碱矿渣-黏土复合胶凝材料水化物粉体对铯离子的吸附(英文)

CESIUM ION ADSORPTION IN HYDRATED PASTE POWDER FROM ALKALI-ACTIVATED SLAG-CLAY COMPOSITE CEMENTITIOUS MATERIAL

研究了碱矿渣黏土复合胶凝材料(alkali-activated slag clay composite cementitious material,AASCM)水化物粉体对模拟放射性核素Cs+的吸附性能及其影响因素。将AASCM水化物粉体的吸附性能和硅酸盐水泥、铝酸盐水泥、矿渣硅酸盐水泥水化粉体的吸咐性能进行对比。结果表明:实验条件下,母液浓度提高,AASCM水化物粉体对Cs+的吸附量增大,吸附比减小。温度升高,吸附平衡时间缩短,Cs+吸附量和吸附比下降。pH值下降,Cs+吸附量下降。Cs+在AASCM粉体中的吸附在一定浓度范围内服从Freundlich吸附等温方程且为放热过程。AASCM水化物粉体较硅酸盐水泥、铝酸盐水泥和矿渣硅酸盐水泥具有更强吸附Cs+的能力。

Adsorption properties of simulated radionuclide Cs^＋ in hydrated paste powder （HPP） from alkali activated slag-clay composite cementitious material （AASCM） and the factors influencing them were studied and the adsorption property of HPP from AASCM was compared with those from portland cement （PC）, aluminate cement （AC） and portland blast-furnace slag cement （PSC）. The results reveal that, under the experimental conditions, the Cs^＋ adsorption capacity in HPP from AASCM increases and its distribution ratio decreases with the increase of initial Cs^＋ concentration. The adsorption equilibrium time shortens and the adsorption capacity and distribution ratio decrease with the increase of the temperatures. Within a certain range of initial Cs^＋ concentration, the adsorption isothermal curve of Cs^＋ in HPP from AASCM conforms to the Freundlich formula, and the adsorption process is exothermal. The adsorption capacity decreases with the decrease of pH values. Cesium ion adsorption in HPP from AASCM is more powerful than those from PC, AC or PSC.