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It has been demonstrated that bismuth oxyhalides [BiOX (X = Cl, Br, and I)] nano‐crystals can efficiently behave as photocatalysts both under visible light and UV light. Different types of dyes, phenols, etc. can be degraded by bismuth oxyhalides materials efficiently, for the purification of wastewater. The raw materials used in the synthesis of bismuth oxyiodide (BiOI) are pure Bi2O3, halide salt,...
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