文献类型：期刊文献

英文题名：Synthesis of titanium cross-linked chitosan composite for efficient adsorption and detoxification of hexavalent chromium from water

作者：Zhang, Lingfan[1,2]; Xia, Wei[1]; Liu, Xin[1]; Zhang, Wenqing[1]

机构：[1] School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Research Center of Analysis and Test, East China University of Science and Technology, Shanghai, 200237, China

年份：2014

卷号：3

期号：1

起止页码：331

外文期刊名：Journal of Materials Chemistry A

收录：EI(收录号：20145000314874)

语种：英文

外文关键词：Chromium compounds - Isotherms - Chitosan - X ray photoelectron spectroscopy - Crosslinking - Titanium - Titanium compounds - Adsorption

摘要：For the simultaneous adsorption and detoxification of hexavalent chromium from water, a new titanium-chitosan (Ti-CTS) composite was synthesized through a metal-binding reaction between titanium ions and the chitosan biopolymer followed by cross-linking with glutaraldehyde. The resultant composite was characterized by FT-IR, XRD, elemental mapping, SEM and XPS. The adsorption properties toward Cr(vi) were systematically investigated as a function of pH, dosage, initial concentration, contact time, temperature and co-existing ions. Experimental data were well described by the Langmuir isotherm and the pseudo-second order model with the maximum adsorption capacity of 171 mg g-1. More attractively, the Cr(vi) could be effectively adsorbed and reduced to the less toxic Cr(iii) by the Ti-CTS composite. The experimental results, FT-IR and XPS indicated that the possible removal mechanism of Cr(vi) onto the Ti-CTS composite was summarized into three steps: (i) Cr(vi) adsorption by electrostatic attraction (Ti4+ and HCrO4-) and ligand exchange (Cl- and HCrO4-); (ii) Cr(vi) partly reduced to Cr(iii); (iii) the re-adsorption of Cr(iii) onto the Ti-CTS composite. This journal is ? 2015 The Royal Society of Chemistry.