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Application of iron cobalt double-metal oxyhydroxide to water treatment

A metal hydroxyl and oxide technology, which is applied in the direction of oxidizing water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of single species, and increase the generation rate, quantity, and particle size distribution Uniform, uniform and dense particles

Inactive Publication Date: 2017-05-10
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the types of such catalysts are relatively single, and there are only extensive research and reports on single metal oxyhydroxides.

Method used

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  • Application of iron cobalt double-metal oxyhydroxide to water treatment
  • Application of iron cobalt double-metal oxyhydroxide to water treatment
  • Application of iron cobalt double-metal oxyhydroxide to water treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare 200mL 0.2655mol / L Fe(NO 3 ) 3 And 0.0345mol / L Co(NO 3 ) 2 The iron-cobalt salt aqueous solution is prepared 1mol / L NaOH solution.

[0033] Under the condition of magnetic stirring, the NaOH solution prepared above was added dropwise to the iron-cobalt salt aqueous solution prepared above to uniformly mix and precipitate. After complete precipitation, adjust the pH to 11, let it stand for 1.5h, and place it in an incubator for 48h activation at a temperature of 60℃. After standing still, the supernatant was removed, and the obtained precipitate was washed with deionized water until the pH was close to neutral and no longer changed. The precipitate was dried at 60°C to obtain Fe-CoOOH bimetallic oxyhydroxide (Fe-CoOOH). ).

[0034] The obtained iron and cobalt bimetal oxyhydroxide is characterized by XRD, such as figure 1 It shows that the prepared iron-cobalt bimetallic oxyhydroxide particles are an amorphous structure compound, not a simple mixture of iron oxyhydrox...

Embodiment 2

[0056] Prepare 200mL 0.2655mol / L Fe(NO 3 ) 3 And 0.0345mol / L Co(NO 3 ) 2 The iron-cobalt salt aqueous solution is prepared 1mol / L NaOH solution.

[0057] Under the condition of magnetic stirring, the NaOH solution prepared above is added dropwise to the iron-cobalt salt aqueous solution prepared above to uniformly mix and precipitate. After complete precipitation, adjust the pH to 10, let it stand for 2 hours, and place it in an incubator for 48 hours to activate, and the activation temperature is 60°C. After standing still, the supernatant was removed, the obtained precipitate was washed with deionized water until the pH was close to neutral and no longer changed, and the precipitate was dried at 70°C to obtain Fe-CoOOH bimetallic oxyhydroxide (Fe-CoOOH). ).

Embodiment 3

[0059] Prepare 200mL 0.2655mol / L Fe(NO 3 ) 3 And 0.0345mol / L Co(NO 3 ) 2 The iron-cobalt salt aqueous solution is prepared 1mol / L NaOH solution.

[0060] Under the condition of magnetic stirring, the NaOH solution prepared above was added dropwise to the iron-cobalt salt aqueous solution prepared above to uniformly mix and precipitate. After complete precipitation, adjust the pH to 13, let it stand for 1 hour, and place it in an incubator for activation for 38 hours at a temperature of 60°C. After standing still, the supernatant was removed, the obtained precipitate was washed with deionized water until the pH was close to neutral and no longer changed, and the precipitate was dried at 50°C to obtain Fe-CoOOH bimetallic oxyhydroxide (Fe-CoOOH). ).

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Abstract

The invention discloses application of iron cobalt double-metal oxyhydroxide to water treatment. An iron-cobalt salt aqueous solution and a strong alkaline solution with certain volume concentration and certain proportion are prepared, the iron and cobalt mixed salt solution is in a dynamic mixing state by a magnetic stirrer, and the strong alkaline solution is added into the iron and cobalt mixed salt solution dropwise to be mixed uniformly and precipitate by stirring continuously. After precipitation is conducted completely, the strong alkaline solution is added dropwise and continuously, the pH value of suspension liquid is adjusted to be larger than or equal to 10 (pH control in the preparation process has great influence on granularity production and catalytic activity of a catalyst), and the liquid stands for 1 to 2 hours and then is put into a heat-insulating box to activate for a certain time. After activating treatment, the activated precipitate is washed with deionized water until the pH value is constant and then is dried to obtain the iron cobalt double-metal oxyhydroxide. The prepared iron cobalt double-metal oxyhydroxide can further improve the capability of removing organic pollutants from water by ozone.

Description

Technical field [0001] The invention relates to the application of iron-cobalt bimetal oxyhydroxide in water treatment. Background technique [0002] Ozonation technology uses ozone as an oxidant. Through dissolution in water, ozone molecules or more oxidizing free radicals react with complex organics in the water to degrade organic macromolecules into small molecules or open cyclic molecules. And further its oxidative degradation process. Ozone water treatment technology has a good effect on organic matter treatment and less secondary pollution, so ozonation technology has been a research hotspot in the field of water treatment in recent years. However, when a single ozonation technology is used, the utilization rate of ozone is very low due to the influence of ozone oxidation capacity and mass transfer efficiency, so the degradation efficiency of organic pollutants is also relatively low. Catalytic ozonation technology is an advanced oxidation technology that has attracted mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C02F1/72C02F1/78
CPCB01J23/75C02F1/725C02F1/78
Inventor 徐贞贞谢美玲贲岳王晓凤鲁成秀
Owner SHANDONG NORMAL UNIV