Plasma-Sprayed Photocatalytic Zinc Oxide Coatings Publisher



Navidpour AH¹ ; Kalantari Y¹ ; Salehi M¹ ; Salimijazi HR¹ ; Amirnasr M² ; Rismanchian M³ ; Azarpour Siahkali M¹ Show Affiliations
Source: Journal of Thermal Spray Technology Published:2017

Abstract

Fabrication of semiconductor coatings with photocatalytic action for photodegradation of organic pollutants is highly desirable. In this research, pure zinc oxide, which is well known for its promising photocatalytic activity, was deposited on stainless-steel plates by plasma spraying. The phase composition and microstructure of the deposited films were studied by x-ray diffraction analysis and scanning electron microscopy, respectively. Despite the low-energy conditions of the plasma spraying process, the zinc oxide coatings showed good mechanical integrity on the substrate. Their photocatalytic activity was evaluated using aqueous solution of methylene blue at concentration of 5 mg L−1. The results showed the potential of the plasma spraying technique to deposit zinc oxide coatings with photocatalytic action under ultraviolet illumination. Ultraviolet–visible (UV–Vis) diffuse reflectance spectroscopy confirmed that the plasma spraying method could deposit zinc oxide films with higher photoabsorption ability relative to the initial powder. © 2017, ASM International.