DB18C6/SiO_2复合材料对Zr(Ⅳ)和Hf(Ⅳ)吸附性能研究  

STUDIES ON ADSORPTION PROPERTIES OF DB18C6/SiO_2 COMPOSITE MATERIAL TOWARD Zr(Ⅳ) AND Hf(Ⅳ)

作　　者：车德华[1] 徐刚[1,2] 徐盛明[1,2] 

机构地区：[1]清华大学核能与新能源技术研究院,北京100084 [2]清华大学精细陶瓷北京市重点实验室,北京100084

出　　处：《矿冶》2015年第2期35-40,共6页Mining And Metallurgy

基　　金：国家自然科学基金项目资助(21071088)

摘　　要：通过溶液p H值、吸附动力学、吸附等温线、吸附热力学试验,考察了DB18C6/SiO2复合材料对水溶液中Zr(Ⅳ)和Hf(Ⅳ)的吸附行为。结果表明,25℃下,溶液p H值为1.5时该吸附材料对Zr(Ⅳ)和Hf(Ⅳ)的吸附量最大,且吸附过程符合准二级动力学方程;DB18C6/SiO2对Zr(Ⅳ)的吸附行为属于放热自发过程,吸附等温线符合Langmuir等温吸附模型;而对Hf(Ⅳ)的吸附行为属于吸热自发过程,吸附过程更符合Freundlich等温吸附模型。此外,文中还通过元素分析和N2吸附分析确定了该复合材料的冠醚键合量和比表面积。In this study, DB18C6/SiO2 composite material was used to adsorb Zr（1V） and Hf（IV） from water. Effects of media pH, adsorption dynamics, adsorption isotherms and adsorption thermodynamics were examined in the batch mode. The results indicated that at 25 ℃ , the maximum adsorption capacities of Zr（[V） and Hf（[V） were at- tained at pH 1.5, and the adsorption kinetics followed the mechanism of the pseudo-second-order equation. The adsorption for Zr（~/） was an exothermic and spontaneous progress and the isotherm adsorption followed the isothermal adsorption model of Langmuir. While the adsorption for Hf（IV） was an endothermic and spontaneous progress and the isotherm adsorption followed the isothermal adsorption model of Freundlich. Besides, the crown ether content and surface area of the composite material were characterized by Element Analysis and BET.

关 键 词：DB18C6/SiO2复合材料 吸附 Zr(Ⅳ) Hf(Ⅳ) 

分 类 号：TB332[一般工业技术—材料科学与工程] O614.41[理学—无机化学]