高等学校化学学报

高等学校化学学报

• 研究论文 • 上一篇    下一篇

纳米TiO2对Ag(I)配合物的吸附

张霞1, 赵月1, 周春彬2, 孙挺1   

    1. 东北大学理学院, 沈阳110004;
    2. 辽宁林业职业技术学院, 沈阳110101
  • 收稿日期:2008-06-03 修回日期:1900-01-01 出版日期:2009-01-10 发布日期:2009-01-10
  • 通讯作者: 张霞

Adsorption of Coordination Compound of Ag(I) on TiO2 Nanoparticles

ZHANG Xia1*, ZHAO Yue1, ZHOU Chun-Bin2, SUN Ting1   

    1. College of Sciences, Northeastern University, Shenyang 110004, China;
    2. Liaoning Forestry Vocational Technical College, Shenyang 110101, China
  • Received:2008-06-03 Revised:1900-01-01 Online:2009-01-10 Published:2009-01-10
  • Contact: ZHANG Xia

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摘要： 利用纳米TiO2的表面吸附活性, 以[S2O3]2-为络合剂, 应用火焰原子吸收光谱检测方法, 高效吸附分离了水中痕量Ag(Ⅰ). 系统研究了纳米TiO2的晶体结构、溶液的pH值、吸附时间、Ag(Ⅰ)的起始浓度及常见共存离子对吸附率的影响, 确定了最佳吸附条件. FTIR光谱分析结果表明, Ag(Ⅰ)配合物以物理作用吸附在纳米TiO2颗粒表面. 纳米TiO2对Ag(Ⅰ)的吸附等温线为S型, 表现出多分子层吸附特征. 硝酸和硫脲混合溶液可将吸附在TiO2纳米颗粒表面的Ag(Ⅰ)全部洗脱.

关键词: 纳米TiO2, 纳米吸附剂, 吸附等温线

Abstract: An efficient separation of coordination compound of Ag(Ⅰ) was carried out taking TiO2 nanoparticles as adsorbent, [S2O3]2- anion as ligand and Flame Atomic Absorption Spectrophometer(FAAS) as detector to determine the concentration of Ag(Ⅰ). The effect of the crystalline structure of TiO2 nanoparticles, pH values, adsorption time, initial concentration of Ag(Ⅰ), and some coexistent ion on the adsorption rate was systematically studied. The FTIR spectrum show that the coordination compound of Ag(Ⅰ) is physically adsorbed on the surface of TiO2 nanoparticles. The adsorption isotherm of Ag(Ⅰ) on nano-TiO2 show “S” type, which can be explained by the multi-molecular layer adsorption. The Ag(Ⅰ) adsorbed on TiO2 nanoparticles could be eluted completely by mixed solution of nitric acid(1 mol/L) and sulfourea(2 g/L). The above experiment results would be valuable for using the nano-adsorbents to separate trace Ag(Ⅰ) in waste water.

Key words: TiO2 nanoparticles, Nano-adsorbent, Adsorption isotherm

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