FTIR analysis of adsorption of poly diallyl-dimethyl-ammonium chloride on kaolinite

来源期刊：中南大学学报(英文版)2008年第3期

论文作者：孙伟 刘文莉 胡岳华

文章页码：373 - 377

Key words：adsorption; FTIR spectrum; kaolinite; poly diallyl-dimethyl-ammonium chloride; electrostatic; flocculant

Abstract: The flocculation behavior of ultrafine kaolinite suspension was investigated through settlement tests and FTIR method was employed to probe the adsorption mechanism of flocculant on kaolinite. The results show that the maximum settling rate of kaolinite occurs at pH value of 3.33, which is close to the point of zero charge(PZC) of kaolinite (3.5). This result is in good agreement with the double electric layer theory. Kaolinite suspension reaches the largest settling rate at a low concentration of 39 g/t for poly diallyl-dimethyl-ammonium chloride(PDADMA) flocculant, whereas for polyacrylamides(PAM) the dosage is required to be 500 g/t. When macromolecule polymer is adsorbed on surface, kaolinite particles may be flocculant due to the bridging effect. There are cation flocculant characteristic bands on the spectrum of kaolinite but no obvious shifting. Thus, the adsorption of poly diallyl-dimethyl-ammonium chloride on kaolinite surface is physical adsorption.

基金信息：the Major State Basic Research Development Program of China