摘要: Bismuth oxyhalide photocatalytic materials including BiOCl,BiOBr and BiOI have attracted extensive consideration as an inexpensive and advanced photocatalysts due to their attractive energy band structure and unique layered struct... 展开 Bismuth oxyhalide photocatalytic materials including BiOCl,BiOBr and BiOI have attracted extensive consideration as an inexpensive and advanced photocatalysts due to their attractive energy band structure and unique layered structure,which is appropriate for wide range of applications as such as solar energy conversion and environmental remediations.However,its real-world applications are still shackled by some intrinsic and intractable challenges such as low specific surface area,high photoinduced electron-hole recombination,lower separation and diffusion of charge carriers and spontaneous structural growth into large size leading to their limited photocatalytic activity.The research work in this thesis primarily emphases on the fabrication of bismuth oxyhalide photocatalysts via efficient,facile,cost-effective and environmental friendly synthetic routes.The synthesized products have extraordinary physical/chemical properties and thus exhibit the enhanced photocatalytic activity towards the decontaminate of diverse environmental pollutants.The main results and new findings in this work are summarized as follows: (1)In this chapter,unlike the conventional high temperature(110~180℃)methods,we described the first straightforward Poly(sodium4-styrenesulfonate)(PSS)-mediated synthetic path for the mass production of BiOCl-UTNs in an open-vessel at room-temperature.As-prepared BiOCl-UTNs are ultrathin(3~5nm)with planar dimensions of30~50nm.The investigation about the formation process of BiOCl-UTNs revealed that the strong electrostatic interaction occurred between[PSS]-and[Bi2O2]2+layers which restricted the growth rate of BiOCl nanoplates along<001>direction and results BiOCl-UTNs.The electrolyte sedimentation process governed by Na+ions permit the facile collection as well as mass production of BiOCl-UTNs.The as-prepared BiOCl-UTNs showed high photocatalytic activity for the decontamination of organic dyes and antibiotics.improved light absorption ability,large specific surface area,and quick separation and transmission of the photoexcited charge carriers which turn out to be the reasons for the high photocatalytic activity of BiOCl-UTNs. (2)In this part of thesis,different from the conventional BiOCl nanoplates having smooth surfaces(BiOCl NPLs-SSs),we report the synthesis of unprecedented BiOCl nanoplates with surface pits(BiOCl NPLs-SPs)via PVP-mediated solvothermal method and displays its superior activity for the degradation of environmental pollutants.It is found that the surface pits generated in BiOCl NPLs-SPs are due to the inhomogeneous adsorption of PVP on{001}planes of BiOCl.Owing to the high-density surface pits,the BiOCl NPLs-SPs displays not only large specific surface area and improved light absorption capability,but also possess plentiful low-coordination atoms,catalytic reaction active sites and adsorption sites.Such remarkable properties enable the quick separation and transfer of photoexcited carriers,resulting BiOCl NPLs-SPs with eminent photocatalytic activity for the degradation of antibiotics(ciprofloxacin),organic dyes(Rhodamine B,methyl orange,methyl blue)and industrial chemicals(bisphenol-A).Interestingly,by adjusting halogen salts,the present method is extendable to obtain BiOBr NPLs-SPs and BiOI NPLs-SPs with surface pits. We believe that this research is not only great addition in the synthesis of semiconductor photocatalysts,but also it opens the new and effective way for the future exploration of bismuth based oxyhalide nanomaterials for other potential applications. 收起