Abstract
ZnWO4 nanoparticles on reduced graphene oxide (ZnWO4-NPs@rGO) nanocomposites were synthesized using the hydrothermal method. Structural, morphological, optical, and photocatalytic studies of the ZnWO4-NPs@rGO nanocomposites were successfully investigated. Photo-catalytic performances of the ZnWO4-NPs@rGO nanocomposites were examined for the degradation of hazardous methylene blue dye (HMBD) in a neutral medium. ZnWO4-NPs@rGO nanocomposites show superior photo-catalytic performances over pure ZnWO4 nanoparticles. ZnWO4-NPs@rGO nanocomposites degrade ~98% dye while pure ZnWO4 nanoparticles degrade ~53% dye in 120 min. The prepared nanocomposites also show excellent recycled photo-catalytic efficiencies over multiple cycles.
Highlights
The recycling of catalysts for multifunctional purposes is currently receiving the attention of scientists, to reduce the cost of commercial materials for a diverse range of technological uses
We focus on the catalytic efficiency of reused cost-effective materials for various applications
It is noteworthy that the compounds belonging to group VI-B showed tremendous efficiencies in various applications including as photo-catalysis [1,2,3,4], electro-catalysis [5,6], and for energy storage [7,8]
Summary
The recycling of catalysts for multifunctional purposes is currently receiving the attention of scientists, to reduce the cost of commercial materials for a diverse range of technological uses. Zinc tungstate (ZnWO4) has large band gap energy (3.5–3.7 eV) and is used as an efficient photo-catalyst in the degradation of organic dyes under ultraviolet (UV) radiation [1,14]. ZnWO4 nanostructured materials used as photo-catalysts were previously reported to degrade dyes [15,16,17,18,19]. Functionalization of the semiconducting nanoparticles with materials that have high electrical conductivities and surface areas is an interest of researchers for the effective improvement of the catalytic activities and stabilities of low-cost photo-catalysts. Graphene-based zinc oxide [39,40,41] nanocomposites were previously reported as promising photo-catalysts in organic dye degradation reactions. This report is mainly focused on the synthesis, characterization, and enhanced visible-light photo-catalytic efficiencies of the synthesized ZnWO4-NPs@rGO nanocomposites
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