Nanocrystalline Bi2O3–B2O3– (MoO3 or V2O5) glass-ceramic systems for organic pollutants degradation
Source abstract
Abstract
Abstract Fixation of photocatalyst in glass matrix would solve the problem of photocatalyst recovery. In this study, the system 30 Bi 2 O 3 , 20 B 2 O 3 and 50 (MoO 3 or V 2 O 5 ), was used for the preparation and stabilization of the photoactive phases of both bismuth molybdate β -Bi 2 Mo 2 O 9 and monoclinic–scheelite BiVO 4 in a glassy matrix. Proper heat-treatment schedule, based on differential thermal analysis (DTA) results, has been applied to improve the crystallinity of the prepared glass–ceramics. The applied heat-treatment program showed a significant effect on the size of the formed crystals, especially in samples with molybdenum content. For instance, one-step heat-treatment (500°C/2 h) improves the crystallinity of the material than two-step heat-treatment (355°C/1 h+400°C/2 h). It was also noticed that the amount of glassy matrix relative to crystalline part in case of vanadium-contained samples is much more than that in the corresponding molybdenum-contained samples. The prepared samples were used for the degradation of Red SPD Cotton dye in order to assess their photocatalytic activity. All molybdenum contained samples showed a promising photocatalytic activity. On contrary, vanadium-contained samples were inactive suggesting that most of photoactive crystals are in the bulk of materials.
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Research context
OpenAlex topics: Advanced Photocatalysis Techniques · Pigment Synthesis and Properties · Luminescence Properties of Advanced Materials
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References (29)
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