Study On The Improvement Of Photocatalytic Performance By The Regulation Of Morphology And Light Absorption On Bi₂O₂[?BO₂?OH]

Nowadays,the world is facing increasingly serious energy and environmental problems.As a kind of clean,efficient and environmental friendly technology,photocatalytic technology has a very considerable prospect in pollutant treatment,energy catalysis and many other fields.Bi₂O₂[?BO₂?OH]?BiOB?is a newly reported layered Bi based photocatalysis material.Compared with the traditional photocatalytic material,BiOB has the advantages of the absorption edge close to the visible light region,simple structure which easy to design,but it still has the disadvantages of low photocatalytic activity and the unmodified sample can not absorb the visible light.In this paper,a series of modification studies have been carried out to improve the photocatalytic performance of BiOB materials,the main research is as follows:?1?BiOB nanosheets were prepared by one-step hydrothermal method,and then the morphology of BiOB nanosheets was controlled by adding several surfactants,such as SDBS,SC,CTAB,PVP,etc.The experimental results showed that SDBS-BiOB with the obviously smaller size has the highest photocatalytic activity.In the degradation experiments of BPA and TC,SDBS-BiOB showed the best degradation performance,and the degradation speed is more than 4 times of the unmodified BiOB.Further study on the mechanism of the improvement showed that the longitudinal size of SDBS-BiOB material has been significantly reduced,which makes the path of photocarrier migration much shorter,leading to the higher intensity of photocurrent and stronger photocatalytic performance.?2?Through the surface treatment method of simple agitation in aqueous solution,I-ion surface modification was carried out on the surface of SDBS modified BiOB material,so that its color changed significantly,and it became a visible-light responsive photocatalytic material?I-BiOB?.The degradation experiment shows that the performance of I-BiOB is significantly improved compared with that without I icons.Meanwhile,it has excellent degradation performance for a variety of different pollutants,which benefits from a large number of active species produced by I-BiOB under simulated sunlight.Further research showed that the improvement of photocatalytic performance of I-BiOB material is not only due to the improvement of light absorption performance,but also the remarkable enhancement of charge separation performance.The reason is that the surface modification changed the surface charge distribution of the BiOB material,which makes the surface of the material polarized.