摘要： 在 35 ℃恒温水化反应 90 d 条件下， 制备了 Na₂O-CaO-Al₂O₃- SiO₂-H₂O 系水化物凝胶， 探讨了水化物凝胶的化学组成对 Cs+ 吸附性 能的影响；讨论了水化物凝胶对 Cs⁺的吸附热力学行为。结果表明，当化 学组成为 n（CaO⁺Na₂O）/n（SiO₂⁺Al₂O₃）=0.66，n（Al₂O₃）/n（SiO₂）=0.3 时， 凝胶对 Cs⁺的 3 d 吸附量可达 10.693 6 mg/g；温度越低，吸附量越大，凝胶 对 Cs⁺的吸附近似服从 Freudlich、Langmuir 和 D-R 吸附等温式，反应为放 热反应，且以离子交换吸附为主； 吉布斯自由能和吸附熵为均为负值，反 应能自发进行。 吸附动力学符合 Lagergren 假二级速率方程模型。 

关键词：水化物凝胶；吸附热力学；吸附动力学

Abstract：The adsorption mechanism of Cs+ in hydration products gel from Na₂O-CaO-Al₂O₃-SiO₂-H₂O system was studied. The hydration products gel were synthesized at 35 ℃ for 90 d. The influence of material compositions on adsorption capacity of Cs⁺ was discussed. The adsorption thermodynam ics of Cs⁺ in hydration products gel were investigated. The results showed that the adsorption capacity of Cs⁺ was 10.693 6 mg/g in hydration prod ucts gel which chemical composition was n（CaO⁺Na₂O）/n（SiO₂⁺Al₂O₃）= 0.66， n（Al₂O₃）/n（SiO₂） = 0.3 after 3 d. The adsorption capacity of Cs⁺ in hydration products gel increased with the decrease of temperature. The ad sorption isothermal curve of Cs⁺ in hydration products gel was approxi mately in conformity to Freudlich，Longmuir and D-R formula，adsorption processes appeared to be exothermic and controlled by the ion exchange. The negative Gibbs values implied that adsorption reaction was a sponta neous process. The entropy change was found to be negative. The adsorption kinetics of Cs⁺ in hydration products gel was found to follow Lager gren pseudo second-order dynamic equation. 

Keywords：hydration products gel；adsorption thermodynamics；adsorp tion kineti