Thiourea assisted hydrothermal synthesis of ZnS/CdS/Ag₂S nanocatalysts for photocatalytic degradation of Congo red under direct sunlight illumination

Abstract

Solar light active ternary ZnS/CdS/Ag 2 S nanocatalysts have been synthesized via hydrothermal process. The crystal structure, optical, morphological and surface area of the catalyst are characterized by XRD, UV DRS, PL, FE-SEM and BET measurements. The ternary catalyst has a decreased band gap energy value than that of the ZnS semiconductor. The catalyst was scrutinized for its catalytic performance under direct sunlight towards the degradation of textile dye -congo red at different time intervals. The results confirm that the Ag 2 S incorporated ternary ZnS/CdS/Ag 2 S nanocatalyst has good photocatalytic performance under direct sunlight when compared to binary and mono semiconductor systems.

Effect of Cation Exchange Time on the Morphology and Photoactivity of CdS/Ag2S Composites for Ciprofloxacin Degradation

“…After contact of CdS with Ag 2 S, to achieve Fermi equilibrium, the band edge bending of CdS moves downward, whereas that of Ag 2 S rises upward. [41,42] Therefore, under illumination, the excited electrons on the CB of Ag 2 S flow toward the CB of CdS, while photogenerated holes transfer from the CdS to Ag 2 S, facilitating the effective photogenerated charge separation. To further investigate the possible photocatalytic degradation pathways of CIP, the intermediates in the CIP degradation were identified using high-performance liquid chromatographymass spectrometry (HPLC/MS).…”

Continuous Flow Reactor for the Controlled Synthesis and Inline Photocatalysis of Antibacterial Ag2S Nanoparticles

“…This clearly suggests that microreactor could be a better substrate for the photocatalytic reaction to achieve higher efficiency. This is mainly because of faster mass and heat transfer, thus shortening the mean-free path in the reactants in micron size channels as well as more uniform irradiation of light as compared to the conventional bulk reactor (40,43,45).…”

“…Solving the environmental problems with the advancement of science and technology is a global challenge. Water pollutants generated by textile, dye, paint and paper industries have become one of the most important environmental concerns, as the demands of clean water by society are increasing day-by-day (40)(41)(42). Reuse of wastewater could be helpful; however, the dissolved toxic chemicals in the wastewater have to be treated completely before its supply to the society.…”

In situ growth of Ag2S quantum dots on SnS2 nanosheets with enhanced charge separation efficiency and CO2 reduction performance

“…12–14 Among various materials, Ag 2 S nanoparticles with a reasonable bandgap (∼1.1 eV) represent a preeminent candidate with ultralow solubility ( K sp (Ag 2 S) = 6.3 × 10 −50 ), low toxicity, and broad light-absorption from the ultraviolet (UV) to near-infrared (NIR) region. 30 Many Ag 2 S-based photocatalysts, such as ZnS/CdS/Ag 2 S, 31 Ag 2 S/Ag 3 PO 4 , 27 rGO/Ag 2 S/TiO 2 , 32 and Ag 2 S/ZnS/carbon nanofiber, 33 have been used for the photocatalytic degradation of organic pollutants. Furthermore, the use of Ag 2 S quantum dots (QDs) as a co-catalyst to assist photo-induced electron transfer is beneficial for enhancing the H 2 -evolving activity.…”