Competitive sorption of two anionic drugs on chitosan

IF 2.2 4区化学 Q3 CHEMISTRY, PHYSICAL

Colloid and Polymer Science Pub Date : 2024-08-23 DOI:10.1007/s00396-024-05308-0

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.

Graphical abstract

Abstract Image

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两种阴离子药物在壳聚糖上的竞争性吸附

污水中存在多种药物，这给从污水中去除这些药物、量化这些药物以及开发描述吸附过程的模型带来了多重挑战。在本手稿中，我们介绍了色甘酸钠（CG）和双氯芬酸钠（DF）在交联壳聚糖颗粒（C-CHIT）上的竞争性吸附。在本手稿的补充材料中，我们提供了一种利用微不足道的紫外可见分光光度法同时测定污水中这些药物浓度的方法。我们利用这种方法建立了这两种药物竞争吸附的吸附等温线。竞争性吸附在吸附等温线中表现为两种状态：在第一阶段，表面被 CG 饱和，在一个急剧的不连续性之后，吸附由 DF 主导。这些三元溶液两步等温线在数学上可以描述为由二元溶液在 C-CHIT 上的吸附等温线组成，其不连续性与二元溶液的吸附吉布斯自由能和横向相互作用参数有关。据我们所知，文献中还没有关于这种竞争性吸附的描述。

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来源期刊

Colloid and Polymer Science 化学-高分子科学

CiteScore

4.60

自引率

4.20%

发文量

111

审稿时长

2.2 months

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.