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Research articles

ScienceAsia (): 346-354 |doi: 10.2306/scienceasia1513-1874...346

Kinetics, isotherm and thermodynamics of sterol adsorption on styrene-divinylbenzene anion-exchange resins

Chinakrit Ladadoka, Takehiro Yamakib, Keigo Matsudac, Hideyuki Matsumotod, Duangkamol Na-Ranonga,*

ABSTRACT:     Phytosterols can be recovered from natural resources using molecular distillation, cold crystallization, which require large energy consumption. Adsorption was considered as a feasible alternative method. In this study, kinetics, isotherm and thermodynamics of stigmasterol adsorption on styrene-divinylbenzene with two different functional groups, strong base (SB-R) and weak base (WB-R), were investigated using a model solution of stigmasterol in n-heptane. Isothermal adsorption experiments were performed in temperature range of 298?313 K and concentration range of 0.3?6.0 mg/gsol. For both SB-R and WB-R cases, kinetics of adsorption was analysed based on pseudofirst-order and pseudo-second-order models and the results revealed that pseudo-second-order model agreed with the experimental data much better than pseudo-first-order model. Analysis of isotherm data based on Langmuir, Freundlich and linear models showed that Freundlich was the best model that could predict behaviour of sterol adsorption for both SB-R and WB-R cases. In addition, thermodynamics parameters (ΔG, ΔH and ΔS) indicated that the sterol adsorptions on these adsorbents were spontaneous, exothermic and favourable at low temperature.

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a Department of Chemical Engineering, Faculty of Engineering, King Mongkut?s Institute of Technology Ladkrabang, 1, Chalongkrung 1, Ladkrabang, Bangkok 10520 Thailand
b National Institute of Advanced Industrial Science and Technology, Research Institute for Chemical Process Technology, 1-1-1 Higashi, Tsukuba, Ibaraki Japan
c Department of Chemistry and Chemical Engineering, Graduate School of Science and Engineering, Yamagata University, 4-3-16, Jonan, Yonezawa-shi, Yamagata 992-8510 Japan
d Department of Chemical Science and Engineering, School of materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552 Japan

* Corresponding author, E-mail: dnaranong@hotmail.com, duangkamol.na@kmitl.ac.th

Received 9 Jan 2018, Accepted 19 Nov 2018