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Method for degrading phenol-containing wastewater through modified TiO2 catalyst in rotating disk reactor

A catalyst and reactor technology, which is applied in the field of modified TiO2 catalyst to degrade phenol-containing wastewater, can solve the problems of reducing the contact area between catalyst particles and organic pollutants, reducing the utilization rate of catalyst surface, and low carrier utilization rate, etc., to achieve convenience Effects of in-situ doping modification, reduction of embedding phenomenon, and improvement of light energy utilization

Active Publication Date: 2016-04-13
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are three problems, (1) pure TiO 2 The photogenerated electron-hole pairs of the catalyst are easy to recombine, which makes the carrier utilization rate low, which is reflected in the degradation rate of phenol-containing wastewater is only 40% in 2 hours; (2) The binder method has a certain degree of embedding of the catalyst particles, The contact area between catalyst particles and organic pollutants is reduced, which reduces the utilization rate of the catalyst surface; (3) In the patent, the reactor is equipped with ultraviolet lamps above and below the turntable, and the distance between the horizontally placed ultraviolet lamps below the turntable and the inner wall of the reactor is relatively small. Far away, the light intensity attenuation is serious, and the economic investment is increased when the degradation rate is low; in actual operation, it is difficult to load the catalyst on the inner wall of the reactor; the light source is composed of two linear ultraviolet lamps, and the light intensity on the plate is not uniform , the difference between the light intensity directly below the lamp and the edge of the turntable is 10mW / cm 2 Left and right, far away from the lamp tube, the light intensity attenuation is serious

Method used

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  • Method for degrading phenol-containing wastewater through modified TiO2 catalyst in rotating disk reactor
  • Method for degrading phenol-containing wastewater through modified TiO2 catalyst in rotating disk reactor
  • Method for degrading phenol-containing wastewater through modified TiO2 catalyst in rotating disk reactor

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Preparation of pure TiO by sol-gel method 2 Catalyst sol, the specific ratio of raw materials is: butyl titanate: water: ethanol: hydrochloric acid: acetylacetone = 1: 3: 15: 0.05: 0.5 (mass ratio); the preparation process is: first mix the total amount of raw materials and solvent Mix 2 / 3 of the total amount of water, catalyst, modified ion, and solvent to form liquid A; add 1 / 3 of the total amount of water, catalyst, modified ion, and solvent to form liquid B; after stirring liquid A evenly, add liquid B drop by drop, Continue stirring for 0.5~2h after the dropwise addition to obtain a modified catalyst sol.

[0041] A rotating disk reactor is used for loading, and the rotating disk reactor is the rotating disk reactor described in the published patent CN103387272A. Such as figure 1 , 2 As shown, the turntable reactor includes a housing 8, a turntable 3, a rotating shaft 5, an excitation light source 2, a liquid inlet pipe 1 and a liquid outlet pipe 4, the liquid ...

Embodiment 2

[0050] Preparation of modified TiO by sol-gel method 2 For the catalyst sol, the molar ratio of each raw material is tetraisobutyl titanate: water: ethanol: nitric acid: acetylacetone: Fe=1:2:20:0.05:1:0.005.

[0051] Other operating steps are the same as in Example 1.

[0052] The carrier turntable is made of stainless steel, the diameter of the turntable is 200mm, 6 layers are loaded, the calcination temperature is 450°C, the temperature is kept for 1.5h, and the amount of loaded catalyst is 1.33g. Prepare 100mg / L phenol wastewater to simulate phenol-containing wastewater, and adjust to pH=7. Pour the wastewater into the storage tank, pump the wastewater into the rotating disk reactor through the flow meter, and return it to the storage tank under gravity for circulation after photocatalytic degradation. The light source adopts two linear ultraviolet lamps, the flow rate is 100L / h, the speed is 50rad / min, and the light intensity is 12mW / cm 2 , The degradation rate of phen...

Embodiment 3

[0054] Preparation of modified TiO by sol-gel method 2 For the catalyst sol, the molar ratio of each raw material is butyl titanate: water: isopropanol: hydrochloric acid: diethanolamine: V=1:1:10:0.05:0.5:0.01.

[0055] Other operating steps are the same as in Example 1.

[0056] The carrier turntable is made of stainless steel, the diameter of the turntable is 200mm, 3 layers are loaded, the calcination temperature is 500°C, the temperature is kept for 1h, and the amount of catalyst loaded is 0.48g. Prepare 100mg / L phenol wastewater to simulate phenol-containing wastewater and adjust to pH=4. Pour the wastewater into the storage tank, pump the wastewater into the rotating disk reactor through the flow meter, and return it to the storage tank under gravity for circulation after photocatalytic degradation. The light source adopts two linear ultraviolet lamps, the flow rate is 80L / h, the speed is 50rad / min, and the light intensity is 12mW / cm 2 , The degradation rate of pheno...

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Abstract

The invention discloses a method for degrading phenol-containing wastewater through a modified TiO2 catalyst in a rotating disk reactor. The method comprises the following steps that 1, in-situ doping modification of a catalyst is conducted to prepare modified catalyst sol; 2, catalyst loading is conducted; 3, a uniform light source is designed and installed; 4, the phenol-containing wastewater is degraded. According to the method for degrading the phenol-containing wastewater through the modified TiO2 catalyst in the rotating disk reactor, preparation, ion doping modification and loading of the catalyst are completed in one time through a sol-gel method, and the technology is applied to the rotating disk reactor, the advantages of the technology and the rotating disk reactor are combined, and the photocatalytic degradation efficiency of the phenol-containing wastewater is improved.

Description

technical field [0001] The invention relates to a modified TiO in a rotating disk reactor 2 The invention discloses a method for degrading phenolic wastewater with a catalyst, belonging to the technical field of wastewater treatment. Background technique [0002] Photocatalytic oxidation technology has the characteristics of low energy consumption and no secondary pollution, and can completely mineralize organic matter into water, CO 2 It is a green and environmentally friendly organic wastewater treatment method. There are two main methods of photocatalytic treatment of wastewater: suspension method and loading method. In the suspension method, the nano-catalyst particles are in full contact with organic pollutants, and the solid-liquid mass transfer effect is good, but the separation of the catalyst becomes a technical problem. Although the loading method solves the separation problem of the catalyst, the mass transfer effect of this method is reduced because the loadin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/32C02F101/34
CPCY02W10/37C02F1/725C02F1/32C02F2101/345C02F2305/10
Inventor 刘有智张世光张巧玲罗莹魏冰栗秀萍申红艳高璟祁贵生焦纬洲
Owner ZHONGBEI UNIV
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