南京工业大学学报（自然科学版）2017，Vol.39Issue(6)：52-58,7.DOI:10.3969/j.issn.1671-7627.2017.06.009
蒙脱土壳聚糖磁性微球对Cr(Ⅵ)的吸附性能
Adsorption of Cr( Ⅵ) by montmorillonite/chitosan magnetic microspheres
摘要
Abstract
The montmorillonite-chitosan magnetic microspheres were prepared by ionic cross-linked method, with chitosan, Fe3 O4 and montmorillonite as the raw material, sodium tripolyphosphate and epichlorohydrin as the cross-linking reagent, and the adsorption of Cr (Ⅵ ) on the microspheres was investigated.It was found that the maximum adsorption for Cr(Ⅵ) occurred at pH=3,and the adsorption capacity increased with the increase of temperature; the adsorption isotherms and kinetics could be preferably fitted with the Langmuir model and the pseudo-second-order model. The negative value of ΔG (<0) and positive value of ΔH (>0) indicated the spontaneous and endothermic nature of adsorption. The saturated microspheres were desorbed by 01 mol/L NaOH.Adsorption capacity of Cr(Ⅵ) was 120 mg/g after five successive adsorption-regeneration cycles, which indicated that the adsorbent could be reused.关键词
壳聚糖/微球/吸附/再生Key words
chitosan/microspheres/adsorption/regeneration分类
资源环境引用本文复制引用
谢亚平,杨刚,邢卫红..蒙脱土壳聚糖磁性微球对Cr(Ⅵ)的吸附性能[J].南京工业大学学报（自然科学版）,2017,39(6):52-58,7.基金项目
国家科技支撑计划(2013BAE11B03) （2013BAE11B03）
