Keville P. Oliveira, Ernani D. da Silva Filho, Vivian Y. Brizola, Marcia R. Pereira, Alcides O. Wanderley Neto, José L. C. Fonseca
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引用次数: 0
Abstract
The presence of numerous drugs in effluents poses the multiple challenges of removing them from effluents, quantifying them, and developing models to describe the adsorption process. In this manuscript, we present our work on the competitive sorption of sodium cromoglicate (CG) and sodium diclofenac (DF) on crosslinked chitosan particles (C-CHIT). In the Supplementary Material of this manuscript, we provide a method for simultaneously determining the concentrations of these drugs in effluents using trivial UV–Vis spectrophotometric measurements. This method was used to build sorption isotherms for the competitive sorption of these two drugs. Competitive sorption is evident in the sorption isotherms in the form of two regimes: in the first stage, the surface is saturated with CG, and after a sharp discontinuity, adsorption is governed by DF. These ternary solution two-step isotherms can be mathematically described as composed of isotherms derived from the sorption of binary solutions on C-CHIT, with the discontinuity related to their Gibbs free energies of adsorption and lateral interaction parameters. To our knowledge, there are no descriptions of competitive sorption of this kind reported in the literature.
期刊介绍：
Colloid and Polymer Science - a leading international journal of longstanding tradition - is devoted to colloid and polymer science and its interdisciplinary interactions. As such, it responds to a demand which has lost none of its actuality as revealed in the trends of contemporary materials science.
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