title: Dithiocarbamate-modified starch derivatives with high heavy metal adsorption performance.
abstract: In this work, three types of dithiocarbamate (DTC)-modified starch derivatives including DTC starch (DTCS), DTC enzymolysis starch (DTCES) and DTC mesoporous starch (DTCMS) were developed, which showed the significant heavy metal adsorption performance. The adsorption ability of these three DTC modified starch derivatives followed the sequences: DTCMS>DTCES>DTCS. In single metal aqueous solutions, the uptake amount of heavy metal ions onto the modified starches obeyed the orders: Cu(II)>Ni(II)>Cr(VI)>Zn(II)>Pb(II). The adsorption mechanism was proved by the chelating between DTC groups and heavy metal ions through the pH effect measurements. A monolayer adsorption of Langmuir isotherm model for the adsorption of Cu(II) onto DTCMS was well fitted rather than the multilayer adsorption of Freundlich isotherm model. The adsorption kinetics of Cu(II) onto starch derivatives was found to be fit well with the pseudo-second-order model. Additionally, in the presence of EDTA, the adsorption ability and uptake amount of heavy metal ions onto these three DTC modified starch derivatives is identical with the results obtained in the absence of EDTA.
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China. Electronic address: bxiangbo@tongji.edu.cn.
authors.forename: Bo
authors.initials: B
authors.lastname: Xiang
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China.
authors.forename: Wen
authors.initials: W
authors.lastname: Fan
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Yi
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China.
authors.forename: Zuohua
authors.initials: Z
authors.lastname: Wang
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China.
authors.forename: Feng
authors.initials: F
authors.lastname: Gao
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China.
authors.forename: Yijiu
authors.initials: Y
authors.lastname: Li
authors.affiliation: Shanghai Key Lab of Chemical Assessment and Sustainability, Department of Chemistry, Tongji University, Shanghai 200092, PR China. Electronic address: hongbogu2014@tongji.edu.cn.
authors.forename: Hongbo
authors.initials: H
authors.lastname: Gu
keywords: Adsorption mechanism; Dithiocarbamate; Heavy metal ions adsorption; Modified starch