Microstructure Modulation And Photocatalytic Activity Of BiOCl Nanomaterials

With the development of society and technology,energy shortages and environmental pollution have become the focus of attention of the word.As one of the most promising solutions for these issues,semiconductor photocatalytic technology has recently drawn much attention.Bismuth oxychloride（Bi OCl）nanomaterial as an important class of functional material has been widely used in photocatalysis research due to its unique electronic,optical and photocatalytic properties.It can be found that BiOCl nanomaterial is a kind of ideal and promising photocatalytic materials.Herein,we focused on the design and synthesis microstructure modulation of BiOCl nanomaterial and well application in photocatalysis.This dissertation are mainly divided into the following three aspects:（1）Uniform 3 D microspherical BiOCl architectures assembled by nanosheets with tunable thickness were successfully synthesized via a simple solvothermal route.The morphology and structure of the BiOCl could be controlled by adjusting the pH values.We had carefully discussed the influence of reaction condition,especially the pH values.The influence of different pH value on the performance of BiOCl hierarchical microsphere was studied systematically.The photocatalytic activity of the samples was evaluated under visible light and UV light irradiation,respectively.The detailed generation and transfer of photogenerated carriers in the indirect dye photosensitization pathways and the direct semiconductor photoexcitation pathways were also made a comparison.（2）Er³⁺doped Bi OCl hierarchical microspheres were synthesized by a facile solvothermal method.XRD,SEM,TEM,XPS,UV-vis and DRS were performed to investigate the structural and optical properties of the as-prepared samples.The presence of Er³⁺did not affect the structure and morphology of the BiOCl.The Er³⁺doped BiOCl microspheres exhibited an enhanced photocatalytic activity for the degradation of rhodamine B under visible light irradiation.The sample with 1.0 mol %Er³⁺dosage showed the best photocatalytic performance.The enhanced activity was attributed to the dopant which could transform visible light into ultraviolet light.（3）We have demonstrated for the first time the fabrication of mesoporous BiOCl hexagonal prisms（BiOCl HPs）by a simple solvothermal route.The surface and internal structures of the mesoporous BiOCl HPs are fully characterized by electron microscopy techniques.We have been studied in detail to address the possible formation mechanism of porous BiOCl HPs.These novel BiOCl HPs exhibit high activity and selectivity toward the photocatalytic aerobic oxidation of benzyl alcohol to benzaldehyde and degradation of methyl orange（MO）.