Electrospinning Construction And Photocatalysis Of Bismuth Oxyhalides Low-dimensional Nanomaterials

Photocatalytic technology offers the potential for elimination of contaminants and toxic chemicals in the environment owing to its high efficiency and broad applicability. Bismuth oxyhalides（BiOX, X=F, Cl, Br, I） are important semiconductive materials which exhibit photocatalytic activity under ultraviolet light or visible-light irradiation. Presently, many methods have been successfully employed for fabrication of bismuth oxyhalides low-dimensional nanomaterials with different morphologies. In order to study their photocatalytic properties of low-dimensional nanomaterials, it is a meaningful work to explore a simply method of preparing bismuth oxyhalides nanomaterial. Electrospinning technology has been extensively investigated as a simple and convenient method for forming inorganic nanomaterials. Hence, it is an important and meaningful subject of study to fabricate bismuth oxyhalides low-dimensional nanomaterials by electrospinning and to investigate their photocatalytic properties.In this thesis, BiOBr, Bi OI and Bi2O3 with nanometer scale were fabricated via the combination of electrospinning process with different calcination heating rate. BiOF, BiOCl,BiOBr and Bi₅O₇ I with nanometer scale were fabricated via electrospinning technique combined with double-crucible method. The samples were characterized by XRD, SEM,EDS, UV-Vis diffuse reflection spectrum（UV-Vis DRS）, and Brunauer-Emmett-Teller（BET）method. Meanwhile, the photocatalytic properties of the samples are studied through the degradation of RhB in an aqueous solution. The results show that BiOBr show the best photocatalytic properties among bismuth oxyhalides fabricated in the same method, and the morphology have an effect on the band gap and photocatalytic properties of the materials. In the end, possible photocatalytic mechanism is also proposed, and some meaningful results are obtained. These new findings lay the solid foundations for the further study of the performance of bismuth oxyhalides low-dimensional nanomaterials.