article · Journal of Materials Research and Technology
A green, rapid microwave synthesis method was developed to manufacture plasmonic silver nanoparticles combined with Degussa titanium dioxide, using banana waste peduncles as the reducing agent. Chemical analysis identified bioactive compounds in the agricultural waste, including gallic acid, catechin, chlorogenic acid, and caffeic acid. The resulting spherical nanocomposite responds to solar-light irradiation and achieved complete photocatalytic degradation of methylene blue, along with the reduction of chromium (IV) within sixteen minutes. The composite remained photochemically stable across eight operating cycles. In biological evaluations, the material displayed potent antimicrobial activity against Staphylococcus aureus, Escherichia coli, Candida albicans, and Aspergillus niger. Furthermore, testing demonstrated cell viability with up to 94.85 percent cell migration at higher concentrations, highlighting both functional efficiency and biocompatibility.
Hazardous chemicals and costly processes are often required to manufacture functional nanomaterials. Converting abundant agricultural waste, such as banana peduncles, into active nanoparticles offers a low-cost and environmentally friendly alternative. Demonstrating high photocatalytic breakdown of chemical dyes, rapid reduction of heavy metals, and broad antimicrobial activity shows how biogenic materials can contribute to cleaner wastewater treatment and infection control.
The findings point towards potential applications in industrial wastewater remediation, heavy metal removal, and antimicrobial sanitisation. Prospective users include environmental remediation operators, water treatment facilities, and healthcare product developers. Because the material was evaluated under controlled laboratory conditions for cycle stability, metal reduction, and cell migration, the technology is currently at an early, laboratory-validated stage of development.
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Plasmonic silver nanoparticle, AgNPs (~14.1 nm) having an absorption peak at 421 nm was fabricated via a biogenic, rapid, and costless technique using Banana Waste Peduncles (BWP) as new disposals instead of plant extracts. According to HPLC analysis, BWP included gallic acid, catechin, chlorogenic acid, caffeic acid, etc. Degussa (P25) has been in-situ added in one-step to AgNPs using the microwave synthesis to produce nanocomposite sensitive to solar-light irradiation. Transmission electron microscope (TEM) images showed incorporation of P25 over plasmonic AgNPs grown by spherical shape. Based on the photocatalytic process, methylene blue (MB) was fully degraded, and 16 min was sufficient for chromium (IV) reduction. AgNPs/Degussa nanocomposite is photochemical stable even after eight cycles. Besides, the antimicrobial activity indicated the capability of the nanocomposite, as an efficient antimicrobial agent for killing and prevent the diffusion of the nominated microbes; Staphylococcus aureus, Escherichia coli, Candida albicans, and Aspergillus niger due to the synergistic effect of AgNPs. The cell viability showed up to 94.85% reliable cell migration, particularly at higher concentrations. The significant improvement of photoactivity and stability of the as-synthesized photocatalysts might be relevant for their reusability in practical applications.
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DOI: 10.1016/j.jmrt.2020.12.035
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