Synergistic effects of octahedral TiO2-MIL-101(Cr) with two heterojunctions for enhancing visible-light photocatalytic degradation of liquid tetracycline and gaseous toluene

Jinfeng Chen; Xiaodong Zhang; Xiaoyu Shi; Fukun Bi; Yang Yang; Yuxin Wang

doi:10.1016/j.jcis.2020.06.042

Synergistic effects of octahedral TiO₂-MIL-101(Cr) with two heterojunctions for enhancing visible-light photocatalytic degradation of liquid tetracycline and gaseous toluene

J Colloid Interface Sci. 2020 Nov 1:579:37-49. doi: 10.1016/j.jcis.2020.06.042. Epub 2020 Jun 12.

Authors

Jinfeng Chen¹, Xiaodong Zhang², Xiaoyu Shi¹, Fukun Bi¹, Yang Yang¹, Yuxin Wang³

Affiliations

¹ School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China.
² School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China. Electronic address: fatzhxd@126.com.
³ Institute of Applied Biotechnology, Taizhou Vocation & Technical College, Taizhou, Zhejiang 318000, China.

PMID: 32570029
DOI: 10.1016/j.jcis.2020.06.042

Abstract

The photocatalytic performance of TiO₂ is severely restricted by its low photocatalytic activity and high charge-carrier recombination rate. In order to overcome these defects, a novel octahedral TiO₂-MIL-101(Cr) (T-MCr) photocatalyst with type-II heterojunction and surface heterojunction is prepared by growth of TiO₂ particles on MIL-101(Cr) via optimizing the synthesis conditions. The physicochemical, optical and photoelectrochemical properties of the samples are characterized utilizing several techniques, and its photocatalytic activity for liquid tetracycline and gaseous toluene degradation is evaluated under visible light irradiation. Particularly, the T-MCr-60 shows the outstanding photocatalytic activity. The improved photocatalytic performance of T-MCr-60 is ascribed to strong interfacial contact between (0 0 1) facets, (1 0 1) facets, and MIL-101 and the synergistic effects of two heterojunctions promoting efficient charge transfer. The possible photocatalytic mechanisms involving pollutants degradation pathway and charge transfer mechanisms during the process of pollutants degradation is also discussed.

Keywords: MOFs; Surface heterojunction; Synergistic effects; TiO(2); Type-II heterojunction.