期刊
CHEMICAL ENGINEERING JOURNAL
卷 319, 期 -, 页码 229-239出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.03.015
关键词
Methylmercury sorption; Thiol-functionalized graphene oxide/Fe-Mn; 3-Mercaptopropyltrimethoxysilane (3-MPTS)
资金
- National Natural Science Foundation of China [41503085, 31270544]
- Scientific Research Foundation for Returned Overseas Chinese Scholars, Ministry of Education of China [[2015]1098]
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCYBJC53800]
- 863 achievement transformation program in Tianjin [14RCHZSF00144]
A novel thiol-functionalized graphene oxide/Fe-Mn composite (SGO/Fe-Mn) was synthesized via three different methods, i.e., acetic acid method (SGO/Fe-Mn-ac), neutral method (SGO/Fe-Mn-ne), and ammonium hydroxide method (SGO/Fe-Mn-am). The composites were characterized and tested for aqueous methylmercury removal. SGO/Fe-Mn was prepared using 3-mercaptopropyltrimethoxysilane (3-MPTS) as a silanizing reagent, and hydrolyzed 3-MPTS mainly interacted with GO/Fe-Mn through surface oxygen-containing groups (i.e., OH, C=O, epoxy C-O-C, carboxyl O=C-O, and C-O) and pi-pi interactions, partially through self-polymerization. SGO/Fe-Mn-am showed the largest hydrodynamic diameter, strongest pi-pi bond, fewest S oxidation products, most thiol groups, negative charge, spa defects, and FeOOH. Pseudo-second-order kinetic model and Langmuir and Freundlich isotherm models fitted well with methylmercury sorption kinetic and isotherm data, respectively, resulting in a CH3Hg+ maximum sorption capacity of 43.88 mg/g for SGO/Fe-Mn-am, 36.33 mg/g for SGO/Fe-Mn-ac, and 28.00 mg/g for SGO/Fe-Mn-ne. The removal mechanism was described by electrostatic attraction, ligand exchange, and surface complexation. This study demonstrates potential and viability of SGO/Fe-Mn for enhanced immobilization of CH3Hg+ in surface water, groundwater, and soil/sediments. (C) 2017 Elsevier B.V. All rights reserved.
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