Method for microwave induced catalytic degradation of triphenyl methane dye waste water

A technology of triphenylmethane and induced catalysis, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of difficult light penetration, affecting degradation effect, and low photon quantum efficiency, so as to overcome the problem of light quantum The effect of low efficiency, overcoming low light utilization rate, and simple experimental equipment

Inactive Publication Date: 2009-02-25
NANJING UNIV
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Problems solved by technology

However, photocatalytic technology generally has the problems of low light utilization rate and low photon quantum efficiency: First, photocatalysis mostly uses ultraviolet light and simulated natural light generated by high-pressure mercury lamps or electrodeless lamps as light sources.
This kind of lamp (especially the electrodeless lamp) has its own unstable factors due to the problem of production technology, which leads to the instability of the light source and affects the degradation effect, while the utilization rate of natural light is lower
Secondly, for the treatment of high-concentration dye wastewater, it is difficult for the light used to penetrate the wastewater to achieve the expected removal effect, which also restricts the application of this technology

Method used

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  • Method for microwave induced catalytic degradation of triphenyl methane dye waste water
  • Method for microwave induced catalytic degradation of triphenyl methane dye waste water
  • Method for microwave induced catalytic degradation of triphenyl methane dye waste water

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Prepare 0.8M Ni(NO 3 ) 2 ·6H 2 O solution, 1.6M NaOH solution and 12wt% NaClO solution are ready for use. First take 50mL Ni(NO 3 ) 2 ·6H 2 O solution was added dropwise to 50mL NaOH solution (molar ratio 1:2) to obtain Ni(OH) 2 . Subsequently, 100 mL of NaClO solution was added dropwise to the above-prepared solution with stirring, and the solution gradually changed from green to black precipitate. The above reaction was carried out in a water bath at a temperature of 70° C., and then the above reaction solution was placed in an ultrasonic device for 15 minutes of sonication. The resulting precipitate was suction-filtered and washed several times with deionized water, then collected and transferred to a muffle furnace for drying at 110°C for 20 hours, and finally calcined at 300°C for 2 hours. The resulting black solid is the NiO catalyst, which is stored in a desiccator. Characterize the catalyst. After the reaction is finished, the catalyst is collected, an...

Embodiment 2

[0028] Prepare a 100mg / L malachite green aqueous solution to simulate dye wastewater, and measure 50mL of the aqueous solution into a reaction bottle. The reaction was then placed in a microwave oven. 1 is the condenser tube, 2

[0029] Modify the microwave power to 600w household microwave oven, such as figure 1As shown, wherein the aeration pipe 1, the condenser pipe 2, the aluminum casing 3, the flat-bottomed flask 4, the microwave generator 5, the connecting pipe 6, and the microwave cavity 7. Adjust the microwave power, connect the condensed water, and continue to aerate the reaction liquid, rotate the microwave time gear, the microwave oven will start to work, start timing at this time, and the reaction time is about 5 minutes. After the reaction, cool and centrifuge to collect the reaction solution. The following two reaction systems were set up to measure the change of malachite green concentration with the reaction time.

[0030] 1) The reaction is only carried ou...

Embodiment 3

[0034] Prepare a 10mg / L malachite green aqueous solution to simulate dye wastewater, and measure 50mL of the dye solution into a reaction bottle. Weigh 20 mg of NiO (0.4 mg / L) catalyst into the above reaction solution, and then place it in a microwave oven for reaction. Adjust the microwave power, connect the condensed water, and continuously aerate the reaction liquid, rotate the microwave time gear, the microwave oven starts to work, and the timer starts at this time. After the reaction, cool and centrifuge to collect the reaction solution. The change of malachite green concentration with the reaction time was measured. The experimental results showed that the concentration of malachite green decreased by 99.7% within 2 minutes, and the removal rate of TOC reached 82.4%.

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Abstract

The invention discloses a method for degrading triphenylmethane dye wastewater by the method of microwave induced catalysis. The microwave induced catalysis method is adopted, and nano NiO is taken as a catalyst to degrade triphenylmethane dyes in a microwave device. The dosage of the nano NiO is 0.4-1.0g / L, and the initial concentration of the triphenylmethane dyes is 30-100mg / L. A reaction solution is aerated for 30 minutes at first, put into the microwave device for reaction, and kept aerated in the course of the reaction. The method adopts a microwave induced catalysis system, and catalytic reaction is carried out without any light source, which overcomes the defects of low light utilization rate and low light quantum efficiency of the photocatalysis technology. The experimental device adopted by the method is simple and convenient to be operated, and the reaction can be carried out at normal temperature and normal pressure, thus achieving the effects of saving energy and lowering energy consumption. By adopting the method, typical triphenylmethane dyes which are difficult to be biodegraded can be effectively degraded, which causes no secondary pollution, and has high TOC removing efficiency, and the method is characterized by high speed and high efficiency.

Description

technical field [0001] The invention relates to a treatment method for triphenylmethane dye wastewater, in particular to a method for microwave-induced catalytic degradation of triphenylmethane dye wastewater. Background technique [0002] With the development of dyestuff and printing and dyeing industry, its production wastewater has become one of the most important sources of water pollution, and has posed an increasingly serious threat to the environment. According to relevant reports, dyes accounting for 1-10% of the world's total dye production are lost in the printing and dyeing process and discharged as wastewater, which is the main source of water body color pollution and eutrophication. [0003] Triphenylmethane dye is a kind of polybenzene ring compound, the main feature of its structure is that there are three benzene rings connected around the central carbon atom, and one of the benzene rings is connected with the carbon atom by a double bond. This type of dye i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/30C02F1/58C02F101/34
Inventor 杨绍贵何欢孙成鞠勇明刘振宇王永花郭会琴
Owner NANJING UNIV
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