engleski

Cocatalytic effects of simultaneous silver and iron photodeposition onto the surface of Iso-type homojunction bismuth vanadate for enhancement of solar driven degradation of Ciprofloxacin

The presence of antibiotics in the environment may threaten both humans and wildlife because of their resistance and chronic toxicity. Ciprofloxacin (CIP) is one of the antibiotics included in the European Commission's Watch list which should be concerned for removal from groundwaters. Among the various strategies, the solar driven photocatalytic process using semiconductors appears to be one of the effective methods to remove antibiotics from aqueous solutions. In this research, a series of Ag and Fe-modified BiVO4 materials were co-precipitation method followed by simultaneous photodeposition of different amounts of Ag and Fe on the surface of BiVO4. Different time of photodeposition and precursor mass ratio were used as variables. The as-prepared materials were characterized via XRD, SEM/EDX, AFM and XPS to get insight into their morphology, structure and surface properties, while DRS, PL and electrochemical tests were used to elucidate their semiconducting properties. Immobilized photocatalyst, in a form of three layers on glass plates obtained by employing spin-coating, were used for photodegradation of CIP under stimulated sunlight irradiation at neutral conditions and with the addition of oxidant (H2O2) in order to determine degradation mechanisms and influence of water matrix constituents, as well as to correlate degradation pathways with the changes in biodegradability and toxicity.

photocatalysis ; bismuth vanadate ; iso-type homojunction ; cocatalysis ; photodeposition ; silver ; iron

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