物理化学学报 >> 2010, Vol. 26 >> Issue (08): 2182-2188.doi: 10.3866/PKU.WHXB20100805

胶体及界面化学 上一篇    下一篇

超高交联树脂对壬基酚聚氧乙烯醚的吸附机理

杨维本, 任丽   

  1. 南京师范大学化学与环境科学学院, 南京 210097
  • 收稿日期:2010-02-22 修回日期:2010-04-01 发布日期:2010-07-23
  • 通讯作者: 杨维本 E-mail:yangwb007@njnu.edu.cn
  • 基金资助:

     国家自然科学基金(50978137)和江苏省自然科学基金(BK2008436)资助项目

Adsorption Mechanism of Nonylphenol Polyethoxylate onto Hypercrosslinked Resins

YANG Wei-Ben, REN Li   

  1. College of Chemistry and Environment Science, Nanjing Normal University, Nanjing 210097, P. R. China
  • Received:2010-02-22 Revised:2010-04-01 Published:2010-07-23
  • Contact: YANG Wei-Ben E-mail:yangwb007@njnu.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50978137) and Natural Science Foundation of Jiangsu Province, China (BK2008436).

摘要:

研究了壬基酚聚氧乙烯醚(NPEO-10)在3种具有不同比表面积和孔径大小的超高交联树脂上的吸附行为与机理. 3种超高交联树脂对壬基酚聚氧乙烯醚的吸附量受它们的比表面积和孔径大小以及溶液温度的影响. 壬基酚聚氧乙烯醚在3种超高交联树脂上的吸附等温线可以用Langmuir和双Langmuir模型很好地拟合, 而用Freundlich模型拟合则效果不好, 但这些拟合曲线都具有相似的形状. 热力学分析表明吸附过程主要表现为吸附质分子的疏水部分和吸附剂表面的作用以及吸附质分子在其表面形成胶束状的聚集体, 即分散的、单层及双层聚集体的混合分布. 吸附动力学曲线中的两个平台也证明了吸附过程存在单层和双层聚集体. 脱附研究为实现超高交联树脂吸附分离水溶液中的壬基酚聚氧乙烯醚提供了合适的操作条件.

关键词: 脱附, 壬基酚聚氧乙烯醚, 等温线, 树脂, 温度

Abstract:

The aim of this study was to determine the behaviors and mechanism of three hypercrosslinked polymers during the adsorption of nonylphenol ethoxylated decylether (NPEO-10) from aqueous solutions. The polymers were characterized to determine their specific surface areas, pore sizes, and elemental contents. The adsorption isotherms of NPEO-10 on the three polymers fit the Langmuir and double Langmuir models better than the Freundlich model, and the isotherm curves had similar shapes on a lg-lg scale. The amount of adsorbed NPEO-10 depends on the specific surface area, the pore size of the polymer, and the temperature of the solution. Thermodynamic analysis indicated that the adsorption process was characterized by an interaction of the hydrophobic part of the surfactant molecule with the surface of the polymer and by the formation of micelle-like aggregates on the surface of the polymer. A two-dimensional mixture consists of singly dispersed surfactant molecules and monolayered or bi-layered aggregates on the surface of the polymers. Adsorption dynamics confirmed that the adsorption process involved two plateaus which were related to the formation of a monolayer and a bi-layer. Finally, the elution processes were investigated to further establish the appropriate adsorption conditions for the purification of water containing NPEO-10.

Key words: Elution, Nonylphenol polyethoxylate, Isotherm, Resin, Temperature

MSC2000: 

  • O642