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Method for preparing cerium dioxide / calcium aluminum layered di-hydroxy composite metal oxide / activated carbon composite material

A layered double hydroxyl and composite metal technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of reducing the adsorption effect of materials, easy to block the micropores of activated carbon, and large particle size of LDHs and other problems, to achieve the effect of good adsorption effect, excellent adsorption performance, simple and fast process

Active Publication Date: 2015-04-08
HEFEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The synthesis time is usually more than 12 hours, and the formed LDHs have a large particle size, which is easy to block the micropores of activated carbon and reduce the adsorption effect of the material.
Although ultrasonic-assisted co-precipitation can form LDHs with small particle size and large specific surface area (Yu Zhong, et al. Journal of Hazardous Materials, 2013, 250-251, 345-353; Yanlin Li, et al. -302), but in actual operation, since the solution cannot quickly soak into the inner surface of the activated carbon, a longer immersion time is required, otherwise LDHs will only form on the outer surface of the activated carbon, not the inner surface, and it is easy to block the pores

Method used

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  • Method for preparing cerium dioxide / calcium aluminum layered di-hydroxy composite metal oxide / activated carbon composite material
  • Method for preparing cerium dioxide / calcium aluminum layered di-hydroxy composite metal oxide / activated carbon composite material
  • Method for preparing cerium dioxide / calcium aluminum layered di-hydroxy composite metal oxide / activated carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] CeO in this example 2 / CaAl-LDHs / AC composites were prepared as follows:

[0038] 1) Activated carbon pretreatment

[0039] Immerse 50.0 g of activated carbon with nitric acid solution with a mass concentration of 65% at room temperature for 7 hours to eliminate surface impurities, wash and dry; immerse 10.0 g of activated carbon after nitric acid solution treatment into 50.0 mL of 0.001 mol / L tetraoxaloacetic acid solution , sonicated for 1 hour at room temperature, washed with distilled water and dried in vacuum to obtain pretreated activated carbon, denoted as AC.

[0040] 2) Preparation of composite materials

[0041] At 80°C, 10.0 g of AC was vacuum-heated-depressurized (vacuum degree 0.02 MPa) for 1 hour, then immediately added to 80.0 mL of mixed solution B, and the pH value was adjusted to 9.3 by 1.0 mol / L NaOH solution. Then ultrasonically assisted co-precipitation under the conditions of ultrasonic power 60W and temperature 30°C for 1 hour, and finally aged...

Embodiment 2

[0045] CeO in this example 2 / CaAl-LDHs / AC composites were prepared as follows:

[0046] 1) Activated carbon pretreatment

[0047] 50.0 g of activated carbon was soaked with a nitric acid solution with a mass concentration of 65% at room temperature for 7 hours to eliminate surface impurities, washed and dried; the activated carbon after 5.0 g of the nitric acid solution was immersed in 50.0 mL of 0.01 mol / L diaminoacetic acid solution, Sonicate at room temperature for 2 hours, take it out, wash it with distilled water and dry it in vacuum to obtain pretreated activated carbon, denoted as AC.

[0048] 2) Preparation of composite materials

[0049] At 100°C, 5.0g AC was subjected to vacuum-heating-decompression (vacuum degree 0.08MPa) treatment for 2 hours, then immediately added to 100.0mL mixed solution B, and the pH value was adjusted to 7.5 by 1.0mol / L NaOH solution, Then ultrasonically assisted co-precipitation under the conditions of ultrasonic power 40W and temperatur...

Embodiment 3

[0053] CeO in this example 2 / CaAl-LDHs / AC composites were prepared as follows:

[0054] 1) Activated carbon pretreatment

[0055] Immerse 50.0 g of activated carbon with nitric acid solution with a mass concentration of 65% at room temperature for 7 hours to eliminate surface impurities, wash and dry; immerse 20.0 g of activated carbon after nitric acid solution treatment into 100.0 mL of 0.002 mol / L ethylenediaminetetraoxalyl In acetic acid solution, ultrasonic at room temperature for half an hour, take out, wash with distilled water and dry in vacuum to obtain pretreated activated carbon, denoted as AC.

[0056] 2) Preparation of composite materials

[0057] At 100°C, 20.0g AC was subjected to vacuum-heating-decompression (vacuum degree 0.05MPa) treatment for 2 hours, then immediately added to 100.0mL mixed solution B, and the pH value was adjusted to 7.5 by 1.0mol / L NaOH solution, Then ultrasonically assisted co-precipitation under the conditions of ultrasonic power 90W...

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Abstract

The invention discloses a method for preparing a cerium dioxide / calcium aluminum layered di-hydroxy composite metal oxide / activated carbon composite material. The method is as below: conducting vacuum-pumping on activated carbon under certain temperature; then quickly adding a reaction solution, so that the reaction solution quickly immerses in the internal part of activated carbon under the effect of atmospheric pressure difference; codcnuting ultrasound assisted precipitation for one-step rapid synthesis of the CeO2 / CaAl-LDHs / AC composite material. The CeO2 / CaAl-LDHs / AC composite material of the invention not only has excellent absorption performance on common pollutants such as chromium, lead, fluorine and malachite green in water, but also is convenient for operation, easy for separation, and high in thermal stability.

Description

1. Technical field [0001] The invention relates to a preparation method of a cerium oxide / calcium aluminum layered double hydroxyl compound metal oxide / activated carbon composite material, which uses activated carbon as a carrier and adopts ultrasonic-assisted co-precipitation under vacuum-heating-decompression conditions The material can be used to adsorb chromium, lead, fluorine and malachite green dyes in aqueous solution. 2. Background technology [0002] Calcium-aluminum layered double hydroxy compound metal oxides (CaAl-LDHs) are a good sewage treatment agent, which can be used to adsorb and remove organic substances such as methyl orange (Ping Zhang, et al. Journal of Colloid and Interface Science, 2012, 365, 110 -116); dichromate (CrO 4 2- ) (Yanlin Li, et al. Chemical Engineering Journal, 2013, 218, 295-302), arsenate (AsO 4 3- ) (CN103058338A). Since CaAl-LDHs and fluoride ions (F - ) is weaker than chemical bonds, and the fluorine removal efficiency is low, ...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30C02F1/28
CPCB01J20/06B01J20/20B01J20/22B01J2220/46B01J2220/4806B01J2220/4812C02F1/281C02F1/283C02F1/285C02F2101/14C02F2101/20C02F2101/22C02F2101/308
Inventor 晋冠平谢非管家乡
Owner HEFEI UNIV OF TECH
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