| Photocatalytic technology was a new environmental-friendly technology which has been showed a vast and tempting prospect in the field of environmental protection and management. Photocatalytic technology was mainly applied in air purification, wastewater treatment and reuse. TiO2semiconductor was a kind of typical photocatalyst which has good chemical stability, high photocatalytic activity, non-toxicity, low cost and so on. However, nano-TiO2photocatalyst have some drawbacks such as easy-loss, difficult-recycling in the process of practical application. Therefore, the preparation of loading TiO2on supported-materials has great practical application. This type of method not only can solve problem of catalyst powder is easy to reunion and the shortcomings of catalyst is difficult to recycle, but also can use the active component and functional structure of carrier to design the catalytic reactor.In this paper, the nickel foam has been chose as the carrier of TiO2-photocatalyst, meanwhile foam copper, aluminum foil and titanium mesh also has been chose for comparative research. The load technique mainly includes anodic oxidation-impregnation, chemical plating and electroplating. The main research contents are as follows:First, the photocatalytic materials were prepared by anodic oxidation impregnation method. The optimal condition as follows:the current density of the first step:1A/dm2, oxidation time:5min, the current density of the second step:1A/dm2, oxidation time:1min. P25suspension was most suitable for the impregnation liquid on foam nickel and foam copper. When TiO2sol-gel was immersed in fluid the prepared photocatalysts have good photocatalytic activity, but it is only suitable to titanium mesh and titanium/aluminum foil with singtering of high-temperature.TiO2/titanium mesh (UVIX-TMiP), TiO2/Ti/CF, TiO2/Ti/NF, all the three kinds of photocatalytic materials have good photocatalytic oxidizability to acetaldehyde gas, the first order kinetics rate constant of K was17.94,28.57and34.41, respectively. Photocatalytic materials of TiO2/Ti/NF, TiO2/Ti/CF, TiO2/Ti/Al and Ni-TiO2/NF have a selective for photocatalytic degradation of active black, acid fuchsin, methylene blue and Congo red. The best materials for photocatalytic degradation of active black, acid fuchsin, methylene blue and Congo red were TiO2/Ti/NF, TiO2/Ti/Al, TiO2/Ti/NF and TiO2/Ti/CF, respectively. TiO2/Ti/NF was the best one on degradation of phenol in four types of photocatalytic material mentioned aboved, the degradation rate can reached to46%after six hours. TiO2/Ti/NF photocatalytic materials has a very good photocatalytic inhibition for algae, and will not only kill algae, also can decompose algae cell. Photocatalytic materials of TiO2Ti/NF has a inactivated effect on E.coli, the inactivated rate can reach more than99.99%after two minutes.Second, for photocatalytic materials that was prepared by chemical plating and electroplating, the studies of the process of composite electroless of Ni-P-TiO2and electroplating Ni-TiO2. where the results show that on the PE plastic process the photocatalyst has good photocatalytic activity of the degradation of reactive black.Third, deactivation and regeneration of photocatalytic materials. The uneven illumination intensity can result in a oxidized mixture of graphite and nickel brittle material and failure which was found by structure and composition analysis of Ni-TiO2/mandruka. The failpoint and the non-failpoint for the degradation of reactive red rate was37.7%and56.7%, respectively. The results showed technology of ultrasonic cleaning fluid has the very good reproductive function, and titanium dioxide also won’t fall off by the structure and composition analysis of regeneration before and after Ni-TiO2/nickel foam. Photocatalytic performance of regeneration materials reached to96%of the new material. |
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