Citation: CHEN Xiang, PAN Jian-Ming, YAN Yong-Sheng. Adsorption of λ-Cyhalothrin onto Macroporous Polymer Foams Derived from Pickering High Internal Phase Emulsions Stabilized by Halloysite Nanotube Nanoparticles[J]. Acta Physico-Chimica Sinica, ;2016, 32(11): 2794-2802. doi: 10.3866/PKU.WHXB201609073 shu

Adsorption of λ-Cyhalothrin onto Macroporous Polymer Foams Derived from Pickering High Internal Phase Emulsions Stabilized by Halloysite Nanotube Nanoparticles

School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu Province, P. R. China

Received Date: 2 August 2016
Revised Date: 7 September 2016

Fund Project: The project was supported by the National Natural Science Foundation of China (21574091, 21576120) and National Postdoctoral Science Foundation, China (2013M540423).

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 λ-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 (R²>0.99), implying that the process of adsorption is a monolayer and chemically reactive. In addition, the maximum adsorption capacity and equilibrium time for λ-cyhalothrin on MPFs were estimated to be 23.98 μmol·g^-1 and 240 min at 298 K. Increasing the temperature led to an increase in adsorption capacity. Increasing the initial concentration of λ-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.
- Adsorption,
- Macroporous polymer foam,
- Halloysite nanotube,
- Kinetics,
- Pickering high internal phase emulsion
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