| Dye wastewater is one of industrial wastewater which is difficult to bedegraded. In it, methylic orange is more difficult to removed. Photocatalysis byTiO2 are very promising methods to degrade dye wastewater for cheaper, highactivity, no secondary pollution.At present, the research about TiO2 form has two tendency: one is TiO2powder, another is TiO2 membrane. Compare with TiO2 membrane, TiO2 powderhas the larger surface. Therefore, its photocatalytic activity is higher. But TiO2powder is not perfect for so small particle diameter. It is difficult to be separatedfrom reactants. Especially in the system of industrial wastewater, it has big lostrate when to be separated. For increasing photocatalytic activity with little lostrate, we prepared nanometer magnetic photocatalytic compound as followedmethods.At first, we prepared the Fe3O4 magnetic fluids in ethanol withcoprecipitation method, and dispersed by ultrasonic and then preparednanometer/nanometer magnetic photocatalytic compound by sol-gel technique .The modification research of the photocatalytic compound was processed bycombining semiconductor. The results indicated that the combing semiconductorformed the transfer place for electron , decreased the composition ofelectron-cavity, then enhanced the photocatalytic properties of thephotocatalytic compound. As comparison, we prepared nanometer/micrometermagnetic photocatalytic compound. The results showed that it had higherphotocatalytic activity than the nanometer/namometer magnetic photocatalyticcompound for its perfect crystal type and surface core-shell structure , etc.Finally, the experiment of photocatalytic degradation of methylic orangesolution as dye wastewater was conducted. Subsequently, the concentration ofmethylic orange, the amount of catalyst, illumination intensity, pH and otherconditions on degradation process was studied and the optimal conditions werefound.
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