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Deconvolution of the emission spectra of (a) Sr2Bi2O5 and (b) Sr3Bi2O6 into Gaussian components (1–4) obtained under excitation by UV light (λexc=365 nm). Curves 6 are the sums of the corresponding Gaussian profiles. The absorptances of the samples are also presented (curves 7): A0=1−R0, where R is the spectral diffuse reflectance coefficient.
Source publication
The low‐temperature photoluminescence (T<300 K) and UV‐induced formation of color centers of recently synthesized Sr2Bi2O5, Sr3Bi2O6 and Sr6Bi2O11 bismuthates are examined. The estimated Mott‐Seitz activation energies, ranging from 88 to 167 meV, correspond to various emission bands. Comparison of the response of all three bismuthates when exposed...
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Citations
The paper investigates the optical and photocatalytic properties of strontium bismuthate doped with various rare earth elements. The data presented indicate that the type and concentration of the dopant have different effects on such parameters of a given semiconductor photocatalyst, such as the optical bandgap, absorption in the intrinsic area, and photocatalytic activity. On the basis of the studies carried out, the most promising rare earth elements have been identified and their optimal concentrations have been established for doping alkaline earth metal bismuthates.
The photocatalytic properties of heterostructures comprised of various strontium bismuthates and bismuthyl carbonate were studied. Enhanced photocatalytic activity was found in SrxBiyOz/(BiO)2CO3 heterostructures for various strontium bismuthates. The enhanced photocatalytic activity in this type of heterostructure was found to arise from type II heterojunctions.
We report on the structure and properties of novel Sr2Bi2O5/SrCO3 and Sr3Bi2O6/SrCO3 heterostructures with SrCO3 content varying from 10 wt% to 90 wt%. Formation of the heterostructures is succeeded via sintering technique and according to XRD, SEM, and EDX studies has resulted in highly crystalline materials with well-defined carbonate-bismuthate interfaces. In the reaction of photodegradation of phenol in aqueous solution the heterostructures demonstrated photocatalytic activity exceeding that of TiO2. It is demonstrated that their photocatalytic action is due to the presence of type II semiconductor heterojunctions. The content of SrCO3 ensuring utmost photocatalytic activity is explained based on numerical modeling of the heterostructures’ formation using ‘Unity’ development platform. In addition, the heterostructures show photoluminescence. Its mechanism proposed here implies permeability of the materials’ heterojunctions to electrons. This work describes new materials that can be used for photodegradation of organic pollutants. Besides, it extends available principles of design of photocatalytically active heterostructures.
