DFT reveals I− can partially substitute CO32−to narrow the bandgap of Bi2O2CO3.
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Sodium citrate play a key role on the formation of rose-like I-doped Bi2O2CO3.
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Rose-like I-doped Bi2O2CO3 show enhanced visible light response.
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The catalyst has enhanced photocatalytic activity to organic and Cr(VI) pollutes.
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