Preparation method of TiO2-cladded PbS TiO2/PbS double-layer composite nano tube array of

Abstract

The invention discloses a preparation method of a TiO2-cladded PbS TiO2 / PbS double-layer composite nano tube array. TiO2 acts as a single semiconductor material, defects of high composite rate of photo-generated electrons and electron-hole pairs, low quantum efficiency and the like restrict the catalytic performance to a certain extent, so that TiO2 is relatively low in sewage treatment efficiency. According to the invention, a porous anode oxidized aluminum membrane (AAO) acts as a mold plate, analytic pure Pb(CH3COO)2, Na2S2O3 and TiF4 act as raw materials, and a layer-upon-layer liquid phase assembling technique is adopted, and finally the double-layer composite nano tube array of TiO2 coated PbS can be obtained. The obtained composite nano tube has a double-layer structure, so that the contact area of TiO2 and PbS is increased greatly, and the electron-hole composite probability is reduced, thus facilitating improvement of the photocatalytic performance. A PbS semiconductor is used for modifying TiO2, so that the photoresponse range is widened, and the photocatalytic efficiency is improved. Nano tubes exist in a regular array mode, are easy to recycle from treated sewage so as to prevent secondary pollution. The preparation method has great application significance on the sewage treatment.

Description

Technical field: [0001] The invention relates to a method for preparing an inorganic composite nanotube array, in particular to a TiO 2 TiO coated with PbS 2 / PbS double-layer composite nanotube array preparation method, more specifically, using porous anodic aluminum oxide film as a template to prepare TiO by layer-by-layer assembly technology by liquid deposition 2 Bilayer composite nanotube arrays coated with PbS. The technology belongs to the field of preparation of nanometer materials. Background technique: [0002] In recent years, with the expansion of industry, environmental problems have become increasingly serious. Sewage discharge standards are getting higher and higher, and the high cost of sewage treatment has become a major constraint for the survival and development of enterprises (especially small enterprises). Therefore seek a kind of simple and economical, efficient sewage treatment method has become the social focus issue. [0003] Solar energy is a "...

AI Technical Summary

Problems solved by technology

[0005] (2)TiO 2 As a single semiconductor material, the recombination rate of photogenerated electrons and holes is also high, and its low quantum efficiency limits its use to a certain extent.

[0006] (3) Powdered TiO 2 Easy to agglomerate, affecting the adsorption of target degradation products

About TiO 2 / PbS composite materials are less reported, and the prepared composite materials are mostly dispersed TiO 2 / PbS granular morphology (Stephanie B.Bubenhofer, Christoph M.Schumacher, Fabian M.Koehler, Norman A.Luechinger, Robert N.Grass, and Wendelin J.Stark, J.Phys.Chem.C 2012,116,16264 -16270) or nanotubes, and mostly attached to TiO with PbS particles 2 Tube outer wall mainly (Chalita Ratanatawanate, Chunrong Xiong, and Kenneth J.Balkus, Jr., ACS NANO, 2008, 2(8), 1682–1688; Chalita Ratanatawanate, Amy Chyao, and Kenneth J.Balkus, Jr., Jr. .Am.Chem.Soc.2011,133,3492–3497), it is difficult to recover catalysts in sewage treatment, and it is easy to cause secondary pollution

It is worth mentioning that there is almost no research on TiO 2 TiO coated with PbS 2 Related reports on PbS double-layer composite nanotube arrays

Images