Abstract
Dy-doped BiOCl powder photocatalyst was synthesized A one–step coprecipitation method. The incorporation of Dy3+ replaced partial Bi3+ in BiOCl crystal lattice system. For Rhodamine B (RhB) under visible light irradiation, 2% Dy doped BiOCl possessed highly efficient photocatalytic activity and photodegradation efficiency. The photodegradation ratio of RhB could reach 97.3% after only 30 min of photocatalytic reaction; this was more than relative investigations have reported in the last two years. The main reason was that the 4f electron shell of Dy in the BiOCl crystal lattice system can generate a special electronic shell structure that facilitated the transfer of electron from valance band to conduction band and separation of the photoinduced charge carrier. Apart from material preparation, this research is expected to provide important references for RhB photodegradation in practical applications.
Highlights
Photocatalytic technology using visible light irradiation is an environmentally-friendly approach towards environmental pollutant treatment
The diffraction peaks of all samples were fully indexed into BiOCl (JCPDS card number: PDF#06-0248) for the tetragonal system [12]
The Dy2O3 phase or other impurity peaks were not observed. This was indicated that Dy3+ substituted for Bi3+ in the BiOCl crystal lattice
Summary
Photocatalytic technology using visible light irradiation is an environmentally-friendly approach towards environmental pollutant treatment. Considering the stability of Bi3+, Bi3+-containing compounds, such as Bi2O3, BiVO4, Bi2WO6, BiPO4, BiFeO3, and BiOX (X = Cl, Br, I) [4], were synthesized for photocatalytic reactions Most of these compounds, especially BiOX (X = Cl, Br, I), possessed a layered structure and a plate-like appearance that could produce an internal electric field [5,6], which facilitated the migration of photoinduced carriers to some extent. Especially BiOX (X = Cl, Br, I), possessed a layered structure and a plate-like appearance that could produce an internal electric field [5,6], which facilitated the migration of photoinduced carriers to some extent Among these Bi3+-based photocatalysts, studies regarding the structure and properties of BiOCl were found. A total of 97.3% RhB could be degraded in only 30 min of photocatalytic reaction under visible light irradiation
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