Adsorption Properties of Comb-shaped Copolymer of Polycarboxylic Acid Superplasticizer on the Interface of Fipronil Particles

doi:10.7503/cjcu20121138

Abstract

Abstract:

The main methods in performing the study of the adsorption properties of hyperdispersant on fipronil interface were UV-Vis, FTIR, XPS and SEM. The kinetics and the thermodynamics of TERSPERSE^®2700 adsorption on fipronil were studied, and the results suggested that the adsorption of TERSPERSE^®2700 on the interface of fipronil particles was correspond with Langmuir equilibrium. The low activation energy of 29.28 kJ/mol suggested that it was a physical adsorption process. The free energy of the adsorption at all temperatures were negative indicating a spontaneous process. The peak intensity of F_1s, N_1s and Cl_2p of the interface of fipronil particle decreased obviously. The adsorption layer thickness of TERSPERSE^®2700 on the fipronil interface was measured through the XPS spectrum and the results showed that the adsorption layer thicknesses of TERSPERSE^®2700 was about 1 nm. The results of the present study suggested there were hydrogen bonds between fipronil molecules and it was also the main force combining fipronil particles and the dispersant. The results of SEM showed that the fipronil particles became rougher and their dispersion was in good order after adsorption. This study provided a theoretical foundation for development of stable fipronil suspension concentrate and the spectroscopy quantitative analysis of it.

Key words: Fipronil, Superplasticizer, Adsorption property, Hydrogen bond, Micro characterization

CLC Number:

O647.3

TrendMD:

MA Chao, XU Yan, GUO Xin-Yu, LUO Xiang-Ren, WU Xue-Min. Adsorption Properties of Comb-shaped Copolymer of Polycarboxylic Acid Superplasticizer on the Interface of Fipronil Particles[J]. Chem. J. Chinese Universities, 2013, 34(6): 1441.

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Adsorption Properties of Comb-shaped Copolymer of Polycarboxylic Acid Superplasticizer on the Interface of Fipronil Particles

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