Abstract

Degussa P25 titanium dioxide/chitosan composites (P25/CS) were prepared using three different methods and two different chitosan materials. The obtained materials were characterized by diffuse reflectance UV–Vis, Fourier-transform infrared spectroscopies, X-ray diffraction, and scanning electron microscopy. It was observed for all prepared materials that the chitosan surface is homogeneously covered by Degussa P25, the particles are evenly dispersed on the whole chitosan matrix and do not form agglomerates. The performance of P25/CS composites were tested in water treatment by the photocatalytic reaction of sertraline and Acid Red 18. The obtained results show that the application of prepared composites is effective in the reaction of decomposition of model organic impurities in water. Moreover, chitosan presence in the photocatalytic materials considerably facilitates the separation of catalyst from the reaction mixture, which is a great advantage compared to pure Degussa P25. The preparation method did not show a major effect on the photocatalytic activity. The method using glutaraldehyde as the crosslinking agent is the simplest one; thus, it is recommended for Degussa P25/chitosan nanocomposites preparation. These nanocomposites can be successfully applied in water purification by photocatalytic degradation of organic pollutants.

Graphic Abstract

中文翻译：

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Degussa P25 /壳聚糖复合材料的合成，表征及光催化去除水中舍曲林和酸性红18的评价

摘要

使用三种不同的方法和两种不同的壳聚糖材料制备了Degussa P25二氧化钛/壳聚糖复合材料（P25 / CS）。所获得的材料通过紫外-可见漫反射，傅立叶变换红外光谱，X射线衍射和扫描电子显微镜进行表征。对于所有制备的材料，观察到壳聚糖表面被Degussa P25均匀地覆盖，颗粒均匀地分散在整个壳聚糖基质上，并且不形成附聚物。通过舍曲林和酸性红18的光催化反应测试了P25 / CS复合材料在水处理中的性能。获得的结果表明，所制备的复合材料的应用在水中模型有机杂质的分解反应中是有效的。而且，光催化材料中壳聚糖的存在大大促进了催化剂从反应混合物中的分离，与纯Degussa P25相比，这是一个很大的优势。制备方法对光催化活性没有显着影响。最简单的方法是使用戊二醛作为交联剂。因此，建议用于Degussa P25 /壳聚糖纳米复合材料的制备。这些纳米复合材料可通过光催化降解有机污染物而成功应用于水净化。建议用于Degussa P25 /壳聚糖纳米复合材料的制备。这些纳米复合材料可通过光催化降解有机污染物而成功应用于水净化。建议用于Degussa P25 /壳聚糖纳米复合材料的制备。这些纳米复合材料可通过光催化降解有机污染物而成功应用于水净化。

图形摘要