Titania/chitosan-lignin nanocomposite as an efficient photocatalyst for the selective oxidation of benzyl alcohol under UV and visible light
This journal is © The Royal Society of Chemistry..
Developing 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.
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| Medienart: |
E-Artikel |
| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:11 |
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| Enthalten in: |
RSC advances - 11(2021), 55 vom: 25. Okt., Seite 34996-35010 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Khan, Ayesha [VerfasserIn] |
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Date Revised 20.06.2023 published: Electronic-eCollection ErratumIn: RSC Adv. 2022 Feb 9;12(8):4972. - PMID 35427085 Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1039/d1ra06500a |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM340235136 |
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| 500 | |a ErratumIn: RSC Adv. 2022 Feb 9;12(8):4972. - PMID 35427085 | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a This journal is © The Royal Society of Chemistry. | ||
| 520 | |a Developing 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 | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Goepel, Michael |e verfasserin |4 aut | |
| 700 | 1 | |a Lisowski, Wojciech |e verfasserin |4 aut | |
| 700 | 1 | |a Łomot, Dariusz |e verfasserin |4 aut | |
| 700 | 1 | |a Lisovytskiy, Dmytro |e verfasserin |4 aut | |
| 700 | 1 | |a Mazurkiewicz-Pawlicka, Marta |e verfasserin |4 aut | |
| 700 | 1 | |a Gläser, Roger |e verfasserin |4 aut | |
| 700 | 1 | |a Colmenares, Juan Carlos |e verfasserin |4 aut | |
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