Postgraduate in Civil and Environmental Engineering, Faculty of Engineering and Architecture, University of Passo Fundo, BR 285, km 171, Passo Fundo, RS, Brazil.
Chemical Engineering Course, Faculty of Engineering and Architecture, University of Passo Fundo, BR 285, km 171, Passo Fundo, RS, Brazil.
Carbohydr Polym. 2022 Feb 1;277:118868. doi: 10.1016/j.carbpol.2021.118868. Epub 2021 Nov 8.
Composite materials are effective adsorbents for the removal of various types of contaminants, such as pharmaceutical products. However, they require improvement to achieve a good adsorption capacity. This study presents the development of a promising adsorbent: silica/chitosan modified with different proportions of glutaraldehyde, which involves the D-glucosamine units from chitosan. The developed materials were evaluated for their ability to remove diclofenac sodium. The adsorption data showed that the diclofenac adsorption efficiency increased with increasing degree of glutaraldehyde crosslinking. The equilibrium and kinetic data were well fit by the Liu and Elovich models, respectively, and the maximum adsorption capacity was 237.8 mg/g. Therefore, it can be assumed that the process is predominantly chemical and exothermic, with a high affinity between the adsorbents and diclofenac sodium. The adsorption mechanisms were investigated to better understand the interactions, and the predominance of covalent bonds with the self-polymerized glutaraldehyde was verified.
复合材料是去除各种类型污染物（如药物产品）的有效吸附剂。然而，它们需要改进以达到良好的吸附能力。本研究提出了一种有前途的吸附剂的开发：用不同比例的戊二醛改性的硅胶/壳聚糖，其中涉及壳聚糖的 D-葡萄糖胺单元。所开发的材料被评估了去除双氯芬酸钠的能力。吸附数据表明，双氯芬酸钠的吸附效率随戊二醛交联程度的增加而增加。平衡和动力学数据分别很好地符合刘和埃洛维奇模型，最大吸附容量为 237.8 mg/g。因此，可以假设该过程主要是化学和放热的，吸附剂和双氯芬酸钠之间具有高亲和力。研究了吸附机制以更好地理解相互作用，并验证了与自聚合戊二醛的共价键的优势。
