本文采用间歇法研究了浙江缙云沸石在不同环境条件下(浓度、pH值、介质、温度)对Cs+ 的吸附性能,并对吸附Cs+后的沸石用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.实验表明:该沸石对Cs+的平衡吸附量最高能达到173 mg/g,对Cs+的吸附平衡时间约为5 d.Cs+溶液的浓度和温度对该沸石的吸附性能影响比较大,其次是介质和溶液的pH值.该沸石对Cs+的平衡吸附量随Cs+溶液浓度的升高而增大,但平衡吸附率和平衡吸附比随着溶液浓度的增大而降低.pH值增大时,该沸石对Cs+的吸附性能也略有提高.在介质1、2、3中该沸石对Cs+的吸附性能依次提高,而在介质4中吸附性能最差,这与溶液中含离子种类、浓度以及其他成分的不同而有差异.在25 ℃条件下该沸石对Cs+的吸附性能比较好,而在其他温度条件下对Cs+的吸附性能要差一些.吸附Cs+后的沸石的晶胞体积在多数情况下减小,晶胞参数β变大,晶胞参数a、b、c变化不规则.
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