Synthesis Of The Bismuth Oxyiodide And Study On Its Photocatalytic Properties

The shortage of the water resources and the deterioration of the water environment have awoke people's awareness of the crisis.Scientists are working together to develop new technologies and new materials to solve the water pollution problem.Photocatalytic technology which is low-cost,safe and suitable for the deep reaction is favored by a large number of researchers now.And the development of visible-light active photocatalysts becomes the top priority of the scientists' work.As a member of bismuth oxyhalides BiOX?X=Cl,Br,I?,BiOI has an unique layered structure,high photocatalytic activity and stability.Besides these,its bandgap is the narrowest among the three.Therefore,we adjust reaction conditions and hybridize g-C₃N₄ with BiOI to improve the p hotocatalytic degradation activity of BiOI.There is no doubt that reaction conditions exert a great influence on the synthesis of BiOI.When we increase the proportion of ethylene glycol in the solution,tiny,porous and uniform BiOI microspheres can be obtained.It is beneficial for the adsorption and degradation of acid methyl orange?MO?under visible light.In addition,BiOI samples synthesized from the solution of pH=3 exhibit the highest photodegradation activity.Compared with pure BiOI,g-C₃N₄/BiOI has a great improvement in photocatalytic activity because of its p-n heterostructure.The 70 wt% g-C₃N₄/BiOI sample exhibit the strongest capacity for the removal of RhB and MO.