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J Colloid Interface Sci. 2018 Jun 1;519:255-262. doi: 10.1016/j.jcis.2018.02.070. Epub 2018 Feb 27.

Effect of pH on the microstructure of β-Ga2O3 and its enhanced photocatalytic activity for antibiotic degradation.

Author information

1
Henan Key Laboratory of Rare Earth Functional Materials, International Joint Research Laboratory for Biomedical Nanomaterials of Henan, The Key Laboratory of Rare Earth Functional Materials and Applications, Zhoukou Normal University, Zhoukou 466001, PR China.
2
University Research Facility in Materials Characterization and Device Fabrication, The Hong Kong Polytechnic University, Hong Kong, PR China.
3
Department of Chemistry, Zhoukou Normal University, Zhoukou 466001, PR China.
4
Henan Key Laboratory of Rare Earth Functional Materials, International Joint Research Laboratory for Biomedical Nanomaterials of Henan, The Key Laboratory of Rare Earth Functional Materials and Applications, Zhoukou Normal University, Zhoukou 466001, PR China. Electronic address: lilili@zknu.edu.cn.
5
Henan Key Laboratory of Rare Earth Functional Materials, International Joint Research Laboratory for Biomedical Nanomaterials of Henan, The Key Laboratory of Rare Earth Functional Materials and Applications, Zhoukou Normal University, Zhoukou 466001, PR China. Electronic address: zlwang2007@hotmail.com.

Abstract

Semiconductor photocatalysis has become the focus of recent research on antibiotic treatment because it is a green and efficient technology. In this study, α-GaOOH with several novel microstructures has been synthesized at a low temperature and its subsequent thermal transformation. The influence of pH on the synthesis of α-GaOOH is studied, and the results indicate that pH played an important role in the microstructures of α-GaOOH and β-Ga2O3. All Ga2O3 samples possess macro-mesoporous network structures and exhibits a remarkable photocatalytic activity for antibiotic degradation. The photoelectron chemical tests show that the separation efficiency of photogenerated charge carriers of Ga2O3-7.0 is higher than that of other Ga2O3. The enhanced photocatalytic activity of Ga2O3-7.0 is mainly ascribed to its morphology and oxygen vacancy. The active species trapping and photoluminescence measurement experiments indicate that OH and O2- are the major active species contributing to the photocatalytic process. This study will bring about the potential application in treatment of the antibiotic pollutants.

KEYWORDS:

Ga(2)O(3); Metronidazole; Oxygen vacancy; Photocatalysis; Tetracycline

PMID:
29505987
DOI:
10.1016/j.jcis.2018.02.070
[Indexed for MEDLINE]

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