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Method utilizing small-molecule diketone to serve as optical active agent for oxidation treatment of dye waste water

A technology of dye wastewater and photoactive agent, which is applied in oxidation water/sewage treatment, light water/sewage treatment, textile industry wastewater treatment, etc., can solve the problems of large consumption of reagents, poor reaction selectivity, low decolorization efficiency, etc. Efficient and fast decolorization effect

Active Publication Date: 2012-08-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the common problems of poor reaction selectivity, large reagent consumption and low decolorization efficiency in the existing dye wastewater treatment methods, the present invention provides a method for oxidatively treating dye wastewater by using small molecule diketones as photoactive agents. The ketone triggers the reaction under the irradiation of ultraviolet light to realize the efficient and rapid decolorization of dye wastewater. It can be applied to the treatment of printing and dyeing wastewater and dye-polluted water bodies. In addition, it also provides ideas for the treatment of polluted water bodies where dye-diketone coexists

Method used

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  • Method utilizing small-molecule diketone to serve as optical active agent for oxidation treatment of dye waste water

Examples

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Effect test

Embodiment 1

[0027] Filter the dye-containing wastewater to remove suspended matter; then fill 25 ml of 2,3-butanedione aqueous solution containing 0.2 mM Orange II and 1 mM into a quartz test tube with an inner diameter of 2 cm 1-a , put 25 ml of aqueous solution containing 0.2 mM orange II and 1 mM 2,5-hexanedione into a quartz test tube with an inner diameter of 2 cm 1-b , 25 ml containing 0.2 mM Orange II and 1 mM H 2 o 2 The aqueous solution was filled into a quartz test tube with an inner diameter of 2 cm 1-c， Place the quartz test tube parallel to the 300 W medium pressure mercury lamp 2 Axial orientation position placement, mercury lamp 2 cooling water jacket 3 Medium, quartz test tube distance from mercury lamp 2 The distance is 6 cm. Turn on the mercury lamp 2 Preheat for 5 minutes, the intensity of radiation received by the quartz test tube is 4 mW / cm at 365 nm 2 , to remove the mercury lamp 2 Light shield between the quartz test tube 4 , quartz test tube around mercur...

Embodiment 2

[0029] The irradiation device and irradiation conditions are the same as in Example 1, except that 2,3-butanedione, 2,5-hexanedione and H 2 o 2 The concentration is 0.5mM, into the quartz test tube 1-a, 1-b 1 mM 1,4-cyclohexanedione and 1,4-benzoquinone (also known as cyclohexa-2,5-diene-2,4-dione) were added to the 1-a, 1-b The absorbance of the solution in 484nm did not decrease significantly.

[0030] This example shows that not all diketone compounds can promote dye decolorization, that is, the small molecule diketone involved in this patent has certain structural characteristics.

Embodiment 3

[0032] The irradiation device and irradiation conditions are the same as in Example 1, except that 2,3-butanedione, 2,5-hexanedione and H 2 o 2 The concentration is 0.5mM, into the quartz test tube 1-a , 1-b and 1-c Add 0.5 mM ethanol to the quartz test tube 1-a and 1-b（ UV / diketone system ） The decolorization rate of the solution in the quartz test tube is constant. 1-c （ UV / H 2 o 2 control group ） The decolorization rate of the solution in the solution was reduced by 32%.

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Abstract

The invention discloses a method utilizing small-molecule diketone to serve as optical active agent for oxidation treatment of dye waste water and belongs to the field of dye waste water treatment. The method comprises the steps: filtering the dye-containing waste water to remove suspended matter; adding a small-molecule diketone compound to the dye-containing water body, and evenly mixing; and placing the dye-containing water body under an ultraviolet source to perform irradiation until dyes are decolorized. The method initially determines the structural characteristics of diketone capable of serving as the dye-decolorizing optical active agent: the molecular configuration is in a chain shape, and molecules are small. The dye-decolorizing method based on diketone is based on a reaction induced by ultraviolet light, can achieve efficient decoloration of various dyes, and has remarkably higher decoloration efficiency than a traditional UV / H2O2 method. Besides, the decoloration efficiency is not subjected to influence of coexistent alcohol in the water body, simultaneously the acid environment is favorable for promoting the reaction, and accordingly the method has more obvious advantages in the acid water body. The method has an autoacceleration performance in degrading the dyes, and the degradation speed is improved along with proceeding of the reaction.

Description

technical field [0001] The invention relates to a method for treating dye wastewater, in particular to a method for oxidatively treating dye wastewater by using small molecule diketone as a photoactive agent. Background technique [0002] Printing and dyeing wastewater accounts for a relatively large proportion of industrial wastewater in my country. Printing and dyeing wastewater has the characteristics of high organic content, complex composition, deep color, large water quality changes, high chemical oxygen demand and biochemical oxygen demand, and belongs to difficult-to-treat industrial wastewater. Many dyes (such as methyl orange, Congo red, and rhodamine B, etc.) are carcinogenic. Even if the concentration of dyes in the wastewater is very low, the light transmittance of the water body will decrease after being discharged into the water body, thus causing adverse effects on the aquatic ecosystem and the natural landscape of the water body. Therefore, with the increa...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/72C02F103/30
Inventor 张淑娟刘犀通王梦姝潘丙才吕路张炜铭
Owner NANJING UNIV
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