Fast preparation of oxygen vacancy-rich 2D/2D bismuth oxyhalides-reduced graphene oxide composite with improved visible-light photocatalytic properties by solvent-free grinding

Bismuth oxyhalides (BiOX, X = Cl, Br, I) exhibit excellent photocatalytic activity owing to their distinctive layered structures and suitable bandgaps. However, BiOX its derived composites are usually fabricated via the liquid-phase strategy, which always produces waste liquid, thereby polluting environment. Recently, BiOX/reduced graphene oxide (RGO) with two-dimensional/two-dimensional (2D/2D) heterostructures have been successfully prepared without using any solvent by one-pot mixing/grinding chemicals such as bismuth nitrate pentahydrate, potassium halide, (GO), BH4K. The BiOX/RGO were endowed oxygen-rich vacancies a very short fabrication time of 15 min. During synthesis process, can grow in situ on GO due Bi3+ ions; thus, could be adsorbed easily surface, negatively charged oxygen-containing functional group. Significantly, BH4K not only reduces RGO but also introduces concentration oxygen (OVs) BiOX, photo-induce carrier separation efficiency effectively improve visible-light absorption. 2D/2D heterojunction structure provided higher specific surface area larger heterogeneous interface transferred photogenerated electrons regularly. Owing dual synergistic effects aforementioned features, produce more active substances (h+, •OH, •O2?) for photodegradation organic pollutants. results showed that performance BiOCl/RGO, BiOBr/RGO, BiOI/RGO was significantly improved degradation rate Rhodamine B (RhB) under irradiation 6, 3, 2 times than pure BiOCl, BiOBr, BiOI, respectively. Furthermore, displayed similar enhanced effect tetracycline degradation. Therefore, this work provides versatile, green, fast method synthesize different