The Catalytic Prorerties Research Of Nickel-Based Photocatalyst By Plasma-Assisted Preparation

Nikel-based catalysts with the low price and long service life characteristics had been payed more attention in the catalytic degradation field for their special activities. Plasma processing is a new kind of surface modification method, for it has the properties of fast, efficient and non-pollution, and which can change the surface properties of various materials, and mainly used in the preparation of the catalysts. Influence factors were investigated through the preparation of the catalysts, which are as follows: doping ratio of the ion, plasma treatment time and discharge power, roasting time and temperature, dosage of catalyst, raction time and so on.The optimum conditions for the synthesis of NiO/γ-Al₂O₃ photocatalyst were determined as follows: the weight percent of NiO content is 15 %, the time of plasma treatment is 30 min, discharge power is 60 W, clinating 2 h at 500 oC, catalyst dosage is 0.9 g and irradiation time is 50 min, the maximum degradation rate of methyl orange is 79.4 %.The optiumum synthesis conditions of NiO-TiO₂/SiO₂ photocatalyst have been made as below: the molar ratio of Ti/Si is 2:3, plasma treatment time is 30 min, discharge power is 60 W, clinating 3 h at 500 oC and irradiation time is 30 min, the maximum degradation rate of methyl orange is 62.3 %.The synthesis of CuO/TiO₂, NiO/TiO₂ and CuO-NiO/TiO₂ photocatalysts were made by mix TiO₂ with CuO, NiO and used the method of doping modified ions. The optimum conditions for the synthesis of photocatalyst have been made as follows: the best load for CuO is 0.5 %, the best load of NiO and CuO together when the ratio is 0.5 % and 0.1 %, clinating 4 h at 300 oC, the maximum degradation rate of methyl orange is 90.3 %.It is shown that the prepared photocatalysts have well photocatalytic degradation capacity. By using Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), Field emission scanning electron microscopy (FESEM) and other testing methods, the photocatalysts by plasma treatment have been greatly improved in dispersion, stability and photocatalytic activity.