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Double-effect optical Fenton denitrification method of manganese ferrite or carbon composite material of manganese ferrite

A technology of carbon composite materials and manganese ferrite, applied in the field of environmental science, can solve the problems of high cost, lower denitrification efficiency, and inability to make full use of solar visible light, and achieve the effect of low cost and improved photocatalytic efficiency

Active Publication Date: 2015-03-25
苏州尼普环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods of denitrification mainly include physical stripping method, physical adsorption method, biodegradation method, chemical precipitation method, electrochemical oxidation method, breakpoint chlorine addition method, etc. These methods are either high in cost or low in efficiency, and breakpoint chlorine addition method It will also produce residual chlorine, so there is an urgent need for a new technology for denitrification with high efficiency, low cost, and no secondary pollution.
[0004] The utility model patent whose notification number is CN201136803U discloses a microporous aeration TiO 2 / Fe 3 o 4 Photocatalytic sewage treatment device, but it can only work under the condition of ultraviolet light, and cannot make full use of the visible light in solar energy
The patent with the publication number CN 1830830A discloses a method for photocatalytic denitrification, but in this method, ferrous ions must be added to improve the denitrification efficiency, and ferrous ions are prone to hydrolysis under alkaline conditions to reduce the denitrification efficiency. Nitrogen efficiency, limited use of sunlight
Moreover, the above two photocatalysts are single metals for photocatalysis, and their catalytic efficiency is also very limited.

Method used

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Effect test

Embodiment 1

[0035] The synthesis of embodiment 1 manganese ferrite: weigh MnCl in molar ratio 1:2 2 .4H 2 O (0.01mol, 1.9790g), FeCl 3 .6H 2 O (0.02mol, 5.4058g) was dissolved in 15ml of ultrapure water respectively, and stirred for 10min under magnetic stirring to make it evenly mixed. Another accurately weighed NaOH (0.08mol, 3.2000g) was dissolved in 15ml of water. Under magnetic stirring, sodium hydroxide was added dropwise to the mixed solution of nickel sulfate hexahydrate and ferric chloride hexahydrate, and then the sodium hydroxide in the beaker was washed with ultrapure water and added to the mixed solution. Stir for 20 minutes to make it evenly mixed, and the total volume is about 60ml. Then add the mixed solution into two 50ml hydrothermal reaction kettles, place it at 180°C for 10 hours, after cooling, take it out and separate it in a magnetic field, wash it 3 times (washing with ultrapure water), and dry it at 200°C 4h, the sample MnFe is obtained 2 o 4 .

Embodiment 2

[0036] Example 2 Synthesis of activated carbon hybrid manganese ferrite catalyst: Weigh MnCl at a molar ratio of 1:2 2 .4H 2 O (0.01mol, 1.9790g), FeCl 3 .6H 2O (0.02mol, 5.4058g) was dissolved in 15ml of ultrapure water respectively, after mixing, 0.2344g of activated carbon was added, ultrasonicated for 30min, and then stirred by magnetic force for 10min to make it evenly mixed. Another accurately weighed (0.08mol, 3.20g) sodium hydroxide was dissolved in 15ml of water. Add sodium hydroxide dropwise to the mixed suspension under magnetic stirring, then wash the sodium hydroxide in the beaker with ultrapure water and add it to the mixed solution. Stir for 30 minutes to make it evenly mixed, and the total volume is about 60ml. Then add the mixed solution into a 100ml reaction kettle, place it at 180°C for 10 hours, cool it, take it out and separate it in a magnetic field, wash it 3 times (ultrapure water washing), and dry it at 200°C for 4 hours to get the activated carbon...

Embodiment 3

[0037] The synthesis of embodiment 3 graphene hybrid manganese ferrite catalysts:

[0038] The synthesis method of graphene oxide (GO): accurately weigh 2.0g graphite, 1.0g NaNO 3 In a 200ml beaker, add 50ml concentrated H 2 SO 4 Then add 6.0g KMnO 4 React for 2h under the condition that the temperature is lower than 20°C. Then warm up to 35 o C, add a certain amount of deionized water to the reaction system after 35 minutes of reaction, keep stirring for 20 minutes, and then use 5% H 2 o 2 Reduce the remaining oxidant until the solution turns bright yellow, filter while hot, and wash with 5% HCl and deionized water until there is no SO in the solution 4 2- , fully dried in a vacuum oven at 60°C to prepare a graphite oxide sample for future use.

[0039] Preparation of graphene hybrid manganese ferrite: Accurately weigh graphite oxide with 4% of the theoretical mass of manganese ferrite and ultrasonically disperse it in 10ml of water for later use. Weigh MnCl at a mo...

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Abstract

The invention discloses a double-effect optical Fenton denitrification method of manganese ferrite or a carbon composite material of the manganese ferrite. The method comprises the following steps: at least under irradiation of ultraviolet light or visible light, preferably under the irradiation of the sunshine, degrading ammonia nitrogen in water by taking manganese ferrite and / or a manganese ferrite-carbon composite material as an optical Fenton catalyst, wherein the manganese ferrite-carbon composite material mainly comprises manganese ferrite, graphene and / or active carbon; and the manganese ferrite is distributed on a graphene interface or coated by the active carbon. By utilizing catalytic circulation of Mn (III) and Mn (II) and the catalytic circulation of Fe (III) and Fe (II), the method disclosed by the invention can be used for oxidizing the ammonia nitrogen into nitrogen gas by one step under the irradiation of various wavelengths so as to realize rapid and high-efficiency degradation of the ammonia nitrogen in water; and moreover, the adopted optical Fenton catalytic material can be separated from water by an externally applied magnetic field and is recyclable, low in cost and beneficial for environmental protection.

Description

technical field [0001] The invention belongs to the field of environmental science, and in particular relates to a method for degrading ammonia nitrogen by bimetallic photo-Fenton based on manganese ferrite or its carbon-based composite material. Background technique [0002] Ammonia nitrogen in the prior art refers to free ammonia (NH 3 ) and ammonium ions (NH 4 + ) in the form of nitrogen. Excessive ammonia nitrogen in water will lead to eutrophication. It is one of the main oxygen-consuming pollutants in water. It is poisonous to fish and some aquatic organisms. The primary emission standard is 15mg / L. [0003] At present, the methods of denitrification mainly include physical stripping method, physical adsorption method, biodegradation method, chemical precipitation method, electrochemical oxidation method, breakpoint chlorine addition method, etc. These methods are either high in cost or low in efficiency, and breakpoint chlorine addition method It will also produce...

Claims

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Application Information

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IPC IPC(8): C02F1/30C02F1/32C02F1/72B01J23/889
CPCY02W10/37C02F1/30B01J23/8892C02F1/32C02F1/488C02F1/72C02F2305/026C02F2305/10
Inventor 刘守清肖波
Owner 苏州尼普环境科技有限公司
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