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Synthesis of hydroxylated group IV metal oxides inside hollow graphitised carbon nanofibers: nano-sponges and nanoreactors for enhanced decontamination of organophosphates

Astle, Maxwell A.; Rance, Graham A.; Fay, Michael W.; Notman, Stuart; Sambrook, Mark R.; Khlobystov, Andrei N.

Authors

Maxwell A. Astle

Graham A. Rance

Stuart Notman

Mark R. Sambrook

Andrei N. Khlobystov



Abstract

The confinement and enhanced catalytic properties of hydroxylated group IV metal oxide nanostructures inside hollow graphitised carbon nanofibers (GNF) has been demonstrated. GNF – a structural analogue of carbon nanotubes – were effectively filled with suitable precursor molecules of metal chlorides from the gas and liquid phases. Subsequent basecatalysed hydrolysis afforded amorphous, nanostructured hydroxylated metal oxide (MOx(OH)y where M = Zr, Ti, and Hf) thin films, which coat the internal surfaces of GNF. This versatile and general strategy allows the chemical composition and morphology of the encapsulated material to be modified by varying the conditions used for hydrolysis and post-synthesis thermal treatment. The increased Lewis acidic properties and high surface area of the zirconium composite promote the catalysed hydrolysis of dimethyl nitrophenyl phosphate (DMNP) – a toxic organophosphorus chemical. A four-fold enhancement in the rate of DMNP hydrolysis relative to its separate constituent components was observed, highlighting the surprising synergistic abilities of this composite material to perform both as a ‘nano-sponge’, absorbing the harmful compounds inside the GNF, and a nanoreactor, enhancing the local concentration of organophosphate around the hydroxylated metal oxide species, leading to improved catalytic performance.

Journal Article Type Article
Publication Date Oct 4, 2018
Journal Journal of Materials Chemistry A
Print ISSN 2050-7488
Electronic ISSN 2050-7496
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 6
Issue 41
Pages 20444-20453
APA6 Citation Astle, M. A., Rance, G. A., Fay, M. W., Notman, S., Sambrook, M. R., & Khlobystov, A. N. (2018). Synthesis of hydroxylated group IV metal oxides inside hollow graphitised carbon nanofibers: nano-sponges and nanoreactors for enhanced decontamination of organophosphates. Journal of Materials Chemistry A, 6(41), 20444-20453. doi:10.1039/c8ta08100j
DOI https://doi.org/10.1039/c8ta08100j
Keywords Renewable Energy, Sustainability and the Environment; General Materials Science; General Chemistry
Publisher URL https://pubs.rsc.org/en/Content/ArticleLanding/2018/TA/C8TA08100J#!divAbstract
Additional Information : This document is Similarity Check deposited; : Supplementary Information; : Maxwell A. Astle (ORCID); : Maxwell A. Astle (ResearcherID); : Graham A. Rance (ORCID); : Graham A. Rance (ResearcherID); : Michael W. Fay (ORCID); : Mark R. Sambrook (ORCID); : Andrei N. Khlobystov (ORCID); : Andrei N. Khlobystov (ResearcherID); : Single-blind; : Received 20 August 2018; Accepted 4 October 2018; Accepted Manuscript published 4 October 2018; Advance Article published 12 October 2018; Version of Record published 23 October 2018

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