A hierarchical Ag2O-nanoparticle/TiO2-nanotube composite derived from natural cellulose substance with enhanced photocatalytic performance

A series of hierarchical Ag 2 O-nanoparticle/TiO 2 -nanotube heterostructured nanocomposites with varied Ag 2 O contents were fabricated by employing natural cellulose substance as the template. The nanocomposites possessed fine three-dimensional porous network structures, which were composed of TiO...

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Bibliographic Details
Published in:Cellulose (London) 2019-07, Vol.26 (11), p.6683-6700
Main Authors: Lin, Zehao, Lu, Yongxin, Huang, Jianguo
Format: Article
Language:English
Subjects:
Bioorganic Chemistry
Cellulose
Ceramics
Chemistry
Chemistry and Materials Science
Composites
Glass
Heterostructures
Light irradiation
Methylene blue
Nanocomposites
Nanoparticles
Nanotubes
Natural Materials
Norfloxacin
Organic Chemistry
Original Research
Performance enhancement
Photocatalysis
Photodegradation
Physical Chemistry
Pollutants
Polymer Sciences
Rate constants
Rhodamine
Structural hierarchy
Sustainable Development
Titanium dioxide
Ultraviolet radiation
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Summary:A series of hierarchical Ag 2 O-nanoparticle/TiO 2 -nanotube heterostructured nanocomposites with varied Ag 2 O contents were fabricated by employing natural cellulose substance as the template. The nanocomposites possessed fine three-dimensional porous network structures, which were composed of TiO 2 nanotubes and fine Ag 2 O nanoparticles that anchored on the surfaces. The composites exhibited enhanced photocatalytic performances in degrading different organic pollutants under ultraviolet light irradiation. The optimal Ag 2 O-NP/TiO 2 -NT nanocomposites exhibited apparent rate constants of 0.62, 0.37 and 0.39 min −1 in photocatalytic degrading methylene blue, Rhodamine B and norfloxacin, respectively; which were correspondingly 2.6, 2.2, and 1.4 times higher than those of the pure TiO 2 nanotubes; and 3.9, 9.3, and 5.6 folds higher than those of the pure Ag 2 O nanoparticles. It was demonstrated that the improved photocatalytic performances of the nanocomposites were attributed to the hierarchical nanotubular structures that inherited from the natural cellulose substances and the effective heterostructure between the titania and silver oxide phases derived from the unique structure. Hence, the close relationship between the cellulose derived structures and the photocatalytic performances of the nanocomposites were demonstrated. The related possible photocatalytic mechanism was revealed that the separation and transfer of the photogenerated electron–hole pairs was accelerated, and the superoxide radicals and reactive holes played a main role in the photocatalytic processes. Graphic abstract
ISSN:0969-0239
1572-882X
DOI:10.1007/s10570-019-02573-z