 times by treating the metal-adsorbed MS-ED NPs in an acidic (0.1 M HCl) aqueous solution. Hence, the MS-ED NPs could be utilized to selectively remove Hg2+ ions from aqueous wastewater.
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