Study On The Synthesis Of New Type Catalyzer And The Photocatalytic Degradation Of Effluent Dyestuff

Perovskite oxides ( ABO₃ ) has stable structure and high photocatalytic activity ,further more a catalyst which has more narrow band gap can be synthesized and can absorb more solar energy by altering the type of A and B. A series of perovskite oxides are synthesized by means of blend deposition using the nitrate of A and B as the raw materials, and ammonia or sodium carbonate as sedimentation .A includes alkaline-earth metals such as Mg, Ca, Sr, Ba and rare-earth metals La; while B includes transition metal Cr, Mn, Fe, Co and Ni. The result of activity evaluation indicates that the effect of A is low while the effect of B is remarkable comparatively. The normal tendency of change is that the photocatalytic activity improvements with the increases of atomic number.The activity of CaNiO₃ is the highest among the above photocatalysts. The test result of XRD and TEM shows that the purity of CaNiO₃ is comparatively high and the particle shape is approximately round ball whose diameter is in the range of 150 200nm. The photocatalytic activity of CaNiO₃ and TO₂ is compared, and the result shows that the activity of the two photocatalysts are equal under the irradiation of UV while under imitation of sunlight the farmer's activity is higher than the latter's, and that the rate of degradation of acid red B is 63% and 47% respectively. The compound oxides of CaFe_xNi_1-xO₃ (x=0.1-0.9) have been synthesized. Among them, the activity of CaFeo.3Nio.7O3 is the highest and under the imitation of sunlight, the rare of degradation...