摘要
Silica gels with a high specific surface area and high adsorption activity ,which have high selectivity and high adsorption capacity for zirconium in acidic high level radioactive liquid waste (HLLW), have been prepared from water-glass and hydrochloric acid through adding surfactants. The surfactant modifies the surface of the primary sol particles, thus suppresses the growth of the primary particle,but accelerates their agglomeration. The action of the surfactant is similar to that of the organic structure-directing agent and makes the sol cluster cross-linkage ring-like network in short order. The specific surface area of the silica gel is 998 m 2/g; the static adsorption capacity and the adsorption distribution coefficient for zirconium in HLLW are 32.6 mg/g and 56.1 mL/g, respectively.
以水玻璃和盐酸为原料 ,通过添加表面活性剂制备出高比表面、对高放射性废液中的锆具有高吸附容量的硅胶 .表面活性剂对初级溶胶粒子产生修饰作用 ,限制溶胶粒子的生长 ,但却促使溶胶粒子的连接 .因此 ,表面活性剂起到了无机结构导向剂的作用 ,并且促使溶胶粒子连接成网络结构 .该硅胶的比表面积可达 998m2 /g ,对锆的静态吸附量可达32 .6mg/g ,吸附分配系数为 5 6 .1mL/g .
基金
SupportedbyNationalAdvancedMaterialsCommitteeofChina(No. 863 71 5 0 0 4 2 2 0 )andNationalNaturalScienceFoundationofChina(No.2 9971 0 2 2 )
