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Porous magnesium manganate and preparation method and application thereof

A technology of porous magnesium manganate and magnesium nitrate is applied in the field of porous magnesium manganate and its preparation to achieve the effects of improving water quality and promoting sustainable development

Inactive Publication Date: 2018-09-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later, the Sol-gel method of low temperature and normal pressure was developed, that is, magnesium acetate and manganese acetate were used as precursors, ethanol was used as solvent, and oxalic acid was used as complexing agent for preparation. Although this preparation method avoided the harsh preparation conditions of high temperature and high pressure, , using ethanol solvent, therefore, it is of great significance to seek a cheaper and greener preparation method of magnesium manganate

Method used

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  • Porous magnesium manganate and preparation method and application thereof
  • Porous magnesium manganate and preparation method and application thereof
  • Porous magnesium manganate and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A kind of porous magnesium manganate, the preparation method of described porous magnesium manganate is as follows:

[0031] (1) According to the raw material molar ratio of magnesium nitrate: manganese nitrate: citric acid = 1:1:2, weigh 1073.7mg (3mmol) manganese nitrate solution with a mass fraction of 50%, 769.2mg (3mmol) magnesium nitrate hexahydrate, 1260.8 mg (6mmol) citric acid monohydrate, placed in a 100mL beaker. Add an appropriate amount of pure water to just enough to dissolve all the solids to form a uniform solution.

[0032] (2) Add 25% (w / w) ammonia water dropwise to the above solution, stir, and stop adding ammonia water when the pH value is adjusted to 5.0-6.0. Place the beaker in an 80°C water bath and stir for 2h, then transfer to 80°C o C oven for further drying.

[0033] (3) The dry gel is calcined in a muffle furnace, and after a calcination time of 2 hours at a calcination temperature of 450°C, it is cooled and ground to obtain a brown-black ...

Embodiment 2

[0036] A kind of porous magnesium manganate, the preparation method of described porous magnesium manganate is as follows:

[0037] (1) According to the molar ratio of raw materials magnesium nitrate: manganese nitrate: citric acid = 1.0: 1.05: 3, respectively weigh 1073.7mg (3mmol) manganese nitrate solution with a mass fraction of 50%, 807.7mg (3.15mmol) magnesium nitrate hexahydrate, 1891.2mg (9mmol) of citric acid monohydrate was placed in a 100mL beaker. Add an appropriate amount of pure water to just enough to dissolve all the solids to form a uniform solution.

[0038] (2) Add 25% (w / w) ammonia water dropwise to the above solution, stir, and stop adding ammonia water when the pH value is adjusted to 9.0-10.0. The beaker was stirred in a 60°C water bath for 6h, and then transferred to an 80°C oven for further drying.

[0039] (3) The xerogel is calcined in a muffle furnace. After a calcination time of 1 h at a calcination temperature of 550° C., it is cooled and ground...

Embodiment 3

[0041] A kind of porous magnesium manganate, the preparation method of described porous magnesium manganate is as follows:

[0042] (1) According to the molar ratio of raw materials, magnesium nitrate: manganese nitrate: or ethylenediaminetetraacetic acid = 1.05: 1: 0.5, respectively weigh 1127.4mg (3.15mmol) manganese nitrate solution with a mass fraction of 50%, 769.2mg (3mmol) six Magnesium nitrate hydrate and 438.4 mg (1.5 mmol) citric acid monohydrate were placed in a 100 mL beaker. Add an appropriate amount of pure water to just enough to dissolve all the solids to form a uniform solution.

[0043] (2) Add 25% (w / w) ammonia water dropwise to the above solution, stir, and stop adding ammonia water when the pH value is adjusted to 10.0-12.0. Place the beaker in a 70°C water bath and stir for 4h, then transfer to 80°C o C oven for further drying.

[0044] (3) The dry gel is calcined in a muffle furnace, and after a calcination time of 10 hours at a calcination temperatur...

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Abstract

The invention relates to porous magnesium manganate and a preparation method and application thereof. The preparation method of the porous magnesium manganate comprises the following steps of S1, mixing magnesium nitrate and manganese nitrate according to a molar ratio of (1 to 1.1):(1 to 1.1), adding a complexing agent and water, and dissolving to form a uniform solution; S2, gradually dripping ammonia water into the obtained uniform solution in step S1, stirring, reacting for 0.5 to 72h at the temperature of 40 to 100 DEG C, and drying, so as to obtain xerogel; S3, calcining the obtained xerogel in step S2 for 0.1 to 240h at the temperature of 150 to 750 DEG C, cooling, and grinding, so as to obtain the porous magnesium manganate. The preparation method of the porous magnesium manganatehas the advantages that the conditions are mild, the operation is simple, and the cost is low; the prepared porous magnesium manganate can be used as a catalyst to catalyze to degrade the undegradablepollutants in the environment.

Description

technical field [0001] The invention relates to the fields of photocatalysis, ozone catalytic oxidation and environmental materials, in particular to a porous magnesium manganate and its preparation method and application. Background technique [0002] Refractory organic pollutants such as persistent organic compounds, endocrine disruptors, and drugs in water are increasing day by day. These pollutants have poor biodegradability, great harm, and are difficult to remove, seriously affecting water quality and threatening people's life and health as well as the sustainable development of urban economy and society. . Advanced oxidation technology can effectively remove or even mineralize these pollutants, and is a very competitive water treatment technology. Among them, photocatalytic technology and ozone oxidation technology are two kinds of advanced oxidation oxidation technologies widely studied, and photocatalytic ozonation technology has higher water treatment efficiency d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/34B01J35/00B01J35/10B01D53/86C02F1/30C02F1/72C02F1/78C02F101/30
CPCB01D53/86C02F1/30C02F1/725C02F1/78B01J23/34C02F2305/10C02F2101/30B01J35/60B01J35/39
Inventor 田双红陆江熊亚
Owner SUN YAT SEN UNIV
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