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Preparation and application methods for magnetic core-shell nano composite adsorbent

A nano-composite, adsorbent technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, silicon compounds, etc., can solve the limitation of adsorbent recovery, regeneration and recycling, reduction of adsorbent specific surface area, and reduced adsorption capacity, etc. problems, to achieve the effects of good environmental and economic benefits, excellent adsorption performance, and large adsorption capacity

Inactive Publication Date: 2017-08-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, cerium oxide, like most adsorbent materials, has the problem of difficult solid-liquid separation after adsorption in its nanopowder, which limits the recovery and recycling of the adsorbent.
[0005] A common solution to the above problems is to granulate nanopowders, but this will lead to a decrease in the specific surface area of ​​the adsorbent and a decrease in the adsorption capacity.

Method used

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  • Preparation and application methods for magnetic core-shell nano composite adsorbent
  • Preparation and application methods for magnetic core-shell nano composite adsorbent
  • Preparation and application methods for magnetic core-shell nano composite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] Embodiment 1 A magnetic core-shell Fe 3 o 4 @SiO 2 @CeO 2 Preparation method of nanocomposite adsorbent

[0025] 1) Magnetic Fe 3 o 4 Preparation of nanoparticles: weigh 2.7g FeCl 3 ·6H 2 O and 1.2 g FeCl 2 ∙4H 2 O, dissolve it in 20ml deionized water to prepare Fe 3+ and Fe 2+ Mix the solution; measure 5ml of ammonia water with a mass concentration of 25-28%, and add it to 50ml of deionized water to make a mother liquor; feed nitrogen into the mother liquor and start a mechanical stirring device, and drop Fe into the mother liquor under stirring conditions 3+ and Fe 2+ Mix the solution, react at 80°C for 60 minutes, then add 4g of sodium citrate to react for 60 minutes, cool to room temperature naturally, pour off the supernatant after magnetic separation, collect the black sediment, wash with distilled water until neutral, and then wash with 90ml of absolute ethanol Wash three times and dry in a vacuum oven at 50°C for 12 hours to obtain sodium citrate-mod...

Embodiment approach 2

[0029] Embodiment 2 A magnetic core-shell Fe 3 o 4 @SiO 2 @CeO 2 Preparation method of nanocomposite adsorbent

[0030] 1) Magnetic Fe 3 o 4 Preparation of nanoparticles: weigh 5.4g FeCl 3 ·6H 2 O and 2.4 g FeCl 2 ∙4H 2 O, dissolve it in 40ml deionized water to prepare Fe 3+ and Fe 2+ Mix the solution; measure 10ml of ammonia water with a mass concentration of 25-28%, and add it to 50ml of deionized water to make a mother liquor; feed nitrogen into the mother liquor and start a mechanical stirring device, and drop Fe into the mother liquor under stirring conditions 3+ and Fe 2+ Mix the solution, react at 90°C for 60 minutes, then add 8g of sodium citrate to react for 90 minutes, naturally cool to room temperature, pour off the supernatant after magnetic separation, collect the black sediment, wash with distilled water until neutral, and then wash with 90ml of absolute ethanol Wash three times and dry in a vacuum oven at 50°C for 18 hours to obtain sodium citrate-mo...

Embodiment approach 3

[0033] Embodiment 3 A magnetic core-shell Fe 3 o 4 @SiO 2 @CeO 2 Preparation method of nanocomposite adsorbent

[0034] 1) Magnetic Fe 3 o 4 Preparation of nanoparticles: weigh 1.8g FeCl 3 ·6H 2 O and 1.6 g FeCl 2 ∙4H 2 O, dissolve it in 15ml deionized water to prepare Fe 3+ and Fe 2+ Mix the solution; measure 4ml of ammonia water with a mass concentration of 25-28%, and add it to 50ml of deionized water to make a mother liquor; feed nitrogen into the mother liquor and start a mechanical stirring device, and drop Fe into the mother liquor under stirring conditions 3+ and Fe 2+ Mix the solution, react at 80°C for 60 minutes, then add 3g of sodium citrate to react for 60 minutes, naturally cool to room temperature, pour off the supernatant after magnetic separation, collect the black sediment, wash with distilled water until neutral, and then wash with 90ml of absolute ethanol Wash three times and dry in a vacuum oven at 50°C for 10 hours to obtain sodium citrate-mod...

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Abstract

Preparation and application methods for a magnetic core-shell nano composite adsorbent. The invention belongs to the fields of preparation and application of water treatment technology and adsorbents and mainly solves the problem that a conventional adsorbent is difficult to separate, as a solid phase, from a liquid phase and recycle after adsorption. The preparation method includes the steps of: 1) preparing Fe3O4 nano-particles having super paramagnetism through a coprecipitating method; 2) coating the surface of the Fe3O4 nano-particles with a SiO2 layer through a two-phase method to synthesize magnetic core-shell Fe3O4@SiO2 nanoparticles; 3) with the Fe3O4@SiO2 nanoparticles as a carrier and cetyl trimethyl ammonium bromide (CTAB) as a template agent, supporting a CeO2 layer onto the surface of the Fe3O4@SiO2 nanoparticles; 4) washing away the template agent CTAB with acetone to obtain the magnetic core-shell Fe3O4@SiO2@CeO2 nano composite adsorbent which has a mesoporous CeO2 layer. The magnetic core-shell Fe3O4@SiO2@CeO2 nano composite adsorbent has excellent magnetism, large specific surface area and a large number of adsorption sites, has significant removal effect on phosphates in water, is easy to separate, recycle and reuse after adsorption, and has excellent environment and economic benefits.

Description

technical field [0001] The preparation and application method of a magnetic core-shell nanocomposite adsorbent of the present invention belongs to the field of water treatment technology and preparation and application of adsorbent, and specifically relates to a magnetic core-shell Fe 3 o 4 @SiO 2 @CeO 2 The nanocomposite adsorbent and the preparation method of the magnetic core-shell nanocomposite adsorbent also relate to the application of the magnetic core-shell nanocomposite adsorbent in water treatment. Background technique [0002] In recent years, due to people's non-standard production measures and unreasonable living habits, a large amount of industrial wastewater and domestic sewage containing phosphate have been discharged into rivers and lakes, causing eutrophication of water bodies, causing excessive algae and other plankton in the water Reproduction, resulting in a sharp decrease in dissolved oxygen concentration in water, water quality continues to deterior...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/30B01J20/28C02F1/28C02F101/10
CPCB01J20/06B01J20/103B01J20/28009B01J20/28021B01J2220/42B01J2220/4806B01J2220/4812C02F1/281C02F2101/105
Inventor 王俊文丁鸿赵燕凌丁传敏张冰谢鲜梅
Owner TAIYUAN UNIV OF TECH
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