Controllable Fabrication Of Bismuth Subcarbonate And Related Bismuth-containing Materials And Their Photocatalytic Activities

Nowadays,photocatalysis technology has received intensive attention due to its promising use in solving energy crisis and environmental remedies.Bismuth containing materials have become the representative among them for their low cost,simple way of preparation,morphology controllable performance and excellent photocatalytic activity,and the research direction has centered on the improvement of fabrication process and enhancement of photocatalytic efficiency.In this work,we have studied on the room temperature preparation,crystal facet engineering and heterostructure construction method of?BiO?₂CO₃ material,in order to improve its photocatalytic activity for pollutant degradation.The major contents are as follows:Firstly,by using dilute ammonia solution to dissolve bismuth citrate,water-soluble ammonia bismuth citrate solution was obtained,which could homogeneously react with aqueous Na₂CO₃ to form 3D hierarchical?BiO?₂CO₃ hollow microspheres in room temperature.And the as-prepared?BiO?₂CO₃ hollow microspheres performed enhanced photocatalytic activity in comparison with the flake-like sample obtained via hydrothermal method,due to its mesopores made by the aggregation of nanosheets.Based on the method above,Bi₂S₃/?BiO?₂CO₃ heterostructure compound was obtained in one step by adding mixed solution of Na₂CO₃ and TAA.The as-prepared sample showed efficient photodegradation performance for different kinds of organic dyes and colorless drugs,for its presented heterojunction structure.The study above provided a simple and easy way for the fabrication of bismuth containing materials and heterojunctions.Finally,BiOCl and?BiO?₂CO₃ nanosheets with highly exposed {001} facets were successfully obtained using urea as a kind of capping agent.And the exposure ratio of {001}facets can be easily adjusted by changing the quantity of urea added.More importantly,the as-prepared BiOCl-001 and?BiO?₂CO₃-001 nanosheets exhibited enhanced photocatalytic performance for the degradation of multiple pollutants,owing to the efficient transfer rate of photogenerated charge carriers assisted by the inner electric field.And the facets exposure mechanism was also studied in this part.