A Hierarchical H3pw12o40/Tio2 Nanocomposite With Cellulose As Scaffold For Photocatalytic Degradation Of Organic Pollutants
SEPARATION AND PURIFICATION TECHNOLOGY(2021)
摘要
By applying the natural cellulose substance (e.g., ordinary laboratory filter paper) scaffold as the structural template, a series of nanotubular H3PW12O40/TiO2 (HPW/TiO2) composites with various contents of the H3PW12O40 component were fabricated, which perfectly inherited the hierarchically porous network structure of the original cellulose substance. The optimal HPW/TiO2 nanocomposite with a H3PW12O40 content of 15.6 wt% delivered an apparent rate constant of 0.54 min(-1) towards the photocatalytic degradation of methylene blue (initial concentration: 10.0 mg L-1) under UV light, revealing an increment of 1.9 times in comparison with the pure TiO2 nanotubes sample. Moreover, when the cellulose scaffold was served as a support, the obtained HPW/ TiO2/cellulose composite sheet exhibited excellent photocatalytic performance as a photocatalytic membrane for the photocatalytic degradation of organic pollutants directly under outdoor sunlight. Thanks to the three dimensionally interwoven structures and the compact contact in-between the H3PW12O40 and TiO2 phases, the hierarchical HPW/TiO2 nanocomposites and the HPW/TiO2/cellulose composite sheet represented outstanding and recyclable photocatalytic performances. The possible photocatalytic mechanism was investigated to demonstrate that the photo-induced holes dominated the photocatalytic reaction.
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关键词
Photocatalysis, Nanocomposite, Polyoxometalate, Cellulose, Biomimetic synthesis
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