Benazzi Valentina, Bini Arianna, Bertuol Ilaria, Novello Mariangela, Baldi Federica, Hoch Matteo, Perosa Alvise, Protti Stefano
Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
Department of Molecular Sciences and Nanosystems, Università Ca' Foscari Venezia, Via Torino 155, 30172 Venezia Mestre, Italy.
Beilstein J Org Chem. 2025 May 26;21:1024-1030. doi: 10.3762/bjoc.21.84. eCollection 2025.
We investigated the potential application of six types of carbon dots (CDs) obtained from different organic sources as photoreductants. Such carbon nanomaterials were synthesized by two different approaches, either hydrothermal or pyrolytic, from citric acid and glucose as the starting organic substrates. On the other hand, carbon dots deriving from fishery waste (bass scales) and fruit processing waste (blackberries) have been also prepared. Diethylenetriamine was employed in some cases as the nitrogen source. The hydrothermal syntheses yielded amorphous CDs, which were either non-doped (a-CDs) or nitrogen-doped (a-N-CDs), whereas the pyrolytic treatment afforded graphitic CDs (g-CDs). The efficiency of the so obtained carbon nanomaterials was studied in the model photoreduction reaction of triarylsulfonium salts to diaryl sulfides. A comparison carried out on the results obtained points out the key role of the starting substrates in determining the photophysics and the photochemical efficiency of the resulting CDs. In this context, citric acid-derived materials (both graphitic and amorphous) were found as the most promising materials, while less satisfactory results have been observed when using CDs derived from glucose and biowastes.
我们研究了从不同有机源获得的六种类型的碳点（CDs）作为光还原剂的潜在应用。这些碳纳米材料通过两种不同的方法合成，即水热法或热解法，以柠檬酸和葡萄糖作为起始有机底物。另一方面，还制备了源自渔业废料（鲈鱼鳞片）和水果加工废料（黑莓）的碳点。在某些情况下，使用二乙烯三胺作为氮源。水热合成产生无定形的碳点，其要么是未掺杂的（a-CDs），要么是氮掺杂的（a-N-CDs），而热解处理得到石墨化的碳点（g-CDs）。在三芳基锍盐光还原为二芳基硫醚的模型反应中研究了如此获得的碳纳米材料的效率。对所得结果进行的比较指出了起始底物在决定所得碳点的光物理和光化学效率方面的关键作用。在这种情况下，发现源自柠檬酸的材料（石墨化和无定形的）是最有前途的材料，而使用源自葡萄糖和生物废料的碳点时观察到的结果不太令人满意。
