Preparation of TiO₂/C/Fe₃O₄ Magnetic Composite Catalyst and Research of its Photocatalytic Performance

TiO₂/C/Fe₃O₄ magnetic composite catalyst was prepared by using glucose as carbon source to attach an intermediate isolation layer and then wrapping TiO₂ directly on Fe₃O₄ magnetic support. The catalytic performance of the catalyst was studied by photodegradating RhB simulated wastewater under the changed external conditions such as light resource, temperature, pH and ion intensity of the solution. It was found that the photocatalytic performance under uv light was better than that of the catalyst under the visible light. The photocatalytic performance increased with the increase of temperature and acidity of the wastewater, and the decrease of the ion intensity of the wastewater. The optimum photocatalytic reaction condition was under uv light, the temperature was 75°C, pH was 1 and ion intensity was 1mmol/L. The magnetic effect was applied to the reutilization of the catalyst, and the fourth recycled catalyst still had catalytic activity, but with the increase of reusing time, the photocatalytic performance of the catalyst decreased gradually. The photodegradation rate of the recycled catalyst 90 min later was reduced from 76.20% to 57.08%, 41.80%, 28.44%, respectively, while 4 times of repeated use under uv light, 25°C, pH 1, and ion intensity 1 mmol/L. (paper)