物理化学学报2011，Vol.27Issue(3)：677-682,6.
乙二胺改性磁性壳聚糖纳米粒子对酸性染料的吸附特性
Acid Dye Adsorption Properties of Ethylenediamine-Modified Magnetic Chitosan Nanoparticles
摘要
Abstract
Ethylenediamine-modified magnetic chitosan nanoparticles (EMCN) were prepared and used for the adsorption of Acid Orange 7 (AO7) and Acid Orange 10 (AO10) from aqueous solutions. Magnetic chitosan nanoparticles were prepared by adding a basic precipitant NaOH solution to a W/O microemulsion system containing cyclohexane/n-hexanol, chitosan and ferrous salt. This was then modified with ethylenediamine to increase the amine content and to improve the adsorption capacity. Transmission electron microscopy showed that the EMCN was essentially monodispersed and had a main particle size distribution of 15-40 nm. Adsorption experiments indicated that the maximum adsorption capacity was at a pH of 4.0 for AO7 and a pH of 3.0 for AO10. Because of the small diameter and the high surface reactivity of EMCN, the adsorption equilibrium for both dyes was reached very quickly. The equilibrium experiments fitted the Langmuir isotherm model well and the maximum adsorption capacities of 3.47 and 2.25 mmol·g-1 were obtained for AO7 and AO10, respectively. We estimated the thermodynamic parameters and accordingly the adsorption process was found to be spontaneous and exothermic. Additionally, we regenerated EMCN with an NH4OH/NH4CI solution (pH 10.0) and the regenerated material was used to readsorb the dyes.关键词
吸附/壳聚糖/磁性纳米粒子/乙二胺/酸性染料Key words
Adsorption/Chitosan/Magnetic nanoparticle/Ethylenediamine/Acid dye分类
化学化工引用本文复制引用
周利民,尚超,刘峙嵘..乙二胺改性磁性壳聚糖纳米粒子对酸性染料的吸附特性[J].物理化学学报,2011,27(3):677-682,6.基金项目
The project was supported by the Science & Technology Pillar Program of Jiangxi,China (2009BSB08600) and Scientific Research Fund from the Education Bureau of Jiangxi,China (GJJ10494) （2009BSB08600）
江西省科技支撑项目(2009BSB08600)和江西省教育厅科技项目(GJJ10494)资助 （2009BSB08600）
