超分散剂在莠去津颗粒表面吸附的XPS和SEM分析

XPS and SEM Spectroscopy Study of Hyperdispersant on Atrazine Surface

用X射线光电子能谱(X-ray photoelectron spectroscopy,XPS)研究了聚羧酸型梳状共聚物超分散剂吸附于莠去津颗粒样品表面的电子状态,计算了吸附厚度。结果表明,吸附分散剂后,莠去津颗粒界面的N(1s)和Cl(2p)谱峰强度明显减弱,Cl(2s)几乎消失,C(1s),O(1s)和Na(1s)谱峰强度则明显增强,这主要是分散剂中C,O和Na的贡献,且吸附分散剂后能在莠去津颗粒界面形成良好的吸附保护膜,其厚度约为24 nm。用扫描电子显微镜(scanning electron microscope,SEM)研究了样品表面形貌,研究发现吸附分散剂后莠去津颗粒变小、分布有序,使莠去津在水中能够获得稳定的悬浮性能。本文研究结果为莠去津环保剂型悬浮剂的应用提供了重要信息。

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（ls） 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（ls） increased obviously owing to the second emission of C, O, and Na from the dispersant molecule. After adsorp- tion, 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 al- lowed the atrazine particle to have a stable suspension property. This study provided significant information for the application of environment friendly atrazine suspension concentrate.