| With the rapid development of modern industry, a large number of organic reagentsused in the industrial production procedure and by-products after reaction that cause allkinds of pollution in everyday life.Among them, the most serious water pollution iscaused by the printing and dyeing industries.Due to the organic dye in this field has thecharacteristics of biological toxicity, strong oxidation resistance, complex components,difficult for biodegradation, it not only brings great trouble to the treatment of industrialwaste, but also results inthe serious pollution to the environment and has caused seriousharm to human health.So on how to effectively degradethe organic waste water hasbecome a major problem that facedby the global researchers.Traditional method ofsewage treatment has shortcomings like high cost, nosufficient degradation, easy for causing the secondary pollution. The activation energyof photo-catalytic oxidation technology comes from photon energy, which can oxidizeorganic substancescompletely into CO2and H2O, so it has been favored by more andmore scientist. So far, the studied photo-catalysts including TiO2、CdS、Fe2O3、WO3、ZnO、ZnSand SnO2. Among which, CdS and TiO2are with the strongest catalyticactivity. However, CdS itself is unstable under light irradiation and easy for chemicalorphotochemicalcorrosion, so little research has put on it. On the contrary, titaniumdioxide, because of its advantages like good stability, high catalytic activity,low energyconsumption,reusable and so on, it has been considered as the ideal photocatalyticmaterialin managing the environment pollution. However, TiO2also has unsatisfactorypoint, which can only absorb ultraviolet light, resulting the low usage of solar energy.Therefore, how to modify TiO2for improving the visible light use are of importantsignificance to realize the photocatalytic degradation of water pollution.Fullerene has the advantages of low cost, high specific surface area, good stabilityand excellent electronic transport propertiesand it has been widely used asthe carrier ofcatalyst. As a result, we can apply it as a carrier ofTiO2to make the C60/TiO2compositethat reduce the recombination of electrons and holes in TiO2, which in turn improve thecatalytic reaction rate.In our study, PHF/TiO2nanocomposites were synthesized by hydrothermal methodand UV assisted method. And both the preparation process and catalytic activity werecompared by us. Firstly, we oxidizedC60into PHF before synthesizing the nanocomposites and some physical and chemical parameters of synthesized C60havebeen characterized. Afterwards, Physicochemical properties of thePHF/TiO2nanocomposites are characterized in detail by transmission electronmicroscopy, X-ray diffraction, Fourier transform infrared spectroscopy,thermogravimetry, UV visible diffuse reflectance spectroscopy and electrochemicalimpedance spectroscopy. We focus on introducing and discussing the UV assistedmethod, it is found that the diameter of the PHF/TiO2nanocomposites were around30-40nm and strong chemical bonding Ti-O-C exists between PHF and TiO2. Inaddition, the influences of solvent and irradiation time in the procedure of UV assistedmethod were discussed.At last, the photocatalytic performance on degradingRhodamine B under the visible light were tested to compare the two methods. Theresults show that the photocatalytic abilityon degrading Rhodamine B by hydrothermalmethod and UV assisted method were85%and88.9%, respectively, which was farmore than pure TiO2.Nevertheless, hydrothermal method was complicated in operating,need for high temperature and high pressure, more by-products that difficult for purify.So itis not suitable for industrial application. In comparison, UV assisted method aresuperiority, which is easy for operation under mild reaction conditions and need shortreaction time. In consequences, the UV assisted method is obviously superior to thehydrothermal method, which provides a new path for potential industrial applications ofPHF/TiO2composited nanoparticles. |
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