实时合成水滑石分离模拟放射性核素锶的研究  

Separation of simulated radionuclide Sr by in-situ synthesis of hydrotalcite

作　　者：陆菲菲[1] 于少明[1] 邱勇[1] 乐金东[1] 王华林[1] 王祥科[2] 

机构地区：[1]合肥工业大学化学工程学院,合肥230009 [2]中国科学院等离子体物理研究所,合肥230031

出　　处：《环境科学学报》2012年第6期1388-1393,共6页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.20971033)~~

摘　　要：采用实时合成水滑石的方法从高放废液中分离模拟放射性核素锶,通过单因素实验并借助XRD分析确定了最佳分离实验条件,同时,运用FTIR、SEM等技术手段对合成的含锶水滑石的结构、形貌进行了分析.结果表明,当Sr2+初始浓度为70mg.L-1、pH值为10.5、n(Mg+Sr)/n(Al)为3时,锶的去除率最高可达95%以上;XRD和SEM分析结果表明,锶嵌入了水滑石的晶格中,合成的含锶水滑石形貌为层状六边形;含锶水滑石煅烧产物主要为尖晶石,且煅烧产物中未见氧化锶,表明嵌入到水滑石晶格中的锶在煅烧后存在于尖晶石的晶体结构中.The simulated radionuclide strontium was separated from the high level liquid waste by in-situ synthesis of hydrotalcite （HT）. The optimum conditions of the removal of strontium were determined by the single factor test and XRD analysis. The structure and morphology of Sr-containing hydrotalcite were analyzed by FTIR and SEM. The results showed that when the initial Sr^2＋ concentration was under 70 mg·L ^-1 , pH value was 10.5 and （ Mg ＋ Sr）/ AI ratio was 3, the strontium removal rate could reach more than 95%. Sr was embedded into the crystal lattice of HT and the morphology of St-containing hydrotalcite was layered hexagonal shape. The major calcined product of Sr-containing hydrotalcite was spinel without SrO which indicated that Sr-embedded crystal lattice of HT occurred in the structure of spinel.

关 键 词：水滑石 实时合成 高放废液 锶 分离 

分 类 号：X703.1[环境科学与工程—环境工程]