负载型纳米二氧化钛对重金属离子吸附性能的研究  

Study on the Adsorption Behavior of Heavy Metal Ions on Nanometer TiO_2 Supported on Silica Gel

作　　者：刘艳[1] 梁沛[1] 郭丽[1] 卢汉兵[1] 

机构地区：[1]华中师范大学化学学院,武汉430079

出　　处：《化学学报》2005年第4期312-316,共5页Acta Chimica Sinica

摘　　要：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pH8～9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0.5mol/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5.1mg/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.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 8.0similar to9.0, 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.

关 键 词：负载型 纳米二氧化钛 吸附性能 钛材料 MN^2+ 研究 浸渍 CR^3+ CD^2+ 分离富集 

分 类 号：O647.3[理学—物理化学] TQ426[理学—化学]