Carbonate-doped TiO2 was prepared via a hypoxic carbonization method.
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A bidentate carboxylate linkage was formed between carbonate and TiO2 lattice.
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The electron-withdrawing carboxylate ligands can remarkably narrow the bandgap.
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Two possible mechanisms were elucidated based on the bidentate carboxylate linkage.
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Carboxylate chelate carbonate-doped TiO2 shows high photodegradation activity.
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