article · Scientific Reports
Researchers developed silver-doped hydroxyapatite nanorods measuring 60 nanometres in length using hydrothermal processing. Hydroxyapatite is a widely used bioceramic that serves as a catalyst support. The addition of silver intensified the negative charge on the surface of the catalyst, which enhanced the chemisorption of positively charged pollutants such as crystal violet dye. Spectroscopic analysis revealed that silver reduced the binding energy of valence electrons for oxygen, calcium, and phosphorus, thereby promoting light absorption and electron-hole pair generation. Working synergistically with hydrogen peroxide, the nanocomposite facilitated the release of reactive hydroxyl radicals to achieve an 88 percent removal efficiency for crystal violet. Additionally, the composite demonstrated notable antibacterial properties against Staphylococcus aureus, producing an 18.0 millimetre zone of inhibition and achieving 91.1 percent biofilm inhibition.
Industrial effluents frequently contain both persistent chemical dyes and dangerous bacterial pathogens. Conventional treatment materials often degrade pollutants without resisting microbial growth. By incorporating silver into a hydroxyapatite base, this material achieves dual functionality, offering effective breakdown of organic contaminants and potent inhibition of bacterial biofilms to support cleaner, greener wastewater treatment processes.
The technology could enable dual-action purification systems for wastewater treatment, targeting facilities that handle biological contamination alongside organic dye effluents. Potential users include municipal water utilities and industrial effluent management operators. At present, the findings reflect early-stage laboratory research evaluated on model dye solutions and bacterial cultures, with no demonstration of pilot-scale deployment or real-world industrial effluent testing indicated in the abstract.
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Abstract Hydroxyapatite (HA), the most common bioceramic material, offers attractive properties as a catalyst support. Highly crystalline mono-dispersed silver doped hydroxyapatite (Ag-HA) nanorods of 60 nm length was developed via hydrothermal processing. Silver dopant offered enhanced chemisorption for crystal violet (CV) contaminant. Silver was found to intensify negative charge on the catalyst surface; in this regard enhanced chemisorption of positively charged contaminants was accomplished. Silver dopant experienced decrease in the binding energy of valence electron for oxygen, calcium, and phosphorous using X-ray photoelectron spectroscopy XPS/ESCA; this finding could promote electron–hole generation and light absorption. Removal efficiency of Ag-HA nanocomposite for CV reached 88% after the synergistic effect with 1.0 mM H 2 O 2 ; silver dopant could initiate H 2 O 2 cleavage and intensify the release of active ȮH radicals. Whereas HA suffers from lack of microbial resistance; Ag-HA nanocomposite demonstrated high activity against Gram-positive ( S. aureus ) bacteria with zone of inhibition (ZOI) mm value of 18.0 mm , and high biofilm inhibition of 91.1%. Ag-HA nanocompsite experienced distinctive characerisitcs for utilization as green bioceramic photocatalyst for wastewater treatment.
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DOI: 10.1038/s41598-023-40970-4
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