About Photocatalytic Properties of some Heterostructures Based on Strontium Bismuthate

Abstract

In the work, some heterostructures consisting of two different strontium bismuthates from the following series are investigated: Sr2Bi2O5, Sr3Bi2O6 and Sr6Bi2O11. It is shown that the creation of such heterostructures affects both optical and photocatalytic properties. The results obtained are promising for the further development and research of new heterostructures based on two different strontium bismuthates and for studying the characteristics of their photocatalytic activity.

Effect of Composition on the Optical and Photocatalytic Properties of Visible Light Responsive Materials Bi26–xMgxO40

“…One factor that enables such behavior is a recently established trend in the empirical dependence of valence and conduction band energy positions on the materials’ bandgaps . In contrast to calcium, − strontium, − and barium − bismuthates, which have been widely studied, little is known about magnesium bismuthates . The primary goal of our work is to elaborate a preparation route of monophase Bi 26– x Mg x O 40 samples that is followed by the study of their optical and photocatalytic properties.…”

Optical Properties of Various Strontium Bismuthates: Luminescence and UV‐induced Photocoloration

“…Bismuthates of various alkaline earth metals, primarily those of calcium, [1][2][3][4] strontium [5][6][7][8][9][10][11][12][13] and barium [14][15][16] have recently been investigated actively as photoactive materials. They are promising photocatalysts because they display high photocatalytic activity toward the decomposition of water, [9,15] the mineralization of various organic compounds, [5,7,8,[10][11][12][13][14][15] and toward the synthesis of organic molecules from carbon dioxide and water precursors. [16] An effective photocatalyst must possess two fundamental and, to some extent, compatible properties: (i) the most efficient band-to-band excitation of photocatalysts by visible (sunlight) light limits the bandgap energy to be E bg � 2.5-3.0 V; (ii) the redox potential difference of a particular photocatalytic reaction must be less than E bg .…”

“…Bismuthates of various alkaline earth metals, primarily those of calcium, strontium and barium have recently been investigated actively as photoactive materials. They are promising photocatalysts because they display high photocatalytic activity toward the decomposition of water, the mineralization of various organic compounds, and toward the synthesis of organic molecules from carbon dioxide and water precursors …”

Investigation of the Mechanism of Electric Conductivity of Strontium Bismuthate Sr₆Bi₂O₁₁

“…They can be used in water and air purification systems from organic pollutants [2][3][4][5][6], as an antibacterial material [6], for the production of hydrogen through the photocatalytic decomposition of water [7] or the recovery of carbon dioxide to produce solar fuel [8]. Also, the photocatalytic activity of bismuthates of various alkaline earth metals can be significantly increased by creating heterostructures with: bismuth oxide [9], alkaline earth metal carbonate [10][11] or other alkaline earth metal bismuthates [12].…”