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Method for eliminating nano porous layer on surface of titanium dioxide nano tube array

A nanotube array and nanoporous technology, applied in titanium dioxide, titanium oxide/hydroxide, nanotechnology, etc., can solve problems such as operational obstacles

Inactive Publication Date: 2013-09-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The porous layer covers the surface of the nanotube array, making the orifice of the nanotubes that make up the array smaller, and hindering the operation of assembling other nanomaterials such as nanodots, nanowires, and nanorods in the nanotubes.

Method used

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  • Method for eliminating nano porous layer on surface of titanium dioxide nano tube array
  • Method for eliminating nano porous layer on surface of titanium dioxide nano tube array
  • Method for eliminating nano porous layer on surface of titanium dioxide nano tube array

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specific Embodiment approach 1

[0027] Specific embodiment one: the method for removing the nanoporous layer on the surface of a titanium dioxide nanotube array according to the present embodiment is carried out in the following steps:

[0028] 1. Preparation of impregnation solution: Weigh deionized water, hydrofluoric acid with a mass concentration of 40% and nitric acid with a mass concentration of 65% to 68% and mix them evenly to obtain an impregnation solution; wherein the hydrofluoric acid with a mass concentration of 40% The volume ratio with deionized water is (0.2~1): 100, and the volume ratio of the hydrofluoric acid with the mass concentration of 40% to the nitric acid with the mass concentration of 65%~68% is 1: (4~5);

[0029] 2. Remove the film: immerse the titanium dioxide nanotube array covered with nanoporous layer in the immersion solution prepared in step 1, take it out after immersion for 2 to 20 minutes, and rinse it with deionized water. The nanoporous layer covered on the surface of th...

specific Embodiment approach 2

[0030] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the preparation method of the titanium dioxide nanotube array that the surface covers the nanoporous layer in the step 2 is carried out according to the following steps:

[0031] a. Pretreat the surface of a pure titanium plate with a purity ≥ 99.9%; b. Use deionized water, ammonium fluoride, and ethylene glycol to prepare an electrolyte, wherein ethylene glycol is a solvent, and the mass concentration of ammonium fluoride is 0.2 %~0.3%, the volume concentration of deionized water is 1.0%~5.0%; c, in the electrolytic solution prepared in step b, the pure titanium plate processed with step a is used as the anode, graphite is the cathode, and the voltage is 50~60V The anodic oxidation is carried out under the condition of the constant voltage mode, and the time is 1-1.3h, and the titanium dioxide nanotube array whose surface is covered with the nanoporous layer is obtained. Oth...

specific Embodiment approach 3

[0032] Specific embodiment three: the difference between this embodiment and specific embodiment two is that the pretreatment described in step a is specifically carried out according to the following steps: the pure titanium plate with a purity ≥ 99.9% is sequentially used with 600#, 1000#, 2000# gold Grind with sandpaper until there are no visible traces on the surface, then put it in acetone for ultrasonic cleaning, then wash it with deionized water, then soak it in chemical lotion for chemical cleaning, and finally clean it with deionized water, dry, and complete the preparatory process. treatment; wherein the chemical washing liquid is mixed by hydrofluoric acid, nitric acid and water according to the volume ratio of 1:4:5, the mass concentration of hydrofluoric acid is 40%, and the mass concentration of nitric acid is 65%-68 %; the immersion time of chemical cleaning is 30-60 seconds; the impurities and oxide layer on the surface of the pure titanium plate are removed thr...

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Abstract

The invention discloses a method for eliminating a nano porous layer on the surface of a titanium dioxide nano tube array, and relates to a method for eliminating a titanium dioxide nano porous layer. The invention provides a method for eliminating a nano porous layer covering the surface of a titanium dioxide nano tube array which is prepared by using an electrochemical anode oxidation method. The method comprises the following steps of: firstly, preparing a soaking liquid by using deionized water, hydrofluoric acid and nitric acid; and secondly, soaking the titanium dioxide nano tube array of which the surface is covered by the nano porous layer into the soaking liquid, taking out after soaking, washing by using the deionized water so as to eliminate the nano porous layer covering the surface of the titanium dioxide nano tube array. By utilizing the method, not only is the nano porous layer on the surface effectively eliminated, but also the structure of the titanium dioxide nano tube array is kept, and the operation that other nano materials of nano points, nano wires, nano rods and the like are assembled in nano tubes can be successfully carried out. The treated titanium dioxide nano tube array can be applied to the field of water treatment.

Description

technical field [0001] The invention relates to a method for removing a nanoporous layer on the surface of a titanium dioxide nanotube array. Background technique [0002] With the rapid development of the world economy, the problem of water pollution is becoming more and more serious. Organic pollutants in water have obvious toxic effects on human body and organisms. Elimination of organic pollutants in water has become an important issue in the field of environmental protection. Semiconductor photocatalytic degradation technology uses holes and hydroxyl radicals generated by semiconductor catalysts under the irradiation of sunlight to decompose refractory organic matter into non-toxic carbon dioxide, water and other small inorganic molecules. It has the advantages of high efficiency and environmental friendliness. An ideal water pollution treatment method. [0003] TiO 2 The powder particles are small, and there are disadvantages such as easy aggregation, difficult separ...

Claims

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Application Information

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IPC IPC(8): C01G23/047B82Y40/00B82Y30/00
Inventor 吴晓宏齐敬秦伟
Owner HARBIN INST OF TECH
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