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Ti3C2Tx MXenes decorated black phosphorus nanosheets with boosted visible-light photocatalytic activity: experiment and theory studies

Abstract

Metal-free black phosphorus nanosheets (BP) have emerged as a promising photocatalyst. Herein, the 2D early transition-metal carbides and nitrides (MXenes) decorated BP (Ti3C2Tx/TiO2-BP 2D-2D) nanohybrids were constructed by hydrothermal method, in which the TiO2 was produced in hydrothermal processes. The optimized Ti3C2Tx/TiO2-BP nanohybrids exhibited a higher visible-light photodegradation efficiency of rhodamine B (99.09%) and tetracycline hydrochloride (92.70%) pollutants than that of pristine BP (12.75% and 9.35%, respectively). Diversified characterization techniques and density functional theory calculations have revealed that such enhanced photocatalytic performance was due to the synergistic effect of BP and Ti3C2Tx/TiO2, which could markedly improve the stability of BP, increase visible light absorption, prolong photoexcited electron lifetime, accelerate the photoinduced electron transfer and hinder the electron-hole (e--h+) pairs recombination. Meanwhile, the mechanism analysis indicated that •O2− radicals played a leading role in the photocatalytic process. This study will motivate great interest in using 2D MXenes as co-catalysts to enhance the activity of BP for its applications.

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Supplementary files

Article information


Submitted
12 Dec 2019
Accepted
01 Feb 2020
First published
03 Feb 2020

J. Mater. Chem. A, 2020, Accepted Manuscript
Article type
Paper

Ti3C2Tx MXenes decorated black phosphorus nanosheets with boosted visible-light photocatalytic activity: experiment and theory studies

B. Shao, J. Wang, Z. Liu, G. Zeng, L. Tang, Q. Liang, Q. He, T. Wu, Y. Liu and X. Yuan, J. Mater. Chem. A, 2020, Accepted Manuscript , DOI: 10.1039/C9TA13610J

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