Catalyst composition for processing methylene blue dye wastewater and preparation method and applications of catalyst composition

A methylene blue dye and catalyst technology, which is applied in the field of inorganic functional material preparation, can solve the problems of weak oxidizing ability, selective oxidation, high dye removal rate, large amount of adsorbent, etc., and achieves high catalytic degradation efficiency, simple process flow, and easy preparation. simple method effect

Inactive Publication Date: 2013-02-20
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological method is affected by factors such as pH value, temperature, salt and dye type, which makes the effect of biological treatment not ideal
The operating cost of the coagulation method is high, the amount of sludge is large and dehydration is difficult, and the applicable pH range is narrow
The cost of advanced oxidation technology is high, and commonly used oxidants also show shortcomings such as weak oxidation ability and selective oxidation, and impurities are easily introduced during the treatment process to cause secondary pollution
The photocatalytic method requires a light source irradiation system, which is greatly affected by the weather in practical applications
The adsorption method is easily affected by suspended solids and oil in water, and the amount of adsorbent is large and the cost is high
Membrane separation methods are divided into electrodialysis, reverse osmosis, nanofiltration and ultrafiltration, etc. Among them, electrodialysis, reverse osmosis and nanofiltration have the advantages of high dye removal rate and the ability to recover dyes in wastewater. Simple, but the cost of the membrane used is high, and the operating pressure is high, resulting in high energy consumption of the membrane method, which affects its industrial application
Due to the large pore size of the membrane, the traditional ultrafiltration method is difficult to remove low molecular weight organic pollutants

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 0.54g sodium carbonate (5.1×10 -3 mol), 4.04g chromium nitrate nonahydrate (1.0×10 -2 mol), 3.58g ammonium molybdate tetrahydrate (2.9×10 -3 mol) and 25.47g of citric acid (0.13mol) were sequentially added to 60mL (3.33mol) of distilled water and stirred to dissolve. After adding 32.28 g of ethylene glycol (0.52 mol), stir for 10 min, raise the temperature to 120°C and continue stirring until a gel is formed. The gel was heated at 700°C for 30 hours to obtain 4.01 g of granular ternary composite oxide Na 2 O Cr 2 o 3 ●xMoO 3 (x=4) Catalyst.

[0029] Get 0.02 gram of the ternary composite oxide Na prepared by the above-mentioned method 2 O Cr 2 o 3 ●xMoO 3 (x=4) The catalyst degrades methylene blue aqueous solution. The methylene blue concentration is 110 mg / L and the volume is 40 mL. Catalytically degrade methylene blue at normal temperature and pressure under the action of stirring, take samples at regular intervals, and centrifuge for 10 minutes i...

Embodiment 2

[0031] 0.54g sodium carbonate (5.1×10 -3 mol), 4.04g chromium nitrate nonahydrate (1.0×10 -2 mol), 3.58g ammonium molybdate tetrahydrate (2.9×10 -3 mol) and 25.47g of citric acid (0.13mol) were sequentially added to 60mL (3.33mol) of distilled water and stirred to dissolve. After adding 32.28 g of ethylene glycol (0.52 mol), stir for 10 min, raise the temperature to 120°C and continue stirring until a gel is formed. The gel was heated at 800°C for 25 hours to obtain 4.00 g of granular ternary composite oxide Na 2 O Cr 2 o 3 ●xMoO 3 (x=4) Catalyst.

[0032]Get 0.02 gram of the ternary composite oxide Na prepared by the above-mentioned method 2 O Cr 2 o 3 ●xMoO 3 (x=4) The catalyst degrades methylene blue aqueous solution. The methylene blue concentration is 110 mg / L and the volume is 40 mL. Catalytically degrade methylene blue at normal temperature and pressure under the action of stirring, take samples at regular intervals, and centrifuge for 10 minutes in a c...

Embodiment 3

[0034] 0.54g sodium carbonate (5.1×10 -3 mol), 4.04g chromium nitrate nonahydrate (1.0×10 -2 mol), 3.58g ammonium molybdate tetrahydrate (2.9×10 -3 mol) and 25.47g of citric acid (0.13mol) were sequentially added to 60mL (3.33mol) of distilled water and stirred to dissolve. After adding 32.28 g of ethylene glycol (0.52 mol), stir for 10 min, raise the temperature to 120°C and continue stirring until a gel is formed. The gel was heated at 900°C for 20 hours to obtain 4.03 g of granular ternary composite oxide Na 2 O Cr 2 o 3 ●xMoO 3 (x=4) Catalyst.

[0035] Get 0.02 gram of Na prepared by the above method 2 O Cr 2 o 3 ●xMoO 3 (x=4) The catalyst degrades methylene blue aqueous solution. The methylene blue concentration is 110 mg / L and the volume is 40 mL. Catalytically degrade methylene blue at normal temperature and pressure under the action of stirring, take samples at regular intervals, and centrifuge for 10 minutes in a centrifuge to get the supernatant. Ab...

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PUM

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Abstract

The invention discloses a catalyst composition for processing methylene blue dye wastewater and a preparation method and applications of the catalyst composition. The method includes adding sodium compounds, chromium salts, molybdate and citric acids into water successively, stirring and dissolving the mixture, adding ethylene glycol, heating the mixture to a temperature of 100 DEG C to 130 DEG C, and stirring the mixture continuously to form gel; and heating the gel at a temperature ranging from 600 DEG C to 1200 DEG C for 5 hours to 48 hours to obtain a ternary composite oxide Na2O*Cr2O3*xMoO3 (x=1-8) catalyst. The catalyst can process methylene blue dye wastewater effectively in no need of oxidants or light illumination. As for methylene blue with a concentration of 110mg / L, the degradation rate of the catalyst can achieve more than 90.0% in 75 minutes, and the catalyst can be recycled for a plurality of times.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic functional materials, and relates to a catalyst composition for treating methylene blue dye wastewater, in particular to a ternary composite oxide Na that can degrade methylene blue dye wastewater 2 O Cr 2 o 3 ●xMoO 3 (x=1~8) Catalyst and its preparation method and application. Background technique [0002] At present, organic dye wastewater has become one of the main sources of water pollution. The wastewater has the characteristics of large water volume, high concentration, complex composition, deep color and refractory degradation. Most dyes also have toxic, carcinogenic, teratogenic and mutagenic effects. Methylene blue is an important organic chemical synthetic cationic dye with a wide range of industrial applications. For example, it can be applied to the dyeing of hemp, silk fabrics, paper, bamboo and wood, the dyeing of biological and bacterial tissues, and the manuf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/28C02F1/00C02F101/38
Inventor 周国华李俊万雷杜雅媚高婷婷
Owner HUBEI UNIV OF TECH
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