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BiOI/BiVO4 p–n heterojunction with enhanced photocatalytic activity under visible-light irradiation
Zhenbo Xiang,Yi Wang,Dun Zhang,Peng Ju 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.40 No.-
A novel visible-light-sensitive BiOI/BiVO4 photocatalyst with a p–n heterojunction structure wassynthesized through a facile coprecipitation method. The physical and chemical properties of assynthesizedBiOI/BiVO4 composites were characterized by XRD, XPS, BET, SEM, EDS, HRTEM,photoluminescence spectrum and UV–DRS respectively. The photocatalytic activity of the preparedphotocatalysts was evaluated by photodegrading methylene blue and killing of Pseudomonas aeruginosa(P. aeruginosa) under visible light irradiation. The results showed that the 30%BiOI/BiVO4 (molar ratio ofI:V = 3:7) exhibits the higher photocatalytic activity than the pristine BiOI and BiVO4. Moreover, thesterilization mechanism involved in the photocatalytic disinfection process was studied by captivespecies trapping experiments. The result revealed that hydroxyl radical ( OH) and holes (h+) are the mainreactive species for killing of P. aeruginosa under visible light irradiation. In addition, after five recyclesfor killing of P. aeruginosa under visible light irradiation, 30%BiOI/BiVO4 does not exhibit significant lossof photocatalytic activity. The results confirm that the synthesized 30%BiOI/BiVO4 photocatalyst haslong-time reusability and good photocatalytic stability. The photocatalyst shows potential application inmarine antifouling.
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