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A preparation method of layered double metal oxide adsorbent for effectively removing low-concentration phosphate

A layered bimetal and oxide technology, applied in the field of nanomaterials, achieves the effects of small pore volume, mild conditions and simple operation

Active Publication Date: 2017-08-01
肇庆市高要区永恒之辉金属制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the hydrophobic ionic liquid BmimPF 6 Oil phase, BmimPF with N,N-dimethylformamide (DMF) as co-solvent 6 / DMF / H 2 The preparation of ultra-thin LDH nanosheets with small particle size in the water-in-O ionic liquid reversed-phase SFME system, followed by high-temperature calcination to prepare LDO, and the use of it for the adsorption of low-concentration phosphate in water have not been reported yet.

Method used

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  • A preparation method of layered double metal oxide adsorbent for effectively removing low-concentration phosphate
  • A preparation method of layered double metal oxide adsorbent for effectively removing low-concentration phosphate
  • A preparation method of layered double metal oxide adsorbent for effectively removing low-concentration phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Weigh MgCl respectively 2 ·6H 2 O and AlCl 3 9H 2 O, add deionized water to prepare a total metal ion concentration of 0.45mol / L, MgCl 2 and AlCl 3 The molar concentration ratio is 2:1; N,N-dimethylformamide (DMF) and hydrophobic ionic liquid BmimPF are added to the mixed salt solution 6 , where mixed saline solution, DMF and BmimPF 6 The volume ratio of the solution was 4:48:48, stirred magnetically at room temperature for 40 minutes, and the inverse microemulsion A was prepared after the solution changed from turbid to transparent;

[0033] 2) Take a certain volume concentration of 25% ammonia water, add DMF and BmimPF to it 6 , make 25% ammonia water, DMF and BmimPF 6 The volume ratio of the solution was 4:48:48, magnetically stirred at room temperature for 40 minutes, and the inverse microemulsion B was prepared after the solution changed from turbid to transparent;

[0034] 3) Under the condition of magnetic stirring, titrate the inverse microemulsion A ...

Embodiment 2

[0037] 1) With reference to the method and preparation conditions in Example 1 step 1), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio is 7:46.5:46.5, and the inverse microemulsion A is prepared;

[0038] 2) With reference to the method and preparation conditions in Example 1 step 2), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:46.5:46.5, and the inverse microemulsion B is prepared;

[0039] 3) Using the method and preparation conditions in step 3) of Example 1, the precursor small particle size ultra-thin hydrotalcite-like nanosheets are obtained;

[0040] 4) Using the method and preparation conditions in Step 4) of Example 1, calcining the precursor small particle size ultra-thin hydrotalcite-like nanosheets obtained in the previous step to obtain a layered double metal oxide adsorbent, denoted as LDO b .

Embodiment 3

[0042] 1) With reference to the method and preparation conditions in Example 1 step 1), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:31:62, and the inverse microemulsion A is prepared;

[0043] 2) With reference to the method and preparation conditions in Example 1 step 2), only change the mixed salt solution, DMF and BmimPF 6 The volume ratio of is 7:31:62, and the inverse microemulsion B is prepared;

[0044] 3) Using the method and preparation conditions in step 3) of Example 1, the precursor small particle size ultra-thin hydrotalcite-like nanosheets are obtained;

[0045] 4) Using the method and preparation conditions in Step 4) of Example 1, calcining the precursor small particle size ultra-thin hydrotalcite-like nanosheets obtained in the previous step to obtain a layered double metal oxide adsorbent, denoted as LDO c .

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Abstract

The invention discloses a preparation method and application of a stratiform bimetallic oxide sorbent capable of effectively removing low-concentrated phosphate radical. According to the invention, a hydrophobic ionic liquid BmimPF6 is taken as oil phase, and N,N-dimethyl formamide (DMF) is taken as a cosolvent in a Bmim PF6 / DMF / H2O ionic liquid-in-water inverse surfactant-free microemulsion system, a small particle diameter ultrathin stratiform bimetallic hydroxide nanosheets precursor is prepared according to a double microemulsion coprecipitation method, calcination of the precursor is carried out at high temperature of 500 DEG C so as to prepare stratiform bimetallic oxides adsorbent. The obtained stratiform bimetallic oxides are 107.36-158.46 cm<2> / g in specific surface area, 8.56-11.17 nm in pore diameter, and 0.358-0.468 cm<3> / g in pore volume. The stratiform bimetallic oxides can restore and form stratiform bimetallic hydroxide nanosheets in an aqueous medium, wherein the particle diameter of nanosheets is 150-200 nm, the thickness is about 5 nm, and the distribution of particle diameters is uniform. The adsorption rate of the stratiform bimetallic oxides is far higher than that of large-grained hydrotalcite prepared from the precursor stratiform bimetallic oxides of the sorbent according to the traditional coprecipitation method.

Description

[0001] Technical field: [0002] The invention relates to a method for preparing a layered double metal oxide adsorbent that can effectively remove low-concentration phosphate radicals, and the application of the layered double metal oxide adsorbent obtained by the preparation method to adsorb low-concentration phosphate radicals in water bodies, belonging to field of nanomaterials. [0003] Background technique: [0004] With the development of industrial and agricultural modernization, a large amount of nutrients such as nitrogen and phosphorus enter the water body with the sewage, causing eutrophication in the water body of the coastal waters and lakes, causing the rapid reproduction of algae and other plankton, resulting in the deterioration of the water quality and the death of a large number of aquatic organisms. Not only will it destroy the ecosystem, but the toxins produced will threaten human health through the food chain. Studies have shown that phosphorus is the key...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/08B01J20/30C02F1/28
Inventor 孙源詹天荣杨琦徐洁侯万国
Owner 肇庆市高要区永恒之辉金属制品有限公司
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