Preparation and photocatalytic properties of BiOCl/Bi2MoO6 composite photocatalyst
Introduction
Semiconductor photocatalysis was extensively studied for solving environmental and energy problems [1]. Because of the excellent photocatalytic property, Bi-based compounds are becoming promising materials among semiconductors [2]. BiOCl is a wide band gap semiconductor with layered structure in which halogen atom is located between [Bi2O2] layers [3]. It has been paid more attention due to its unique and outstanding optical, electrical, catalytic and magnetic properties [4], [5]. Our previous studies show that the properties of BiOCl material can be improved by controlling the microstructure and morphology[6], or doping some elements, compositing it with other semiconductors[7], [8]. Li et al. [9] synthesized BiOCl/Bi24O31Cl10 heterojunction with highly efficient activity through a self-combustion of ionic liquids route. Zhang et al. [10] synthesized Fe3O4/BiOCl nanocomposite, which showed a higher photocatalytic performance than that of single BiOCl. Our group reported the excellent photocatalytic properties of AgCl/BiOCl composite [11]. Bi2MoO6 possesses good photocatalytic activity under visible light. However, there is no report about the BiOCl/Bi2MoO6 composite. In this article, the BiOCl/Bi2MoO6 composite photocatalyst was synthesized through hydrothermal synthesis method. The photocatalytic activity was investigated by degrading methyl orange (MO) and phenol under visible light irradiation.
Section snippets
Experimental
Detailed synthesis process and characterization methods of samples was given in the supporting information.
Results and discussion
The XRD patterns of the samples are presented in Fig. 1. There are no other phases and peaks of impurities, demonstrating that all the samples are pure. BiOCl and Bi2MoO6 possess the phases corresponding to JCPDS numbers 06–0249 (a=3.891 Å and c=7.369 Å, Z=2) and 21–0102 (a=5.502 Å, b=16.213 Å, and c=5.483 Å). The XRD pattern of the BiOCl/Bi2MoO6 composite sample indicates the mixing of BiOCl and Bi2MoO6 phases. No other phase is detected in the BiOCl/Bi2MoO6 composite before and after the
Conclusion
In summary, the BiOCl/Bi2MoO6 composite photocatalyst was successfully synthesized using hydrothermal method. The SEM images showed that the microsphere was composed of hundreds of thin nanoplates, and some nanoparticles were strewn on the sphere with a diameter of 3 μm from the view of morphology. From the photodegradation of the MO organic dye and phenol, we found that the BiOCl/Bi2MoO6 composited photocatalyst displayed better photocatalytic activity than both single BiOCl and single Bi2MoO6.
Acknowledgment
This work was supported by National Natural Science Foundation of China (NSFC) (51172012).
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