Synthesis And Photocatalytic Activity Evaluation Of PbBiO₂I Based Materials

With urbanization and industrialization increasing,the contamination caused by organic molecule pollutants,biological substances,polymer pollutants and gases is becoming a severe problem.For the sustainable development of human society,it is an urgent task to develop pollution-free technologies for environmental remediation.Photocatalysis process provides an easy way to utilize solar radiation which is abundant in nature and they can chemically transform pollutants into non-hazardous compounds without secondary pollution.Semiconductor photocatalysis is one of the most active areas of research and application for nearly two decades.However,the traditional semiconductor photocatalyst has limited in wide application because of its low utilization rate of solar energy and low separation efficiency of photogenerated carriers.Therefore,the development of high-performance photocatalysts has attracted a great deal of attention.In this paper,a novel PbBiO₂ I photocatalytic material was synthesized with reactive ionic liquids.We controlled the light absorption range and photocatalytic activity of the PbBiO₂ I photocatalyst by the methods of modification of g-CN and MoS₂.The morphologie,composition and effect of carbon nitride and molybdenum disulfide on the properties of the composites were investigated by some characterization methods.Combining with various characterization results,the related photocatalytic mechanism was explored.The specific research contents are as follows:1.Novel visible-light-driven PbBiO₂ I materials have been successfully synthesized by a one-pot ethylene glycol assisted solvothermal process in the presence of 1-hexyl-3-methylimidazolium iodide?[Hmim]I?.The morphologies,compositions and properties of the PbBiO₂ I materials were investigated by X-ray diffraction?XRD?,X-ray photoelectron spectroscopy?XPS?,Scanning electron microscope?SEM?,Transmission electron microscope?TEM?,Diffuse reflectance spectroscopy?DRS?and nitrogen adsorption-desorption isotherms etc.The photocatalytic performance of the prepared PbBiO₂ I materials was determined by colorless antibiotic CIP.The results show that the prepared PbBiO₂ I samples are microspheres with a diameter of about 1.5 ?m assembled by nanosheets.PbBiO₂ I material has a good visible light response with a bandgap of 1.96 eV.Photocatalytic degradation experiments show that PbBiO₂ I has a good visible photocatalytic activity.Under the visible light irradiation for 6 h,about 46% of the CIP could be removed byPbBiO₂ I microspheres.2.MoS₂/PbBiO₂ I composite with differnt MoS₂ contents have been synthesized by a solvothermal method using ethylene glycol as solvent in the case of [HMIm]I.The prepared samples were characterized by XRD,XPS,SEM,TEM,EDS and Photocurrent etc.The XPS and EDS analysis showed that MoS₂ is successfully compounded in PbBiO₂ I material,MoS₂/PbBi O₂ I samples are microspheres assembled by nanosheets.The photocatalytic activity of MoS₂/PbBiO₂ I composites was higher than that of pure PbBiO₂ I and the 1 wt% MoS₂/PbBiO₂ I composites have the best photocatalytic property.Compared to pure PbBi O₂ I,the photocurrent result showed that the MoS₂/PbBiO₂ I composites have higher separation efficiency of photo-generated electrons and holes and enhanced the photocatalytic activity.3.g-CN/PbBiO₂ I composite with differnt g-CN contents have been synthesized by a solvothermal method using ethylene glycol as solvent in the case of [HMIm]I.The prepared samples were characterized by XRD,SEM,TEM,EDS,PL and Photocurrent etc.The TEM and EDS analysis showed that g-CN is successfully compounded in PbBiO₂ I material,g-CN/PbBiO₂ I samples are microspheres with a diameter of about 1.5 ?m assembled by nanosheets.The photocatalytic activity of g-CN/PbBiO₂ I composites was higher than that of pure PbBiO₂ I and the 0.5 wt%g-CN/PbBiO₂ I composites have the best photocatalytic property.Compared to pure PbBiO₂ I,the PL result showed that the g-CN/PbBiO₂ I composites have lower recombination rate of photo-generated electrons and holes and enhanced the photocatalytic activity.