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Photocatalytic performance of alkali metal doped graphitic carbon nitrides and Pd-alkali metal doped graphitic carbon nitride composites

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dc.abstract.enAlthough there are several reports about the beneficial performance of metal doped graphitic carbon nitrides (g-C3N4) in various photocatalytic reactions, the effect of different alkali metal dopants has not been studied systematically. Series of undoped, Li-, Na- and K-doped samples was synthetized and used for the preparation of novel type of photocatalysts, composed of palladium nanoparticles supported on alkali metals-doped graphitic carbon nitride. Palladium loading was achieved via citrate reduction of palladium precursor in the presence of the carbon nitride material. Several physicochemical characterization methods such as attenuated total reflection infrared-(ATR-IR), diffuse reflectance UV–visible spectroscopy, high-resolution transmission microscopy (HRTEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray powder diffraction (XRD), and thermogravimetric analysis (TGA) were used to get information about the morphology and composition of the novel composites. According to the optical characterization results, the band gap of g-C3N4 decreased upon Na- and K doping but increased after Li-doping. The palladium nanoparticles were distributed over the support and appeared in dispersed (undoped g-C3N4, Li-g-C3N4) or agglomerated (Na-g-C3N4, K-g-C3N4) form with individual particle size below 5 nm. The catalytic performance of these composite materials was tested in two processes: (i) photodegradation of methyl orange and (ii) hydrogen production from methanol. The Na- doping of graphitic carbon nitride was found to be a key issue to enhance hydrogen production. The carbon nitride matrix was found to be stable during the photocatalytic experiments, while the Pd component underwent certain changes during the photocatalytic reforming reaction of methanol. Our results indicated that the really acting metallic Pd cocatalyst was formed mainly in situ.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBystrzejewski, Michał
dc.contributor.authorSzijjártó, Gábor P.
dc.contributor.authorPászti, Zoltán
dc.contributor.authorTompos, András
dc.contributor.authorMihály, Judith
dc.contributor.authorTiwari, Santosh Kr.
dc.contributor.authorBaranowski, Piotr
dc.contributor.authorFronczak, Maciej
dc.contributor.authorTálas, Emília
dc.date.accessioned2024-01-25T16:36:21Z
dc.date.available2024-01-25T16:36:21Z
dc.date.issued2022
dc.description.financePublikacja bezkosztowa
dc.description.number1
dc.description.sdgAffordableAndCleanEnergy
dc.description.volume125
dc.identifier.doi10.1016/J.DIAMOND.2022.109006
dc.identifier.issn0925-9635
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/115820
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S0925963522001881?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationchemical sciences
dc.relation.ispartofDiamond and Related Materials
dc.relation.pagesart.no. 109006
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enGraphitic carbon nitride
dc.subject.enPalladium
dc.subject.enAlkali dopants
dc.subject.enHydrogen production
dc.subject.enPhotodegradation
dc.titlePhotocatalytic performance of alkali metal doped graphitic carbon nitrides and Pd-alkali metal doped graphitic carbon nitride composites
dc.typeJournalArticle
dspace.entity.typePublication