沸石的转晶行为及其对Cs^+、Sr^(2+)吸附-脱附能力研究  

Study on the Crystal Transformation of the Zeolite and Its Adsorption-desorption Capacity for Cs^+ and Sr^(2+)

作　　者：郑聪[1] 李亚林[1] 黎博芝 马雪[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《绿色科技》2016年第8期134-137,共4页Journal of Green Science and Technology

基　　金：省级大学生创新创业训练计划资助项目(编号:20140619027);国家自然基金-青年基金(编号:11405140)

摘　　要：指出了沸石是一种具有优异的吸附、离子交换性能的硅铝酸盐矿物,在环境治理中有广泛的应用前景。主要研究了13X沸石、4A沸石和天然沸石在200℃水热条件下的转晶行为,对模拟核素离子C^s+、Sr^(2+)的吸附能力,及转晶后的沸石晶相阻滞核素离子发生脱附的能力进行了探究。结果表明:13X沸石和4A沸石转晶形成方钠石,而天然沸石转晶形成方沸石,且MgCl_2的加入将促进转晶行为的发生;13X沸石和4A沸石均对Cs^+、Sr^(2+)具有良好的吸附能力,吸附率大于90%,而天然沸石对Sr^(2+)的吸附率较低,仅为21.57%;方钠石作为转晶后的晶相能够减少离子的脱附,而钙霞石反而增加离子的脱附率。Zeolite is a kind of silica-aluminamineral with high adsorption capacityand selective ion-exchange property,and it demonstrates an extensive application prospectin environmental governance.The crystal transformation behaviors of 13 Xzeolite,4Azeolite and natural zeolite are investigated in hydrothermal condition at 200℃,and the adsorption capacity for simulation of radioactive ions Cs＋and Sr^（2＋）of zeolite and the desorption capacity for simulation of radioactive ions of transformed zeolite phase are also studied in this work.The results show that 13 Xzeolite and 4A zeolite are transformed into sodalities,and the natural zeolite is transformed into analcime.The addition of MgCl_2 can promote the crystal transformation process of zeolite.13 Xzeolite and 4Azeolite have high adsorption capacity for simulation of radioactive ions Cs＋and Sr^（2＋）,and the value of adsorption rate is more than 90%.However,the adsorption rate of natural zeolite for Sr^（2＋）is lowest in the experiment,the value is only 21.57%.Sodalite can reduce the desorption rate of zeolite for simulation of radioactive ions Cs＋and Sr2,but cancrinite increases the desorption rate.

关 键 词：沸石 转晶 方钠石 钙霞石 

分 类 号：O7[理学—晶体学]