Abstract
Cuttlefish bone (CFB) successfully stabilizes highly-negatively charged hollow α-Ag3VO4 nanospheres (19 nm) over its aragonite-layers, and sequentially subjects for decoration with yttria (Y) quantum dot-like particles (QDs). Carmine indigo (CI) dye, Escherichia Coli bacteria and Culex pipiens larvae are chosen as urgent-target pollutants in Egypt's wastewater. Such nanocomposites are examined as photocatalysts for CI degradation, bactericides and larvicides. Ag3VO4/CFB exhibits highly-sounded photocatalytic efficiency (∼97 %) of 1.5 times higher than Y@Ag3VO4/CFB with turning of light-irradiation from UV- to green-light level. Such visible-light-driven photocatalyst generates plenty of electron-hole pairs of developed separation efficiency and transference, governing direct hole oxidation pathway for CI (∼95 % mineralization) with efficient consecutive 6 cycles. Y@Ag3VO4/CFB is seeded as topgallant eco-friendly biocide displaying efficiencies near 100 %. Such lethal effect regards to firm-binding of decorated-yttria QDs to aragonite-layers, encouraging formation of large-sized silver vanadates (70 nm) allowing biological activity of vanadate ions to potentially contribute in the bio-killing act.
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