摘要
采用溶胶凝胶法制备氧化铝负载纳米钛酸锶(AST),并用扫描电子显微镜和X射线衍射仪进行表征。研究AST对水中Cr(Ⅵ)和Cr(Ⅲ)的吸附性能,考察吸附剂的再生及Cr(Ⅵ)和Cr(Ⅲ)的分离富集条件。结果表明:采用溶胶凝胶浸渍法,纳米钛酸锶粒子可牢固地负载于氧化铝表面,钛酸锶晶体平均粒径为22 nm。得到的新型纳米钛酸锶吸附材料对水中Cr(Ⅵ)和Cr(Ⅲ)均具有较强的吸附富集能力,但其吸附性能取决于介质的pH值,可通过改变介质的pH值,实现Cr(Ⅵ)和Cr(Ⅲ)的吸附分离。吸附于AST上的Cr(Ⅵ)和Cr(Ⅲ),可分别用洗脱剂洗脱,采用原子吸收光谱法分别测定,据此建立水中铬形态分离富集新方法。该方法用于水中Cr(Ⅵ)和Cr(Ⅲ)的分离富集和原子吸收测定,结果满意。
Nanometer-strontium titanate immobilized on aluminum oxide （AST） was successfully prepared by the sol-gel method and characterized using scanning electron microscope （SEM） and X-ray diffraction （XRD）. By means of the determination of flame atomic absorption spectrometry （ FAAS ）, the adsorption characteristics of Cr （ VI ） and Cr （ IU ） on the AST were investigated. The results show that the nanometer-strontium titanate was immobilized on the aluminum oxide firmly, gaining a new sort of adsorbent, and the average partied diameter of strontium titanate is 22 nm. At normal temperature, Cr （ VI ） and Cr（ Ⅲ ） can be separated through changing pH value of medium. Cr（ VI ） and Cr（VI） adsorbed on the AST can be complete elution respectively. Cr（ VI ） and Cr（ Ⅲ ） were determined using FAAS. According to this, a new method was found to concentrate and separatechromium in water. The method has been applied to the preconcentration and separation of Cr（ VI ） and Cr（ Ⅲ ） in water samples with satisfactory results.
出处
《沈阳理工大学学报》
CAS
2012年第6期22-26,共5页
Journal of Shenyang Ligong University
关键词
纳米钛酸锶
氧化铝
铬
价态分析
分离富集
nanometre-stroutium titanate
aluminum oxide
chromium
speciation analy-sis
preconcentration and separation
