Study Of Design, Preparation And Organic Pollutant Degradation Performances Of Visible-light Reponse Nanocomposite Photocatalytic Materials With Magnetic/Optical Function

Photocatalytic technology is a kind of high efficient green oxidationtechnology, has a wide research and application in the field of environmental pollutioncontrol and energy development.Now preparation and properties of the visible lightresponse photocatalytic materials is one of the most active research topics. But after30years of extensive research, the photocatalytic technology is still not widely used inwastewater treatment, mainly due to the traditional powder photocatalyst afterphotocatalytic degradation reaction, it is difficult to separate from the reaction mixture,resulting in lower recovery. Not only a large number of photocatalytic materials will belossed, but also cause secondary pollution.Therefore, the key to realize the industrializationapplied of photocatalytic technology is to improve the utilization rate of solar energyutilization ratio and catalyst circulation ratio.This paper will start from the two big ideas,late the visible light catalyst combining with magnetic materials, design, preparation of anew type of the magnetically separable and visible light responsed pholocatalyst.The main contents are summarized as follows:1. Excellent performance and easy recovery Bi2O3/Fe3O4magnetic nanocompositewere successfully synthesized by a facile solvothermal process,employing Fe3O4，Bi(NO3)3·5H2O as starting materials, ethylene glycol(C2H6O2) as the solvent. The productswere characterized by XRD. The results show that with the increase of the reactiontemperature,reaction time and the increase of Bi3+concentration,crystallization of Bi2O3allhave a degree of enhancement. In addition, the photocatalytic experiment show that thecomposite material has a good degradation effect on RhB under visible light irradiation, Inthe light of60min the degradation of RhB at a rate of83.6%.2. Bi2O3/Fe3O4magnetic nanocomposite photocatalysts are prepared by method ofsol-precipitation process. When Bi(OH)3sol has been prepared, Fe3O4nanoparticles areadded into it as nucleating agent, Bi(OH)3sol particles deposite onto the surface of Fe3O4nanoparticles and gelate under basic condition, followed by dehydration and crystallization using heating reflux method. Then after magnetic separating, washing and drying,Bi2O3/Fe3O4magnetic nanocomposite photocatalysts are prepared. Its morphology andstructure were characterized by SEM and XRD. The results showed that the Bi2O3wasevenly coated on the nano Fe3O4particles in as-prepared Bi2O3/Fe3O4sample. Thephotocatalytic experiment results showed that Bi2O3/Fe3O4magnetic nanocompositephotocatalyst had good visible light photocatalytic activity.3. Using CuCl, Na2S·9H2O and nano Fe3O4as raw materials, the nanoparticle Cu2Sand Cu2S/Fe3O4magnetic nanocomposite was successfully prepared at a lower temperaturesolid state reaction. To explore the effects of reaction conditions on the formation of theproduct by changing the molar ratio of the reactants and the ball milling time. The particlesize and microstructure were characterized by TEM and XRD techniques. Thephotocatalytic experiment results showed that Cu2S/Fe3O4magnetic nanocomposite had agood photocatalytic activity.4. First using Fe3O4and glucose as the raw materials synthesis Fe3O4@C complex,then under the condition of the ethylene glycol as solvent and reducing agent, theFe3O4@C complex as the carrier, add CuCl2.2H2O to it by a facile solvothermal process,we successfully synthesize the Fe3O4@C@Cu2O nanocomposite. The degree ofcrystallinity and microstructure of the products were characterized by the means of XRDand TEM techniques. We also to explore the effects of different reaction temperature,reaction time, Fe3O4@C and dosage of solvent on preparation of Fe3O4@C@Cu2Onanocomposite system.