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Preparation method and application of magnetic nickel ferrite photocatalysis material

A photocatalytic material, nickel ferrite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve water pollution, wastewater treatment and recycling difficulties , ammonia nitrogen pollution and other problems, to achieve the effect of efficient degradation and simple and easy treatment methods

Active Publication Date: 2013-03-27
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

Excessive ammonia nitrogen will also bring difficulties to the treatment and recycling of wastewater
[0003] At present, the degradation methods of ammonia nitrogen mainly include physical stripping method, biodegradation method, chemical precipitation method, electrochemical oxidation method, break point chlorine addition method and activated carbon adsorption method, etc., although these methods have reduced the ammonia nitrogen in water to a certain extent. content, but it cannot fundamentally solve the main problem of ammonia nitrogen pollution, the main problem of water pollution in my country.

Method used

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preparation example Construction

[0023] As one aspect of the present invention, the present invention provides a kind of preparation method of magnetic nickel ferrite photocatalytic material, and its technical scheme comprises:

[0024] Use soluble iron salts such as ferric chloride and / or ferric nitrate and soluble nickel salts such as nickel sulfate as raw materials, dissolve them in water according to the molar ratio of Fe:Ni=2:1 and mix them evenly, then add NaOH and other strong bases, and continue After stirring for more than 1 hour, transfer it to an environment with a temperature of 180°C and heat it in a sealed environment for more than 10 hours, then separate the solids in a magnetic field, wash it for more than 3 times, and then dry it in the temperature range of 200-450°C for more than 4 hours. Obtain the target product with a particle size of about 10nm, that is, magnetic NiFe 2 o 4 Nanophoto-Fenton catalysts.

[0025] Further, the preparation method of the magnetic nickel ferrite photocatalyti...

Embodiment 1

[0031] 1. Preparation of photo-Fenton catalyst: NiFe was prepared by the above method 2 o 4 Photo-Fenton catalyst 0.2000g.

[0032] 2. Preparation of ammonia nitrogen solution: Weigh ammonium sulfate to prepare an aqueous solution with an ammonia nitrogen content of 500 mg / L to obtain the mother liquor.

[0033] 3. Photocatalytic degradation: Add 10mL of the above ammonia nitrogen solution to a 50ml beaker, add 5mL of hydrogen peroxide solution with a concentration of 0.10mol / L, add Na 2 CO 3 -NaHCO 3 Buffer solution, make the volume of total solution be 50 milliliters, the concentration of ammonia nitrogen is 100mg / L. Then accurately weigh 0.2000g magnetic NiFe 2 o 4 The photo-Fenton catalyst was added to the beaker, and placed under a 300W ultraviolet-visible light source for photocatalytic reaction. The distance between the light source and the reaction liquid surface was 10-20cm. After 3 hours, the degradation rate of ammonia nitrogen reached over 92%.

Embodiment 2

[0035] 1. Preparation of photo-Fenton catalyst: Prepare activated carbon / NiFe by the above method 2 o 4 Photo-Fenton catalyst 0.2000g.

[0036] 2. Preparation of ammonia nitrogen solution: take ammonium sulfate to prepare an aqueous solution with an ammonia nitrogen content of 500 mg / L to obtain the mother liquor.

[0037] 3. Photocatalytic degradation: Add 8mL of the above ammonia nitrogen solution to a 50ml beaker, add 5mL of hydrogen peroxide solution with a concentration of 0.10mol / L, add Na 2 CO 3 -NaHCO 3 Buffer solution, make the volume of total solution be 50 milliliters, the concentration of ammonia nitrogen is 80mg / L. Then accurately weigh 0.2000g magnetic activated carbon / NiFe 2 o 4 The photo-Fenton catalyst is added into the beaker, and placed under visible light with a wavelength greater than 400nm for photocatalytic reaction, the distance between the light source and the reaction liquid surface is 10-20cm. After 10 hours, the degradation rate of ammonia ni...

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Abstract

The invention discloses a preparation method and application of a magnetic nickel ferrite photocatalysis material. The preparation method comprises the following steps of: uniformly mixing soluble iron salt and soluble nickel salt in water, and adding strong alkali into the water for stirring continuously; then heating a formed mixed reaction system at 180 DEG C for 10 hours in an airtight mode; then separating solid substances from a mixed reactant by a magnetic field, and washing the solid substances for multiple times; and finally drying the solid substances in an environment at 200-450 DEG C, thereby obtaining the target product. The magnetic nickel ferrite photocatalysis material has functions of photocatalytic degradation by ultraviolet light and visible light as well as magnetic separation, can be used for treating sewage, and especially can remove ammonia nitrogen in a polluted water body rapidly and effectively; the method is simple, convenient and feasible; and the catalyst can be easily separated out through an applied magnetic field, can be recycled and is low in cost.

Description

technical field [0001] The invention relates to a preparation method and application of a heterogeneous photo-Fenton catalyst, in particular to a preparation method of a magnetic nickel ferrite photocatalytic material and a method for using the catalytic material to catalytically degrade ammonia nitrogen in water under light. Background technique [0002] Ammonia nitrogen (eg, NH 4 + ) is one of the main factors causing water eutrophication. Ammonia nitrogen mainly comes from industrial production processes such as chemical industry, metallurgy, coking, leather tanning, and fertilizer, as well as human and animal excrement. In addition, the use of nitrogen fertilizers in agriculture will also increase the pollution of ammonia nitrogen. Ammonia nitrogen is also one of the main oxygen-consuming pollutants in water, which is toxic to fish and some aquatic organisms. Excessive ammonia nitrogen will also bring difficulties to the treatment and recycling of wastewater. [000...

Claims

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Application Information

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IPC IPC(8): B01J23/755C02F1/30C02F1/72C02F101/16
Inventor 刘守清肖波
Owner SUZHOU UNIV OF SCI & TECH
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