物理化学学报 >> 2011, Vol. 27 >> Issue (03): 677-682.doi: 10.3866/PKU.WHXB20110314

催化和表面科学 上一篇    下一篇

乙二胺改性磁性壳聚糖纳米粒子对酸性染料的吸附特性

周利民1,2, 尚超1, 刘峙嵘1   

  1. 1. 东华理工大学核资源与环境国家重点实验室培育基地, 南昌 330013;
    2. 东华理工大学放射地质与勘探国防基础重点实验室, 江西 抚州 344000
  • 收稿日期:2010-12-08 修回日期:2010-12-22 发布日期:2011-03-03
  • 通讯作者: 周利民 E-mail:minglzh@sohu.com
  • 基金资助:

    江西省科技支撑项目(2009BSB08600)和江西省教育厅科技项目(GJJ10494)资助

Acid Dye Adsorption Properties of Ethylenediamine-Modified Magnetic Chitosan Nanoparticles

ZHOU Li-Min1,2, SHANG Chao1, LIU Zhi-Rong1   

  1. 1. State Key Laboratory Breeding Base of Nuclear Resources and Environment, East China Institute of Technology, Nanchang 330013, P. R. China;
    2. Key Laboratory of Radioactive Geology and Exploration Technology Fundamental Science for National Defense, East China Institute of Technology, Fuzhou 344000, Jiangxi Province, P. R. China
  • Received:2010-12-08 Revised:2010-12-22 Published:2011-03-03
  • Contact: ZHOU Li-Min E-mail:minglzh@sohu.com
  • Supported by:

    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).

摘要:

利用乙二胺改性磁性壳聚糖纳米粒子(EMCN)吸附酸性橙7 (AO7)和酸性橙10 (AO10). EMCN制备时先通过在由环已烷/正已醇、壳聚糖和铁盐组成的反相微乳体系中加NaOH溶液沉淀剂, 得到磁性壳聚糖纳米粒子, 再经乙二胺改性以增加氨基含量和提高吸附容量. 透射电镜表明, EMCN分散良好, 粒径15-40 nm. 吸附实验表明, AO7和AO10最佳吸附分别在pH 4.0和pH 3.0. EMCN具有粒径小和高表面活性, 因此吸附速率快. 吸附平衡符合Langmuir模型, AO7和AO10的最大吸附容量分别为3.47和2.25 mmol·g-1. 热力学分析表明吸附过程放热, 且能自发进行. EMCN可用NH4OH/NH4Cl (pH 10.0)溶液再生并可重复使用.

关键词: 吸附, 壳聚糖, 磁性纳米粒子, 乙二胺, 酸性染料

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/NH4Cl solution (pH 10.0) and the regenerated material was used to readsorb the dyes.

Key words: Adsorption, Chitosan, Magnetic nanoparticle, Ethylenediamine, Acid dye

MSC2000: 

  • O647.3