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Activated carbon-zinc ferrite composite material, its preparation method and photocatalytic denitrification application

A composite material, zinc 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 achieve the effect of cheap and easy-to-obtain raw materials, simple preparation method, and efficient removal

Active Publication Date: 2019-05-07
苏州尼普环境科技有限公司
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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

Method used

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  • Activated carbon-zinc ferrite composite material, its preparation method and photocatalytic denitrification application
  • Activated carbon-zinc ferrite composite material, its preparation method and photocatalytic denitrification application
  • Activated carbon-zinc ferrite composite material, its preparation method and photocatalytic denitrification application

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preparation example Construction

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

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

[0029] More preferably, described soluble zinc salt comprises Zn(NO 3 ) 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 deionized water, ...

Embodiment 1

[0036] (1) Zinc ferrite (ZnFe 2 o 4 ) synthesis: accurately weigh Zn(NO 3 ) 2 ·6H 2 O(1.7850g,0.006mol), Fe(NO 3 ) 3 9H 2 O (4.8480g, 0.012mol) 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 still, wash it ...

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Abstract

The invention discloses an activated carbon and zinc ferrite composite material and a preparation method and photocatalytic denitrification application thereof. The activated carbon and zinc ferrite composite material comprises activated carbon and zinc ferrite, wherein zinc ferrite is of a spinel-type structure, and zinc ferrite has a Fd3m space group structure. According to the activated carbon and zinc ferrite composite material, activated carbon not only can adsorb ammonia nitrogen in a water body through an adsorption property of activated carbon itself, but also can form coordination bonds with ammonia nitrogen through unoccupied orbits of transition metals; therefore, double-effect adsorption on ammonia nitrogen in the water body is achieved, ammonia nitrogen is subjected to selectively photocatalytic degradation on the basis of ammonia nitrogen enrichment, and intelligent photocatalytic denitrification of a contaminated water body is achieved; in addition, the preparation method of the activated carbon and zinc ferrite composite material is simple, conditions are easy to control, and the 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 activated carbon-zinc 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 Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/72C02F1/30C02F1/28C02F101/16
CPCB01J20/024B01J20/20C02F1/28C02F1/283C02F1/30C02F1/725C02F2101/16C02F2305/10
Inventor 刘守清周晶周洋
Owner 苏州尼普环境科技有限公司