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<strong>Study on the adsorption characteristics of aqueous caffeine solutions on macroporous resins with hydrogen-bonding interactions</strong>

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Title Statement <strong>Study on the adsorption characteristics of aqueous caffeine solutions on macroporous resins with hydrogen-bonding interactions</strong>
 
Added Entry - Uncontrolled Name Zhao, Qingsheng ; College of Chemical Engineering, Qingdao University of Science & Technology
Yin, Jinhua ; College of Chemical Engineering, Qingdao University of Science & Technology
Wang, Xu ; Zhangdian Borough of Quality and Technology Supervision
Du, Deqing ; Shandong Xinhua Pharmaceutical Co., Ltd
Ye, Qingguo ; College of Chemical Engineering, Qingdao University of Science & Technology
Nature Science Foundation of Shandong Province, China
 
Uncontrolled Index Term Macroporous resin; Caffeine; Adsorption isotherm; Adsorption kinetics; Hydrogen-bonding interaction
 
Summary, etc. The adsorption characteristics of caffeine on six macroporous resins have been investigated. The results show that the resin with hydroxyl groups (XDA-200) offer better adsorption/ desorption capacity than other resins, and its adsorption kinetics fit a pseudo- second-order model. The adsorption process is a type of fast adsorption, and multiple adsorption mechanisms controlled the rate of adsorption. The isothermal equilibrium curve of caffeine adsorbed onto XDA-200 show a good fit to the Freundlich model, and thermodynamics tests show that the process is exothermic and spontaneous. The absolute value of enthalpy is 14.347 kJ/mol, which is in the range of the adsorption enthalpy related to hydrogen-bonding interactions. XPS and FTIR analyses also verify the existence of hydrogen-bonding interactions.
 
Publication, Distribution, Etc. Indian Journal of Chemical Technology (IJCT)
2019-02-07 14:27:05
 
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http://op.niscair.res.in/index.php/IJCT/article/view/16188
 
Data Source Entry Indian Journal of Chemical Technology (IJCT); ##issue.vol## 25, ##issue.no## 6 (2018): Indian Jouranl of Chemical Technolgy
 
Language Note en