Enhanced photocatalytic and antibacterial activities of novel Ag-HA bioceramic nanocatalyst for waste-water treatment

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 H2O2; silver dopant could initiate H2O2 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.

A Photocatalysis of CV Dye Under UV Light Degradation using Laboratory Prepared In(OH)3 And In2O3 By Hydrothermal Method: Nano-Matrrials For Dye Sensitive Solar Cell

“…Non-biodegradable pollutants in air and water are eliminated by using some semiconductors [1][2][3][4][5][6][7]. Usually, oxide semiconductors have higher band gap (5.5 eV).…”

“…It is for this reason, Indium oxide and hydroxide are studied exhaustibly for their physico-chemical properties as well as for their potential applications in various electronic fields [1,9]. In(OH)3 is observed to be an useful photocatalyst used for the removal of benzenes as compared to other materials such as P2O5, TiO2 [2][3][4][5][6][7]10]. It has now been accepted that In2O3 would be a suitable semiconductor for application in gas sensor, transparent conductors, solar cells and solid-state application devices [11].…”

Facile synthesis of silver doped manganese oxide nanocomposite with superior photocatalytic and antimicrobial activity under visible spectrum

“…Approximately 17–20% of global pollutants can be attributed to the textile industry, according to the World Bank estimates 4 . The persistent nature of these pollutants stems from the stability of water-soluble Azo dyes; that would result in prolonged environmental impacts 5 , 6 . Methyl Orange (MO) belongs to the azo dye family; it is known to be carcinogenic organic substance.…”