Photocatalysis oxidation treated high concentration organic trade waste

An industrial wastewater, high-concentration technology, applied in the direction of oxidized water/sewage treatment, catalyst carrier, energy wastewater treatment, etc., can solve the problems of complex components, water pollution and environmental hazards, and achieve high diffusion degree, high catalytic activity, and reduced pore size. The effect of internal surface tension

Inactive Publication Date: 2008-07-16
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

[0002] With the development of industry, the amount of industrial wastewater is increasing day by day, and its composition is becoming more and more complex. There are usually two final outlets for industrial wastewater, that is, to irrigate farmland or discharge into water bodies. If a large amount of industrial wastewater cannot be treated well, it will inevitably Will cause serious pollution of water bodies and endanger the environment

Method used

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  • Photocatalysis oxidation treated high concentration organic trade waste

Examples

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Comparison scheme
Effect test

Embodiment 1

[0031] Implementation Example 1: Measure 248.4 mL of concentrated hydrochloric acid and put it into a 500 mL volumetric flask, add water to dilute to the mark and shake well to prepare 6 mol / L hydrochloric acid. Measure 236.4mLTiCl 4 Concentrated solution, slowly added to a 2000mL beaker placed in an ice-water bath in a fume hood, and at the same time slowly added 263.60mL of prepared hydrochloric acid solution, and kept stirring rapidly until TiCl 4 All dissolved to get 4mol / L TiCl 4 solution. Accurately measure 9.37mL into a 500mL beaker, add water to 114mL, add 5mL AEO-3, 0.01mol / L FeCl 3 Solution 3.75mL, 9g activated carbon. Slowly add 3moL / lNH 3 until the pH value reaches 8-9. Aging for 10-40 hours, washed with water until Cl-free - . Exchange water with ethanol to obtain an alcohol gel, dry at 100°C, and calcinate the obtained catalyst in a muffle furnace at 600°C for 1 hour to obtain a supported nanocomposite photocatalyst. 4g of the obtained catalyst was used t...

Embodiment 2

[0032] Implementation Example 2: Accurately measure 10mL of 4mol / L TiCl 4 Put it into a 500ml beaker, add water to 120mL, add 10mL triethanolamine, stir for 1 hour; add 0.1mol / L Ce(NO 3 ) 3 solution, so that the mass percentage of Ti:Ce is 1:0.03, then add 9g of ZSM-5, and slowly add 1mol / L KOH dropwise until the pH value reaches 8-9. Then age for 10-40 hours, wash with water until it does not contain Cl - . Exchange water with ethanol to obtain an alcohol gel, move it to a high-pressure reactor for supercritical reaction, and calcinate the obtained catalyst in a muffle furnace at 550° C. for 1 hour to obtain a nanocomposite photocatalyst. The UV light was irradiated for 6 hours, and then the fluorescent lamp was irradiated for 8 hours. The amount of catalyst was 3.5g. The measured COD value in 300mL was 25000mg / L Rhodamine-6G, and the degradation rate of Rhodamine B was 98%.

Embodiment 3

[0033] Implementation Example 3: Accurately measure 9.37mL of 4mol / L TiCl 4 Put in a 500mL beaker and add water to 114mL, add 5mL AEO-9 and 0.1mol / L FeCl 3 The solution has a mass percentage of Ti:Fe of 1:0.02, then adds 9g of hollow glass beads, then slowly adds 0.1mol / L KOH until the pH value is 8-9, ages for 10-40 hours, and washes with water until there is no Cl - After that, the water was exchanged with ethanol, and supercritical drying was carried out for 0.5 hour to obtain alcohol gel. The alcohol gel was calcined at 500°C for 1.5 hours to obtain a composite photocatalyst supported by hollow glass spheres. Under the irradiation of ultraviolet light and visible light at the same time, the amount of catalyst was 2g to degrade 300mL salicylic acid with a concentration of 20000mg / L, and the COD degradation rate reached 95.5% in 8 hours.

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Abstract

The invention relates to a modified loading nano composite photocatalyst which takes titanium dioxide as main part and adopts new reaction technique to degraded the organic industrial wastewater in a water processing system (see attached drawing 1 in Instruction). The main point on preparing the catalyst lies in that titanium dioxide active compounds loaded on different carriers are employed to prepare a loading photocatalyst with grain diameter of 5-40nm; meanwhile, different elements are mixed into the loading photocatalyst to reduce the composition between photoproduciton electron and cavity, which enables the catalyst to move the light absorbing wavelength thereof towards the visible regions, thus effectively improving the degradation rate of organic pollutants as a new environmental-friendly catalyst. As to the new technique of processing the organic industrial wastewater, the invention overcomes the defects that the present photocatalysts are only used for degrading the organic industrial wastewater with low concentration. The catalyst being irradiated respectively or simultaneously under sunbeam and ultraviolet light can decrease COD values of high-concentration organic industrial wastewater from 10000-40000mg / L to less than 100mg / L in short time, thus meeting the national emission standard.

Description

technical field [0001] The invention relates to the preparation of a supported nanocomposite photocatalyst with titanium dioxide as the main body and its application process. Among them, the method of co-precipitation combined with sol-gel is adopted, and the modification is carried out by loading and doping different elements of titanium dioxide on different supports to prepare a nanocomposite photocatalyst with a particle size of 5-40nm, which not only improves the photocatalytic activity. , and also reduce the degree of recombination of photogenerated electrons and holes. The catalyzer can be used in water treatment device (see specification attached figure 1 ), respectively or simultaneously using the irradiation conditions of ultraviolet light and visible light, effectively degrades organic pollutants, and is a new generation of environmentally friendly catalysts. This photocatalyst overcomes the shortcoming that the current photocatalytic technology can only be used to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J32/00C02F1/72
CPCY02W10/37
Inventor 张敬畅胡斌曹维良
Owner BEIJING UNIV OF CHEM TECH
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