title: Functionalized graphene as a nanostructured membrane for removal of copper and mercury from aqueous solution: a molecular dynamics simulation study.
abstract: The purpose of the present study was to investigate the removal of copper and mercury using functionalized graphene as a nanostructured membrane. The molecular dynamics simulation method was used to investigate the removal ability of these ions from aqueous solution using functionalized graphene membrane. The studied systems included a functionalized graphene membrane which was placed in the aqueous ionic solution of CuCl2 and HgCl2. An external electrical field was applied along the z axis of the system. The results indicated that the application of electrical field on the system caused the desired ions to pass through the functionalized graphene membrane. The Fluorinated pore (F-pore) terminated graphene selectively conducted Cu(2+) and Hg(2+) ions. The calculation of the potential of mean force of ions revealed that Cu(2+) and Hg(2+) ions face a relatively small energy barrier and could not pass through the F-pore graphene unless an external electrical field was applied upon them. In contrast, the energy barrier for the Cl(-) ion was large and it could not pass through the F-pore graphene. The findings of the study indicate that the permeation of ions across the graphene was a function of applied electrical fields. The findings of the present study are based on the detailed analysis and consideration of potential of mean force and radial distribution function curves.
authors.affiliation: Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-14766 Tabriz, Iran.
authors.forename: Jafar
authors.initials: J
authors.lastname: Azamat
authors.affiliation: Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-14766 Tabriz, Iran. Electronic address: a_khataee@tabrizu.ac.ir.
authors.forename: Alireza
authors.initials: A
authors.lastname: Khataee
authors.affiliation: School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, Republic of Korea. Electronic address: swjoo@yu.ac.kr.
authors.forename: Sang Woo
authors.initials: SW
authors.lastname: Joo
mesh_terms: D003300:Copper / Q000302:isolation & purification*; D006108:Graphite / Q000737:chemistry*; D006860:Hydrogen Bonding; D008628:Mercury / Q000737:chemistry*; D056004:Molecular Dynamics Simulation; D049329:Nanostructures / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D014874:Water Pollutants, Chemical; D006108:Graphite; D003300:Copper; D008628:Mercury
keywords: Desalination; Graphene; Molecular dynamics simulation; Nanostructured membrane; Potential of mean force