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Electrocatalytic porous titanium filter membrane with micro nano structure and preparation method thereof

A technology of micro-nano structure and porous titanium, applied in chemical instruments and methods, chemical elements of heterogeneous catalysts, physical/chemical process catalysts, etc., can solve problems such as low specific surface area, restrictions on flat titanium electrodes, and high energy consumption

Inactive Publication Date: 2017-08-08
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the metal oxide coated electrode with flat titanium as the substrate is one of the most widely used electrode materials in the field of electrocatalytic oxidation, and has been widely used in electrochemical oxidation wastewater treatment and various electrochemical industries, but the mass transfer performance Poor, high energy consumption, low current efficiency and other issues have been restricting the development of flat titanium electrodes
[0003] Therefore, the porous titanium filter membrane is used as the substrate to prepare the electrocatalytic filter membrane loaded with metal oxides, which can not only give full play to the flow-through electrode configuration and pore effect of the porous titanium itself, but also rely on forced convection to promote the mass transfer of pollutants. Its three-dimensional, continuous, and porous structure can provide more carrying area for the construction of the active layer, promote the improvement of the catalytic activity of the electrode and the degradation efficiency of pollutants, so as to simultaneously improve the poor mass transfer performance of the traditional flat plate and the traditional carbon-based conductive film. The disadvantages of poor electrochemical stability, easy oxidation and low catalytic activity are ubiquitous in filter materials.
However, the existing porous titanium membrane still has a relatively low specific surface area (about 0.1 m 2 / g), the porosity is too small (about 30%), so it is urgent to reconstruct the pores of the porous titanium matrix before preparing the electrocatalytic porous filter membrane.

Method used

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  • Electrocatalytic porous titanium filter membrane with micro nano structure and preparation method thereof
  • Electrocatalytic porous titanium filter membrane with micro nano structure and preparation method thereof

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Embodiment 1

[0019] 1) Pretreatment of porous titanium substrate: select flat porous titanium as the substrate, with an average pore size of 30 μm, soak the porous titanium in a mixed acid solution of HF acid and HCl for 15 minutes, where the volume ratio of concentrated HF acid: concentrated HCl acid: deionized water The ratio is 1.5:1.5:200, and then washed with absolute ethanol and placed in a vacuum dryer, then vacuum-dried at 80°C, cooled to room temperature for use;

[0020] 2) Construction of micro-nano structure TiO by hydrothermal method 2 Nanowire middle layer: place the pretreated porous titanium in step 1) in a high-pressure reactor containing 5 mol / L NaOH solution, and conduct a hydrothermal reaction at 180°C for 24 h. After cooling, take out the porous titanium sample and remove it. Wash with deionized water, then soak in 0.1 mol / L HCl solution for 24 hours, dry at 80°C, and finally transfer to muffle furnace for sintering at 500°C for 2h, cool to room temperature for use;

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Embodiment 2

[0023] 1) Pretreatment of porous titanium substrate: select tubular porous titanium as the substrate, with an average pore size of 50 μm, soak the porous titanium in a mixed acid solution containing HF acid and HCl acid for 15 min, in which concentrated HF acid: concentrated HCl acid: remove The volume ratio of ionic water is 1:1:200, and then washed with absolute ethanol and placed in a vacuum drying chamber, then dried in a vacuum at 80°C, and cooled to room temperature for use;

[0024] 2) Construction of micro-nano structure TiO by hydrothermal method 2 The middle layer of nanoflowers: place the pretreated porous titanium in step 1) in a high-pressure reactor containing 6 mol / L NaOH solution, and conduct a hydrothermal reaction at 180°C for 12 h. After cooling, take out the porous titanium sample and remove it. Wash with deionized water, then soak in 0.1 mol / L HCl solution for 24 hours, dry at 80°C, and finally transfer to muffle furnace for sintering at 500°C for 2h, cool...

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Abstract

An electrocatalytic porous titanium filter membrane with a micro nano structure and a preparation method thereof are disclosed, the electrocatalytic porous titanium filter membrane comprises a porous titanium film matrix, a TiO2 middle layer with the micro nano structure and an electrocatalytic active layer loaded on the TiO2 middle layer, the TiO2 middle layer with the micro nano structure is TiO2 nano flower, nanowire, nanorod or nanotube aggregates growing in situ on the porous titanium film matrix, and the electrocatalytic active layer is PbO2, SnO2, RuO2, IrO2, Sb2O5, Bi2O3 and other transition metal oxides or a composite comprising the various metal oxides. The method comprises three main steps: pretreatment of the porous titanium matrix, construction of the middle layer with the micro nano structure and loading of the active layer. The electrocatalytic porous titanium filter membrane has excellent mass transfer performance, high electrocatalytic activity, high pollutant removal efficiency, low energy consumption, and the like, thus having a good application prospect in the field of organic wastewater treatment.

Description

[0001] The invention relates to an electrocatalytic porous titanium filter membrane with a micro-nano structure and a preparation method thereof, in particular to a micro-nano structure TiO 2 The porous titanium filter membrane in the middle layer can effectively increase the specific surface area of ​​the porous titanium substrate through the construction of the middle layer, improve the pore structure of the porous titanium, and at the same time enhance the adhesion between the active layer and the porous titanium substrate, and prolong the electrocatalytic porous titanium filter membrane. lifespan. The invention can be used simultaneously as a membrane filter material and an electrocatalytic material for refractory organic wastewater treatment, slightly polluted drinking water treatment, regenerated water treatment and other polluted water treatment, and belongs to the fields of electrocatalysis, membrane filtration and wastewater treatment. Background technique [0002] Co...

Claims

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Application Information

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IPC IPC(8): B01J23/14B01J23/18B01J21/06B01J35/10B01J35/06B01D71/02B01D69/04B01D69/06B01D67/00
CPCB01D67/0039B01D69/04B01D69/06B01D71/024B01J21/063B01J23/002B01J23/14B01J23/18B01J2523/00B01J35/59B01J35/60B01J2523/44B01J2523/47B01J2523/43B01J2523/53
Inventor 李新洋郑建中刘桂成
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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