(北京理工大學(xué) 爆炸科學(xué)與技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100081)
摘 要: 采用自制強(qiáng)酸性陽(yáng)離子交換纖維對(duì)水溶液中In3+的吸附特性進(jìn)行研究，在溫度為293~323 K和研究的濃度范圍內(nèi)，強(qiáng)酸性陽(yáng)離子交換纖維對(duì)In3+吸附平衡數(shù)據(jù)采用Langmuir、Dubini-Radushkevieh(D-R)、Freundlich、Temkin、Redlich-Peterson(R-P)和Koble-Corrigan(K-C)等6種等溫吸附模型，對(duì)在不同溫度下SACEF吸附In3+的等溫實(shí)驗(yàn)數(shù)據(jù)進(jìn)行線性和非線性擬合。結(jié)果表明：除Langmuir非線性擬合及Dubini-Radushkevieh模型之外，其余模型的線性及非線性擬合結(jié)果均較好，可以用于描述強(qiáng)酸性陽(yáng)離子交換纖維吸附水中In3+的等溫吸附行為，相關(guān)系數(shù)R2值都在0.9左右。綜合考慮相關(guān)系數(shù)來(lái)看，Langmuir模型(線性擬合)最為適合。等量吸附焓表明：強(qiáng)酸性陽(yáng)離子交換纖維對(duì)In3+吸附是吸熱過(guò)程，水合In3+離子在強(qiáng)酸性陽(yáng)離子交換纖維上的吸附焓大于0，是一個(gè)吸熱、自發(fā)和熵增的過(guò)程，并對(duì)吸附行為進(jìn)行了合理解釋。
關(guān)鍵字: 強(qiáng)酸性陽(yáng)離子交換纖維；In3+；等溫吸附模型；吸附熱力學(xué)
（State Key Laboratory of Explosion and Technology, Beijing Institute of Technology, Beijing 100081, China）
Abstract:Adsorption of In3+ from aqueous solution by strong acid cationic exchange fiber (SACEF) was studied using batch experiments. Langmuir, Dubinin-Radushkevich (D-R), Freundlich, Temkin, Redlich-Peterson(R-P)and Koble-Corrigan (K-C) models were applied to analyze the adsorption equilibrium data of In3+ on SACEF obtained with researching range of concentration at 293−323 K through linear fitting and nonlinear fitting methods. The results show that, except for Langmuir nonlinear fitting and Dubini-Radushkevieh models, the adsorption equilibrium data can be well interpreted by both the linear fitting and nonlinear fitting of the models with the R2 values about 0.9. Out of all the models, Langmuir linear fitting model is the suitable model with highest linear fitting R2 value. The value of isosteric enthalpy indicates that the endothermic nature of the adsorption of In3+ on SACEF. The adsorption of In3+ on SACEF is an endothermic, spontaneous and entropy increase process with ∆H＞0 and reasonable explanation is given to the adsorption behavior.
Key words: strong acidic cationic-exchange fiber (SACEF); In3+; isothermal adsorption model; adsorption thermodynamic
