Photocatalytic Degradation of Methylene Blue by ZnO/NiFe2O4 Nanoparticles

TL;DR

This study presents a novel solid-state synthesis of ZnO/NiFe2O4 nanocomposites that effectively degrade methylene blue dye under UV light, offering a promising solution for wastewater treatment.

Contribution

The paper introduces a new solid-state method for synthesizing ZnO/NiFe2O4 nanocomposites with high photocatalytic efficiency for dye degradation.

Findings

High degradation efficiency of methylene blue under UV light.

OH radicals and photoproduced holes are key species in degradation.

Recyclable nanocomposite suitable for wastewater treatment.

Abstract

This work reports the successful solid state synthesis of ZnO/NiFe2O4 nanocomposite by calcinations of both green synthesized ZnO nanorods and NiFe2O4 prismatic nanorods at high temperature (850 {\deg}C) for ten hours. These nanomaterials were characterized for structural, functional groups and morphological studies using XRD, FTIR and SEM respectively. The photocatalytic activity of the catalysts was assessed through photodegradation of methylene blue (MB) dye. The photocatalytic studies reveal that the ZnO/NiFe2O4 nanocomposite exhibits high degradation efficiency under UV light. The study shows that in the removal of MB solution by ZnO/NiFe2O4 nanoparticles, OH and photoproduced holes h+ are the main species. Preparation of ZnO/NiFe2O4 nanocomposite by coupling of NiFe2O4 with green synthesized ZnO in solid state method is the novelty of this report. The synthesized recyclable ZnO/NiFe2O4 nanocomposite has potential applications in the treatment of both domestic and industrial waste water.