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Activated carbon-cobalt ferrite composition material, preparation method thereof and application to photocatalytic denitrification

A composite material, cobalt ferrite technology, applied in the field of photocatalysis, can solve the problems of high investment, high cost, lack of selectivity in photocatalytic degradation of ammonia nitrogen, etc., and achieves the effects of cheap and easily available raw materials, simple preparation method, and easily controllable conditions.

Active Publication Date: 2017-01-04
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

However, under the condition of high ammonia nitrogen and heavy pollution, because bacteria are very sensitive to climate, temperature, organic matter, dissolved oxygen and other factors, the cost of this method is high, and the investment in management and maintenance is high, so it is necessary to develop a new denitrification process
[0003] With the development of science and technology, researchers explore the use of semiconductor materials (mainly TiO 2 ) as a photocatalyst to degrade ammonia nitrogen, but these research works have made positive attempts to develop solar energy to purify the environment, but the photocatalytic degradation of ammonia nitrogen lacks selectivity, and TiO 2 Only the ultraviolet light in solar energy can be used, and its visible light cannot be used, so the utilization rate of solar energy is not high

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  • Activated carbon-cobalt ferrite composition material, preparation method thereof and application to photocatalytic denitrification
  • Activated carbon-cobalt ferrite composition material, preparation method thereof and application to photocatalytic denitrification
  • Activated carbon-cobalt ferrite composition material, preparation method thereof and application to photocatalytic denitrification

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[0027] The embodiment of the present invention also provides the preparation method of the activated carbon-cobalt ferrite composite material, which includes: dissolving soluble cobalt salt, soluble iron salt and activated carbon in a solvent and mixing them evenly, then adjusting the obtained mixed solution to be alkaline, and then dissolving The mixed solution is reacted at 150-200° C. for 6-10 hours to prepare the activated carbon-cobalt ferrite composite material.

[0028] Further, the molar ratio of the soluble cobalt salt to the soluble iron salt is 1:1-3.

[0029] More preferably, the soluble cobalt salt includes CoCl 2 ·6H 2 O, but not limited to.

[0030] More preferably, described soluble iron salt comprises Fe(NO 3 ) 3 9H 2 O, but not limited to.

[0031] More preferably, the alkaline solution includes NaOH solution, but not limited thereto.

[0032] Further, the mixed solution is reacted at a temperature of 180-200°C for 8-10 hours, then washed with deionize...

Embodiment 1

[0035] Cobalt ferrite (CoFe 2 o 4 ) synthesis: Accurately weigh CoCl at a molar ratio of 1:2 2 ·6H 2 O (1.1897g, 0.005mol), FeCl 3 9H 2 O (2.703g, 0.01mol) was dissolved in 10ml of deionized water, and NaOH (1.9200g, 0.048mol) was accurately weighed and dissolved in 10ml of deionized water. NaOH was slowly added dropwise into the mixed solution under the condition of magnetic stirring, and then the remaining NaOH in the beaker was washed with deionized water and added to the mixed solution. Continue to stir for 20 minutes to make it evenly mixed. At this time, the total volume of the solution is about 50ml. Then add the mixed solution into a 100ml hydrothermal reaction kettle, rinse the residual liquid in the beaker with deionized water, and add it to the reaction kettle, control the total volume of the reaction kettle to about 60ml, and then place the reaction kettle at 180°C Under the conditions of reaction for 8 hours, after cooling, take it out and let it stand, wash...

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Abstract

The invention discloses an activated carbon-cobalt ferrite composition material, a preparation method thereof and application to photocatalytic denitrification. The activated carbon-cobalt ferrite composition material comprises activated carbon and cobalt ferrite, wherein cobalt ferrite is of a spinel type structure and has a Fd3m space group structure. According to the activated carbon-cobalt ferrite composition material, activated carbon can adsorb ammonia nitrogen in water by means of adsorption and can form coordination bonds with ammonia nitrogen through an empty rail of transition metal to achieve double-effect adsorption of ammonia nitrogen in water, accordingly ammonia nitrogen is selectively subjected to photocatalytic degradation on the basis of ammonia nitrogen enrichment, and intelligent photocatalytic denitrification of contaminated water is achieved. The preparation method of the activated carbon-cobalt ferrite composition material is simple, conditions are easy to control, and raw materials are low in price and easy to obtain.

Description

technical field [0001] The invention relates to a composite material, in particular to an active carbon-cobalt ferrite composite material and its application in selective photocatalytic denitrification, belonging to the technical field of photocatalysis. Background technique [0002] The Taihu Lake cyanobacteria pollution incident in 2007 has aroused national attention to ammonia nitrogen pollution. Ammonia nitrogen treatment methods are divided into biological, physical and chemical methods. At present, low-concentration ammonia nitrogen (<100mg / L) can be denitrified through the nitrification-denitrification process. Nitrification is divided into ammonia oxidation and nitrous acid oxidation. The formed nitrate is denitrified into gas and discharged to achieve the denitrification effect. However, under the condition of high ammonia nitrogen and heavy pollution, because bacteria are very sensitive to climate, temperature, organic matter, dissolved oxygen and other factors,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F1/28C02F1/30B01J20/20C02F101/16
CPCB01J20/20B01J23/005B01J23/75C02F1/281C02F1/283C02F1/30C02F1/725C02F2101/16C02F2305/10
Inventor 刘守清周晶周洋
Owner SUZHOU UNIV OF SCI & TECH
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