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Activated carbon-copper ferrite composite material, its preparation method and photocatalytic denitrification application
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A composite material, copper ferrite technology, applied in the field of photocatalysis, can solve the problems of high investment, high cost, and 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 high-efficiency removal
Active Publication Date: 2019-05-07
SUZHOU UNIV OF SCI & TECH
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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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[0026] The embodiment of the present invention also provides the preparation method of the activated carbon-copper ferrite composite material, which includes: dissolving soluble copper 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-copper ferrite composite material.
[0027] Further, the molar ratio of the soluble copper salt to the soluble iron salt is 1:1-3.
[0028] More preferably, described soluble copper salt comprises Cu(NO 3 ) 2 ·6H 2 O, but not limited to.
[0029] More preferably, described soluble iron salt comprises Fe(NO 3 ) 3 9H 2 O, but not limited to.
[0030] More preferably, the alkaline solution includes NaOH solution, but not limited thereto.
[0031] Further, the mixed solution is reacted at a temperature of 180-200°C for 8-10 hours, then washed ...
Embodiment 1
[0035] (1) copper ferrite (CuFe 2 o 4 ) synthesis: Accurately weigh Cu(NO 3 ) 2 ·6H 2 O(4.0400g,0.01mol), 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, wash it with ...
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Abstract
The invention discloses an activated carbon-copper ferrite composite material and a preparation method and application thereof to photocatalytic denitrification. The activated carbon-copper ferrite composite material comprises activated carbon and copper ferrite, wherein copper ferrite is of a spinel type structure and has an Fd3m space group structure. In the provided activated carbon-copper ferrite composite material, activated carbon can adsorb ammonia nitrogen in water by means of adsorbability, the activated carbon and ammonia nitrogen can form coordination bonds by means of unoccupied orbital of transition metal, accordingly double-effect adsorption of ammonia nitrogen in water is achieved, ammonia nitrogen is selectively subjected to photocatalysis and degradation on the basis of ammonia nitrogen enrichment, and intelligent photocatalytic denitrification of polluted water is achieved. Besides, the activated carbon-copper ferrite composite material is simple in preparation method, conditions are easy to control, 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-copper 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 facto...
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