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Acta Chimica Sinica ›› 2004, Vol. 62 ›› Issue (4): 429-432. Previous Articles     Next Articles

Zn-Al类水滑石零净电荷点及等电点研究

李丽芳1,2, 侯万国1, 戴肖南1, 刘春霞1   

  1. 1. 山东大学胶体与界面化学教育部重点实验室, 济南, 250100;
    2. 山东农业大学应用化学与材料科学学院, 泰安, 271018
  • 投稿日期:2003-05-19 修回日期:2003-10-10 发布日期:2014-01-26
  • 通讯作者: 侯万国,E-mail:wghou@sdu.edu.cn E-mail:wghou@sdu.edu.cn
  • 基金资助:
    国家自然科学基金(No.20273041)和教育部跨世纪人才基金资助项目.

Studies of the Point of Zero Net Charge and Isoelectric Point of Zn-Al Hydrotalcite-like Compounds

LI Li-Fang1,2, HOU Wan-Guo1, DAI Xiao-Nan1, LIU Chun-Xia1   

  1. 1. Key Laboratory of Colloid and Interface Chemistry, Shandong University, Jinan 250100;
    2. College of Applied Chemistry and Material Science, Shandong Agriculture University, Tai'an 271018
  • Received:2003-05-19 Revised:2003-10-10 Published:2014-01-26

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A series of Zn-Al hydrotalcite-like compounds (HTlc) was synthesized by co-precipitation method. The structure and chemical composition of the samples were determined by X-ray powder diffraction and automatic X-ray fluorescent spectrometric analysis, respectively. The results showed that pure HTlc could be obtained in the range of 0 31≤x≤0 52[x=n(Al)/n<(Zn+Al)]. The point of zero net charge (PZNC) and isoelectric point (IEP) of pure Zn-Al HTlc were measured using potentiometric titration method and electrophoretic method, respectively. The results indicated that permanent charge led to shifts in the PZNC and IEP of HTlc samples, and this influence was just the same as that of the cations adsorption on HTlc samples. PZNC and IEP all decreased with x or permanent charge density increasing, and IEP values were higher than PZNC values for all samples. The difference value (IEP- PZNC) increased as x value increased, indicating that the difference came from the structure charge of HTlc samples.

Key words: hydrotalcite2like compound, layered double hydroxide, isoelectric point, the point of zero net charge, potentiometric titration