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Method for treating industrial waste water by means of photoelectrocatalysis

A photoelectric catalysis, industrial wastewater technology, applied in chemical instruments and methods, light water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of powder falling off, photocatalytic effect attenuation, etc. Visible light response, the process is environmentally friendly

Inactive Publication Date: 2010-08-11
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the powder of this solid-supported catalyst will fall off after being used for a period of time, and its photocatalytic effect will gradually decline with the prolongation of the use time.

Method used

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  • Method for treating industrial waste water by means of photoelectrocatalysis
  • Method for treating industrial waste water by means of photoelectrocatalysis
  • Method for treating industrial waste water by means of photoelectrocatalysis

Examples

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example 1

[0017] Using pure titanium sheet (99.6%) as the starting material, it is mechanically polished, chemically polished, and ultrasonically cleaned in sequence as the anode, high-purity graphite sheet as the cathode, and 0.5wt% HF aqueous solution as the electrolyte. The constant pressure oxidation condition is: 20V, 30min , 10±2°C; heat treatment conditions: 500°C, 120min. TiO prepared under this condition 2 The nanotube array is the photoelectrode, the high-purity graphite is the counter electrode, and the hexavalent chromium ion can be completely degraded by the method of the invention in about 3 hours.

example 2

[0019] Using pure titanium sheet (99.6%) as the starting material, after mechanical grinding, chemical polishing, and ultrasonic cleaning, it is used as the anode, and high-purity graphite sheet is used as the cathode, 0.2wt% HF + 0.3wt% NH 4 F+C 3 h 8 o 3 The organic solution is the electrolyte, and the constant pressure oxidation condition is: 50V, 6h, 10±2°C; the heat treatment condition: 500°C, 120min. TiO prepared under this condition 2 The nanotube array is the photoelectrode, the high-purity graphite is the counter electrode, and 0.05M Na is added 2 SO 4 , the results of photoelectrocatalytic treatment of ammonia nitrogen wastewater are shown in image 3 , Test conditions: bias +1.0V, temperature 30±5°C, air flow 250ml / min (for 200ml solution), N initial concentration 100mg / L, pH=11 (adjusted with 10% NaOH solution). From image 3 It can be seen that under the condition of photoelectric catalysis and simultaneous stripping, the method of the present invention als...

example 3

[0021] Using pure titanium sheet (99.6%) as the starting material, after mechanical grinding, chemical polishing, and ultrasonic cleaning, it is used as the anode, and high-purity graphite sheet is used as the cathode, 0.2wt% HF + 0.3wt% NH 4 F+C 3 h 8 o 3 The organic solution is the electrolyte, and the constant pressure oxidation condition is: 50V, 6h, 10±2°C; the heat treatment condition: 500°C, 120min. TiO prepared under this condition 2 The nanotube array is used as the photoelectrode, and the high-purity graphite is used as the counter electrode. The experimental results of the photoelectrocatalytic treatment of the composite wastewater of methylene blue and hexavalent chromium ions are shown in Figure 4 . Obviously, for the hexavalent chromium ion, it can be completely degraded in about 40 minutes by the method of the present invention. For methylene blue, the 2h degradation rate can reach 76.49%.

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Abstract

The invention provides a method for treating industrial waste water by means of chemical oxidation or chemical deoxidation in photoelectrocatalysis, belonging to the field of environmental protection. The method comprises the following steps of: taking a titanium positive electrode oxidation method-prepared high-ordered titanium-based TiO2 nanotube array thin film as an optical positive electrode or an optical negative electrode; taking high-purity black lead as an electrode; and degrading organic matter or heavy metal ion of the industrial waste water into H2O and CO2, low valent metal ion or metal simple substance under the conditions of the connection of an external circuit and the optical radiation. The invention has the advantages that: the adopted catalytic agent optical positive electrode is the high-ordered array thin film which is self assembled by anodic oxidation and is perpendicular to the bottom of the titanium base, thereby not only overcoming the defects of the existing powder body loading thin film optical positive electrode such as bad bond, easy falling and gradually-attenuated catalysis efficiency, but also being capable of directly using the sunlight by doping the modifying property to the array thin film, and being an advanced technology for treating single waste water (dye such as paper mill organic waste water, printing and dyeing mill organic waste water, or heavy metal ion such as electroplate factory chromium-containing waste water) or complex waste water with energy saving, high efficiency, high selectivity, cleaning and low cost.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment in terms of environmental protection and treatment. Highly ordered TiO prepared by titanium anodization 2 The nanotube array film is the photoelectrode material, and the high-purity graphite or base metal material is the counter electrode. Under the action of 0-3V DC bias and sunlight or simulated sunlight radiation, the organic matter in the dye or pesticide wastewater is completely removed from the anode. mineralized to H 2 O and CO 2 , to reduce heavy metal ions to low-valent ions or metal elements. This technology combines the advantages of electrocatalysis and photocatalysis, through the rapid transport of photogenerated electrons by the external circuit and the cathode migration of photogenerated holes assisted by the electric field, the separation of photogenerated electron-hole pairs is accelerated, and the possibility of their recombination is reduced, which can significan...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/48C02F1/72C02F1/58C02F101/22C02F101/30C02F101/36C02F101/14
CPCY02W10/37
Inventor 刘中清李丹丹颜欣
Owner SICHUAN UNIV
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