Research On Synthesis,Characterization Of BaBiErO₄ And Photocatalytic Degradation Of Nuclear Fast Red

Photocatalytic oxidation technology has become a hot issue in the field of wastewater treatment because of its advantages,such as efficient and energy-saving,no second contamination and so on.Scholars generally agree that photocatalytic oxidation technology has broad prospects in wastewater treatment applications.At present,the research on the catalysts are mainly concentrated in two aspects:on the one hand,TiO2's doping and modification have been becoming one of the interesting research areas,on the other hand,scholars have been always looking for other novel catalyst.Traditional catalysts commonly have high band gap and can not response to the visible light,which has limited the development of traditional catalysts.Thus it is meaningful to find other efficient catalyst for photocatalysis research on the treatment of printing and dyeing wastewater.In this paper,a novel catalyst BaBiErO4 was synthesized by a high temperature solid-state sintering method with BaO,Bi2O3 and Er2O3 as raw materials.The obtained sample was characterized by X-ray diffraction,scan electronmicroscopy,UV-Vis diffuse reflectance spectroscopy,X-ray photoelectron spectroscopy,zeta potential and so on.The results showed that the catalyst BaBiErO4 was crystallized with a cubic crystal system,a space group 225-Fm3m.The particles of BaBiErO4 were irregular,and the prerared BaBiErO4 indicated the existence of Ba,Bi,Er and O,fortunately,other elements were not identified.The band gap of BaBiErO4 was estimated to be about 1.895 eV,indicating that BaBiErO4 could absorb visible light.Herein,we investigated the photocatalytic performances of BaBiErO4 under visible light irradiation with nuclear fast red(NFR)as the target contaminant.The influences of photocatalyst dosages,initial concentration of NFR,light intensity,pH value of reaction system and inorganic salts concentration on the catalyst activity were studied,at the same time,the stability of the catalyst was also researched.The results indicated that BaBiErO4 had an excellent performance in the degradation process of nuclear fast red under visible light irradiation.Inorganic salts of NaCl and NaSO4 mainly had positive and negative effects on the degradation,respectively.The structure of BaBiErO4 was stable and BaBiErO4 could be reused.Besides,compared with N-doped TiO2,the degrading efficiency of nuclear fast red with BaBiErO4 as the catalyst under visible light irradiation was higher.