Titania/Chitosan-Lignin nanocomposite as an efficient photocatalyst for the selective oxidation of benzyl alcohol under UV and visible light

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dc.contributor.authorKhan, Ayesha
dc.contributor.authorGoepel, Michael
dc.contributor.authorLisowski, Wojciech
dc.contributor.authorŁomot, Dariusz
dc.contributor.authorLisovytskiy, Dmytro
dc.contributor.authorMazurkiewicz-Pawlicka, Marta
dc.contributor.authorGläser, Roger
dc.contributor.authorColmenares, Juan Carlos
dc.contributor.organizationInstitute of Physical Chemistry, Polish Academy of Sciencesen
dc.contributor.organizationInstitute of Chemical Technology, Leipzig University, Germanyen
dc.contributor.organizationFaculty of Chemical and Process Engineering, Warsaw University of Technology, Polanden
dc.date.accessioned2022-01-04T14:54:03Z
dc.date.available2022-01-04T14:54:03Z
dc.date.issued2021
dc.description.abstractDeveloping functional materials from biomass is a significant research subject due to its unique structure, abundant availability, biodegradability and low cost. A series of chitosan–lignin (CL) composites were prepared through a hydrothermal method by varying the weight ratio of chitosan and lignin. Subsequently, these CL composites were combined with titania (T) to form a nanocomposite (T/CL) using sol–gel and hydrothermal based methods. T/CL nanocomposites exhibited improved photocatalytic performance in comparison with sol–gel and hydrothermally prepared pristine titania (SGH-TiO2), towards the selective oxidation of benzyl alcohol (BnOH) to benzaldehyde (Bnald) under UV (375 nm) and visible light (515 nm). More specifically, the 75T/CL(25 : 75) nanocomposite (a representative photocatalyst from the 75T/CL nanocomposite series) showed very high selectivity (94%) towards Bnald at 55% BnOH conversion under UV light. Whereas, SGH-TiO2 titania exhibited much lower (68%) selectivity for Bnald at similar BnOH conversion. Moreover, the 75T/CL(25 : 75) nanocomposite also showed excellent Bnald selectivity (100%) at moderate BnOH conversion (19%) under visible light. Whereas, SGH-TiO2 did not show any activity for BnOH oxidation under visible light. XPS studies suggest that the visible light activity of the 75T/CL(25 : 75) nanocomposite is possibly related to the doping of nitrogen into titania from chitosan. However, according to UV-visible-DRS results, no direct evidence pertaining to the decrease in band-gap energy of titania was found upon coupling with the CL composite and the visible light activity was attributed to N-doping of titania. Overall, it was found that T/CL nanocomposites enhanced the photocatalytic performance of titania via improved light harvesting and higher selectivity through mediation of active radical species.en
dc.description.sponsorshipThis publication is part of a project that has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement no. 711859 and from the financial resources for science in the years 2017–2021 awarded for the implementation of an international co-financed project. Juan Carlos Colmenares would like to acknowledge the support from the National Science Centre, Poland, within OPUS-20 project number 2020/39/B/ST5/00076. Roger Gläser and Michael Goepel gratefully acknowledges support from the Leipzig Graduate School of Natural Sciences: Building with Molecules and Nano-objects (BuildMoNa) as well as from the Research Academy Leipzig.
dc.identifier.citationRSC Adv.,2021,11, 34996-35010en
dc.identifier.issn2046-2069
dc.identifier.urihttps://pubs.rsc.org/en/content/articlelanding/2021/ra/d1ra06500a
dc.identifier.urihttps://depot.ceon.pl/handle/123456789/20891
dc.language.isoen
dc.publisherRoyal Society of Chemistryen
dc.rightsUznanie autorstwa-Użycie niekomercyjne-Bez utworów zależnych 3.0 Polska*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/pl/*
dc.subjectnanocompositesen
dc.titleTitania/Chitosan-Lignin nanocomposite as an efficient photocatalyst for the selective oxidation of benzyl alcohol under UV and visible lighten
dc.typearticleen
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