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Technique for treating organic substance difficukt to be degradated in water through opto-electronic electrode

A technology of refractory organic matter and photoelectrode, which is applied in the field of environmental chemical photocatalytic water treatment, and can solve the problem of refractory mineralization of intermediate products

Inactive Publication Date: 2006-04-19
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Abroad also has high oxygen evolution electrode SnO 2 Used for direct anodic oxidation of chlorophenols in water (Environ Sci Technol, 1999, 33:1453-1457) but the degradation intermediates are difficult to further mineralize
The research on antimony-doped tin dioxide photoelectrocatalysis for refractory organic water treatment has not been reported yet

Method used

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  • Technique for treating organic substance difficukt to be degradated in water through opto-electronic electrode

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Effect test

Embodiment approach 1

[0014] Antimony-doped tin dioxide is coated on the pre-treated titanium sheet by dipping and pulling process to make antimony-doped tin dioxide thin film photoelectrode. The electrode is used as the anode and the air oxygen electrode is used as the cathode, and the phenol aqueous solution is treated. The process conditions are: antimony-doped tin dioxide film electrode is used as photoanode, air oxygen electrode is used as cathode, the distance between the cathode and anode is 4cm, 250W 365nm ultraviolet lamp is used as the central light source, and the air flow rate is 0.3m 3 / h, voltage 0.5V. The treatment time is 2 hours, samples are taken and analyzed at regular intervals, the conversion rate of phenol is measured by spectrophotometry, and the change of COD concentration of the reaction solution is determined in each time period. The results show that: after 1 hour of photocatalytic reaction, the phenol conversion rate of 50mg / L, 100mL phenol aqueous solution is close to 1...

Embodiment approach 2

[0016] Antimony-doped tin dioxide is coated on the pre-treated silicon carbide wafer by dipping and pulling process to make antimony-doped tin dioxide thin film photoelectrode. The electrode is used as the anode, and the air oxygen electrode is used as the cathode, and the phenol aqueous solution is treated. . The process conditions are: antimony-doped tin dioxide film electrode is used as photoanode, air oxygen electrode is used as cathode, the distance between the cathode and anode is 3cm, 250W 365nm ultraviolet lamp is used as side light source, and the air flow rate is 0.3m 3 / h, voltage 2V. The treatment time is 2 hours, samples are taken and analyzed at regular intervals, the conversion rate of phenol is measured by spectrophotometry, and the change of COD concentration of the reaction solution is determined in each time period. The results show that: after 2 hours of photoelectric catalytic reaction, the phenol conversion rate of 50mg / L, 100mL phenol aqueous solution i...

Embodiment approach 3

[0018] Antimony-doped tin dioxide is coated on the pre-treated silicon carbide wafer by dipping and pulling process to make antimony-doped tin dioxide thin film photoelectrode. The electrode is used as the anode, and the air oxygen electrode is used as the cathode, and the phenol aqueous solution is treated. . The process conditions are: antimony-doped tin dioxide film electrode is used as photoanode, air oxygen electrode is used as cathode, the distance between the cathode and anode is 3cm, 250W 365nm ultraviolet lamp is used as side light source, and the air flow rate is 0.3m 3 / h, voltage 5V. The treatment time is 2 hours, samples are taken and analyzed at regular intervals, the conversion rate of phenol is measured by spectrophotometry, and the change of COD concentration of the reaction solution is determined in each time period. The results show that: after 3 hours of photoelectric catalytic reaction, the phenol conversion rate of 50mg / L, 100mL phenol aqueous solution i...

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Abstract

A process for treating the organic substance difficult to degradate in water by photoelectric electrode features that the Sb doped SnO2 film electrode used as the photoelectric electrode and the air oxygen electrode as cathode are parallelly used and vertically arranged in photoelectrically catalytic reactor and the 365-nm ultraviolet light source is arranged in the center of said reactor or at its outside. Its advantage is the combination of oxidizing action of anode with reducing action of cathode to remove said organic substance from water thoroughly.

Description

technical field [0001] The invention relates to a process for treating organic matter in water by using a semiconductor photoelectric catalytic oxidation method, in particular to a process for treating refractory organic matter in water with an antimony-doped tin dioxide thin film photoelectrode. The invention belongs to the technical field of environmental chemical photoelectric catalysis water treatment. technical background [0002] Since the middle of the 20th century, with the rapid development of industry, a large number of non-living organic matter that did not exist in nature has been produced, most of which are refractory organic matter, posing a great threat to the ecological environment and human survival. [0003] Photoactive semiconductors (usually TiO 2 ) on the valence band (Fujishima A, Honda K, Nature, 1972, 238: 37-38; Matthews R.W.J. Catal. 1988, 111: 264-272; Ollis D F, Al-Ekabi H. Amsterdam: Elsevier, 1993 ), produce OH free radicals with strong oxidiz...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/46
Inventor 樊彩梅王韵芳梁镇海张晓燕王艳孙彦平
Owner TAIYUAN UNIV OF TECH
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