title: Biosorption of multifold toxic heavy metal ions from aqueous water onto food residue eggshell membrane functionalized with ammonium thioglycolate.
abstract: A new biosorbent material from eggshell membrane was synthesized through thiol functionalization, which is based on the reduction of disulfide bonds in eggshell membrane by ammonium thioglycolate. The thiol-functionalized eggshell membrane was characterized, and its application as an adsorbent for removal of Cr(VI), Hg(II), Cu(II), Pb(II), Cd(II), and Ag(I) from aqueous water has been investigated. The experimental results revealed that the adsorption abilities of the thiol-functionalized eggshell membrane toward Cr(VI), Hg(II), Cu(II), Pb(II), Cd(II), and Ag(I) improved 1.6-, 5.5-, 7.7-, 12.4-, 12.7-, and 21.1-fold, respectively, compared with that of the eggshell membrane control. The adsorption mechanism and adsorption performance, including the adsorption capacity and the kinetics of the thiol-functionalized eggshell membrane for the target heavy metals, were investigated. The effects of solution pH, coexisting substances, and natural water matrices were studied. The thiol-functionalized eggshell membrane can be used as column packing to fabricate a column for real wastewater purification.
authors.affiliation: State Key Laboratory Breeding Base of Eco-Environments and Bio-Resources of the Three Gorges Reservoir Region, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China.
authors.forename: Sha
authors.initials: S
authors.lastname: Wang
authors.forename: Minghong
authors.initials: M
authors.lastname: Wei
authors.forename: Yuming
authors.initials: Y
authors.lastname: Huang
mesh_terms: D000327:Adsorption; D000818:Animals; D002462:Cell Membrane / Q000737:chemistry*; D002645:Chickens; D004528:Egg Shell / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D013864:Thioglycolates / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D019216:Metals, Heavy; D013864:Thioglycolates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C017487:2-mercaptoacetate