Synthesis and Characterization of Immobilized Nanometer Calcium Titanate and the Application in Speciation Analysis for Chromium
(0) Nanometer calcium titanate immobilized on silica gel G (SGCTO) was prepared by the sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectrophotometry (FTIR). Its application in speciation of Cr(Ⅲ) and Cr(Ⅳ) from water was studied. Adsorption and elution were investigated under different conditions. The results showed that the nanometer calcium titanate was immobilized on the silica gel G firmly, becoming a new adsorbent. At normal temperature, two forms of chromium show different adsorption capacities at different pH values, that is, Cr (Ⅲ) selectively retained at pH 8-14, but Cr(Ⅳ) cant be adsorbed. Whereas Cr (Ⅳ) retained at pH 1, but Cr(Ⅲ) cant be adsorbed. Hence complete separation of the two forms of chromium is possible. Retained Cr(Ⅲ) and Cr(Ⅳ) were eluted with 1 mol·L-1 HC1 and 2 mol·L-1 NaOH, respectively. The Cr(Ⅲ) and Cr(Ⅳ) concentration was measured by atomic absorption spectroscopy. The method was successfully applied for the speciation of chromium in environmental water samples.
Adsorption agent Immobilized nano-calcium titanate Speciation Chromium
Dong Zhang
School of Environmental and Chemical Engineering,Shenyang Ligong University,Shenyang 110159,P.R.China
国际会议
2010 International Conference on Material and Manufacturing Technology(2010材料与制造技术国际会议 ICMMT2010)
重庆
英文
724-727
2010-09-17（万方平台首次上网日期，不代表论文的发表时间）