摘要
本文以^134CS为示踪剂研究了蛭石对CS的吸附行为及各种实验条件对吸附的影响．结果表明：在初始浓度为C0=30μg／L的QN03溶液中，加入约20g／L蛭石，Cs的吸附率达98％，适宜吸附的pH为3～10，吸附在5h内达到平衡，温度在0～50℃范围内对吸附无明显影响，Q浓度与吸附量之间的关系符合Langmuir经验公式；Na^＋、C^2＋和较低浓度（1～200倍于地下水浓度）K^＋的存在使吸附率降低，较高浓度（400～2000倍于地下水浓度）的K^＋使吸附率显著升高，用（NH4）2SO4改性后的蛭石使吸附率有明显的提高．1mol／L的HNO3能将90％以上的Cs从蛭石上解吸下来．
The adsorption of Cs^＋ by vermiculite and the effect of experimental conditions were investigated. The results showed that the vermiculite is an efficient adsorbent for Cs^＋. More than 98% of the total Cs^＋ could be adsorbed by the vermiculite of 20 g/T, from Cs solution of 30μg/L, （C0） at pH = 5. The adsorption equilibrium was achieved within 5 hours and the optimum pH ranged from 3 to 10. No significant differences on Cs^＋ adsorption were observed at 0～50℃. The relationship between the concentration of Cs^＋ in aqueous solutions and adsorption capacities of Cs^＋ can be described by the Langmuir adsorption equation. The adsorption rate would decrease when presence of coexistent Na^＋ and Ca^2＋ and low concentration （0.8 mg/L～160 mg/L） of K^＋ , but it would increase when K^＋ in a higher concentration （320 mg/L～1600 rag/L）. Additionally, more than 98% Cs^＋ could be desorbed by 1 tool/L, HNO3 solution.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2008年第1期115-120,共6页
Journal of Sichuan University(Natural Science Edition)
关键词
Cs^+
蛭石
吸附
Cs^＋, vermiculite, adsorption
