Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (08): 2182-2188.doi: 10.3866/PKU.WHXB20100805

• COLLOID AND INTERFACE CHEMISTRY • Previous Articles     Next Articles

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).

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