Photocatalytic Decomposition Of H₂O₂ By BiVO₄ For The Inactivation Of Marine Bacteria

The discharge of ballast water has received great attention and has a certain impact on the economy and the ecological environment,so we need to develop an environmentally friendly technology to solve the problem.The holes produced by photocatalytic technology react with OH^-to produce·OH,while H₂O₂ can capture electrons to produce·OH.In this thesis,Bi VO₄ is improved by applying the method of constructing heterojunction and metal element deposition,and Bi VO₄is added to the fluorocarbon resin to enhance the antifouling performance.Summarized as follows:1、The SPR effect can enhance the charge separation efficiency of the photocatalyst,so Bi/Bi VO₄ powder was prepared by using ethylene glycol as the solvent.The H₂O₂ decomposition and sterilization performance tests were carried out under visible light conditions.The experimental results showed that compared with pure Bi VO₄,the decomposition efficiency for H₂O₂ and sterilization rate of Bi/Bi VO₄samples were significantly improved.EIS and photocurrent tests showed that the SPR effect caused by metallic Bi nanoparticles accelerated the separation efficiency of carriers,thereby improving the decomposition rate of H₂O₂ and photocatalytic performance.2、The traditional type II heterojunction can effectively inhibit the recombination of carriers.Therefore,the semiconductor compound technology is used to recombine Bi OIO₃ with a wide band gap and Bi VO₄ with a narrow band gap to construct a heterojunction.The H₂O₂ decomposition and sterilization performance tests were carried out under simulated sunlight conditions.The experimental results showed that compared with pure Bi VO₄ and pure Bi OIO₃,the decomposition efficiency for H₂O₂and sterilization rate of Bi VO₄/Bi OIO₃ samples had been significantly improved.TEM test showed that Bi OIO₃ and Bi VO₄ were combined to form a heterojunction.EIS and photocurrent tests showed that the heterojunction could effectively improve the separation efficiency of carriers,thereby achieving the improvement of photocatalytic performance.3、The Z system mechanism can effectively accelerate the separation efficiency of charges.Ag/Ag VO₃/Bi VO₄ composites were prepared by using ion exchange and reduction methods.The H₂O₂ decomposition and sterilization performance of the material were tested under visible light conditions.The experimental results showed that compared with pure Bi VO₄,the decomposition efficiency for H₂O₂ and sterilization rate of the composite sample were significantly improved.EIS and photocurrent tests showed that the Z system mechanism could effectively separate electron-hole pairs,which is conducive to the improvement of the photocatalytic performance of the material.