凹凸棒石对核素Sr^(2+)的吸附性能与结构表征  

Adsorption Capacity and Structure Characterization of Palygorskite on Sr^(2+)

作　　者：王金明[1] 易发成[2] 

机构地区：[1]安徽理工大学化工学院,淮南232001 [2]西南科技大学,绵阳621010

出　　处：《硅酸盐通报》2013年第5期921-926,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(10376028)资助项目

摘　　要：本文采用间歇法研究了凹凸棒石在不同环境条件下(浓度、介质、pH值、温度)对Sr2+的吸附性能,并对吸附Sr2+后的凹凸棒石用XRD表征和分析,为评价中低放核废物处置效果提供一些参考依据。结果表明:凹凸棒石对Sr2+的平衡吸附量随Sr2+溶液的浓度升高而增大,而平衡吸附率和平衡吸附比随溶液的浓度增大而降低。凹凸棒石对Sr2+的吸附性能随pH增大而提高。在介质1中,凹凸棒石对Sr2+的吸附性能最好,在介质3、2、4中对Sr2+的吸附性能依次降低。在303 K以上时,凹凸棒石对Sr2+的吸附性能随温度升高而提高。吸附Sr2+后的凹凸棒石的晶胞参数a增大,晶胞参数b减小,其它晶胞参数变化在不同条件下各有规律。The paper studied adsorption capacity of Sr2＋ on palygorskite in a few conditions including concentration,pH value,medium and temperature with the intermittence method and XRD characterization and analysis of palygorskite adsorbed Sr2＋ and offered some reference for valued mid-lower radioactive waste disposal.Result showed that equilibrium adsorptive quantity of Sr2＋ of palygorskite increased,equilibrium adsorptive rate and equilibrium adsorptive ratio decreased with the rise of solution concentration of Sr2＋.Adsorptive capacity of Sr2＋ of palygorskite heightened with the augment of pH value.Adsorptive capacity of Sr2＋ of palygorskite was the best in medium 1,that of Sr2＋ decreased by turn in medium 3,2,4.Adsorptive capacity of Sr2＋ of palygorskite increased with the rise of temperature by the beyond of 303 K.Unit cell parameter a of palygorskite adsorbed Sr2＋ increased and that b decreased under all conditions and that c,β and unit cell cubage were irregular.

关 键 词：凹凸棒石 吸附性能 Sr2+ 表征 

分 类 号：TQ174[化学工程—陶瓷工业]