Nanostructured TiO2 photocatalyst modified with Cu for improved imidacloprid degradation

Čižmar, Tihana; Panžić, Ivana; Capan, Ivana; Gajović, Andreja (2021) Nanostructured TiO2 photocatalyst modified with Cu for improved imidacloprid degradation. Applied Surface Science, 569 . ISSN 0169-4332

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Abstract

We investigated the role of Cu(II) ions, their local atomic structure and chemical state in the Cu-modified immobilized nanostructured TiO2 photocatalysts used for imidacloprid degradation under UV/VIS-radiation. Catalyst samples were prepared via electrochemical anodization and modified with different Cu concentrations (0.2–1 M). The catalysts’ structure and morphology were characterized by X-ray diffraction, Raman spectroscopy, Scanning Electron Microscopy and Energy Dispersive X-ray spectroscopy, UV–VIS-NIR spectroscopy, Photoluminescence spectroscopy and X-ray absorption spectroscopy: extended X-ray absorption fine structure and X-ray absorption near edge structure. The EXAFS results indicate formation of Ti–O–Cu connections, suggesting that the Cu(II) cations are attached to TiO2 surface which contributes to the photocatalytic activity improvement, i.e. Cu(II) ions are free electron traps that reduce high recombination rate of photo generated charge carriers. The results here demonstrate the role of Cu(II) cations on photocatalytic activity of the Cu@TiO2 photocatalyst.

Item Type:	Article
Uncontrolled Keywords:	nanostructured TiO2; Cu(II) modifications;Cu K-edge XANES and EXAFS; Heterogeneous photocatalysis; Imidacloprid oxidation
Subjects:	NATURAL SCIENCES > Physics
Divisions:	Division of Materials Physics
Projects:	Project title Project leader Project code Project type Nanokompoziti s perovskitima za fotovoltaike, fotokatalizu i senzoriku-NanoPeroPhotoSens Andreja Gajović; Vilko Mandić; Milivoj Plodinec; Davor Gracin; Nikša Krstulović; Jelena Macan; Igor Lukačević; Maja Varga; Matko Mužević; Denis Stanić; Ivana Grčić; Marko Petric; Igor Petrović; Ivana Melnjak; Lucija Radetić; Andreja Žužić IP-2018-01-5246 HRZZ Nanokompoziti s perovskitima za fotovoltaike, fotokatalizu i senzoriku-NanoPeroPhotoSens Andreja Gajović; Vilko Mandić; Milivoj Plodinec; Davor Gracin; Nikša Krstulović; Jelena Macan; Igor Lukačević; Maja Varga; Matko Mužević; Denis Stanić; Ivana Grčić; Marko Petric; Igor Petrović; Ivana Melnjak; Lucija Radetić; Andreja Žužić IP-2018-01-5246 HRZZ Fenomeni na površini tijekom priprave naprednih nanokompozita infiltracijom i funkcionalizacijom poroznih materijala-SLIPPERYSLOPE Vilko Mandić UIP-2019-04-2367 HRZZ Fotonaponska-geopolimerna fasada: uloga vode-kisika u naprednom sklapanju filmova kompozitnih materijala-PV-WALL Vilko Mandić; Maja Mičetić; Luka Pavić; Ivan Brnardić; Igor Jajčinović; Zrinka Švagelj PZS-2019-02-1555 HRZZ
Depositing User:	Sanja Jurković
Date Deposited:	01 Dec 2022 12:39
URI:	http://fulir.irb.hr/id/eprint/7656
DOI:	10.1016/j.apsusc.2021.151026

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