化学学报 ›› 2005, Vol. 63 ›› Issue (4): 312-316. 上一篇    下一篇

研究论文

负载型纳米二氧化钛对重金属离子吸附性能的研究

刘艳,梁沛*,郭丽,卢汉兵   

  1. (华中师范大学化学学院 武汉 430079)
  • 收稿日期:2004-04-22 修回日期:2004-11-01 出版日期:2005-02-28 发布日期:2010-12-10
  • 通讯作者: 梁沛

Study on the Adsorption Behavior of Heavy Metal Ions on Nanometer TiO2 Supported on Silica Gel

LIU Yan,LIANG Pei*,GUO Li,LU Han-Bin   

  1. (College of Chemistry, Central China Normal University, Wuhan 430079)
  • Received:2004-04-22 Revised:2004-11-01 Online:2005-02-28 Published:2010-12-10
  • Contact: LIANG Pei

采用溶胶-凝胶法制备二氧化钛溶胶, 将其浸渍在硅胶上, 合成了负载型纳米二氧化钛材料, 以X射线衍射(XRD)、扫描电镜(SEM)等手段对其进行了表征. 以ICP-AES为检测手段, 系统地研究了负载型纳米TiO2材料对重金属离子Cd2+, Cr3+, Cu2+和Mn2+的吸附性能. 结果表明, 在pH 8~9范围内, 所研究的重金属离子均可被定量富集, 吸附的金属离子可用0.5 mol/L的HNO3完全解脱. 负载型纳米二氧化钛对Cd2+, Cr3+, Cu2+和Mn2+的静态吸附容量分别为8.3, 13.1, 12.6和5.1 mg/g, 与未负载的纳米二氧化钛相近. 将其应用于环境标准样品中Cd2+, Cr3+, Cu2+和Mn2+的分离富集与测定, 结果满意.

关键词: 溶胶-凝胶法, 负载型纳米二氧化钛, 吸附, 重金属离子, ICP-AES

Nanometer TiO2 supported on silica gel (supported nanometer TiO2) was prepared by Sol-Gel method. The product was characterized using XRD and SEM. The adsorption behavior of supported nanometer TiO2 towards Cd2+, Cr3+, Cu2+and Mn2+ was investigated by ICP-AES. It was found that the adsorption percentages of the metal ions studied were more than 90% in pH 8.0~9.0, and 0.5 mol/L HNO3 was sufficient for complete elution. The adsorption capacity of supported nanometer TiO2 for Cd2+, Cr3+, Cu2+and Mn2+ was found to be 8.3, 13.1, 12.6 and 5.1 mg/g, respectively. A method using supported nanometer TiO2 as adsorbent coupled with ICP-AES has been developed for the separation/preconcentration and determination of Cd2+, Cr3+, Cu2+and Mn2+in environmental sample.

Key words: sol-gel method, supported nanometer TiO2, adsorption, heavy metal ion, ICP-AES