高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (10): 1566.

• 论文 • 上一篇    下一篇

流动注射分析在线研究Cr(Ⅵ)在纳米TiO2表面上的吸附动力学性质

马万红, 蔡汝秀, 林智信   

  1. 武汉大学化学学院, 武汉, 430072
  • 收稿日期:1998-02-24 出版日期:1998-10-24 发布日期:1998-10-24
  • 通讯作者: 蔡汝秀.
  • 作者简介:马万红,男,36岁,博士研究生,副教授,现在郑州大学工作.
  • 基金资助:

    国家自然科学基金(批准号:29775015)资助课题.

Studies on Adsorption Properties of Chromium(Ⅵ) on the Nanometer-size TiO2 Powders Surfaces Using On-line Flow-injection Analysis

MA Wan-Hong, CAI Ru-Xiu, LIN Zhi-Xin   

  1. College of Chemistry, Wuhan University, Wuhan, 430072
  • Received:1998-02-24 Online:1998-10-24 Published:1998-10-24

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摘要： 用溶胶-凝聚法在不同的水解和热处理条件下制备了纳米尺寸的TiO2微粉,所得的TiO2表面性质迥异,粒径从几个纳米到数百个纳米,晶型也由低温煅烧的锐钛型转成高温处理时的金红石型.利用流动注射微柱富集在线分析方法对Cr(Ⅵ)离子在纳米TiO2表面上的吸附动力学特性进行了原位表征.

关键词: 纳米TiO2, 吸附动力学性质, Cr(Ⅵ), 流动注射在线分析

Abstract: Various of nanometer-size TiO2 samples are prepared from TiCl4 under different hydrolysis and calcining treatment conditions, such as pH, surfactants, stabilizers and temperature. It has been found that powders heat-treated at the temperature below 450 ℃ are of anatase crystal structure with average grain size of less than 20 nm. Adsorption behavior of Cr(Ⅵ) ion on as-prepared powders, adsorption kinetics, pHcurves, adsorption isotherms and adsorption capacity are studied by flow-injection micro column system for preconcentration using spectrophotometric detection method. The results demonstrated that nanometer-size TiO2 possesses a significant capacity and exchange rate for adsorption of Cr(Ⅵ) ion(approximately 3080 μg/g and 8.6×103 s-1).

Key words: Nanometer-size TiO2, Adsorption kinetics properties, Chromium(Ⅵ), On-line flow injection analysis

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