高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (4): 742.

• 研究论文 • 上一篇    下一篇

聚丙烯酸在纳米TiO2表面吸附行为的研究

刘付胜聪, 肖汉宁, 李玉平   

  1. 湖南大学材料科学与工程学院, 长沙 410082
  • 收稿日期:2004-03-16 出版日期:2005-04-10 发布日期:2005-04-10
  • 通讯作者: 肖汉宁(1961年出生),男,教授,博士生导师,主要从事纳米材料和陶瓷材料研究.E-mail:hnxiao@hnu.cn E-mail:hnxiao@hnu.cn
  • 基金资助:

    湖南省科技攻关项目(批准号:03GKY3011)资助.

Adsorption Behavior of Poly(acrylic acid) on the Surface of Nanoparticulate Titanium Dioxide

LIUFU Sheng-Cong, XIAO Han-Ning, LI Yu-Ping   

  1. College of Materials Science and Engineering, Hunan University, Changsha 410082, China
  • Received:2004-03-16 Online:2005-04-10 Published:2005-04-10

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摘要： 讨论了聚丙烯酸在纳米TiO2水悬浮体系中的吸附行为.红外光谱分析和吸附实验结果表明,纳米TiO2通过氢键吸附PAA.PAA吸附量随着浓度的升高而增大直至饱和吸附量,且分子量越大,饱和吸附量越大.pH值增大,则饱和吸附量减小.在相同条件下,表面吸附层的厚度随PAA分子量、浓度和pH值增大而增大.这是由PAA在颗粒表面构型的变化所致.吸附PAA后的纳米TiO2的表面电荷密度和ζ电位发生变化,pHiep值向低值方向移动.表面吸附自由能的计算结果说明,PAA在纳米TiO2表面的吸附是自发过程.

关键词: 纳米二氧化钛, 吸附, 聚丙烯酸

Abstract: The adsorption of poly(acrylic acid) on the surface of titanium dioxide nanoparticles was investigated in aqueous suspensions. IR analysis and adsorption experimental results indicated the adsorption behavior was related to PAA mass concentration, pH value and molecular weight. Part of the PAA initially added to the suspension was adsorbed onto the particles surface after which there was a gradual attainment of adsorption plateau. The saturation amount would be higher for the higher PAA molecular weight. The quantity of adsorbed PAA decreased with increasing pH value of the suspension. The thickness of PAA adsorbed layers was calculated based on the measurements of the suspension viscosity in comparison with the viscosity of the polymer solution. It was proved that the adsorption layers thickness increased with the increase of PAA molecular weight, pH and concentration of PAA. The surface charge density and the measured ζ potential of TiO2 particles varied distinctly after PAA adsorption. The shift of pH<sup>iep of titanium dioxide towards lower pH value was observed in the presence of PAA. The calculated results of free energy of adsorption indicated that adsorption of PAA on the surface of titanium dioxide was a spontaneous behavior.

Key words: Titanium dioxide nanoparticles, Adsorption, Poly(acrylic acid)

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