摘要
AMP(磷钼酸铵)是具有Keggin结构的十二钼磷杂多酸盐,对Cs^+具有良好的吸附性能。采用介孔分子筛SBA-15作为支撑材料制备了AMP/SBA-15复合材料,利用静态实验研究了AMP/SBA-15复合材料对^(137)Cs^+的吸附特征,考察了时间、初始浓度、竞争离子以及γ射线辐照对吸附效果的影响。实验结果表明在实验条件下,材料对^(137)Cs^+吸附平衡时间约为20min;当初始浓度为103Bq/L时,吸附率超过80%,随着初始浓度增加,吸附率增加;随着溶液中K^+浓度的增加,AMP/SBA-15对^(137)Cs^+的吸附率有所下降,但当K^+浓度高于^(137)Cs^+浓度七个数量级时,AMP/SBA-15对^(137)Cs^+仍有较好的选择性;当^(137)Cs^+初始浓度低于2×10~4Bq/L时,γ射线辐照对材料的吸附性能影响不明显。制备的AMP/SBA-15复合材料是一种有潜力的适用于中低水平放射性废水处理材料。
A composite adsorbent was prepared by immobilizing ammonium molybodophosphate( AMP) on mesoporous silica( SBA-15). The adsorption behavior of 137 Cs+on the composite material and different influence factors like time,initial concentration,com-peting ions and gamma irradiation were studied. Results showed that under the experimental conditions,the absorption could reach equilibrium in 20 mins. The adsorption efficiency could reach more than 80%when the initial 137 Cs+concentration was 103 Bq/L and it increases with higher initial 137 Cs+ concentrations. The existence of K+ had negative effect on the adsorption,as the concentration of K+ increased, the adsorption efficiency became decreased. However, the adsorption selectivity of AMP/SBA-15 composite for 137 Cs+ remained well as the concentration of K+ was 7 orders of magnitude more than that of 137 Cs+. The effect of γ irradiation was not obvious when the initial 137Cs+ concentration was under 2×104Bq/L. The prepared AMP/SBA-15 composite may be a potential adsorbent which can be used in the disposal of low radioactive waste water.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2016年第5期743-747,共5页
Chemical Research and Application
基金
中国工程物理研究院科技发展基金(2015B0301046)资助
