Preparation And Studies On The Properties Of Supported Cu₂O Visible-light Photocatalysis

Semiconductor photocatalysis has become increasingly a promising technology in the wastewater treatment because it is low-cost and completes the hazardous organic compound mineralization. The conflict between immobilization and photoactivity of photocatalyst is one of the main problems restraining the practical application of photocatalytic technology. In this paper, the immobilization methods, the interaction of supports and photocatalyst, photocatalytic degradation property of composite catalysts have been investigated using the novel, large surface area material of different properties as supports in order to make new progresses on the effect of supports and photocatalyst, the practical applications of photocatalytic technology. Some new results have been made.SnO2 is a multifunctional chemical material and when it is fined into manometer. But it is widely used instability, because manometer material has special effect. Thus manometer grain will agglomerate spontaneously and lose its special effect. So it is important to study manometer grain dispersant for its preparation, deposit and application.The Cu2O/ SnO2 compound photocatalyst was prepared by "soak-deoxidize ", taking SnO2 as the carrier, and then characterize the as-synthesized samples by SEM, XRD et al. The results showed that Cu2O/ SnO2 type catalyst with best activity was obtained when the nCu2+: n水合肼:nNaOH was 1:2:2, drying 3h under 600C. The result of photo-catalytic degradation of active brilliant red (X-3B) shows that the decoloring ratio is 94.7%,The photocatalytic properties was better than Cu2O particle(54.4%) under the environment of faintly acid in Cu2O/ SnO2 compound photocatalyst .The pellet of Cu2O/SnO2 was easy to recycle and had high utilization ratio of photochemical catalysis with SnO2 loading, preventing the catalyat lossed.According to the analysis of UV spectrum and Infrared spectrum, Dyes can be digested by the Cu2O/ SnO2 compound photocatalyst and the effect of the catalyst was better.With Cu2O/ SnO2 as photocatalyst, we tested hydroxyl radical in this reaction on the basis of incandescent lamps irradiating and researched its mechanism. The results indicated that it was a heterogeneous hydroxyl oxidation with Cu2O/ SnO2 compound photocatalyst degradating of organic.The photocatalytic oxidation belong to reation and those radicals induced dyes degrade preferably. Multi Wall Carbon Nanotubes support(MWNTs):Multi Wall Carbon Nanotubes (MWNTs) is a novel material accompanied by good electrical conductivity,And has greater surface area, atom-deficiency The nano-Cu2O-MWNTs is prepared by chemical reduction combined with impregnation method using copper acetate as raw material. It shows that there is strong interaction between MWNTs and Cu2O.The result of photo-catalytic degradation of active brilliant black(K-NB) shows that the decoloring ratio is above 90.7%,much higher than pure Cu2O (68.2%)in the condition of neutral conditions and weak acidic conditions.According to the analysis of UV spectrum, Dyes brilliant black(K-NB) can be digested by the Cu2O/ MWNTs compound photocatalyst and the effect of the catalyst was better.The research results prove that the nano- Cu2O can be immobilized on the surface of supports efficiently with structure stability and large surface area material as support. Cu2O has high active of nano-crystal and steady immobilization because of action between Cu2O and support.It is an efficient route for semiconductor photocatalysis degradation becoming industrialization...