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Magnetic iron-based composite catalyst and preparation method thereof

A catalyst and composite technology, applied in the field of magnetic iron-based composite catalyst advanced oxidation technology to treat printing and dyeing wastewater, can solve the problems of low iron leaching rate, difficulty, non-recyclable catalyst, etc., and achieve high surface activity, simple method, and reduced The effect of the possibility of secondary pollution

Inactive Publication Date: 2017-10-20
JIANGSU UNIV OF TECH
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Problems solved by technology

[0007] In view of the above-mentioned problems existing in the prior art, the object of the present invention is to provide a kind of magnetic iron-based composite catalyst, its preparation method and application, the materials required by the present invention are all easy to obtain, the synthesis process is simple, and the synthesized magnetic nanocomposite The physical catalyst has the advantages of good catalytic effect, environmental friendliness, no need to adjust pH, low iron leaching rate, and recyclable use. Disadvantages of difficulty in recycling

Method used

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  • Magnetic iron-based composite catalyst and preparation method thereof

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Effect test

Embodiment 1

[0033] Embodiment 1: Magnetic iron-based Fe 3 o 4 / MnO 2 Preparation of composite catalyst

[0034] (1) 2.224g FeSO 4 ·7H 2 O and 1.0 g of polyethylene glycol 4000 were dissolved in 100 mL of deionized water, placed in a three-necked flask and heated to 70 ° C in a water bath, and 100 mL of 0.2 mol / L NaOH solution was added under electric stirring, and the reaction was maintained at 70 ° C for 5 minutes, and then continued Slowly add 12mL 0.2mol / L KMnO with stirring 4 solution, the color of the solution changed from dark green to dark brown at this time, and the reaction was maintained at 70° C. for 2 hours. After the reaction was completed, the solid powder was separated by an external magnetic field, and the obtained solid powder was washed three times with secondary water and ethanol by decantation, and the obtained product was vacuum-dried at 60°C for 12 hours, and finally the product was taken out and ground in a mortar, and weighed Measure the quality of the produc...

Embodiment 2

[0035] Example 2: Magnetic Fe-based Fe 3 o 4 / MnO 2 Preparation of composite catalyst

[0036] (1) 2.780g FeSO 4 ·7H 2 O and 1.0g of polyethylene glycol 4000 were dissolved in 100mL of deionized water, placed in a three-necked flask and heated to 75°C in a water bath, and 120mL of 0.2mol / L NaOH solution was added under electric stirring, and the reaction was maintained at 75°C for 5 minutes, and then continued Slowly add 14mL 0.2mol / L KMnO with stirring 4 solution, the color of the solution changed from dark green to dark brown at this time, and the reaction was maintained at 75° C. for 2 hours. After the reaction was completed, the solid powder was separated by an external magnetic field, and the obtained solid powder was washed three times with secondary water and ethanol by decantation, and the obtained product was vacuum-dried at 60°C for 12 hours, and finally the product was taken out and ground in a mortar, and weighed Measure the quality of the product and put it ...

Embodiment 3

[0037] Embodiment 3: a kind of magnetic iron-based Fe in this embodiment 3 o 4 / MnO 2 The method that composite catalyst activates persulfate treatment printing and dyeing wastewater comprises the following steps:

[0038] A kind of magnetic iron-based Fe prepared with embodiment 1 3 o 4 / MnO 2 Composite catalyst activated persulfate treatment of methylene blue in simulated dye wastewater. Take by weighing a certain amount (0.15g) of the catalyst prepared by embodiment 1, join in the simulated wastewater containing methylene blue, the simulated wastewater pH is 7.5, the volume is 250mL, the methylene blue concentration is 30mg / L, and the catalyst concentration is 0.6g / L, shake After 2 minutes, add a certain amount of potassium hydrogen persulfate (1.25g) to make the concentration of potassium hydrogen persulfate in the solution 5g / L, and place it in a constant temperature water bath oscillator at 25°C for oscillating reaction for 20 minutes. After the reaction, with the h...

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Abstract

The invention relates to a preparation method of a magnetic iron-based Fe3O4 / MnO2 composite catalyst and a method for treating wastewater by taking the magnetic iron-based Fe3O4 / MnO2 composite catalyst as a high-grade oxidation technology catalyst. The magnetic iron-based catalyst is prepared from a nano manganese dioxide material cladded on magnetic ferroferric oxide nanoparticles; and the magnetic iron-based composite catalyst is synthesized by taking ferrous sulfate and potassium permanganate as raw materials through a one-step reaction at room temperature. Raw materials used by the preparation method are cheap and easy to obtain; a synthesis process is simple and environmentally friendly; a treatment effect on dyestuff wastewater is good; and the catalyst is easily separated and recycled from water under an external magnetic field and has a certain application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and relates to a method for treating printing and dyeing wastewater with a magnetic iron-based composite catalyst advanced oxidation technology. Background technique [0002] Advanced oxidation processes (AOPs) is a new technology developed in the 1990s for the treatment of refractory organic wastewater. Its mechanism is to combine strong oxidants with catalysts, ultraviolet light, electrochemistry, ultrasonic radiation and other technologies to generate highly oxidizing free radicals (such as HO ), and then through the addition between free radicals and organic pollutants, Substitution, electron transfer, chemical bond breaking and other reactions make the macromolecular refractory organic matter in the water body oxidized into low-toxic or non-toxic small molecular substances, and even directly mineralized into carbon dioxide and water. Compared with other traditional water treatm...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/72
CPCC02F1/725B01J23/8892C02F2101/308B01J35/33
Inventor 连宁刘琦琦智华刘丹张雅珩
Owner JIANGSU UNIV OF TECH
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