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  • Title: Surface grafted silica adsorbent for efficient removal of Hg2+ ions from contaminated water.
    Author: Santhamoorthy M, Thirupathi K, Thirumalai D, Aldawood S, Kim CC.
    Journal: Environ Res; 2022 Sep; 212(Pt A):113211. PubMed ID: 35367425.
    Abstract:
    A mesoporous silica hybrid functionalized with aromatic 1,2-phenyl dithiol (PT@MS NPs) was prepared in two steps such as sol-gel co-condensation of VTMS and tetraethyl orthosilicate (TEOS) using Pluronic P123 as a structure directing surfactant, and surface grafting reaction of 1,2-phenyl dithiol with vinyl groups via click-reaction. Surface area, average pore size, and mesopore volume of the produced PT@MS NPs are approximately 546 m2/g, 2.8 nm, and 0.63 cm3/g, respectively. With an adsorption quantity of 252 mg/g and a removal capacity of nearly 95% from the initial metal ion (100 mg/L of Hg2+ ions) solutions, the PT@MS NPs material showed highly selective adsorption of mercury (Hg2+) from a mixture of other competitive metal (Zn2+, Ni2+, Pb2+, Cd2+, and Fe2+) ions. By treating the adsorbent with an acidic aqueous solution (0.1 M HCl), the produced adsorbent can be recycled and reused up to five times. As a result, the PT@MS NPs adsorbent might be used in wastewater treatment as a highly efficient and selective adsorbent for harmful Hg2+ ions.
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