冻融法合成Sr高效吸附剂硅钛酸钠

Synthesis of High Efficient Absorbent for Sr by Freezing and Thawing Method

摘要: “冻融法”合成了高效除Sr吸附剂。经扫描电镜（SEM）、差示扫描量热仪（DSC）和热重分析（TG）等分析方法对吸附剂进行了形貌及成分表征。考察了吸附剂硅钛酸钠对非放射性模拟废液中Sr的去除能力，验证了硅钛酸钠对放射性废液中⁹⁰Sr的深度净化能力。实验结果显示，合成的硅钛酸钠对废液中Sr的吸附效果十分出色，在室温、pH=13的条件下，硅钛酸钠对非放模拟废液中Sr的吸附K_d值超过10⁵mL/g；同时所制备的吸附剂具有极强的耐盐性。“冻融法”制备吸附剂过程简单、产量大，适于工业化生产。

Abstract: In this paper, high efficient absorbent for Sr named crystalline silicontitanate was prepared through the “freezing and thawing” method. The morphology and composition of absorbent were characterized by SEM, DSC, TG and other analytical methods. The removal ability of Sr in non radioactive waste liquid was investigated, and the deep purification ability of ⁹⁰Sr in the high salt radioactive waste liquid was verified. When the pH of solution is 13, the crystalline silicontitanate has a very strong adsorption effect to Sr. The K_d value is larger than 10⁵ mL/g. And it is indicated that the absorbent has strong salt resistance. The “freezing and thawing” method is simple and has large output. It is suitable for industrial production.