| With the rapid development of industry, the problem of the water pollution is becoming more and more serious in recent years. Photocatalytic technology not only has the characteristic of high efficiency, but also is a kind of green sewage purification technology without leading to secondary pollution, which attracts the attention of many scholars. This paper prepared a new compound material by choosing nano-sized ZnO which is a kind of semiconductor materials and other materials composited to promote separation of photoproduction electrons and holes, reduce the risk of raw pair composite of ZnO and improve the photocatalytic activity and efficiency of ZnO. Main research contents of the article are as follow:1. Applying the simple low temperature liquid phase method and using cheap AC as the carrier, AC/ZnO composite material is prepared. The results of XRD, SEM and FT-IR characterization analysis show that the morphology of ZnO is very good and its diameter is about500nm, and that it is loaded homogeneously on the surface of AC. Using methylene blue as simulated wastewater treatment object, the nano-sized AC/ZnO composite material prepared endures the tests of photocatalytic performance, the results of which show the degradation rate of methylene blue increases significantly, compared with the pure ZnO or AC. At the same time, this paper explored that the amounts of catalyst has effects on degradation of methylene blue. We found the degradation rate of methylene was increased when the amounts of catalyst changed from30mg to75mg.2. Through solvothermal method, the nano-sized Fe3O4material is prepared under using Fe(NO3)3·9H2O as a kind of raw materials. The results of XRD and SEM characterization analysis show that the contents of nano-sized Fe3O4material prepared are disk and irregular small flake substance and that the size of the disk is homogeneous. Besides, the magnetic test of product characterization results show that the magnetic saturation intensity of Fe3O4is89.52emu/g and superparamagnetic.3. Applying the low temperature liquid phase method, three kinds of nano-sized composite material are synthesized with different proportion of Fe3O4/ZnO. The results of XRD, SEM characterization analysis show that the morphology of ZnO is rod and six prism and that the compound is magnetic at the same time. The comparison of the degradation rate of the methylene blue in the presence of pure ZnO or nano-sized Fe3O4/ZnO composite material is to explore the amounts of catalyst and the concentration of methylene blue have effects on the degradation rate of methylene blue. At last, doing the cyclic degradation experiments, we found that the photocatalytic effect of the composite material declines with a certain degree after three cycles. |
