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New Nanostructured Composites Could Clean Environment by Breaking Down Hazardous Dye

In a study published in the journal Catalysts, a hydrothermal approach was used to create zinc tungstate nanoparticles on reduced graphene oxide nanocomposites (ZnWO4[email protected]).

Synthesis, Characterization and Enhanced Visible Light Photocatalytic Performance of ZnWO4-NPs@rGO Nanocomposites

Study: Synthesis, Characterization and Enhanced Visible Light Photocatalytic Performance of ZnWO4[email protected] Nanocomposites. Image Credit: FreeProd33/

The nanocomposites were studied structurally, morphologically, optically, and photo-catalytically, and the photocatalysis capabilities of ZnWO4[email protected] nanocomposites for the breakdown of hazardous methylene blue dye (HMBD) in neutral media were investigated.

Zinc Tungstate – An Effective Photocatalyst

This latest research focuses on trying to recycle catalysts for multipurpose functions to minimize the expense of industrial substances for a wide variety of technical applications. The major emphasis of the work in this paper was on examining the effectiveness of the catalysis of recycled inexpensive materials for diverse purposes.

It is worth noting that substances of group VI-B (particularly tungsten) have very high efficiency in a variety of processes such as photocatalytic, electrocatalytic, and energy storage activities. Polluted water restoration is an essential approach to managing health hazards by eliminating natural contaminants from water using photocatalysis, which is among the most promising approaches for environmental cleanup.

(a) XRD patterns and (b) FTIR spectrum of synthesized ZnWO4-NPs@rGO nanocomposites.

 (a) XRD patterns and (b) FTIR spectrum of synthesized ZnWO4[email protected] nanocomposites.© Alhokbany, N., Alshehri, S. M., & Ahmed, J. (2021).

Nanocomposites based on semiconducting materials have been studied as inexpensive, well-performing photocatalytic materials for water contamination management. Zinc tungstate (ZnWO4) possesses a high bandgap energy and is an effective photocatalyst in the breakdown of aromatic dyes under UV light.

Dyes have already been found to be decomposed by zinc tungstate nanocomposites utilized for photocatalysis. The chemical recombination of electric charges in such substances, meanwhile, poses a difficulty for research. Introducing heteroatomic structures, carbon-based compounds, or ions of transition metal into a zinc tungstate matrix may thus be beneficial for producing effective charge isolation in semiconductors and so improving the effectiveness of photocatalysis. The combination of WO3 and ZnWO4 nanocomposites has facilitated excellent opposing charge segregation, leading to their use as effective photocatalytic materials.

Nanocomposites of Zinc Tungstate and Silver

Under ultraviolet light, Ag/ZnWO4 nanocomposites have demonstrated remarkable efficiency in the breakdown of methyl orange (MO) and methylene blue (MB) dyes. Zinc tungstate nanomaterials have also been employed for a variety of functions, such as extracting heavy metals and dyes, bacterial disinfection, and photoluminescence, in addition to their usage in elements of Li-ion cells and supercapacitors. Nonetheless, some studies report that dyes are not suitable agents for visible-light breakdown processes as they absorb photons and thus suppress the abilities of photocatalytic materials. For this reason, several transition metal nanomaterials such as tungstate, gallate, molybdate, and ferrite nanomaterials have been developed for an array of uses such as treating sewage water, supercapacitor applications, and electro-catalysis.

Modifying with Reduced Graphene Oxide

Researchers are interested in surface modification of semiconductive NPs with materials having high electric conductivity and large specific areas to effectively increase the photocatalytic performance and stability of inexpensive photocatalysts. Zinc oxide nanocomposites based on graphene have already been described as potential photocatalytic materials in chemical dye breakdown processes. Hence, the team created nanocomposites incorporating reduced graphene oxide layer supplemented zinc tungstate nanoparticles (ZnWO4[email protected]) for enhanced photocatalysis performance in neutral conditions. This research focused on the fabrication, analysis, and increased visible-light photocatalytic performance of ZnWO4[email protected] nanocomposites.

UVā€“Vis absorption spectrum of ZnWO4-NPs@rGO nanocomposites. Inset shows the band gap energy of ZnWO4-NPs@rGO nanocomposites.

UV–Vis absorption spectrum of ZnWO4[email protected] nanocomposites. Inset shows the band gap energy of ZnWO4[email protected] nanocomposites.© Alhokbany, N., Alshehri, S. M., & Ahmed, J. (2021).

Can ZnWO4[email protected] Photocatalysts be Recycled?

A major problem for commercial processes is the reusability of ZnWO4[email protected] photocatalysts. Illuminated under visible light, the reused photocatalysis performance of ZnWO4[email protected] nanocomposites was investigated for eight successive cycles. The breakdown of HMBD solutions via photocatalysis by ZnWO4[email protected] nanocomposites demonstrated outstanding reused efficiency.

The researchers discovered that recycled ZnWO4[email protected] photocatalysts effectively decomposed the HMBD solution for as many as eight repetitions. It should be noted that the ZnWO4[email protected] photocatalytic materials were rinsed with demineralized water numerous times after every cycle before being reused for the next one. According to the findings, ZnWO4[email protected] nanoscale composites perform well in photocatalysis for water treatment functions in environmental cleanup.

To Conclude

Hydrothermally produced ZnWO4[email protected] nanostructured composites were found to outperform pristine zinc tungstate NPs in photocatalysis. In two hours, the photocatalytic activity of ZnWO4[email protected] nanostructured composites for the breakdown of HMBD demonstrated exceptional results with about 98 percent dye breakdown, significantly superior to a lower 53 percent offered by pristine zinc tungstate photocatalysts. As a result, ZnWO4[email protected] nanostructured composites have the potential to be important photocatalysts for environmental cleanup and energy purposes.

Continue reading: How Microbes are Making Nanotechnology More Eco-Friendly.


Alhokbany, N., Alshehri, S. M., & Ahmed, J. (2021). Synthesis, Characterization and Enhanced Visible Light Photocatalytic Performance of ZnWO4[email protected] Nanocomposites. Catalysts, 11(12). Available at:

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Shaheer Rehan

Written by

Shaheer Rehan

Shaheer is a graduate of Aerospace Engineering from the Institute of Space Technology, Islamabad. He has carried out research on a wide range of subjects including Aerospace Instruments and Sensors, Computational Dynamics, Aerospace Structures and Materials, Optimization Techniques, Robotics, and Clean Energy. He has been working as a freelance consultant in Aerospace Engineering for the past year. Technical Writing has always been a strong suit of Shaheer's. He has excelled at whatever he has attempted, from winning accolades on the international stage in match competitions to winning local writing competitions. Shaheer loves cars. From following Formula 1 and reading up on automotive journalism to racing in go-karts himself, his life revolves around cars. He is passionate about his sports and makes sure to always spare time for them. Squash, football, cricket, tennis, and racing are the hobbies he loves to spend his time in.


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