材料科学与工程学报2017，Vol.35Issue(4)：553-558,581,7.DOI:10.14136/j.cnki.issn 1673-2812.2017.04.008
黄原胶-丙烯酰胺接枝共聚物吸附Cu(Ⅱ)的热力学、动力学性质
Thermodynamics and Kinetics for Cu(Ⅱ) Adsorption by Graft Copolymer of Xanthan Gum and Acrylamide
摘要
Abstract
Graft copolymer of xanthan gum and acrylamide (XG-g-AM) was used to adsorb Cu (Ⅱ) from aqueous solution.Thermodynamics and kinetic characteristics of the adsorption process were investigated based on the adsorption experiment.The molecular structures of XG-g-AM before and after adsorption were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD).The results show that the adsorption pattern of XG-g-AM for Cu (Ⅱ) fits with both the Langmiur and Freundlich adsorption isotherm equation within the temperature range of 298～ 318K.Thermodynamic parameters,the change of free energy (ΔG),enthalpy (ΔH) and entropy (ΔS),indicate that the adsorption is a spontaneous,endothermic and entropy increase process.Moreover,temperature increase can benefit the adsorption.Kenetic experiments show that the adsorption process corresponds with pseudo-second order kinetic model.XG-g-AM adsorbs Cu (Ⅱ) by means of physical adsorption and coordination adsorption.The crystal structure of XG-g-AM was destroyed after adsorbing Cu (Ⅱ) and the crystallinity of XG-g-AM decreased.Cu (Ⅱ) congregate on XG-g-AM in the form of non crystalline state.关键词
接枝共聚物/吸附/Cu(Ⅱ)/热力学/动力学Key words
graft copolymer/adsorption/Cu(Ⅱ)/thermodynamic/kinetic分类
化学化工引用本文复制引用
程磊,程乐华,王新运..黄原胶-丙烯酰胺接枝共聚物吸附Cu(Ⅱ)的热力学、动力学性质[J].材料科学与工程学报,2017,35(4):553-558,581,7.基金项目
Education Committee of Anhui Province of China (KJ2016A503) （KJ2016A503）
