活性白土对油脂溶液中β-胡萝卜素的吸附热力学及动力学研究  

STUDY ON ADSORPTION THERMODYNAMICS AND KINETICS OF β-CAROTENE IN OIL SOLUTION ON ACID-ACTIVATED BENTONITE

作　　者：武占省[1,2] 王雅言[2] 孙喜房[2] 李春[1,2] 

机构地区：[1]北京理工大学生命学院,北京100081 [2]新疆兵团化工绿色过程重点实验室,石河子大学化学化工学院,石河子832003

出　　处：《离子交换与吸附》2009年第6期488-495,共8页Ion Exchange and Adsorption

基　　金：国家自然科学基金项目(20904033);教育部"春晖计划"国际合作项目(Z2006-1-83018);新疆兵团重点科技攻关计划工业项目(2008GG24);新疆特殊环境微生物重点实验室开放基金(XJYS0203-2009-01)

摘　　要：探讨了活性白土(AAB)对油脂溶液中β-胡萝卜素的吸附热力学及动力学特征,AAB对β-胡萝卜素的吸附行为可用Langmuir和Freundlich等温式进行描述,相关性均较好,在高温条件下(75～95℃),AAB对β-胡萝卜素的吸附更符合Freundlich模型的吸附行为。分别采用拟一级反应和拟二级反应模型描述了吸附动力学数据,表明AAB吸附β-胡萝卜素适合于拟二级吸附动力学行为,且高温有利于提高吸附量和吸附速率。AAB对β-胡萝卜素的吸附表观活化能Ea为38.673kJ/mol,表明整个吸附过程涉及到化学吸附作用;通过对吸附热力学参数△H、△S及△G的分析,表明吸附过程是自发进行且伴随着吸热及熵值的增加,吸附趋势随着温度的升高而有所增大。The adsorption behavior of t-carotene in oil solution on acid-activated bentonite （AAB） was investigated. Experimental data of t-carotene adsorption on AAB at different temperatures were agreed well with the Langmuir model and the Freundlich model, while the Freundlich model appeared to fit better experimental data at higher temperatures （75-95℃）. Experimental data were described by the pseudo first-order model and the pseudo second-order model, the pseudo second-order model was agreed well on adsorption oft-carotene. Increasing of temperature was favor to enhance the adsorption amount and rate of t-carotene on AAB. 38.673kJ/mol of activation energy of adsorption oft-carotene on AAB indicated that the whole adsorption process was involved in chemical interaction. Various thermodynamic parameters, AH, AS and AG were analysed, the results showed that the adsorption process was spontaneous and endothermic, and accompanied with the entropy increases, the adsorption trend was increased with increasing of temperature.

关 键 词：Β-胡萝卜素 活性白土 吸附热力学 动力学 

分 类 号：TD985[矿业工程—选矿]