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
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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

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
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Example Embodiment

[0036] Example 1:

[0037] CeO in this example 2 The preparation method of / CaAl-LDHs / AC composite is as follows:

[0038] 1) Activated carbon pretreatment

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

[0040] 2) Preparation of composite materials

[0041] At 80°C, 10.0g AC was subjected to vacuum-heating-decompression (vacuum degree of 0.02MPa) for 1 hour, immediately added to 80.0mL of mixed solution B, and adjusted to pH 9.3 by 1.0mol / L NaOH solution. Subsequently, the ultrasonic assisted co-precipitation was carried out for 1 hour under the conditions of ultrasonic power of...

Example Embodiment

[0044] Example 2:

[0045] CeO in this example 2 The preparation method of / CaAl-LDHs / AC composite is as follows:

[0046] 1) Activated carbon pretreatment

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

[0048] 2) Preparation of composite materials

[0049] After vacuum-heating-decompression (vacuum degree 0.08MPa) with 5.0g AC at 100°C for 2 hours, immediately add 100.0mL mixed solution B, adjust the pH to 7.5 by 1.0mol / L NaOH solution, Subsequently, the ultrasonic assisted co-precipitation was carried out for 1 hour under the conditions of ultrasonic power of 40W and temperature of...

Example Embodiment

[0052] Example 3:

[0053] CeO in this example 2 The preparation method of / CaAl-LDHs / AC composite is as follows:

[0054] 1) Activated carbon pretreatment

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

[0056] 2) Preparation of composite materials

[0057] After vacuum-heating-decompression (vacuum: 0.05MPa) treatment with 20.0g AC at 100°C for 2 hours, immediately add 100.0mL of mixed solution B, adjust the pH to 7.5 with 1.0mol / L NaOH solution, Subsequently, the ultrasonic assisted co-precipitation was carried out for 30 minutes under the condi...

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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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