Study On Suspension Photocatalytic Reactor Based On Adsorption - Photocatalytic System

Photocatalysis is effective for the conversion of environmental-friendly solar energy into chemical and electrical energy, solving the global problems of energy crisis and serious environment pollution to realize the substantial development of society. Although various photocatalysts have been developed for the treatment of dyeing wastewater, research works are still mainly focused on the preparation of the. Developing the approaches of photocatalyst immobilization and designing the efficient photocatalytic reactors are the key aims to realize the large-scale application of photocatalytic technology, inhibiting the disadvantages of powder photocatalysts including the difficulty of separation and the inconvenience of reuse. In this paper, coated with various photocatalytic films via sol-gel route were utilized in glass-ball-floated photocatalytic reactor for the treatment of dyeing wastewater. The thickness of photocatalytic films on the hollow glass balls was uniform and highly active. The hollow glass balls were rotated uniformly with the bubbling processes in the base of the solution and thus the induced the uniform liquid membrane of dyeing wastewater on the surface of hollow glass balls to absorb the irradiation light efficiently, inhibiting the shield effect of dyeing wastewater. The preparation method in this paper was simple and the glass-ball-floated photocatalytic reactor was efficient for the light utilization, expanding the field of photocatalytic reactor design. Based on the optimization of photocatalytic reactor parameters, this paper mainly tried to solve the problems of Ti O2 photocatalytic film including the limited light adsorption only for UV light and the poor adsorption of reactant, as following sections.（1） Bi₂O₃/TiO₂@SiO₂ microsphere visible catalyst immobilization film applied to the suspended photocatalytic reactor for the removal of MOTo use Sol-gel method, coating Bi₂O₃ / TiO₂ @ SiO₂ on the glass balls Glass balls surface, optimizing the best Bi / Ti = 1.0 mol%, Ti / Si = 0.5 mol%. In the experiment, by means of a silicon oxide microspheres structure, to achieve IV accelerate adsorption-photocatalysis synergy under visible light. In sight of the reactor, we successfully constructed suspended photocatalytic reactor based on the literature reference design and the engineering design principles. The result is improving the dye wastewater treatment capacity by optimizing the process parameters of the reactor. Correspondingly, the issue also need for improvement in many areas, such as the limited absorption capacity of the micro-pollutants spherical silica. So it need to replace some of the adsorption material, such as Al₂O₃, mesoporous SiO₂, Zr O₂, and mesoporous ceramic carrier. The combination of adsorption-photocatalysis synergy and photocatalytic reactor system, which provide a theoretical basis for practical application in the future.（2） AgCl/BiOCl@mesoporous SiO₂ Photocatalytic film applied to the suspended photocatalytic reactor with enhanced adsorptionIn order to develop the non-TiO₂ photocatalytic film, the Ag Cl/Bi OCl film was prepared via liquid-deposition method assisted with P123 surfactant. Based on the characterizations of FESEM, XRD, and UV-vis DRS, it could be found that the surface of Ag Cl/Bi OCl film was uniform. The in-situ doped Ag nanoparticles improved the utilization of visible light via the plasma resonance effect. Ag Cl/Bi OCl photocatalytic film applied in glass-ball-floated photocatalytic reactor was active for the degradation of Rhodamine B, methyl orange and 4-chlorophenol. Additionally, the Ag Cl/Bi OCl film was stable for the recycling test.Adsorption of mesoporous materials have not really play a role in the degradation, only transfer pollutants from one phase to another phase,. Photocatalytic oxidation can make it completely mineralized, and no secondary pollution, the main principle is semiconductor produce electron-hole pairs under ultraviolet irradiation.They will react with the different groups in the semiconductor surface. And finally to make the degradation of organic pollutants.（3） Photocatalytic catalyst implanted in high curvature glass ball pplied to the suspended photocatalytic reactor The loading catalyst of the nanofilms in suspended photocatalytic reactor, stability and repeatability in the process of photocatalytic thin film coating process is the problem.Some catalysts in the light irradiation, it will be light corrosion, photolysis phenomenon, making limited use of the catalyst. Herin we can be solved relatively light portion of the catalyst instability problem, the catalyst was implanted into the raw material in the glass sphere. In high curvature glass balls surface, a supported catalyst is more complex, using such implants catalyst, blow molding process can solve the high carrier-supported catalyst surfaces problem. The variety of monochrome film membrane material, technology processing is simple,and high practical values is much.