How Ginger Extract Affects Eco-Friendly ZnO Catalysts

David Palenski
25th January, 2024

How Ginger Extract Affects Eco-Friendly ZnO Catalysts

These electron microscope images reveal how increasing the concentration of ginger extract during synthesis transforms zinc oxide nanostructures from simple nanoflakes (b) into complex, flower-like arrangements (e, f).

Image adapted from: Aliannezhadi et al. / CC BY (Source)
Zinc oxide nanoparticles (ZnO NPs) are utilized in a wide range of applications, from UV protection in sunscreens to antimicrobial coatings and catalysts. Traditional methods for producing these nanoparticles often involve harsh chemicals and high energy consumption, raising environmental concerns. Consequently, there’s growing interest in “green” synthesis methods – environmentally friendly approaches using biological sources[2]. These methods aim to create nanoparticles with comparable or even improved properties while minimizing harm to the environment. A significant challenge currently facing many industries is the treatment of acidic wastewater and factory effluent, and ZnO NPs show promise in this area. Researchers at Semnan University have recently investigated using ginger extract as a green alternative for synthesizing ZnO NPs specifically for this purpose[1]. The study focused on how varying the concentration of ginger extract affects the characteristics and performance of the resulting ZnO NPs. Ginger extract acts as both a reducing agent – providing electrons to form the ZnO nanoparticles – and a capping agent – controlling their size and shape. The researchers found that using lower concentrations of ginger extract (less than 25 mL) resulted in the formation of pure, hexagonal-shaped ZnO. As the concentration of ginger extract increased, so did the size of the resulting ZnO crystals. Interestingly, the morphology – the shape and structure – of the nanoparticles also changed. Low ginger extract concentrations produced nanoflakes, while higher concentrations led to the development of more complex, flower-like structures. The specific surface area (SSA) of the nanoparticles, a crucial factor in their catalytic activity, was also significantly impacted by the ginger extract concentration. SSA refers to the total surface area of the material available for chemical reactions. The highest SSA (27.7 m²/g) was achieved using 10 mL of ginger extract, indicating a greater number of active sites for pollutant degradation. The study also demonstrated that the ginger extract influenced how the nanoparticles interacted with light, specifically in the ultraviolet (UV) region. This is important because UV light can activate the nanoparticles, enhancing their ability to break down pollutants. The band gap energy – a property determining how efficiently a material absorbs light – varied between 3.09–3.20 eV (indirect) and 3.32–3.38 eV (direct) depending on the ginger extract concentration. The effectiveness of the synthesized ZnO NPs was then tested by measuring their ability to degrade methylene blue, a common dye used as a model pollutant. The results showed a strong correlation between ginger extract concentration and photocatalytic efficiency. Nanoparticles made with 5 mL of ginger extract achieved degradation rates of 44% at a pH of 4.3 and 83% at a pH of 5.6. This demonstrates the potential of ginger-derived ZnO NPs for treating acidic wastewater. This research builds upon previous work demonstrating the viability of green synthesis methods for ZnO NPs using other natural sources[2][3]. For example, studies have shown that pomegranate seed molasses can be used to create defective ZnO NPs with enhanced photocatalytic activity[3], and orange peel extract can produce antibacterial ZnO NPs[4]. These earlier studies highlight the potential of utilizing agricultural waste products – like ginger, pomegranate seeds, and orange peels – to create valuable nanomaterials. The current study expands on this by demonstrating the specific impact of extract concentration on the resulting nanoparticle properties and performance, particularly in the context of acidic wastewater treatment. The findings from Semnan University are particularly relevant because many industrial effluents are acidic, and traditional photocatalysts often perform poorly under these conditions. The ability of ginger-derived ZnO NPs to effectively degrade pollutants in acidic solutions represents a significant advancement. The study provides valuable insights into tailoring the synthesis process to optimize nanoparticle characteristics for specific applications, paving the way for more sustainable and efficient environmental remediation technologies.

EnvironmentBiochemSpices

References

Main Study

1) The physical properties and photocatalytic activities of green synthesized ZnO nanostructures using different ginger extract concentrations.

Published 23rd January, 2024

https://doi.org/10.1038/s41598-024-52455-z

Related Studies

2) A Review on Green Synthesis, Biomedical Applications, and Toxicity Studies of ZnO NPs.

https://doi.org/10.1155/2018/3569758

3) Green synthesis of spongy Nano-ZnO productive of hydroxyl radicals for unconventional solar-driven photocatalytic remediation of antibiotic enriched wastewater.

https://doi.org/10.1016/j.jenvman.2020.110961

4) Green synthesis of ZnO nanoparticles using orange fruit peel extract for antibacterial activities.

https://doi.org/10.1039/d0ra04926c


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