Preparation and application of cerium oxide modified porous silicon-based microsphere adsorbent

A technology based on porous silicon and cerium oxide, which is applied in the direction of adsorption of water/sewage treatment, alkali metal oxides/hydroxides, inorganic chemistry, etc., can solve problems such as difficult application of column separation technology and limit industrial application, and achieve product Good sphericity, cost-saving experiment, and wide-ranging sources

Active Publication Date: 2018-09-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the column separation method is generally used in industry to remove various ions in wastewater, which requires an adsorbent that can be directly packed into the column, so the adsorbent must have a certain size and shape, and the spherical shape is the best; and the prepared CeO 2 Most of them are powders, which are difficult to apply to the column separation process, which seriously limits its industrial application

Method used

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  • Preparation and application of cerium oxide modified porous silicon-based microsphere adsorbent

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Experimental program
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Effect test

Embodiment 1

[0034] (1) Preparation of tetravalent cerium salt solution: 9g CeCl 3 ·7H 2 O was dissolved in 90g of distilled water, and then 1.8g of 30% H 2 o 2 Add it dropwise to the above solution while stirring, and then let it stand for 1 hour to make it oxidize more thoroughly;

[0035] (2) Carrying of tetravalent cerium salt: the tetravalent cerium salt aqueous solution of step (1) and 25g porous silica microspheres are transferred in the eggplant-shaped flask together, and the rotation speed of the control rotary evaporator is 30rpm, and rotary evaporation The temperature is 45 degrees Celsius, the vacuum degree is maintained at 5KPa, and the rotary evaporation time is 3 hours;

[0036] (3) Aging: the porous silica microspheres loaded with tetravalent cerium salt in step (2) are poured into 20 milliliters of ammonia water with a mass fraction of 10%, and the pH value of the control solution is 8, and at 60 Heating for half an hour in a water bath at 100°C, then standing and agin...

Embodiment 2

[0043] (1) Preparation of tetravalent cerium salt solution: 7.5gCeCl 3 ·7H 2 O was dissolved in 120g of distilled water, and then 3g of 30% H 2 o 2 Add it dropwise to the above solution while stirring, and then let it stand for 2 hours to make it oxidize more thoroughly;

[0044] (2) Loading of tetravalent cerium salt: the tetravalent cerium salt aqueous solution of step (1) and 15g porous silica microspheres are transferred together in the eggplant-shaped flask, and the rotation speed of the control rotary evaporator is 100rpm, and the rotary evaporation The temperature is 60 degrees Celsius, the vacuum degree is maintained at 60KPa, and the rotary evaporation time is 2 hours;

[0045] (3) Aging: the porous silica microspheres loaded with tetravalent cerium salt in step (2) are poured into 30 milliliters of ammonia water with a mass fraction of 15%, the pH value of the control solution is 11, and at 90 Heating for half an hour in a water bath at 100°C, then standing and a...

Embodiment 3

[0052] (1) Preparation of tetravalent cerium salt solution: 12gCe 2 (SO 4 ) 3 ·8H 2 O was dissolved in 150g of distilled water, and then 5g of 30% H 2 o 2 Add it dropwise to the above solution while stirring, then let it stand for 8 hours to make it oxidize more thoroughly;

[0053] (2) Carrying of tetravalent cerium salt: the tetravalent cerium salt aqueous solution of step (1) and 25g porous silica microspheres are transferred together in the eggplant-shaped flask, and the rotational speed of the control rotary evaporator is 150rpm, and rotary evaporation The temperature is 80 degrees Celsius, the vacuum degree is maintained at 50KPa, and the rotary evaporation time is 4 hours;

[0054] (3) Aging: the porous silica microspheres loaded with tetravalent cerium salt in step (2) are poured into 20 milliliters of ammonia water with a mass fraction of 20%, and the pH value of the control solution is 9, and at 80 Heating for half an hour in a water bath at 100°C, then standin...

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Abstract

The invention discloses a preparation method of cerium oxide modified porous silicon-based microspheres. A cerium salt aqueous solution is supported on porous silicon-based microspheres by using a vacuum rotary evaporation technology. According to the preparation method provided by the invention, a vacuum rotary evaporation technology is adopted, the reaction condition in a whole experimental process is mild, high-temperature calcination is not needed, the energy consumption is reduced, the experimental cost is saved, the preparation process is simple, the operation is easy, and the use of binders and other additives is avoided. Experiments show that the efficiency of preparing CeO2.nH2O@SiO2 porous microspheres by the method provided by the invention is high, the sphericity of the productis high, the particle size distribution is uniform, the specific surface area is up to 70m<2>/g, and the microspheres can be directly packed into a column for a column separation experiment. A resultshows that CeO2.nH2O@SiO2 porous microspheres provided by the invention have a high CeO2 loading capacity, have a good adsorption effect on fluoride ions and iodate ions in water, and have a wide application prospect in the treatment of water pollution.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth oxide adsorption materials, in particular to the preparation and application of a cerium oxide modified porous silicon-based adsorbent. Background technique [0002] Cerium is the most abundant element among the rare earth elements, and its oxide (CeO 2 ) is an inexpensive and versatile rare earth material. CeO 2 Mainly used in automobile exhaust catalysts, polishing materials, sensors, rubber and ceramics, etc. In addition, hydrated cerium oxide (CeO 2 ·nH 2 O) has a good adsorption and removal effect on anions such as fluoride ions and iodate, and is an inorganic ion exchanger. Compared with traditional organic ion exchange resins, it has the advantages of high temperature resistance, stability and long life. At present, the column separation method is generally used in industry to remove various ions in wastewater, which requires an adsorbent that can be directly packed into the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/28B01J20/30C02F1/28C02F1/42C02F101/12C02F101/14C02F101/36
CPCB01J20/06B01J20/103B01J20/28019B01J20/28059C02F1/281C02F1/42C02F2101/12C02F2101/14C02F2101/36
Inventor 王开拓韦悦周王帆
Owner GUANGXI UNIV
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