Synthesis And Visible-light Photocatalytic Performance Of Bismuth Materials

In recent decades,the industrialization level of the world has developed rapidly.With enjoying the convenience of economic development,People have to withstand the problems which caused by environmental pollution.Water pollution and air pollution have directly threatened people's daily life and even harmed people's health.With the huge amount of sewage treatment fee,in order to reduce manufacturing cost,many factories discharges polluted-water to the river without any treatment,the polluted water will threaten the survival of fishes and algae,as you know,eating poisonous substances would cause life-threatening damage.The treatment of dye wastewater and toxic wastewater has drawn widespread interest among researchers.Photocatalysis technology stands out rapidly with its unique advantages,under the solar light illumination,catalysts will decompose organic molecules into inorganic small molecules.People are committed to finding a series of semiconductor catalyst which possess a low cost,simple synthesis method,environmentally friendly technologies,etc.Elemental Bi can convert semi-metals into semiconductors to degrade contaminants under a certain conditions.The structure of BiOX?X=Cl,Br,I?consists of two halogen atoms embedded in the[Bi₂O₂]²⁺substrate,which is conducive to the separation of the photo-generated h⁺and the electron?e^-?and the transfer of the electrons,so that it has good catalytic performance.The research contents of this paper are as follows:?1?PS microspheres was used as a template,and bismuth nitrate pentahydrate as bismuth source,the generated bismuth oxide was coated evenly over PS microspheres,bismuth with round holes was successfully synthesized by calcination.The as-prepared bismuth was characterized by X-ray diffraction,field emission scanning electron microscopy,high-resolution transmission electron microscopy,and specific surface area measurement,etc.When the calcination temperature is 700oC,the as-received sample possess uniform pore.Under visible-light irradiation,In order to explore the photocatalytic activity of the sample,the as-prepared sample was used to degrade acidic rhodamine B solution.Finally,the possible mechanism of sample to degrade the dye is discussed.?2?The BiOI sample was successfully synthesized by one-step solvothermal method.The morphology and size of the sample were controlled by changing the ratio of the reactants.In order to explore the optimal ratio,the prepared samples were characterized by precision instruments.The formation mechanism of 3-D hierarchical microspheres was discussed in the paper.The catalytic performance of sample was discussed by decomposing methylene blue and phenol under visible light.The active group which actives groups play an important role in the degradation process was studied,and then the cycle stability of the sample was explored.?3?The flower-like BiOI was synthesized by a simple solvothermal method,and the as-prepared BiOI was used as precursor,the BiOI sample was modified with different concentrations of silver nitrate.Under visible light irradiation,we discuss the effect of the amount of modification on catalytic,it reveals that3%-Ag/BiOI has the best degradation ability among the samples.When 3%-Ag/BiOI was used to degrade MB and phenol,the degradation efficiency was also efficient,and possible mechanism of Ag/BiOI degradation was explored.