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BiOI/Bi 2 O 3 heterostructures, prepared by a facile chemical etching method, exhibit excellent photocatalytic activities on the degradation of phenol and 4-chlorophenol (4-CP). The enhanced photocatalytic performance of BiOI/Bi 2 O 3 samples is attributed to the efficient separation of electron–hole pairs caused by the formation of BiOI–Bi 2 O 3 heterojunction...
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