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

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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.

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Authors and Affiliations

  1. School of Resource Processing and Bioengineering, Central South University, Changsha, 410083, China

    Wei Sun  (孙 伟), Wen-li Liu  (刘文莉) & Yue-hua Hu  (胡岳华)

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  1. Wei Sun  (孙 伟)
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  2. Wen-li Liu  (刘文莉)
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  3. Yue-hua Hu  (胡岳华)
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Correspondence to Yue-hua Hu  (胡岳华).

Additional information

Foundation item: Project(2005CB623701) supported by the Major State Basic Research Development Program of China

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Sun, W., Liu, Wl. & Hu, Yh. FTIR analysis of adsorption of poly diallyl-dimethyl-ammonium chloride on kaolinite. J. Cent. South Univ. Technol. 15, 373–377 (2008). https://doi.org/10.1007/s11771-008-0070-3

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  • DOI: https://doi.org/10.1007/s11771-008-0070-3

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