Preparation, Modification And Photocatalytic Activity Of BiOCOOH Photocatalyst

In this thesis, bismuth oxide formate semiconductor photocatalyst were prepared via a simple solvothermal method. The as-prepared bismuth oxide formate materials were modified by compositing with Bi OI, Ag₃PO₄ and Ag Br respectively. It can get the composite materials with improved photocatalytic performance. The properties of these materials were characterized by XRD, SEM, EDS, TEM, XPS, IR, UV-Vis DRS and BET. Then the photocatalytic degradation performance and mechanism of organic dyes pollutants such as Rhodamine B?Rh B?, methyllene blue?MB? and methyl orange?MO? were investigated. The main contents can be divided into three parts as followings:1. Bi OCOOH semiconductor photocatalyst were prepared by using Bi?NO₃?3·5H₂O and DMF as raw materials. The different ratios of Bi OI/Bi OCOOH composites were prepared via a simple solvothermal method by controlling the molar ratio of I/COOH. The phase structure, morphology, specific surface area and ultraviolet-visible absorption properties of as-prepared composites were determined by using XRD, SEM, BET and UV-Vis DRS methods. The photocatalytic activities were researched by degradation of Rh B and MO with different conditions under visible light, then the best proportion can be found out. Radical scavenger experiments were applied to investigate the possible degradation mechanisms.2. A series of Ag₃PO₄/Bi OCOOH composite photocatalysts with different molar ratio were successfully synthesized by in-situ ion precipitation method. The phases, compositions and microstructures of the composite photocatalysts were characterized. The samples exhibited excellent photocatalytic activities for degradation of Rh B and MB under visble light, and the main active species in the degradation process were also analyzed by radical scavenger experiments to investigate the possible degradation mechanism.3. A flower-like Ag Br-Bi OCOOH composites were successfully synthesized by two-step solvothermal method. The phases, compositions and microstructures of the composite photocatalysts were characterized. The photocatalytic activities of the composites were evaluated by degradation of Rh B and MB as a simulated reaction.