Naslov
Effects of photodeposited cocatalyst on bismuth vanadate surface as an activator of hydrogen peroxide in photocatalytic degradation of ciprofloxacin

Autori
Popović, Marin ; Sharifi, Tayebeh ; Kovačić Marin ; Kraljić Roković, Marijana ; Kušić Hrvoje ; Peternel, Igor ; Lavrenčič Štangar, Urška ; Lončarić Božić, Ana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
The 25th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-25) & The 26th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-26) Abstracts / Al-Ekabi, Hussain - , 2022, 59-59

Skup
25th International Conference on Semiconductor Photocatalysis and Solar Energy Conversion (SPASEC-25) ; 26th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil (AOTs-26)

Mjesto i datum
Rostock, Njemačka, 29.08.2022. - 01.09.2022

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
photocatalysis ; bismuth vanadate ; iso-type homojunction ; cocatalysis ; photodeposition ; H2O2

Sažetak
Monoclinic bismuth vanadate is a n-type visible light photocatalyst. It has a suitable band gap for visible light absorption. Under visible light irradiation it can degrade most of (simple) organic dyes in a few hours. For degradation of complex molecules some type of modification (usually use of doping or composite construction) is required. Throughout enhancing via morphological change spherical isotype homojunction BiVO4 was synthesized with EDTA via precipitation method and calculation at 450 °C. That BiVO4 improved degradation of diclofenac for 2, 5 times compared to the monoclinic bismuth vanadate. To further improve the photocatalytic activity of the photocatalyst, silver and iron nanoparticles were photodeposited on its surface. Newly synthesized materials were analyzed with DRS, XRD, XPS, SEM, EDX and BET analysis. In this study, we explored the effect of this deposit on hydrogen peroxide activation in photocatalysis with hydrogen peroxide. To determine the best conditions and the best photocatalyst for ciprofloxacin (CIP) degradation response surface methodology was used. Two factors: pH (4, 6, 8) and concentration of H2O2 in comparison to CIP concentration (5, 17, 5, 30) were the same. Mass ration of precursor compound and pristine bismuth vanadate was used as a third variable [m (FeCl3 x 6xH2O) /m (BiVO4) (5%, 27, 5%, 50%)] for materials with iron, and ration [m (AgNO3) /m (BiVO4) (1%, 8%, 15%)] for materials with silver. Enhancement of photocatalytic degradation of materials with photodeposited iron can be explained with photo- Fenton reactions. For materials with silver enhancement in photocatalysis can be expanded via silver catalysed decomposition of hydrogen peroxide, a reaction which complete mechanism is not known. It is assumed that the decomposition is a reaction with a radical mechanism in which superoxide radicals play an important role.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Kemijsko inženjerstvo, Interdisciplinarne tehničke znanosti

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