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Journal of Nanoparticle Research

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01.12.2020 | Research paper

Amorphous carbon nanotube residue modification of solgel-synthesized C-, N-doped TiO₂ for photocatalytic applications

Erschienen in: Journal of Nanoparticle Research | Ausgabe 12/2020

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Abstract

The work reports an investigation into the role played by the carbon residue from low-quality amorphous carbon nanotubes (aCNTs) and nitrogen doped aCNTs (aNCNTs) in the properties of solgel-synthesized TiO₂ and NTiO₂. The resutant modified nanohybrids are compared to nitrogen-doped TiO₂ where the N is sourced from an ethylenediamine as an organic C and N precursor. The presence of carbon originating from ethylenediamine was confirmed by TGA and DTA while additional C doping originating from aCNT and aNCNT residues was confirmed by EDS and XRD spectroscopic techniques. XRD spectroscopy further demonstrated that the carbonaceous material residues resulted in the formation of TiC in TiO₂–aCNT nanohybrids, and carbon nitride in NTiO₂–aCNT nanohybrids. The TiC promoted photocatalytic performance of TiO₂–aCNT nanohybrids while the carbon nitride residue increased charge recombination and thereby hampering the photocatalytic performance of NTiO₂. A strong correlation exists between the optical properties and the photocatalytic performance in that NTiO₂ has the lowest E_g (2.84 eV), second lowest charge recombination rate, and a high 2nd-order rate constant for the kinetics for CR dye removal. The TiO₂–aCNT nanohybrids have the best overall performance in terms of dye adsorption, color removal through chemisorption, and UVA 254 TOC removal due to its low charge recombination. Therefore, the introduction of the carbonaceous materials into TiO₂significantly increases the adsorption capacity. Lastly, the presence of N in the carbonaceous materials further impedes the photocatalytic activity as observed by the low photocatalytic performance of NTiO₂–aNCNT and TiO₂–aNCNT nanohybrids.

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Titel: Amorphous carbon nanotube residue modification of solgel-synthesized C-, N-doped TiO2 for photocatalytic applications
Publikationsdatum: 01.12.2020
Erschienen in: Journal of Nanoparticle Research / Ausgabe 12/2020
Print ISSN: 1388-0764
Elektronische ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-020-05089-x

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