Kinetic modeling of sorption–desorption cycles for phenol removal with a cyclodextrin polymer

Publication date: 25 July 2019Source: Journal of Industrial and Engineering Chemistry, Volume 75Author(s): Francisco J. Peñas, Ana Romo, José R. Isasi, María J. San José, Sonia AlvarezAbstractThis 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.

Source: Journal of Industrial and Engineering Chemistry - April 13, 2019 Category: Chemistry Source Type: research