| 光谱学与光谱分析 |
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| XPS and SEM Spectroscopy Study of Hyperdispersant on Atrazine Surface |
| XU Yan1, SUN Bao-li2, MA Chao1, ZHANG Ping1, CAI Meng-ling1, WU Xue-min1* |
1. Department of Applied Chemistry, China Agricultural University, Key Laboratory of Pesticide Chemistry and Application, Ministry of Agriculture, Beijing 100193, China
2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract The authors studied the electronic condition of comb-shaped copolymer of polycarboxylic acid type hyperdispersant adsorbed on the surface of atrazine particles with X-ray photoelectron spectroscopy (XPS). The thickness of the adsorption was calculated. The results suggested that after adsorbing the dispersant, the peak intensity of N(1s) and Cl(2p) of the interface of atrazine particle decreased sharply, while the absorption of Cl(2s) almost diminished. Meanwhile the peak intensity of C(1s), O(1s) and Na(1s) increased obviously owing to the second emission of C, O, and Na from the dispersant molecule. After adsorption, the dispersant formed a favorable protecting membrane on the surface of atrazine particles whose thickness was about 24 nm. The authors also studied the surface state of the sample with scanning electron microscope (SEM). The results of which showed that after adsorption, the atrazine particles became smaller and their dispersion was in good order. These changes allowed the atrazine particle to have a stable suspension property. This study provided significant information for the application of environment friendly atrazine suspension concentrate.
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Received: 2010-12-10
Accepted: 2011-04-05
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Corresponding Authors:
WU Xue-min
E-mail: wuxuemin@cau.edu.cn
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