Hydrothermal growth of ZnO nanorods on Zn substrates and their application in degradation of azo dyes under ambient conditions

Abstract

ZnO nanorod arrays on Zn substrates with different definite crystal surfaces can efficiently degrade azo dyes (Congo red and methyl orange) under ambient conditions, requiring neither light illumination nor additional energy (agitation, ultrasonic, <italic>etc.</italic>).