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.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
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
关键词
凹凸棒石
吸附性能
Sr2+
表征
palygorskite
adsorptive capacity
Sr2＋
characterization
