The reuse of waste and the use of renewable materials are of great environmental and economic interest. With that in mind, the synthesis of mesoporous silica can be performed using rice husk ash, which is an industrial waste generated in large quantities. This mesoporous material can be functionalized with photoactive molecules, enabling application in photocatalysis. In this work, we used mesoporous silica nanoparticles functionalized with rose bengal dye (RB) for photooxidation reactions of organic molecules, such as the antibiotic cefuroxime 1‐acetoxyethyl ester (cefuroxime axetil). The characterization results showed the formation of one‐dimensional channels with uniform size and two‐dimensional hexagonal arrangement, with surface area and pore diameter of 230 m2 g−1 and 5 nm, respectively. The infrared and UV‐Vis spectroscopy indicated the functionalization of silica with photoactive molecules. Finally, SBA‐15/RB was applied for the photooxidation of ascorbic acid and antibiotic cefuroxime axetil under irradiation with green light, proving to be efficient for the degradation of cefuroxime axetil. Investigation of the reactive oxygen species involved in photodegradation showed that the photooxidation mechanism mainly involves singlet oxygen.

中文翻译：

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孟加拉玫瑰功能化介孔二氧化硅对有机化合物的光氧化

废物的再利用和可再生材料的使用具有巨大的环境和经济利益。考虑到这一点，可以使用大量产生的工业废物稻壳灰来合成介孔二氧化硅。这种介孔材料可以用光活性分子进行功能化，从而能够应用于光催化。在这项工作中，我们使用用孟加拉玫瑰染料（RB）功能化的介孔二氧化硅纳米颗粒进行有机分子的光氧化反应，例如抗生素头孢呋辛1-乙酰氧基乙酯（头孢呋辛酯）。表征结果表明，形成了尺寸均匀、二维六边形排列的一维通道，表面积和孔径为230 m2G−1和 5 nm 分别。红外和紫外-可见光谱表明二氧化硅被光敏分子官能化。最后，将SBA-15/RB应用于绿光照射下的抗坏血酸和抗生素头孢呋辛酯的光氧化，证明能够有效降解头孢呋辛酯。对参与光降解的活性氧的研究表明，光氧化机制主要涉及单线态氧。