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Phase Engineering of TiO 2 /MXene Heterostructure Nanosheets for Enhanced Photocatalysis.

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Title: Phase Engineering of TiO 2 /MXene Heterostructure Nanosheets for Enhanced Photocatalysis.
Authors: Huang, Yuntao1,2 (AUTHOR), Chen, Zibo1,2 (AUTHOR), Gong, Zhenyu1,2,3 (AUTHOR), Dai, Zhihong1,2,4 (AUTHOR), Chen, Cheng1,3 (AUTHOR), He, Daping1,2,4 (AUTHOR)
Source: Materials (1996-1944). Jun2026, Vol. 19 Issue 12, p2663. 10p.
Subjects: Titanium dioxide, Photocatalysis, Photodegradation, Holes (Electron deficiencies), Composite materials
Abstract: TiO2-based heterostructures have attracted considerable attention in photocatalytic pollutant degradation owing to their enhanced photoresponse and improved charge separation. The phase structure of TiO2 strongly affects its band structure and interfacial charge-transfer behavior, making phase structure control critical for optimizing photocatalytic performance. However, due to the small difference in free energy among TiO2 phase structure and the strong dependence of TiO2 nucleation and growth on the local reaction environment, it remains challenging to precisely control the phase structure of TiO2 in the TiO2-based heterostructure nanomaterials. Herein, we achieved the phase engineering of TiO2/MXene heterostructure nanomaterials through a solvent-regulation strategy. Specifically, by regulating the acetonitrile/water ratio in the hydrothermal solvent, TiO2 with distinct phase structures was in situ grown on hydrothermally treated MXene nanosheets, resulting in two representative TiO2/MXene heterostructure nanosheets: anatase TiO2/MXene and rutile TiO2/MXene. Acetonitrile likely acted as a surface-adsorbing agent during TiO2 formation, stabilizing the anatase phase and promoting the preferential formation of anatase TiO2. Benefiting from the optimized heterostructure, TiO2/MXene heterostructure nanosheets promoted the generation of singlet oxygen (1O2), leading to enhanced photocatalytic degradation. [ABSTRACT FROM AUTHOR]
Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 194907737
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PubType: Academic Journal
PubTypeId: academicJournal
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  Label: Title
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  Data: Phase Engineering of TiO 2 /MXene Heterostructure Nanosheets for Enhanced Photocatalysis.
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  Data: <searchLink fieldCode="JN" term="%22Materials+%281996-1944%29%22">Materials (1996-1944)</searchLink>. Jun2026, Vol. 19 Issue 12, p2663. 10p.
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  Data: <searchLink fieldCode="DE" term="%22Titanium+dioxide%22">Titanium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Photocatalysis%22">Photocatalysis</searchLink><br /><searchLink fieldCode="DE" term="%22Photodegradation%22">Photodegradation</searchLink><br /><searchLink fieldCode="DE" term="%22Holes+%28Electron+deficiencies%29%22">Holes (Electron deficiencies)</searchLink><br /><searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: TiO2-based heterostructures have attracted considerable attention in photocatalytic pollutant degradation owing to their enhanced photoresponse and improved charge separation. The phase structure of TiO2 strongly affects its band structure and interfacial charge-transfer behavior, making phase structure control critical for optimizing photocatalytic performance. However, due to the small difference in free energy among TiO2 phase structure and the strong dependence of TiO2 nucleation and growth on the local reaction environment, it remains challenging to precisely control the phase structure of TiO2 in the TiO2-based heterostructure nanomaterials. Herein, we achieved the phase engineering of TiO2/MXene heterostructure nanomaterials through a solvent-regulation strategy. Specifically, by regulating the acetonitrile/water ratio in the hydrothermal solvent, TiO2 with distinct phase structures was in situ grown on hydrothermally treated MXene nanosheets, resulting in two representative TiO2/MXene heterostructure nanosheets: anatase TiO2/MXene and rutile TiO2/MXene. Acetonitrile likely acted as a surface-adsorbing agent during TiO2 formation, stabilizing the anatase phase and promoting the preferential formation of anatase TiO2. Benefiting from the optimized heterostructure, TiO2/MXene heterostructure nanosheets promoted the generation of singlet oxygen (1O2), leading to enhanced photocatalytic degradation. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Materials (1996-1944) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/ma19122663
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        Text: English
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      – TitleFull: Phase Engineering of TiO 2 /MXene Heterostructure Nanosheets for Enhanced Photocatalysis.
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            NameFull: Huang, Yuntao
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              Text: Jun2026
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              Y: 2026
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