Facile Synthesis of Solar Active Charcoal Passivated Ag3/PO4 and Their Two-Channel Mechanisms for H2O2 Formation in Aerated Water

Owolabi Mutolib Bankole, Olayinka S. Adanlawo, Kehinde I. Ojubola, Faith O. Adeyemi, Ojodomo J. Achadu, Ogunniyi A. Joseph, Segun E. Olaseni, Adeniyi S. Ogunlaja

Research output: Working paperPreprint

Abstract

This work presents the use of activated charcoal passivated-Ag<sub>3</sub>PO<sub>4</sub> (CAgP) and bare Ag<sub>3</sub>PO<sub>4</sub> (AgP) nanoparticles (NPs) as effective photocatalysts for the generation of hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>) in air-saturated water containing either formic acid (FA) or silver nitrate (AgNO<sub>3</sub>). The synthesized CAgP and pristine AgP were characterized using various state-of-the-art optical and electron microscopy techniques. The CAgP composites showed remarkable photocatalyzed H<sub>2</sub>O<sub>2</sub> formation compared to bare AgP NPs. The CAgP photocatalyzed-assisted H<sub>2</sub>O<sub>2</sub> formation from O<sub>2</sub> -saturated water under sunlight was achieved via two-channel mechanisms. First, in the presence of FA as a hole scavenger, enhanced H<sub>2</sub>O<sub>2</sub> formation was facilitated by decomposition of FA to produce proton (H<sup>+</sup>), followed by a spontaneous reduction of dissolved molecular oxygen by the photo-excited electrons. The second photocatalytic pathway involves the formation of H<sub>2</sub>O<sub>2</sub> in the absence of electrons (using AgNO<sub>3</sub> as an electron scavenger) which occurred via oxidation of H<sub>2</sub>O by photo-induced holes to generate hydroxyl radicals ( ● HO) and the combination of photogenerated ● HO to produce H<sub>2</sub>O<sub>2</sub>. The most notable feature of CAgP composite as a photocatalyst is the ease of H<sub>2</sub>O<sub>2</sub> formation in O<sub>2</sub>/H<sub>2</sub>O and O<sub>2</sub>/H<sub>2</sub>O/FA system, as well as the ability to reuse the recovered CAgP catalyst for a few reaction cycles without losing substantial catalytic activity or mass.
Original languageEnglish
PublisherSSRN
DOIs
Publication statusPublished - 23 Apr 2022

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