title: Synthesis and evaluation of a thiourea-modified chitosan derivative applied for adsorption of Hg(II) from synthetic wastewater.
abstract: In this work, a thiourea-modified chitosan derivative (TMCD) was synthesized through two steps, O-carboxymethylated first and then modified by a polymeric Schiff's base of thiourea/glutaraldehyde. The adsorption behavior of mercury (II) ions onto TMCD was investigated through batch method. The maximum adsorption capacity for Hg(II) was found to be 6.29 mmol/g at pH 5.0 and both kinetic and thermodynamic parameters of the adsorption process were obtained. The results indicated that adsorption process was spontaneous exothermic reaction and kinetically followed pseudo-second-order model. The adsorption experiments also demonstrated TMCD had high adsorption selectivity towards Hg(II) ions when coexisted with Cu(II), Zn(II), Cd(II) and Ca(II) in solution and it could be easily regenerated and efficiently reused.
authors.affiliation: Institute of Oceanology, The Chinese Academy of Sciences, Qingdao 266071, China. wanglin@ms.qdio.ac.cn
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Ronge
authors.initials: R
authors.lastname: Xing
authors.forename: Song
authors.initials: S
authors.lastname: Liu
authors.forename: Shengbao
authors.initials: S
authors.lastname: Cai
authors.forename: Huahua
authors.initials: H
authors.lastname: Yu
authors.forename: Jinhua
authors.initials: J
authors.lastname: Feng
authors.forename: Rongfeng
authors.initials: R
authors.lastname: Li
authors.forename: Pengcheng
authors.initials: P
authors.lastname: Li
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D048271:Chitosan / Q000138:chemical synthesis* / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008628:Mercury / Q000302:isolation & purification*; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013816:Thermodynamics; D013890:Thiourea / Q000737:chemistry*; D013997:Time Factors; D014865:Waste Disposal, Fluid; D018508:Water Purification / Q000379:methods*
chemical_list: D048271:Chitosan; D008628:Mercury; D013890:Thiourea