Preparation Of Magnetic GO /TI_O2 Composite Photocatalyst And Photocatalytic Activity Of Dye Waste Water

Textile industry is the most important industry in our country. It can not only bring great benefits to the national economy but also produce large amounts of sewage. Dyeing Wastewater is a kind of industrial wastewater which is very intractable. Dyeing wastewater have lots typical characteristics like large volume, high levels of organic pollutants, alkaline, quantity changes and so on. The main methods are materialization, biological and chemical which are widely used in the treatment of dyeing wastewater now. Sewage disposal system often combines several methods for treatment in practical application. Semiconductor photocatalysis is the hotspot of wastewater degradation for its advantages like superiority mild reaction conditions,clean thoroughly, environmentally friendly and cost-effective. TiO₂ is a kind of semiconductor photocatalysts which is high catalytic efficiency and low prices, so it has great potential in terms of water pollution control. The main purpose in this paper is to improve the traditional TiO₂ photocatalytic properties. GO/TiO₂ composite photocatalyst and Magnetic GO/TiO₂ composite photocatalyst were obtained through a series of reactions After several steps after reaction, the prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, UV- visible diffuse reflectance spectroscopy and other means for exploring the two composite photocatalys’ s physical and chemical properties.（1）Graphite oxide is made from graphite by Hammers method.TiO₂ is made from Tetrabutyl titanate. Different mass ratios GO/ TiO₂ Composite Photocatalyst is made by hydrothermal. The results show that graphene oxide can get by ultrasonic, TiO₂ nanoparticles which is the crystal of TiO₂ can load into graphene oxide surface uniformly; and this photocatalyst have good light absorption ability. So TiO₂ supported on graphene oxide can not only increas the surface area,reduce the size of TiO₂’s particle size, but also can improve the utilization of light. It’s facilitates the reaction proceeds. In this experiment, we study the effects of different GO/TiO₂ photocatalytic materials degradating wastewater model of the brilliant red X-3B solution. This is to determine the optimal conditions, p H and dosage. Studies have shown that the degradation rate of GO/TiO₂ composite photocatalyst catalytic is higher than pure TiO₂.The degradation rate of Reactive Red X-3B is 95.23% after 2h under ultraviolet light. It’s not only because of the graphene oxide high suction force but also thanks to the good conductivity of graphene oxide.So GO/TiO₂ is a photocatalyst of highly value in use.（2）With FeCl₂ and FeCl₃ synthesized magnetic particles--Fe3O4 is made from Fe Cl2 and Fe Cl3 by hydrothermal method. After stirring, standing, drying, calcining, magnetic GO/TiO₂ composite photocatalyst material is made. In order not to affect the catalytic effect, the preparation process requires to strictly control the firing temperature. Because when the temperature rises too quickly the gel particles will crack and formation holes. The results show that the magnetic GO/TiO₂ has no fixed shape, and Fe3O4 and TiO₂ are uniformly supported the surface of graphene oxide. Photocatalytic materials has a good light absorption capability with redshift of the absorption spectrum.Macroscopic magnetic shows that magnetic GO/TiO₂ has strong magnetic in magnetic field. In this experiment,we study the effects of different mass of GO and Fe3O4 in magnetic GO/TiO₂ photocatalytic materials degradating wastewater model of the brilliant red X-3B solution.This is to determine the optimal conditions,p H and dosage.The results show that when graphene oxide content of 8%, Fe3O4 content of 8%, the degradation rate of Reactive Red X-3B is 97.93% after 2h under ultraviolet light.（3）Pure TiO₂, graphite oxide, Fe-₃O₄, GO/TiO₂ and magnetic GO/TiO₂ photocatalytic material degradae reactive red X-3Bsolution to compare their ability to decompose.After 2h the effect of photocatalyst is most obvious,the degradation rate of magnetic GO/TiO₂ is 12% more than pure TiO₂’s.And the degradation rate of magnetic material increase 15% than common materia after these material are recycled several times.This proves that the magnetic particles and the carrier have great effect to increase the photodegradation rate of TiO₂.（4）The reaction of GO/TiO₂ and magnetic GO/TiO₂ photocatalytic degradation of Red X-3B solution consistent with one-order reaction. The In（C0/C） and reaction time have a good linear relationship. R2 which is all in this reaction is greater than 0.94. In addition, The reaction rate constant（K） of magnetic GO/TiO₂ photocatalytic material was higher than undoped GO/TiO₂.These results show that magnetic composite photocatalytic material can solve the limitation of TiO₂ photocatalytic applications, can offer the best data for photocatalytic degradation dyeing wastewater,can offer new ideas for recycling photocatalyst and widespread implementation.