The Preparation And Photocatalytic Activity Of BiOBr Composition Materials

Three-dimensional flower-like Bi OBr has attracted considerable attention for degrading organic pollutants. The high specific surface area provided more active sites, and the special structure could harvest visible light and decrease of recombination opportunities of the photoexcited electron-hole pairs. However, the existence of the low quantum efficiency and limited visible light absorption, and the photocatalytic activities could further improved when made some modified.The Cu2 O quantum dots incorporated into three-dimensional flower-like BiOBr were synthesized via reductive solution chemistry. The Cu2 O QDs, with an average diameter of about 10 nm, were observed to adhere to the surface of the single layer of BiOBr, played an important role in improving the photocatalytic performance, due to the enhancement of visible light absorption efficiency as well as the efficient separation of the photogenerated charge carriers. The 3 wt% QDs-Cu2O/BiOBr could degrade of 95.0 % methylene blue(MB) under visible light irradiation for 60 min.The nano-dots BiOBr decorated Bi2WO6 fabricating p-n heterostructure photocatalysts were prepared by a solvothermal method, and the formation the p-n heterojunctions and the matched level structure could greatly accelerated the separation efficiency of photogenerated charge carriers. The 60 %BiOBr/Bi2WO6 composite showed the highest degrade rate for MB and about 99.0 % of MB(20 mg/L) could be degrade, meanwhile the possible photocatalytic mechanism was proposed.The Ag@AgBr/BiOBr composite were synthesized via a facile oil-in-water selfassembly method. The Ag@AgBr nanoparticles, possessed average diameters of 20 nm, were tightly adhered to the surface of the BiOBr. The surface plasmonic resonance(SPR) of Ag nanoparticles enhanced the visible light absorption efficiency and accelerated the separation of the photogenerated charge carriers. The results showed Ag@AgBr(15 wt.%)/BiOBr composite photocatalyst could degrade about 90 % of MB under visible light for 30 min.