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Preparation of Fe3O4-MnO2 composite catalyst and method for removing organic dye in printing and dyeing wastewater by using Fe3O4-MnO2 composite catalyst

A technology for composite catalysts and printing and dyeing wastewater, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Low degradation rate, difficult to maintain catalytic effect and stability, etc., to achieve the effect of short time, low processing cost and simple operation

Inactive Publication Date: 2014-12-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to solve the problem that the organic dye degradation rate in the existing catalytic oxidation treatment of printing and dyeing wastewater is low, the catalyst is difficult to separate from solid and liquid, and it is difficult to reuse, or it is difficult to maintain high-efficiency catalytic effect and stability in the process of repeated use. while providing Fe 3 o 4 -MnO 2 Preparation of composite catalyst and method of using it to remove organic dyes in printing and dyeing wastewater

Method used

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  • Preparation of Fe3O4-MnO2 composite catalyst and method for removing organic dye in printing and dyeing wastewater by using Fe3O4-MnO2 composite catalyst
  • Preparation of Fe3O4-MnO2 composite catalyst and method for removing organic dye in printing and dyeing wastewater by using Fe3O4-MnO2 composite catalyst
  • Preparation of Fe3O4-MnO2 composite catalyst and method for removing organic dye in printing and dyeing wastewater by using Fe3O4-MnO2 composite catalyst

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specific Embodiment approach 1

[0013] Specific implementation mode one: this implementation mode is Fe 3 o 4 -MnO 2 The preparation method of composite catalyst is specifically completed in the following steps: FeSO 4 ·7H 2 O and polyvinylpyrrolidone were dissolved in water, and the obtained mixture was added to deionized water at a temperature of 90°C, and NaOH was added, stirred and reacted at a temperature of 90°C for 2 minutes, and a green-brown precipitate was formed, which was statically settled at a temperature of 90°C for 2 minutes , then add KMnO 4 , stirred and reacted at a temperature of 90°C for 1 min, and then separated and obtained a solid precipitate after static precipitation at a temperature of 90°C for 4 to 6 hours. The solid precipitate was washed three times with deionized water, then washed three times with absolute ethanol, and dried Fe 3 o 4 -MnO 2 Composite catalyst.

[0014] The FeSO described in this embodiment 4 ·7H 2 The mass ratio of the amount of O to polyvinylpyrroli...

specific Embodiment approach 2

[0023] Specific embodiment two: the difference between this embodiment and specific embodiment one is: adding KMnO 4 , the reaction was stirred at a temperature of 90° C. for 1 min, and then a solid precipitate was isolated after static precipitation at a temperature of 90° C. for 4 h. Others are the same as the first embodiment.

specific Embodiment approach 3

[0024] Specific implementation mode three: this embodiment mode utilizes Fe 3 o 4 -MnO 2 The method for removing organic dyes in printing and dyeing wastewater with a composite catalyst is specifically completed as follows: firstly adjust the pH value of the printing and dyeing wastewater containing organic dyes to 6.5 to 7.5, and then add potassium hydrogen persulfate and Fe 3 o 4 -MnO 2 Composite catalyst, stirring and reacting at room temperature for 15min to 35min, the utilization of Fe 3 o 4 -MnO 2 Composite catalyst removes organic dyestuff in printing and dyeing wastewater; Described potassium persulfate and Fe 3 o 4 -MnO 2 The mass ratio of the composite catalyst is (2~4):1; the Fe 3 o 4 -MnO 2 The mass ratio of the composite catalyst to the printing and dyeing wastewater containing the organic dye is (0.1-0.3) g:1L.

[0025]Advanced oxidation technology can mineralize and degrade refractory organic matter under normal temperature and pressure, which is a p...

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Abstract

The invention discloses preparation of a Fe3O4-MnO2 composite catalyst and a method for removing organic dye in printing and dyeing wastewater by using the Fe3O4-MnO2 composite catalyst, relating to a preparation method of a composite catalyst and a method for removing organic dye in printing and dyeing wastewater by using the composite catalyst, and aiming at solving the problems that when the printing and dyeing wastewater is treated by using a conventional catalytic oxidation method, the degradation rate of the organic dye is low, and the catalyst has difficulty in solid-liquid separation and reuse, or can hardly keep an efficient catalytic effect and stability during reuse. The preparation method is characterized in that the Fe3O4-MnO2 composite catalyst is prepared from FeSO4.7H2O, polyvinylpyrrolidone, water, deionized water, NaOH and KMnO4. The method for removing the organic dye in the printing and dyeing wastewater is characterized in that the organic dye is removed by using potassium monopersulfate triple salt and the Fe3O4-MnO2 composite catalyst.

Description

technical field [0001] The invention relates to a preparation method of a composite catalyst and a method for removing organic dyes in printing and dyeing wastewater by using the composite catalyst. Background technique [0002] With the development of the printing and dyeing industry, the number of organic synthetic dyes is increasing year by year. The use of various dyes and the discharge of organic dye wastewater have seriously polluted the natural water environment. Printing and dyeing wastewater is one of the largest sources of water pollution. The sustainable development of the ecological environment poses a serious threat. [0003] Organic dye wastewater generally has a large amount of wastewater, a large chroma (up to 5 million to 500,000), a wide distribution range, complex water quality components and large changes in water quality, among which the content of organic matter is large, most of which contain benzene, naphthalene, green onions, quinones, etc. Aromatic...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/72C02F101/30C02F103/30
Inventor 赵健慧崔福义赵志伟
Owner HARBIN INST OF TECH
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