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In-situ synthesized porphyrin polymer/TiO2 composites as high-performance Z-scheme photocatalysts for CO2 conversion

Authors :
Guo-Lei Zhang
Yue Zhang
Tian-Yi Yang
Tianhao Zhang
Yu-Ting Wang
Zhihan Ma
Ying-Hui Zhang
Source :
Journal of Colloid and Interface Science. 596:342-351
Publication Year :
2021
Publisher :
Elsevier BV, 2021.

Abstract

The promising photocatalytic conversion of CO2 into valuable fuel promotes the development of photocatalyst through various methods. In this work, TiO2 nanoparticle was composited with covalent porphyrin polymers (COP-Ps) to fabricate composite photocatalysts. The resultant COP-Ps/TiO2 composites by in situ hydrothermal method exhibit much improved photocatalytic activity for the conversion of CO2 into CO relative to two components, and it is attributable to improved charge transfer between two moieties led by strong interaction. Especially, TiO2 is composited more evenly with the sulfonated hollow COP-P (sh-COP-P). The resultant composite sh-COP-P/TiO2 performs best with a CO production rate of 5.70 μmol·g−1·h−1, which is approximately 20.4 times as high as that of pure TiO2 and 2.3 times of sh-COP-P polymer. For comparison, the simple physical mixture of sh-COP-P and TiO2 (sm-sh-COP-P/TiO2) was fabricated, and it performs more badly due to poor mixing uniformity. A Z-scheme photocatalytic mechanism was proposed for sh-COP-P/TiO2 composite on the basis of energy band analysis and hydroxyl radical test. This study provides a new in situ strategy to fabricate organic polymer/metal oxide composites of high photocatalytic activity for CO2 reduction.

Details

ISSN :
00219797
Volume :
596
Database :
OpenAIRE
Journal :
Journal of Colloid and Interface Science
Accession number :
edsair.doi...........84542cc58e4572c48d62d12a232dffd3