Enhanced photocatalytic activity of SnS2 quantum dot modified Sn3O4 nanosheet composite photocatalysts for wastewater treatment applications

Colloids and Surfaces A Physicochemical and Engineering Aspects, Journal Year: 2024, Volume and Issue: unknown, P. 135604 - 135604

Published: Oct. 1, 2024

Language: Английский

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CdS/ZnSnO₃ Hollow Core–Shell Nanocubes for Photocatalytic Hydrogen Evolution and Degradation of Ciprofloxacin

ACS Applied Nano Materials, Journal Year: 2023, Volume and Issue: 7(1), P. 649 - 660

Published: Dec. 19, 2023

The Sn2+ ion self-doping CdS/ZnSnO3 hollow core–shell cubic heterojunction photocatalyst is fabricated via an approach of hybrid coprecipitation-annealing-reduction-chemical method. As reported, the as-prepared CdS/Sn2+–ZnSnO3 exhibits prominent enhanced photocatalytic hydrogen evolution reaction (HER, ∼5218.71 μmol·g–1·h–1, Na2S + Na2SO3 sacrificial agent) and degradation than that ZnSnO3 (∼120/8.3-folds) CdS (∼50/5.2-folds). There, CdS/Sn2+-ZSO with a greater potential gradient can promote carrier separation; higher absorption increase visible-light response; Sn2+/Ov shallow donor level regulate structure, intrinsic injection, transportation. All these optimize efficiency effectively, including increasing transportation, prolonging lifetime, decreasing recombination. In addition, nanoshell provide vast active sites structure large internal cavities enhance solar efficiency, while retaining good stability during photocatalysis.

Language: Английский

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Highly efficient Z scheme heterojunction of colloidal SnO2 quantum dots grafted g-C3N4 for the degradation of rhodamine B under visible light

Results in Physics, Journal Year: 2024, Volume and Issue: 62, P. 107826 - 107826

Published: June 15, 2024

The strategic design of the heterojunction photocatalyst with an enhancement in charge transfer rate photogenerated carriers plays a key role wastewater treatment to remove organic pollutants. In current study, g-C3N4/SnO2 quantum dots (g-CN/c-SQDs) different ratios SQDs was prepared via sonochemical route. Z scheme for g-CN/c-SQDs visible light exhibits exceptional degradation performance RhB dye (98.25 % 40 min) cyclic stability. photocatalytic efficiency is ascribed efficient and redox reactions due between high surface areas g-C3N4 c-SQD, which evident from results photoluminescence spectra scavenger experiments. free radical capture experiments reveal electron pathway generation reactive oxygen species (ROS) generation, including superoxide (•O2–) hydroxyl (•OH) radicals has been involved process. This study provides insight construction Z- appropriate amount semiconductor photodegradation treatment.

Language: Английский

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Enhanced Visible-Light Photocatalysis Activity of TiO2/Ag Nanocomposites Prepared by the Ultrasound-Assisted Sol–Gel Method: Characterization and Degradation–Mineralization of Cationic and Anionic Dyes

Catalysts, Journal Year: 2024, Volume and Issue: 14(12), P. 883 - 883

Published: Dec. 3, 2024

Coupling TiO2 with various elements could enhance its photocatalytic activity. In this study, an innovative ultrasound-assisted sol–gel method was used to synthesize TiO2/Ag(x%) by varying Ag–support mass (x = 9.3, 17.1, and 23.6%), followed calcination at 450 °C for 30 min. The aim demonstrate that Ag compositing improves photoactivity under visible light (>400 nm). synthesized photocatalysts were assessed their effectiveness in the degradation mineralization of Methylene Blue (MB) Acid Orange 7 (AO7) using lamps emitting range 400–800 nm. Characterization prepared performed Raman spectroscopy, SEM/EDS, pHpzc, UV–visible spectroscopy. spectroscopy confirmed predominance anatase phase all photocatalysts. photodegradation efficiencies selected dyes, MB AO7, reached 99% (pH 6) 95% 3) after 180 min irradiation, respectively. best performance two dyes observed TiO2/Ag9.3%, showing optimal kinetics doping concentration. improved TiO2/Ag composite is due a decrease recombination rate electron/hole (e−/h+) band gap from 3.13 2.49 eV. both about 9.3%, indicating presence refractory by-products resist complete degradation. Under UVA obtained. This study confirms potential as high-performance cost-effective photocatalyst solar environmental remediation, highlighting role silver extending absorption into region improving charge separation.

Language: Английский

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Fabrication of MoS2QDs/Ag3PO4 photocatalyst for efficient visible light catalysis

Research on Chemical Intermediates, Journal Year: 2023, Volume and Issue: 49(11), P. 5029 - 5043

Published: Aug. 25, 2023

Language: Английский

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