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Preparation and Photocatalytic Activity of Coupled SnO2-Cu2O Porous Films

Author: XuBin
Tutor: NiuZhenJiang
School: Zhejiang Normal University
Course: Physical and chemical
Keywords: SnO2-Cu2O Three - dimensional porous film Electrodeposition Rhodamine B Photocatalytic
CLC: TB383.2
Type: Master's thesis
Year: 2010
Downloads: 89
Quote: 1
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Abstract


Oxide semiconductor heterogeneous photocatalytic technology in controlling environmental pollution and the use of solar energy has a broad application prospects the the photocatalyst preparation is one of the key topics of the technology. Compound semiconductor having a different energy band structure of semiconductor material, by combining the use of a narrow gap semiconductor sensitized wide band gap semiconductor, but the use of the energy difference between the two semiconductor makes light generated carriers can be made from a semiconductor to another band injection The energy band of the semiconductor, so that the light generated carriers, can prolong the life of the carrier can be effectively separated, improved quantum efficiency. Type 304 stainless steel sheet as the substrate, the cathode hydrogen gas bubbles as a dynamic template, electrical deposition prepared porous Sn-Cu alloy, heated in an air atmosphere under oxidation obtained three-dimensional porous SnO2-Cu2O composite oxide film. By X-ray diffraction (XRD), scanning electron microscopy (SEM), energy separated X-ray spectroscopy (EDS) to characterize the structure, morphology and composition of the alloy and composite oxide film; rhodamine (RhB) as a model reaction system, 125 W fluorescent mercury lamp as a light source, investigated the performance of the porous composite oxide thin film photocatalytic degradation of organic matter of preparation conditions on the surface morphology, structure and photocatalytic properties. The main research content and results are as follows: 1. Electrodeposition parameters (bath composition, current density, temperature, acidity) of the Sn-Cu alloy thin film structure and morphology. The results show that the composition of 0.05 mol / L SnSO4 0.0025 ~ 0.5 mol / L CuSO4, 1.5 mol / L H2SO4, 7.0mL / L formaldehyde and 0.001% polyethylene glycol octylphenyl ether the bath, the current density range 2.5 ~ 6.0 A/cm2, obtained having a three-dimensional porous morphology of the Sn-Cu alloy. Alloy outermost aperture of about 10 to 50 μm, the hole wall from the submicron particles stacked. Coating structure, morphology and composition of the bath concentration and current density. The coating constituted mainly by metallic Sn and Cu, and when the coating of Sn / Cu is 3:1, there are more Cu6Sn5 intermetallic compound is present. 2.Sn-Cu alloy thermal oxidation conditions impact parameters (temperature and time). The results show that the three-dimensional porous alloy film after 200 ℃ 2h and then heated at 400 ℃ 2h oxidized completely into a similar surface morphology and Sn / Cu ratio of metal film SnO2-Cu2O composite oxide films in air atmosphere. The heating temperature is higher than 400 ° C or the time can be greater than 2 h, the presence of the film will have more of CuO. 3 composite oxide photocatalytic degradation the RhB activity. The study results showed that the porous SnO2-Cu2O composite film morphology, composition is an important factor to affect its photocatalytic degradation of RhB activity. Higher activity than that of the porous film of a smooth film. In 0.05 mol / L SnSO4, 0.01 mol / L CuSO4, 1.5 mol / L H2SO4, 7.0 mL / L solution of formaldehyde and 0.001% OP of 6.0 A/cm2 electrical deposition Sn / Cu alloy 3:1, After 200 ℃ 2 h and 400 ℃ 2 h heating oxidation of porous SnO2-Cu2O composite film photocatalytic degradation of RhB better performance than a single SnO2, Cu2O, and the other consisting of porous composite film, and more stable catalytic activity. RhB photodegradation reaction on the composite film is a first order reaction. Its excellent photocatalytic performance can be attributed to both a three-dimensional porous morphology and is more appropriate for the Sn / Cu ratio.

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