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kind of la@zr@sio 2 Preparation method of @bentonite composite phosphorus removal adsorbent

A composite adsorption and bentonite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage treatment, etc., can solve the problems of bentonite adsorbents that are not easy to separate and regenerate, limited phosphorus adsorption capacity, and high viscosity of bentonite. Achieve good reusability, easy access, and low cost

Active Publication Date: 2022-07-19
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Abstract
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Problems solved by technology

In addition, its interlayer is rich in Ca 2+ 、Na + and K + , and has strong cation exchange capacity, but the adsorption capacity of natural bentonite to phosphorus is limited, so it needs to be modified to improve its phosphorus removal capacity
[0004] At present, researchers have used a variety of methods and different reagents to modify bentonite, such as calcination, acid impregnation, and single inorganic salt modification such as Ca, Mg, Al, Fe, La, and Zr. Among the bentonite-based phosphorus removal adsorbents, although the modification method is simple and the reagents are cheap, etc., there is a common problem that the adsorption capacity is not high.
In addition, most of the bentonite adsorbents for phosphorus removal exist in the form of powder, and the bentonite itself has high viscosity and easy expansion characteristics, making it difficult to separate and regenerate bentonite adsorbents, which are limited in practical applications.

Method used

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  • kind of la@zr@sio <sub>2</sub> Preparation method of @bentonite composite phosphorus removal adsorbent
  • kind of la@zr@sio <sub>2</sub> Preparation method of @bentonite composite phosphorus removal adsorbent
  • kind of la@zr@sio <sub>2</sub> Preparation method of @bentonite composite phosphorus removal adsorbent

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Experimental program
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Effect test

Embodiment 1

[0032] 1) Mix 20.0 g of cetyltrimethylammonium bromide and 80.0 mL of ammonia water in 1000.0 mL of deionized water, and stir for 1 h to obtain a mixed solution;

[0033] 2) 80.0 mL of ethyl orthosilicate was added to the mixed solution in step 1), and stirred for 3 h;

[0034] 3) Weigh 100.0 g of bentonite, add it to the mixture in step 2), stir at room temperature for 6 hours, transfer it to a round-bottomed flask, and react at a constant temperature in an oil bath at 100°C for 24 hours;

[0035] 4) After suction filtration and washing of the solid-liquid mixture in step 3), the solid phase was dried at a constant temperature of 80° C. for 12 hours, and then mixed with the bentonite raw material powder in a mass ratio of 30:1, and 25 mL of 1% PVA aqueous solution was added and fully mixed, After granulation (the particles are cylindrical with a diameter of 1-2mm and a length of 2-3mm), after drying at a constant temperature of 80°C for 12h, the obtained particles are calcine...

Embodiment 2

[0039] 1) Mix 24.0 g of cetyltrimethylammonium bromide with 100.0 mL of ammonia water in 1200 mL of deionized water, and stir for 1 h;

[0040] 2) 90.0 mL of ethyl orthosilicate will be added to the mixed solution in step 1) and stirred for 4 h;

[0041] 3) Weigh 100.0 g of bentonite, add it to the mixture in step 2), stir at room temperature for 7 hours, transfer it to a round-bottomed flask, and react at a constant temperature in an oil bath at 100°C for 24 hours;

[0042] 4) After suction filtration and washing of the solid-liquid mixture in step 3), the solid phase was dried at a constant temperature of 80° C. for 12 hours, and then mixed with the bentonite raw material powder used in the present invention according to a mass ratio of 30:1, and 20 mL of 1.2% PVA aqueous solution was added. And fully mixed, after granulation (the particles are cylindrical with a diameter of 1-2mm and a length of 2-3mm), after drying at a constant temperature of 80°C for 12h, and calcining i...

Embodiment 3

[0046] 1) Mix 34.0 g of cetyltrimethylammonium bromide with 132.0 mL of ammonia water in 1600 mL of deionized water, and stir for 1 h;

[0047] 2) 120.0 mL of ethyl orthosilicate was added to the mixed solution in step 1) and stirred for 4 h;

[0048] 3) Weigh 100.0 g of bentonite, add it to the mixture in step 2), stir at room temperature for 6 hours, transfer it to a round-bottomed flask, and react at a constant temperature in an oil bath at 100°C for 24 hours;

[0049] 4) After suction filtration and washing of the solid-liquid mixture in step 3), the solid phase was dried at a constant temperature of 80° C. for 12 hours, and then mixed with the bentonite raw material powder used in the present invention according to a mass ratio of 30:1, and 18 mL of 1.3% PVA aqueous solution was added. And fully mixed, after granulation (the particles are cylindrical with a diameter of 1-2mm and a length of 2-3mm), after drying at a constant temperature of 80°C for 12h, and calcining in a...

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Abstract

The present invention is a La@Zr@SiO 2 @Preparation method of bentonite phosphorus removal adsorbent. The method includes steps 1) mixing cetyltrimethylammonium bromide and ammonia water in deionized water; 2) slowly adding ethyl orthosilicate to the mixed solution; 3) adding bentonite to the mixed solution and stirring for reaction A solid-liquid mixture is obtained; 4) after the solid-liquid mixture is subjected to suction filtration and washing steps, the solid phase is dried at a constant temperature, and granulated and calcined to be SiO 2 @Bentonite composite material; 5) Dissolve zirconium oxychloride and lanthanum nitrate in absolute ethanol, and mix with SiO 2 @Bentonite composite material stirs the reaction, the solid phase is filtered and dried and then added to the NaOH solution to continue the reaction to obtain a composite adsorbent. The adsorbent prepared by this method can adsorb phosphorus in real sewage in a dynamic system, and has good regeneration ability, which not only provides a method for the utilization of bentonite and the development of new phosphorus adsorption materials, but also provides a method for the treatment of phosphorus-containing wastewater. an effective way.

Description

technical field [0001] The invention belongs to the technical field of environmental adsorption materials, in particular to a La@Zr@SiO 2 @Preparation method of bentonite phosphorus removal adsorbent. Background technique [0002] With the development of my country's economy and the improvement of urban living standards, the problem of water pollution has become more and more serious, and many rivers and lakes have appeared eutrophication to varying degrees. Under the influence of human activities, nutrients such as nitrogen and phosphorus needed by organisms enter slow-flowing water bodies such as lakes, estuaries, and bays, causing algae and other plankton to multiply rapidly, and the amount of dissolved oxygen in the water body decreases. Deterioration, the phenomenon of large numbers of fish and other organisms dying. Phosphorus, as the minimum limiting factor, is the key factor leading to eutrophication of water bodies. Efficient removal of phosphorus from sewage is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C02F101/10C02F101/30
CPCB01J20/12B01J20/02B01J20/103C02F1/281C02F2101/105C02F2101/30
Inventor 钱程刘兴勇徐宇梅张李芸
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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