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Abstract
A cotton fibers (CFs)-based AgI-decorated graphene oxide (GO) hybrid was designed and fabricated as a glass tube-“just fillable” photocatalytic filtration material for high-efficiency degradation of organic contaminants. It was found that AgI of smaller grain size and β/γ heterolayers can be in-situ grown on GO-modified CFs so that active sites are more exposed and interfacial charge separation becomes more validated. GO coupling plays key roles both in widening optical absorption window to potentiate a green light photoactivity and in promoting charge transfer to improve photocatalysis. The γ-AgI phase is easily reduced after several initial photocatalytic reactions, transforming to a β-AgI-Ag0-GO interface which brings about a subsequent stable photocatalysis. Good photocatalytic degradation efficiency toward toxic and carcinogenic azo dyes was achieved in a dynamic filtration stream under LED excitation. These results indicate feasibility of the simply in-situ grown hybrid as the possible candidate filter material for scalable industrial wastewater treatment applications.
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