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Method for coprocessing crystal violet polluted sewage by outdoor natural light-hydrogen peroxide

A technology of hydrogen peroxide and synergistic treatment, which is applied in the direction of oxidized water/sewage treatment, illuminated water/sewage treatment, etc., achieving the effect of simple process and easy promotion

Inactive Publication Date: 2011-08-03
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to combine photocatalytic technology and H 2 o 2 oxidation techniques combined to H 2 o 2 As an oxidant, by adding the catalyst bismuth silicate and irradiating with outdoor natural light, the refractory crystal violet is decolorized, learn from each other, and play H 2 o 2 The advantages of simple operation and mild conditions, supplemented by photocatalytic technology with low selectivity and high oxidation degree, overcome the existing H 2 o 2 Insufficient of oxidation technology and photocatalytic technology, provide a simple, efficient, no secondary pollution, complete degradation of crystal violet wastewater treatment method

Method used

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  • Method for coprocessing crystal violet polluted sewage by outdoor natural light-hydrogen peroxide
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  • Method for coprocessing crystal violet polluted sewage by outdoor natural light-hydrogen peroxide

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Experimental program
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Effect test

Embodiment 1

[0027] Disperse 0.1 g of bismuth silicate photocatalyst in 100 mL of crystal violet solution with an initial concentration of 40 mg / L, and ultrasonicate the mixture for 30 min under dark conditions to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark, and after reaching adsorption equilibrium, 3 mL of hydrogen peroxide with a mass fraction of 30% was added, stirred and mixed evenly. The photocatalytic reactor was placed in the outdoor natural light and irradiated vertically, and the reaction was stirred for 2 h. After the reaction was completed, the photocatalyst was separated and recovered by suction filtration. During the reaction process, samples were taken every 20 min, and the supernatant was collected by centrifugation, and the concentration of crystal violet was analyzed and quantified with a UV-Vis spectrophotometer (Varian, cary50).

[0028] figure 1 is the change of crystal violet c...

Embodiment 2

[0030] Disperse 0.1 g of bismuth silicate photocatalyst in 100 mL of crystal violet solution with an initial concentration of 30 mg / L, and ultrasonicate the mixture for 30 min under dark conditions to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark, and after reaching adsorption equilibrium, 2 mL of 30% hydrogen peroxide was added, stirred and mixed evenly. The photocatalytic reactor was placed in the outdoor natural light and irradiated vertically, and the reaction was stirred for 2 h. After the reaction was completed, the photocatalyst was separated and recovered by suction filtration. During the reaction process, samples were taken every 20 min, and the supernatant was collected by centrifugation, and the concentration of crystal violet was analyzed and quantified with a UV-Vis spectrophotometer (Varian, cary50).

[0031] After 2 hours of reaction, the decolorization rate of crystal viole...

Embodiment 3

[0033] Disperse 0.1 g of bismuth silicate photocatalyst in 100 mL of crystal violet solution with an initial concentration of 30 mg / L, and ultrasonicate the mixture for 30 min under dark conditions to completely disperse the catalyst in the solution. Before irradiation, the mixture was magnetically stirred for 30 minutes in the dark, and after reaching adsorption equilibrium, 1.5 mL of 30% hydrogen peroxide was added, stirred and mixed evenly. The photocatalytic reactor was placed in the outdoor natural light and irradiated vertically, and the reaction was stirred for 2 h. After the reaction was completed, the photocatalyst was separated and recovered by suction filtration. During the reaction process, samples were taken every 20 min, and the supernatant was collected by centrifugation, and the concentration of crystal violet was analyzed and quantified with a UV-Vis spectrophotometer (Varian, cary50).

[0034] After 2 hours of reaction, the decolorization rate of crystal vio...

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Abstract

The invention discloses a method for coprocessing crystal violet polluted sewage by utilizing outdoor natural light-hydrogen peroxide. The method comprises the steps of: mixing and stirring photochemical catalyst and the sewage to be processed, and carrying out ultrasonic dispersion and adsorption equilibrium; adding the hydrogen peroxide; and carrying out outdoor natural light irradiation, filtering, separating, recovering the photochemical catalyst, and the like. By combining the hydrogen peroxide and the outdoor natural light, the method can generate hydroxyl free radical with strong oxidation capacity and has stronger oxidation capability for the high-concentration crystal violet printing and dyeing waste water which is difficult in biodegradation, thus achieving the aim of thoroughlypurifying the crystal violet polluted sewage with high efficiency.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to the field of treating crystal violet polluted sewage, and specifically relates to a method for efficiently removing high-concentration crystal violet in water by using the synergistic effect of outdoor natural light and hydrogen peroxide. Background technique [0002] The pollution of water resources by printing and dyeing wastewater has become a very serious problem, and it is one of the most difficult industrial wastewater to treat. As a triphenylmethane dye, crystal violet has a very wide range of uses. In addition to being used in textile, printing and dyeing and ink industries, it can also be used for dyeing paper, toys and some plastic products. According to reports, about 5% to 10% of crystal violet in the printing and dyeing industry is discharged into natural water bodies due to low process efficiency. These dyes accumulate in natural water bodies and pose a serious threa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/30C02F1/72
Inventor 牛军峰李阳段延佩王文龙
Owner BEIJING NORMAL UNIVERSITY
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