A Z-scheme CdS/Ag3PO4 catalyst: Characterization, experimental design and mechanism consideration for methylene blue.
Spectrochim Acta A Mol Biomol Spectrosc
; 288: 122139, 2023 Mar 05.
Article
em En
| MEDLINE
| ID: mdl-36446172
ABSTRACT
Due to the explosive use of Azo dyes in various industries such as textiles, discharging these industrial effluents into the environment critically polluted water supplies. Accordingly, constructing/developing novel binary catalysts to diminish the pollution extent of such effluents before discharging into environment is an excellent issue in environmental chemistry. Here, a binary CdS/ Ag3PO4 was constructed, and its boosted photocatalytic activity was proven against methylene blue (MB), as a model dye pollutant. The Wurtzite CdS and Ag3PO4 cubic crystal nanoparticles were synthesized and coupled mechanically. The binary sample's lowest photoluminescence (PL) results confirm a higher e/h separation. DRS results confirmed a decreased energy gap for the coupled system. The semiconductors' VB and CV potentials were calculated and used for constructing of Z-scheme mechanism. The photocatalytic activity was followed via an experimental design approach. The model F-value of 89.75 > F0.05,14,13 = 2.42 and LOF F-value of 6.57 < F0.05,10, 3 = 8.79 reveal that the model well processed data. The optimal run conditions were CMB 5 ppm, Catalyst dose 1 g/L, pH 3.25, and irradiation time 139 min, at which 85% of MB molecules were degraded. Based on the trend of ascorbic acid > isopropanol > formic acid ≈ nitrate obtained for the scavengers' importance in decreasing the photocatalyst activity, superoxide radicals had the highest effect in MB degradation and then â¢OH. The results showed the direct Z-scheme has the main effect on MB degradation by the binary sample.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Nanopartículas
/
Azul de Metileno
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article