Porcu Stefania, Secci Francesco, Abdullah Qader Abdulqader, Ricci Pier Carlo
Department of Physics, University of Cagliari, 09042 Monserrato, Italy.
Department of Chemical and Geological Science, University of Cagliari, 09042 Monserrato, Italy.
Polymers (Basel). 2021 Oct 29;13(21):3752. doi: 10.3390/polym13213752.
The photoreduction of 4-nitrophenol to 4-aminophenol by means of protonated and exfoliated phenyl-doped carbon nitride is reported. Although carbon nitride-based materials have been recognized as efficient photocatalysts, the photoreduction of 4-nitrophenol to 4-aminophenol is not allowed because of the high recombination rate of the photogenerated electron-hole pairs. In this paper, we show the morphology effects on the photoactivity in phenyl-doped carbon nitride. Structural (TEM, XRD, Raman) and optical characterization (absorption, photoluminescence) of the protonated and exfoliated phenyl-doped carbon nitride (hereafter pePhCN) is reported. The increased photocatalytic efficiency, with respect to the bulk material, is underlined by the calculation of the kinetic constant of the photoreduction process (2.78 × 10 min and 3.54 × 10 min) for pePhCN and bulk PhCN, respectively. Finally, the detailed mechanism of the photoreduction process of 4-nitrophenol to 4-aminophenol by modified phenyl carbon nitride is proposed.
报道了通过质子化和剥离的苯基掺杂氮化碳将4-硝基苯酚光还原为4-氨基苯酚的过程。尽管氮化碳基材料已被认为是高效的光催化剂，但由于光生电子-空穴对的高复合率，4-硝基苯酚不能被光还原为4-氨基苯酚。在本文中，我们展示了苯基掺杂氮化碳的形貌对光活性的影响。报道了质子化和剥离的苯基掺杂氮化碳（以下简称pePhCN）的结构（TEM、XRD、拉曼）和光学表征（吸收、光致发光）。通过分别计算pePhCN和本体PhCN光还原过程的动力学常数（2.78×10⁻³ min⁻¹和3.54×10⁻³ min⁻¹），突出了相对于本体材料，pePhCN光催化效率的提高。最后，提出了改性苯基氮化碳将4-硝基苯酚光还原为4-氨基苯酚的详细过程机理。
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