纳米二氧化钛对水中Sn(Ⅱ)、Sn(Ⅳ)和二丁基锡吸附性能的研究  

Adsorption Performance on Sn(Ⅱ),Sn(Ⅳ) and Dibutyltin in Water with Nanometer TiO_2

作　　者：黄泱[1] 郑凤英[2] 李顺兴[1] 黄邦钦[1] 

机构地区：[1]厦门大学环境科学研究中心,福建厦门361005 [2]漳州师范学院化学与环境科学系,福建漳州363000

出　　处：《分析科学学报》2008年第2期158-162,共5页Journal of Analytical Science

摘　　要：采用流动注射-氢化物发生-原子吸收光谱法研究纳米TiO2对Sn(Ⅱ)、Sn(Ⅳ)和二丁基锡(DBT)的吸附作用,探讨在不同pH值、吸附时间、试样浓度和试样体积下,不同用量的纳米TiO2的吸附效果以及试样的洗脱条件和效率。结果表明,Sn(Ⅱ)和Sn(Ⅳ)的浓度≤6.0μg/mL、体积≤500 mL、pH=3.0;DBT的浓度≤0.2μg/mL、体积≤50 mLp、H=4.0,30 mg纳米TiO2对Sn(Ⅱ)、Sn(Ⅳ)和DBT的吸附率≥90.0%。在25℃条件下,纳米TiO2对Sn(Ⅱ)、Sn(Ⅳ)和DBT的饱和吸附容量分别为23.6μg/mg、13.7μg/mg和0.628μg/mg,适用于无机锡和二丁基锡污染的吸附去除及对水中无机及丁基锡的定量富集。用4 mol/L HCl对吸附的Sn(Ⅱ)、Sn(Ⅳ)和DBT进行洗脱,洗脱率达到98%以上,可做为样品分析的前处理方法。The adsorption behaviors about different species of tin （Sn（ Ⅱ ）, Sn（Ⅳ）, and dibutyltin） in water on nanosize TiO2 were studied. After adsorption or elution, the concentration of Sn（ Ⅱ ）, Sn（Ⅳ） or dibutyltin （DBT） in filtrate or eluent was determined by flow injection-hydride generation-atomic adsorption spectrometry （FI-HG-AAS）. The influenceable factors, including pH value, concentration of adsorbate, absorption time, sample concentration , sample volume and amount of adsorbent were studied. The adsorptive ratio of Sn （Ⅱ）, Sn （Ⅳ） and DBT was more than 90. 0% under such experimental conditions as. （a） the concentration of Sn（ Ⅱ ） and Sn（Ⅳ） was less than 6.0 μg/mL, （b） the volume of solution was less than 500 mL, （c） pH value was 3. 0, and （d） the dosage of nanometer TiO2 was 30 mg. When the concentration of DBT was less than 0.2 μg/mL,the volume of solution was less than 50 mL , pH value was 4.0 and 30 mg nanometer TiO2 was used, the adsorptive rate of DBT was more than 90.0 % also. The adsorption capacities of Sn（ Ⅱ ）, Sn（Ⅳ） and DBT on nanometer TiO2 were 23.6 μg/mg, 13. 7 μg/mg and 0. 628 μg/mg, respectively. The elution ratios of adsorbed Sn（ Ⅱ ）, Sn（Ⅳ） and DBT with 4 mol/L HCl were all more than 98%. Nanometer TiO2 could be used for preconcentration of tin for the determination, and for rermoval of tin from water.

关 键 词：Sn(Ⅱ) Sn(Ⅳ) DBT 纳米TIO2 吸附行为 

分 类 号：O657.31[理学—分析化学]