Journal
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
Volume 75, Issue -, Pages 93-99Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2019.03.002
Keywords
Cyclodextrin polymer; Sorption-desorption cycles; Breakthrough curve; Elution curve; Kinetic modeling; Mass-transfer coefficient
Funding
- University of Navarra (PIUNA Research Plan)
- Friends of the University of Navarra Inc.
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This paper examines the long-term application of a cyclodextrin hydrogel sorbent in multiple sorption-desorption cycles. Aqueous phenol was the target pollutant, whilst methanol, ethanol and isopropanol were chosen as eluents. The experimental results were well described by empirical models: the breakthrough curves by a two-parameter dose-response equation, and the elution curves by a pulse peak equation with two independent parameters. The differences in polarity of solvents produced sorbent fragmentation, particularly marked for isopropanol and considerably lower for methanol, and therefore a progressive increase in mass-transfer coefficients. In addition, a dual approach was developed from the proposed breakthrough model to address the mass transport of sorbate within the packed beds. The first one defines an average mass-transfer coefficient as representative for each complete sorption cycle, whereas a time-profile of this coefficient is deduced in the second method. A sorption capacity of 29.6 mg-phenol/g-sorbent was found in the working conditions. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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