Plant-Mediated Synthesis of NiO Nanoparticles for Textile Dye Degradation in Water: A Review

Abstract

Water contamination caused by dyes from increased human activities, in particular usage in the textile sector, has led to high rates of disposal of both natural and synthetic dyes in the water stream, affecting the color and the ability of the light to penetrate through the water system. Several methods have been used for the removal of these organic pollutants. However, due to the complex nature of these dyes, researchers have geared toward advanced oxidation processes (AOPs). This method allows for the degradation of these pollutants into more environmentally friendly pollutants. Green synthesis of known catalysts has been on the rise, in particular nickel oxide (NiO) NPs. This material has been shown to have the ability to degrade several pollutants. However, due to the high recombination rate and large bandgap, their limitation has also been highlighted along with the importance of modification. Thus, it is important to understand the work and progress made on green NiO as a photocatalyst for the degradation of dyes and the latest advancements in the field.