Sputter -coated N-enriched mixed metal oxides (Ta 2 O 5 -Nb 2 O 5 -N) composite: A resilient solar driven photocatalyst for water purification.

Autor: Rajan ST; Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India., Senthilnathan J; Department of Civil Engineering, Indian Institute of Technology Madras, Chennai 600036, India. Electronic address: jsn@iitm.ac.in., Arockiarajan A; Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai 600036, India; Ceramic Technology Group -Center of Excellence in Materials and Manufacturing Futuristic Mobility, Indian Institute of Technology Madras (IIT Madras), Chennai 600036, India. Electronic address: aarajan@iitm.ac.in.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2023 Jun 15; Vol. 452, pp. 131283. Date of Electronic Publication: 2023 Mar 23.
DOI: 10.1016/j.jhazmat.2023.131283
Abstrakt: This study demonstrated the formation of N-enriched mixed metal oxides (Ta 2 O 5 -Nb 2 O 5 -N and Ta 2 O 5 -Nb 2 O 5 ) thin film composites used as photocatalysts to degrade P-Rosaniline Hydrochloride (PRH-Dye) dye under solar radiation. By controlling the N gas flow rate during the sputtering process, the N concentration in the Ta 2 O 5 -Nb 2 O 5 -N composite is significantly included, and demonstrated by XPS and HRTEM analysis. With the help of XPS and HRTEM investigations, it was determined that the addition of N to Ta 2 O 5 -Nb 2 O 5 -N significantly enhances the active sites. The Ta-O-N bond (N 1 s and Ta 4p 3/2 spectra) was verified by the XPS spectra. Ta 2 O 5 -Nb 2 O 5 was found to have a lattice interplanar distance (d-spacing) of 2.52, whereas Ta 2 O 5 -Nb 2 O 5 -N showed the 2.5 (620 planes). A sputter-coated Ta 2 O 5 -Nb 2 O 5 and Ta 2 O 5 -Nb 2 O 5 -N photocatalysts were prepared, and their photocatalytic activity was evaluated using PRH-Dye as a model pollutant under solar radiation by adding H 2 O 2 (0.01 mol). The photocatalytic activity of the Ta 2 O 5 -Nb 2 O 5 -N composite was compared with TiO 2 (P-25) and Ta 2 O 5 -Nb 2 O 5 . Ta 2 O 5 -Nb 2 O 5 -N showed very high photocatalytic activity compared to Degussa P-25 TiO 2 and Ta 2 O 5 -Nb 2 O 5 under solar radiation and confirmed the presence of N in Ta 2 O 5 -Nb 2 O 5 -N significantly increased the generation of ˙OH radicals (in pH 3, 7 and 9). With the use of LC/MS, the stable intermediates or metabolite created during the photooxidation of PRH-Dye were assessed. The results of this study will provide useful insights on how Ta 2 O 5 -Nb 2 O 5 -N influences the efficiency of water pollution remediation.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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