Adsorption of lambda-Cyhalothrin onto Macroporous Polymer Foams Derived from Pickering High Internal Phase Emulsions Stabilized by Halloysite Nanotube Nanoparticles
Year: 2016
Journal: Acta Phys.-Chim. Sin.
Authors: Chen, X; Pan, JM; Yan, YS
Macroporous polymer foams (MPFs) were prepared through oil-in-water (O/W) Pickering high internal phase emulsions (HIPEs) stabilized by the natural clay halloysite nanotube (HNT) nanoparticles with the addition of small amounts of the nonionic surfactant Tween 85. The resulting MPFs were characterized, and the results showed an open cell structure with interconnected pores and a hydrophilic surface with a suspended state in aqueous solution. These features were beneficial for the adsorption of pyrethroids. Moreover, the adsorption of A-cyhalothrin on MPFs was examined to determine the kinetic and equilibrium data of the adsorption process. The findings of the kinetic and equilibrium studies revealed that a pseudo-second-order kinetic model and the Langmuir isotherm were the best fitted models (R-2 > 0.99), implying that the process of adsorption is a monolayer and chemically reactive. In addition, the maximum adsorption capacity and equilibrium time for A-cyhalothrin on MPFs were estimated to be 23.98 mu mol. g(-1) and 240 min at 298 K. Increasing the temperature led to an increase in adsorption capacity. Increasing the initial concentration of A-cyhalothrin led to an increase in clear adsorption capacity. Finally, the suspended MPFs represent a promising and reliable adsorbent for the removal of hydrophobic organic pollutants from aqueous solutions.
