Highly efficient in‐situ sulfur doped graphitic carbon nitride nanoplates as an artificial photosynthetic system for NADH regeneration

Abstract

Photocatalysis reduces the challenges associated with power activities by the conversion of solar energy into chemical energy. Herein, sulfur‐doped graphitic carbon nitride nanoplate (S‐g‐CN‐NP) via polycondensation and vapor oxidative treatment methods as a promising solar light‐reactive photocatalyst has been designed. The photo‐mediated reduction of NAD+ is used to facilitate the extremely efficient solar light‐driven photocatalytic selective production of nicotinamide adenine dinucleotide (NADH). The S‐g‐CN‐NP photocatalyst shown excellent optical and photoelectrical properties, supporting an NADH yield of (97±0.010 %), which was 1.5 folds higher than that of S‐g‐CN powder (65±0.012 %). Through the transformation of S‐g‐CN powder to nanoplates, the improvement of photocatalytic in S‐g‐CN‐NP was primarily ascribed to the growth of active sites of the nanoplates. The current study focuses on the creation and use of an S‐g‐CN‐NP photocatalyst for direct selective NADH regeneration under solar light.

Effortless One-Pot Two-Step Creation of NiS-NiO/S-g-C3N4: The Next Generation Photocatalyst for Green C(sp3)-F Bond Activation and Coenzyme Regeneration

“…The broad peak at 538 nm was obtained for NiS-NiO/S-g-C3N4 photocatalyst. Whereas a peak at 455 nm was obtained for S-g-C3N4by previous study [28]. Using Scherrer equation the optical band gap of S-g-C3N4 and NiS-NiO/S-g-C3N4 photocatalysts were calculated to be 2.72eV and 2.30 eV, respectively.…”

“…The FTIR spectra of S-g-C3N4 and NiS-NiO/S-g-C3N4 photocatalysts are shown in (Figure 2), confirming the presence of NiS and NiO in the nanocomposite. The vibrational spectrums of S-g-C3N4 in which the stretching vibration of the C-N bond is assigned to the representative characteristic peaks at 2065, 1045, 920, 870, and 775 cm -1 [28,31]. The broad absorption peaks in the range 3600-2555 cm -1 shows its non-crystalline nature and associated to N-H stretching vibration modes.…”

“…The optical band gap in NiS-NiO/S-g-C3N4 photocatalyst system was investigated using diffuse reflectance spectroscopy (DRS). The optical property of NiS-NiO/S-g-C3N4 photocatalyst was studied by UV visible absorption spectra as shown in (Figure 1) and compared with S-g-C3N4 by literature [28]. The broad peak at 538 nm was obtained for NiS-NiO/S-g-C3N4 photocatalyst.…”

“…After filtration the compound obtained on filter paper was kept overnight at 70°C in oven for drying. The obtained soft powder was of S-g-C3N4 [28,29]. Scheme 2.…”