Photocurrent Response and Progesterone Degradation by Employing WO₃ Films Modified with Platinum and Silver Nanoparticles

Abstract

The effect of silver (Ag 0 ) and platinum (Pt 0 ) metallic nanoparticles (NPs) on WO 3 film was investigated by studying the photocurrent response under polychromatic irradiation. The structural phase revealed by X-ray diffraction analysis indicates a monoclinic crystal nanostructure. WO 3, Ag 0 /WO 3, and Pt 0 /WO 3 electrodes were used to degrade 0.35 mg L À 1 progesterone hormone in aqueous solution under polychromatic irradiation for 3h. The studies on degradation were investigated under electrochemically assisted heterogeneous photocatalysis (EHP) conditions. For photodegradation of progesterone, higher performance was achieved when WO 3 was functionalized and when the EHP configuration was adopted with bias at + 0.7 V vs Ag/AgCl. This study reveals that incorporation of metallic NPs onto a semiconductor increases its efficiency, thereby preventing electron-hole recombination in the photocatalyst and photoelectrochemical limitations of WO 3 due to surface plasmon resonance and the trapping state. Therefore, efficient advances in the degradation of organic contaminants during water treatment can be realized.[a] M.

Catalytic oxidation processes for the degradation of Progesterone using V2O5 catalyst and C/Ti anode: Optimization and degradation dynamics

“…It can be observed that most of the studies focus on analyzing PGT removal using HPLC technique that mostly indicates the transformation of PGT to other compounds and not its complete degradation. Application of photocatalysis was found to be incapable of complete degradation of PGT [13,14]. The only study that discussed the application of electrochemical advanced oxidation process (EAOP) concentrated on removing water soluble combination of PGT that is different from its synthetic form sold as medication.…”

“…The usage of costly conductive diamond electrodes for EAOP further limited its wide scale application [15,16]. Further, removal studies on PGT are limited compared to other steroid contaminants such as estradiol and testosterone [14,15].…”

Earth-Abundant Metal Oxides for Monolithic Tandem Photoelectrochemical Water Splitting Devices: Current Trends and Perspectives

“…Photovoltages of various photoanodes made up of BiVO 4 , − Fe 2 O 3 , − Cu 2 O, − and WO 3 − reported from the previous studies.…”

“…Consequently, BiVO 4 and other metal oxides exhibit considerably lower performances in comparison to what is anticipated from the Schottky-Queisser limit. Figure shows the performances of metal oxide photoelectrodes in terms of photovoltage reported from the previous studies on BiVO 4 , − Fe 2 O 3 , − Cu 2 O, − and WO 3 . − The photovoltages are estimated from the difference between the onset potentials where PEC devices begin to generate the current density from a targeted electrochemical reaction (HER for photocathode and OER for photoanode) and redox potential of the electrochemical reactions (0 V vs RHE for HER and 1.23 V vs RHE for OER). Although the performances of the metal oxide photoanode have significantly improved, there are still large discrepancies between the theoretical limit.…”