Highly efficient full solar spectrum (UV-vis-NIR) photocatalytic performance of Ag2S quantum dot/TiO2 nanobelt heterostructures

Photo-Fenton Degradation of AO7 and Photocatalytic Reduction of Cr(VI) over CQD-Decorated BiFeO3 Nanoparticles Under Visible and NIR Light Irradiation

“…Generally, it is known that the visible light and near-infrared (NIR) light occupy~45% and~46% of solar energy, respectively, and their application has received a great deal of interest [15,16]. As a result, the development of broad spectrum (UV-vis-NIR) active catalysts with efficient separation of photogenerated charges is very important for their practical applications [17][18][19][20]. Up to now, the iron-contained catalysts with narrow bandgap are considered as ideal candidates in the photocatalytic and photo-Fenton-like catalytic applications [21][22][23][24][25].…”

Synthesis of superparamagnetic biocidal superior solar photocatalytic Fe3O4-implanted Ag2S-capped ZnO micro-clubbells

“…Medicinal use of ZnO ointment is in practice for decades and Zn 2+ is a micronutrient for crops. Both TiO 2 and ZnO require UV A light for photocatalysis and the UV component in the natural sunlight that reaches earth's surface is only about 5%; visible light (45%) and near-infrared radiation (50%) are the major components of natural sunlight [7]. Hence photocatalysts which utilize natural sunlight for mineralization of pollutants are of interest, especially in tropical regions.…”

“…Hence photocatalysts which utilize natural sunlight for mineralization of pollutants are of interest, especially in tropical regions. Ag 2 S is a highly stable (solubility product 6.3 × 10 −50 [8]-8 × 10 −51 [9]) n-type narrow band gap (0.9-1.05 eV) [7,[10][11][12] semiconductor with a large absorption coefficient [7,11]. It is black in color and displays negligible toxicity [7,13].…”

“…Ag 2 S-deposited (1) TiO 2 [7,[12][13][14][15][16][17][18][19][20] or (2) ZnO [21][22][23][24] absorbs near infrared, visible and ultraviolet light, the whole solar spectrum, and mineralizes organic pollutants. Ag 2 S acts as a photosensitiser, enables visible light absorption and enhances charge carrier separation between Ag 2 S and TiO 2 [7,[13][14][15][16][17][18]20] or ZnO [23,24]. Further, Ag 2 S itself is a visible light-near infrared-photocatalyst [10].…”

“…The DRS shows strong visible light absorption by the synthesized sample. This is because of Ag 2 S capping of the micro-clubbells; the widely reported band gap of pristine Ag 2 S is 0.9-1.05 eV[7,[10][11][12]. The displayed DRS, in addition to visible light absorption, exhibits a sharp UV absorption edge at 389 nm.…”