Photocatalytic decomposition of methylene blue by Cr/TiO2 composite coatings. (3rd April 2021)

• Record Type: Journal Article
• Authors: Shi, Y.J.; Li, J.W.; Wang, X.Y.; Chen, X.B.; Yu, Z.P.
• Is Part Of: Surface engineering. Volume 37:Number 4(2021)
• Page Start: 472
• Page End: 481
• Publication Date: 2021-04-03
• Subjects: MAO -- Ratio -- Currents‌ -- TiO2 -- Cr/TiO2 -- Photocatalytic; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2020.1742990
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: In this research, the Cr/TiO2 composite coatings were formed in Na2 HPO4 + NaOH + Cr2 O3 by micro-arc oxidation (MAO) technology with different ratios of anodic and cathodic currents. Surface morphology results showed that the pancake-like structures on the coating surface decreased with the ratio decreased. XRD results showed the TiO2 :Cr 3+ coatings are composed of anatase and rutile phase and the anatase content first increased and then decreased. XPS results indicated that Ti2p spin–orbit components of the Cr/TiO2 composite coatings are shifted towards higher binding energy, compared with the pure TiO2 coating, suggesting that some of the Cr 3+ ions are incorporated into TiO2 lattice. The photocatalytic experiment results showed that the photocatalytic activity of Cr/TiO2 MAO coatings can be greatly enhanced with a moderate amount of Cr 3+ .