Liu Xinlin,Qin Yingying,Xing Guoliang,Li Chunxiang,Lang Jihui,Liu Yang,Xing Scott
In this paper, a novel type of core–shell structured ZnFe2O4@CdS composite photocatalyst is successfully synthesized by a facile two-step strategy method. The corresponding morphology, structure and optical properties of developed photocatalyst were well
characterized. The photocatalytic degradation of tetracycline (TC) experiments indicated that the ZnFe2O4@CdS core–shell exhibited a higher photocatalytic activity than the pure ZnFe2O4 and CdS under the visible light irradiation, especially
0.1 g ZnFe2O4@CdS composites with a content of 78 wt.% CdS resulted in 95.31% degradation of 20 mg/L TC in 90 min. with 0.1 g catalyst. Furthermore, the photodegradation mechanism was investigated by trapping experiments, which revealed that .O–2
was the most active species in the photodegradation process. And the possible process of charge transfer for ZnFe2O4@CdS composite photocatalyst was proposed based on the experimental results.
Zhichao Miao,Jiyao Tao,Shaoyuan Li,Jian Wu,Zhao Ding,Xiuhua Chen,Wenhui Ma,Hua-Jun Fan
The popcorn-shaped ZnFe 2 O 4 (ZFO) nanospheres has been produced by one-pot synthesis method. CdS nanoparticles (NPs) were subsequently loaded onto the surface of porous ZnFe 2 O 4 through the successive ion layer adsorption (SILAR) process. The microstructure, composition , and degradation ability of ZFO/CdS NPs composites have been examined in-depth. Under the four SILAR cycles, the resulting ZFO/CdS NPs (FS4) composite displayed the maximum degradation efficiency of 93.2% for rhodamine B (RhB) in 40 min, and which maintained high photocatalytic activity and a stable structure after five reuse. The heterojunction between CdS and ZFO can dramatically improves the separation efficiency of photo-generated electron-hole pairs, thus boosts catalytic activity. Meanwhile, the radical scavenging investigations have demonstrated that the superoxide radicals as the principal reactive group participate in the photocatalytic reactions. The proposed ZFO/CdS NPs composites shows high photocatalytic ability and convenient magnetic recycling. This work not only provide a practical green synthesis path, but also offers new insight onto the formation of high-efficiency heterojunction photocatalysts .
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