Preparation and characterization of a chitosan/TiO2 nanocomposite hydrogel intended for the photocatalytic degradation of pollutants

IF 2.8 4区工程技术 Q2 POLYMER SCIENCE Macromolecular Research Pub Date : 2024-03-20 DOI:10.1007/s13233-024-00254-w

Hafida Sehil, Mohamed Badaoui, Abdelkader Chougui, Larbi Bouhadjar, Wissame Aoun, Lamia Belkhier

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Abstract

Nanocomposite chitosan-based hydrogels (chitosan-co-polycrotonic acid), with and without TiO₂, were prepared via chemical cross-linking of chitosan using sodium trimetaphosphate (STMP), followed by free radical polymerization. The structural and morphological properties of the synthesized composites were investigated and analyzed using X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and diffuse reflectance spectroscopy (DRS) techniques, as well as by determining the swelling rate and the pH at the point of zero charge (pH_pzc). The results of these analyses showed that the cross-linking of chitosan by STMP and the distribution of TiO₂ nanoparticles on the surface of the gel were both successfully achieved. In addition, the incorporation of TiO₂ particles into the hydrogel led to an increase in the swelling rate but a reduction in the band gap of titanium dioxide. These findings allowed concluding that the prepared material can be used for the efficient photocatalytic degradation of pollutants.

Graphical Abstract

The nanocomposite chitosan-based hydrogels prepared via chemical cross-linking of chitosan using sodium trimetaphosphate (STMP) with and without TiO₂ can be used for the efficient photocatalytic degradation of pollutants

Abstract Image

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用于光催化降解污染物的壳聚糖/二氧化钛纳米复合水凝胶的制备与表征

通过使用三偏磷酸钠（STMP）对壳聚糖进行化学交联，然后进行自由基聚合，制备了含有和不含 TiO2 的壳聚糖基纳米复合水凝胶（壳聚糖-聚巴豆酸）。利用 X 射线衍射、傅立叶变换红外光谱（FTIR）、扫描电子显微镜（SEM）、差示扫描量热仪（DSC）和漫反射光谱（DRS）技术，以及溶胀率和零电荷点的 pH 值（pHpzc）测定方法，对合成复合材料的结构和形态特性进行了研究和分析。这些分析结果表明，STMP 成功地交联了壳聚糖，并在凝胶表面分布了 TiO2 纳米粒子。此外，在水凝胶中加入 TiO2 粒子会导致溶胀率增加，但二氧化钛的带隙会减小。图解摘要通过使用三偏磷酸钠（STMP）对壳聚糖进行化学交联制备的纳米复合壳聚糖水凝胶可用于高效光催化降解污染物。

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来源期刊

Macromolecular Research 工程技术-高分子科学

CiteScore

4.70

自引率

8.30%

发文量

100

审稿时长

1.3 months

期刊介绍： Original research on all aspects of polymer science, engineering and technology, including nanotechnology Presents original research articles on all aspects of polymer science, engineering and technology Coverage extends to such topics as nanotechnology, biotechnology and information technology The English-language journal of the Polymer Society of Korea Macromolecular Research is a scientific journal published monthly by the Polymer Society of Korea. Macromolecular Research publishes original researches on all aspects of polymer science, engineering, and technology as well as new emerging technologies using polymeric materials including nanotechnology, biotechnology, and information technology in forms of Articles, Communications, Notes, Reviews, and Feature articles.