Abstract:Ultrafast visible light active CuS/ZnS nanostructured photocatalysts were synthesized by a hydrothermal method. The effect of the CuS concentration on the morphological, structural and optical properties of ZnS nanostructures were investigated. X-ray diffraction analysis indicated the formation of CuS/ZnS phases with good crystallinity. The presence of ZnS on CuS was confirmed by X-ray photoelectron spectroscopy, elemental mapping, scanning electron microscopy and high resolution transmission electron microsco… Show more
“…It exhibits seven major diffraction peaks related to the diffraction angles of 32.3 ° (101), 34.3 ° (102), 37.1 ° (103), 38.2 ° (006), 56.4 ° (110), 62.2 ° (108), and 70.2 ° (116), confirming the formation of a hexagonal covellite phase (CuS) that is in good agreement with the standard XRD pattern (Joint Committee for Powder Diffraction Standards, JCPDS card No. 24–0060) . The average nanocrystalline size (D) estimated by Debeye‐Scherrer equation based on the full width at half maximum of the most intense peak (110) was estimated to be about 20 nm, which supports the nanocrystalline size obtained from TEM images.…”
In this study, the copper sulfide nanoparticles (CuS‐NPs) and the zinc oxide/zinc hydroxide nanoparticles ((ZnO/Zn(OH)2‐NPs) were synthesized by a simple and low‐cost method, and the synthesized nanoparticles were characterized and identified by UV–Vis, field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM) and X‐ray diffraction (XRD). The antimicrobial activity of the CuS‐NPs and the ZnO/Zn(OH)2‐NPs were examined by broth dilution to determine the minimal inhibitory concentration (MIC) of antibacterial agent required to inhibit the growth of a pathogen and the minimum bactericidal concentration (MBC) required to kill a particular bacterium. Agar disc diffusion method was used to determine the zone of inhibition. The nanoparticles demonstrated potent antibacterial activity against Klebsiella pneumonia (ATCC 1827), Acinetobacter baumannii (ATCC 150504), Escherichia coli (ATCC 33218) and Staphylococcus aureus (ATCC 25293). Antifungal activity against Aspergillus oryzae (PTCC 5164) was also obtained. The data obtained from antimicrobial activities by broth dilution and agar disc diffusion methods exhibited the CuS‐NPs were more effective than the ZnO/Zn(OH)2‐NPs. A good correlation was observed between the data obtained by both methods.
“…It exhibits seven major diffraction peaks related to the diffraction angles of 32.3 ° (101), 34.3 ° (102), 37.1 ° (103), 38.2 ° (006), 56.4 ° (110), 62.2 ° (108), and 70.2 ° (116), confirming the formation of a hexagonal covellite phase (CuS) that is in good agreement with the standard XRD pattern (Joint Committee for Powder Diffraction Standards, JCPDS card No. 24–0060) . The average nanocrystalline size (D) estimated by Debeye‐Scherrer equation based on the full width at half maximum of the most intense peak (110) was estimated to be about 20 nm, which supports the nanocrystalline size obtained from TEM images.…”
In this study, the copper sulfide nanoparticles (CuS‐NPs) and the zinc oxide/zinc hydroxide nanoparticles ((ZnO/Zn(OH)2‐NPs) were synthesized by a simple and low‐cost method, and the synthesized nanoparticles were characterized and identified by UV–Vis, field emission scanning electron microscopy (FE‐SEM), transmission electron microscopy (TEM) and X‐ray diffraction (XRD). The antimicrobial activity of the CuS‐NPs and the ZnO/Zn(OH)2‐NPs were examined by broth dilution to determine the minimal inhibitory concentration (MIC) of antibacterial agent required to inhibit the growth of a pathogen and the minimum bactericidal concentration (MBC) required to kill a particular bacterium. Agar disc diffusion method was used to determine the zone of inhibition. The nanoparticles demonstrated potent antibacterial activity against Klebsiella pneumonia (ATCC 1827), Acinetobacter baumannii (ATCC 150504), Escherichia coli (ATCC 33218) and Staphylococcus aureus (ATCC 25293). Antifungal activity against Aspergillus oryzae (PTCC 5164) was also obtained. The data obtained from antimicrobial activities by broth dilution and agar disc diffusion methods exhibited the CuS‐NPs were more effective than the ZnO/Zn(OH)2‐NPs. A good correlation was observed between the data obtained by both methods.
“…In addition to these operational parameters, the band position and charge-carrier utilization of the photocatalysts also have an impact on the generation of reactive radicals and the subsequent photodegradation performance. To improve the carrier utilization and thereby achieve efficient reactive radical generation, heterostructure photocatalysts with enhanced photocatalytic activity are proposed and employed [18][19][20][21][22][23][24][25].…”
Due to its low cost, environmentally friendly process, and lack of secondary contamination, the photodegradation of dyes is regarded as a promising technology for industrial wastewater treatment. This technology demonstrates the light-enhanced generation of charge carriers and reactive radicals that non-selectively degrade various organic dyes into water, CO2, and other organic compounds via direct photodegradation or a sensitization-mediated degradation process. The overall efficiency of the photocatalysis system is closely dependent upon operational parameters that govern the adsorption and photodegradation of dye molecules, including the initial dye concentration, pH of the solution, temperature of the reaction medium, and light intensity. Additionally, the charge-carrier properties of the photocatalyst strongly affect the generation of reactive species in the heterogeneous photodegradation and thereby dictate the photodegradation efficiency. Herein, this comprehensive review discusses the pseudo kinetics and mechanisms of the photodegradation reactions. The operational factors affecting the photodegradation of either cationic or anionic dye molecules, as well as the charge-carrier properties of the photocatalyst, are also fully explored. By further analyzing past works to clarify key active species for photodegradation reactions and optimal conditions, this review provides helpful guidelines that can be applied to foster the development of efficient photodegradation systems.
“…Therefore, OH is a dominant reactive species that took part in the photodegradation of methylene blue over oleylamine-capped ZnS nanoparticles. As a result of hydroxyl radical scavenging, there is a possibility that the rate of reaction will increase due to reduction of electron-hole pair recombination [35,36].…”
"We report the preparation, morphological and photocatalytic studies of zinc sulfide nanoparticles from zinc(II) dithiocarbamate precursors. Powder X-ray diffraction patterns were index to the wurtzite crystalline phase of zinc sulfide while transmission electron microscopy micrographs revealed spherically shaped particles with sizes in the range 2.8 to 5.2 nm. The ZnS nanoparticles were used as photocatalysts for the degradation of methylene blue with degradation efficiency of 71.41% for ZnS1 and 85.95% for ZnS2 nanoparticles at pH 9.43. The effect of catalyst concentration, pH, radical scavengers, and hole (h+ ) scavengers on the photodegradation of methylene blue dye were evaluated."
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