纳米Al_2O_3分离富集环境样品中的铊  

Separation and preconcentration of thallium(Ⅲ) from environmental samples by adsorption on nano-Al_2O_3

作　　者：黄婷[1] 

机构地区：[1]安康学院化学化工系,陕西安康725000

出　　处：《云南大学学报（自然科学版）》2012年第1期84-89,共6页Journal of Yunnan University(Natural Sciences Edition)

基　　金：安康学院科研资助项目(AYQDZR200933)

摘　　要：研究了纳米Al2O3对铊的吸附性能,考察了吸附热力学,最佳酸度和吸附容量.实验结果表明:在最佳pH条件下,铊定量、快速地被吸附在纳米Al2O3材料上;其2,20,40℃时最大吸附容量分别为4.44,5.78,6.28 mg.g-1;等温吸附线呈现可逆的Langmuir吸附形式.吸附反应的焓变ΔH0和熵ΔS0均为正值,ΔG0为负值,说明该过程是自发的吸热反应.被吸附在纳米Al2O3上的金属离子能采用1.00 mL 0.25 mol.L-1 HCl溶液定量洗脱,其回收率达到98%.该法对铊的检出限为0.84μg.L-1,相对标准偏差(RSD)为2.4%,已成功地应用于实际水样和多金属结核样品GBW07296的测定,分析结果令人满意.The adsorption behavior of nano - A12 O3 towardst thallium （T1） was investigated. The test includ- ed sorption thermodynamics, effect of pH on adsorption ratio, and adsorption capacity. Under the optimum condi- tions ,TI（ Ⅲ ） ions could be adsorbed and recovered quantitatively. The maximum adsorption capacity of thallium ions on nano - A1203 was 4.44,5.78 mg · g - 1, and 6.28 mg · g - 1 at 2,20 ℃ and 40 ℃, respectively. The Lang- muir model could describe the adsorption of nano -A1203 to TI（ Ⅲ ） ions successfully over the whole range of studied concentration. The value of standard enthalpy and standard entropy （ △H^0, △S^0〉 0） may be interpreted as the endothermic adsorption process. The negative value of AGO showed the adsorptions of TI（Ⅲ） by nano -A12O3 were a spontaneous process. For the elution of TI（ Ⅲ） ,the desorption percentage reached to 98% by 1.00 mL of 0.25 mol · L-1 HC1. Detection limits （3^0） of 0.84 μg· L-1 ,relative standard deviation of 2.4% level were ob- tained. The method has been successfully applied for determination of trace elements thallium in some environ- mental samples and the certified reference material （GBW07296） with satisfactory results.

关 键 词：纳米AL2O3 富集 铊 解吸附 

分 类 号：O652.6[理学—分析化学]