斜发沸石处理模拟含铯放射性废水研究

Treatment of Simulated Radioactive Waste Water Containing Cs^+ with Clinoptilotite

用CsNO3配制成模拟含铯放射性废水,以新疆某地产斜发沸石为吸附剂,进行了Cs+的吸附和解吸试验,并探讨了等温吸附模式及解吸动力学行为。结果表明:斜发沸石对Cs+的吸附在16 h时达到平衡,其饱和吸附量为196.99 mg/g,等温吸附模式为Langmuir模式;10 g/L斜发沸石用量下,要保证Cs+的去除率达到97%以上,水中Cs+浓度不宜超过664.55 mg/L;斜发沸石上Cs+的解吸动力学行为适合用指数模型描述,理论上,要使饱和吸附的Cs+完全解吸,耗时将长达约99 d,显示出斜发沸石很强的固铯能力。

Taking clinoptilotite in Xinjiang as adsorbent,carried out the adsorption and desorption tests to the simulated radioactive waste water containing Cs＋ prepared by CsNO3,then discussed the isothermal absorption model and desorption dynamic behavior.The results show：clinoptilolite on removal rate of clinoptilolite to Cs＋ reaches equilibrium after 16 h,the saturated dosage adsorption is at 196.99 mg/g,the isothermal absorption model is Langmuir moel;under the dosage of Clinoptilotite at 10 g/L,in order to insure the removal rate of Cs＋ above 97%,the concentration of Cs＋ in water must be less than 664.55 mg/L;the desorption dynamic behavior of clinoptilotite to Cs＋ is suit to the description of index model,and it will take 99 d to fully desorb the saturated adsorption Cs＋ in theoretically which proves the solid ability of clinoptilotite to Cs＋.