摘要
研究了以高岭土为原料合成的4A沸石的物化特性以及对放射性核素Co2+、Sr2+的吸附性能。结果表明:合成的4A沸石每100 g阳离子交换容量(CEC)达137.82 mmol,总孔体积6.25 cm3/g,比表面积232.5 m2/g,渗透系数8.7×10-4m/s,对Co2+、Sr2+的吸附效果均较好,优于天然沸石矿石材料。4A沸石对Co2+、Sr2+的吸附速度较快,吸附量随溶液初始浓度的增大而逐渐增大。溶液的pH值是吸附效果的主要影响因素,中性和碱性环境更有利于吸附作用的进行。4A沸石可作为核废料处置库中缓冲材料的候选材料。
Physicochemical properties of 4A zeolite which is produced by taken kaolin as raw material and adsorption to Co^2＋ and Sr^2＋ have been studied. The results show that 4A zeolite have a large cationic exchange capacity and the CEC value is 137.82 mmol/100 g, pore volume, 6.25 cm^3/g; specific surface area, 232.5 m^2/g ; coefficient of permeability, 8.7 × 10^-4 m/s. 4A zeolite have better adsorption to Co^2＋ and Sr^2＋ than natural zeolite minerals materials. 4A zeolite have a high adsoption rate to Co^2＋ and Sr^2＋. The adsorption amount increases with the preliminary concentration of solution. The pH value of solution has a distinct effect on adsorption and the neutral and alkaline condition are more beneficial to adsorption. 4A zeolite can be used as backfill materials of radioactive waste materials treatment.
出处
《西南科技大学学报》
CAS
2006年第3期1-4,18,共5页
Journal of Southwest University of Science and Technology
基金
国家自然科学基金资助项目(项目编号:10376028)
