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Identification of structural changes in CaCu3Ti4O12 on high energy ball milling and their effect on photocatalytic performance

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posted on 2023-10-27, 11:09 authored by Andrea Bartoletti, Angela Gondolini, Nicola Sangiorgi, Matteo Aramini, Matteo Ardit, Marzio Rancan, Lidia Armelao, Simon KondratSimon Kondrat, Alessandra Sanson

The perovskite CaCu3Ti4O12 is known for its ability to photocatalytically degrade model dye molecules using visible light. The influence of ball milling preformed CaCu3Ti4O12 on the catalysts structure and performance in the degradation of rhodamine B and the antihistamine cetirizine hydrochloride, which does not absorb light in the visible region, was investigated. The surface area of CaCu3Ti4O12 increased from 1 m2 g−1 to >80 m2 g−1 on milling with a retention of 96% CaCu3Ti4O12 phase purity, as determined by X-ray diffraction and extended X-ray absorption fine structure analysis. Multiple characterisation techniques showed an increase in structural defects on milling, including, for the first time, X-ray absorption near edge spectroscopy which showed changes in the local electronic structure from the perspective of Cu and Ti. Photocatalytic degradation was notably higher with the milled sample than that observed for the as-synthesized sample, even after normalisation for surface area, with a doubling of surface normalised rate constant from 4.91 × 10−4 to 9.11 × 10−4 L min−1 m2 for rhodamine B degradation and a tripling for cetirizine hydrochloride degradation from 2.64 × 10−4 to 7.92 × 10−4 L min−1 m−2. The improvement in catalytic performance can be correlated to the defects observed by X-ray absorption spectroscopy.

Funding

The Royal Society for funding through the International Exchanges grant (IES\R3\170381)

The UK Catalysis Hub -'Core'

Engineering and Physical Sciences Research Council

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The UK Catalysis Hub - 'Science': 1 - Optimising, predicting and designing new Catalysts

Engineering and Physical Sciences Research Council

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The UK Catalysis Hub - 'Science': 2 Catalysis at the Water-Energy Nexus

Engineering and Physical Sciences Research Council

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Hub 'Science' 3: Catalysis for the Circular Economy and Sustainable Manufacturing

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History

School

  • Science

Department

  • Chemistry

Published in

Catalysis Science and Technology

Volume

13

Issue

4

Pages

1041 - 1058

Publisher

Royal Society of Chemistry

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by the Royal Society of Chemistry under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/3.0/

Acceptance date

2022-12-20

Publication date

2022-12-21

Copyright date

2022

ISSN

2044-4753

eISSN

2044-4761

Language

  • en

Depositor

Deposit date: 26 October 2023

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