化工学报2016，Vol.67Issue(11)：4671-4677,7.DOI:10.11949/j.issn.0438-1157.20160685
离子交换树脂对D-甘油酸的吸附热力学和动力学
Thermodynamics and kinetics of D-glyceric acid adsorption on ion exchange resin
摘要
Abstract
D-glyceric acid, one of the promising glycerol derivatives, has various biological functions such as accelerating ethanol and acetaldehyde oxidation. Plenty studies on the synthesis but few studies on downstream processes to recover D-glyceric acid were available. A static equilibrium adsorption was performed to study isothermal thermodynamics and kinetics of D-glyceric acid adsorption onto 201×7 strong basic anion exchange resin. The results showed that the adsorption process followed the Freundlich isothermal model at different pH and temperature conditions, which the maximum adsorption capacity decreased with increasing initial pH. The change of adsorption enthalpy was 14.77 kJ·mol−1 at 293—308 K, suggesting an endo-thermic adsorption process. Raising temperature improved adsorption rate with limited influence on equilibrium adsorption capacity. The Dynamic Boundary Model was used to investigate adsorption kinetics with a focus on effects of D-glyceric acid concentration, resin particle diameter and adsorption temperature. The results suggested the particle diffusion was rate-limiting step of the adsorption process. The adsorption rate increased with the increase of D-glyceric acid concentration and temperature, but decreased with the increase of resin particle diameter. The general kinetics equation was obtained with the rate constant of exchange (k0), reaction order (a) and the apparent activation energy of reaction (Ea) as followingk0=1.22×10−3,a=0.631,Ea=14.90 kJ·mol−1.关键词
D-甘油酸/离子交换/吸附/动力学/热力学Key words
D-glyceric acid/ion exchange/adsorption/kinetics/thermodynamics分类
化学化工引用本文复制引用
王宝贝,蒲洋,林丽芹,李清彪,卢英华..离子交换树脂对D-甘油酸的吸附热力学和动力学[J].化工学报,2016,67(11):4671-4677,7.基金项目
福建省高校产学合作项目（2015N5006）；福建省教育厅中青年教师教育科研项目（JA15393）；泉州师范学院青年博士预研基金项目（2015QBKJ04）。@@@@Foundation item：supported by the Industry-University Cooperation Project of Fujian Province (2015N5006), the Young PhD Pre-research Fund of Quanzhou Normal University (2015QBKJ04), and the Education Research Fund for Young and Middle-aged Teachers in Fujian Province (JA15393) （2015N5006）
