二氧化钛对 Cu 2 + 的吸附研究

doi:10.16597/j.cnki.issn.1002-154x.2022.05.006

二氧化钛对 Cu²⁺ 的吸附研究

吴莉莉∗ 曹洪印

(南京科技职业学院,江苏 南京 210048)

Study on the Adsorption of Cu ^{2 +} onto TiO₂

Wu Lili ∗; Cao Hongyin;

(NanJing Polytechnic Institute, Jiangsu Nanjing 210048)

摘要:

研究了不同因素对二氧化钛(TiO₂ )吸附二价铜离子(Cu²⁺ )过程的影响。 吸附动力学数据证明 TiO₂ 对 Cu²⁺ 的吸附是化学吸附,假二级速率方程可以对数据很好地进行模拟。 体系中吸附剂浓度的增加可大大促进吸附过程的 进行。 体系 pH 值变化对吸附过程影响较大,但体系离子强度的变化影响甚微。 腐殖酸表面丰富的基团可促进 TiO₂ 对 Cu²⁺ 的吸附。 热力学数据证明较高的温度可以促进吸附过程的进行,且实验数据更适合于 Freundlich 模型。

关键词：二氧化钛 二价铜离子 吸附 腐殖酸

Abstract：

The influence of different factors on the adsorption process of Cu²⁺ by TiO₂ was studied. The adsorption kinetics data proved that the adsorption of Cu²⁺ by TiO₂ was chemisorption, and the pseudo-second-order rate equation could simulate the data well. The increase of adsorbent concentration in the system can greatly promote the adsorption process. The change of pH value has great influence on the adsorption process, but the change of ionic strength has little effect. The rich groups on the surface of humic acid can promote the adsorption of Cu²⁺ by TiO₂ . Thermodynamic data show that higher temperature can promote the adsorption process, and the experimental data are more suitable for Freundlich model.

Keywords：titanium dioxide; Cu ^{2 +}; adsorption; humic acid;