钛酸锶钡纳米粉体的制备及其对铬(Ⅵ)和铬(Ⅲ)吸附性能  

Preparation of barium-stroutium titanate nano-powder and its adsorption properties for chromium(Ⅵ) and chromium(Ⅲ)

作　　者：张东[1] 苏会东[1] 高虹[1] 

机构地区：[1]沈阳理工大学环境与化学工程学院,辽宁沈阳110168

出　　处：《冶金分析》2007年第4期7-10,共4页Metallurgical Analysis

基　　金：沈阳市科学技术计划项目(1053090-2-06)

摘　　要：用草酸盐共沉淀法制备了高纯纳米钛酸锶钡粉体(BST),对其结构和对水中Cr(Ⅵ)和Cr(Ⅲ)的吸附性能进行研究。结果表明:该法合成的BST为棒状,是钙钛矿结构,平均粒径为36nm;常温下,pH<2.0时,Cr(Ⅵ)可被纳米BST定量吸附,而Cr(Ⅲ)不被吸附;当pH>13.0时,Cr(Ⅲ)可被纳米BST定量吸附,而Cr(Ⅵ)几乎不被吸附,因此,可以通过改变介质的pH值,实现Cr(Ⅵ)和Cr(Ⅲ)的吸附分离。吸附于纳米BST上的Cr(Ⅵ)和Cr(Ⅲ),分别用1mol/LNaOH溶液和0.2mol/L盐酸解脱,分别用分光光度法和原子吸收光谱法测定,检出限分别为0.00029mg/L和0.0046mg/L,用于水中Cr(Ⅵ)和Cr(Ⅲ)的分离富集,回收率为94.6%～97.1%,93.0%～95.4%。Nanometer-sized barium-stroutium titanate （BST） powder was prepared by using oxalate coprecipitateion, and its structure and adsorption characteristics for Cr（Ⅵ） and Cr（Ⅲ） in water were investigated. The results show that the forms of the BST powder are clubbed, perovskite, and its average partied diameter is 36 nm. At room temperature, Cr（Ⅵ） can be quantitively adsorbed on namometer BST powder when the pH is under 2.0, but Cr（Ⅲ） can＇t be adsorbed. When the pH exceeds 13, Cr（Ⅲ） can be adsorbed, but Cr（Ⅵ） can＇t be adsorbed. So Cr（Ⅵ） and Cr（Ⅲ） can be separated through changing pH value of medium. Cr（Ⅵ） and Cr（Ⅲ） adsorbed on the BST powder can be completely eluted using 1.0 mol/L NaOH and 0.2 mol/L HCl, respectively. And Cr（Ⅵ） and Cr（Ⅲ） were determined by spectrophotometry and FAAS respectively, with detection limit of 0. 000 29 mg/L for Cr（Ⅲ） and 0. 004 6 mg/L for Cr（Ⅵ）. The nano-powder has been applied to the preconcentration and separation of Cr（Ⅵ） and Cr（Ⅲ） in water samples with recoveries of 94.6% - 97.1% and 93.0% -95.4%.

关 键 词：钛酸锶钡纳米粉 制备 铬 价态分析 吸附性能 分离富集 

分 类 号：O647.31[理学—物理化学]