A kind of layered double metal-based nano-lanthanum material and its preparation method and application

A layered bimetallic and bimetallic salt technology, applied in chemical instruments and methods, other chemical processes, ion exchange water/sewage treatment, etc., can solve the problem of low lanthanum loading, low isoelectric point of carrier, and anti-interference ability of materials Poor problems, to achieve high phosphorus removal effect, conducive to phosphorus removal, and stable adsorption effect

Active Publication Date: 2022-02-08
NANJING UNIV
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Problems solved by technology

[0006] For existing lake phosphorus passivators The uniformity and stability of the nano-lanthanum composite material obtained by loading by the concentration difference method are low in the amount of lanthanum loaded, the amount of phosphorus adsorption is small, the isoelectric point of the carrier is low, the anti-interference ability of the material is poor, and the removal ability of organic phosphorus is weak. , the present invention provides a resin LDHs-based nano-lanthanum material, its preparation method and its application. In the method, LDHs with anion exchange capacity are synthesized by co-precipitation method as a carrier, and the adsorption and ion exchange capacity of LDHs are used to realize the precursor introduction of lanthanum. Then in situ precipitation by precipitant to form nano-lanthanum composites with LDHs as carrier

Method used

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  • A kind of layered double metal-based nano-lanthanum material and its preparation method and application
  • A kind of layered double metal-based nano-lanthanum material and its preparation method and application
  • A kind of layered double metal-based nano-lanthanum material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Prepare 2.25mol L -1 MgCl 2 and 0.75mol L -1 FeCl 3 The mixed solution of bimetallic salt is solution A, and 2mol L of precipitant is prepared -1 NaOH and 0.2mol L -1 Na 2 CO 3 is solution B;

[0047] 2) Slowly pump solution A and solution B into the system at the same time for co-precipitation reaction, and keep stirring to mix the reaction system evenly, during which the reaction pH=10.0 is kept constant at a specific value until the end of the reaction;

[0048] 3) Place the reaction product obtained in step 2 in a water bath at 65°C for 18 hours to crystallize by heating in a water bath;

[0049] 4) The product in step 3 is centrifuged, washed with distilled water until neutral, dried, and ground into powder to obtain the product Mg / Fe-LDHs.

[0050] 5) Calcining the above Mg / Fe-LDHs powder material in a muffle furnace at a certain temperature of 400°C for 2 hours to obtain Mg / Fe-LDOs;

[0051] 6) Add Mg / Fe-LDOs to 3.75gLa·L -1 (10g·L -1 LaCl 3 ·7H 2...

Embodiment 2

[0056] 1) Prepare 2.25mol L -1 MgCl 2 and 0.75mol L -1 AlCl 3 The mixed solution of bimetallic salt is solution A, and 2mol L of precipitant is prepared -1 NaOH and 0.2mol L -1 Na 2 CO 3 is solution B;

[0057]2) Slowly pump solution A and solution B into the system at the same time for co-precipitation reaction, and keep stirring to mix the reaction system evenly, during which the reaction pH=9.5 is kept constant at a specific value until the end of the reaction;

[0058] 3) The reaction product obtained in step 2 was placed in a certain 80°C water bath for 12 hours to carry out heating and crystallization in the water bath;

[0059] 4) The product in step 3 is centrifuged, washed with distilled water until neutral, dried, and ground into powder to obtain the product Mg / Al-LDHs.

[0060] 5) Calcining the above Mg / Al-LDHs powder material in a muffle furnace at a certain temperature of 500°C for 2 hours to obtain Mg / Al-LDOs;

[0061] 6) Add Mg / Al-LDOs to 12.5gLa·L -1 ...

Embodiment 3

[0066] Steps 1) to 5) are the same as in Example 1, and the alcohol solution concentration of lanthanum in step 6) is changed to a series of different concentrations, followed by: 0.75gLa L -1 (2.0g·L -1 LaCl 3 ·7H 2 O), 1.875gLa·L -1 (5.0g·L -1 LaCl 3 ·7H 2 O), 3.75gLa·L -1 (10.0g·L -1 LaCl 3 ·7H 2 O), 6.25gLa·L -1 (16.67g·L -1 LaCl 3 ·7H 2 O), the solid-to-liquid ratio was changed to 1:100.

[0067] The material L-CMF-x obtained in this example is in the form of brown powder, and its lanthanum loading measured by ICP after digestion is: 6.79%, 14.70%, 21.9%, 41.34%; the adsorption experiment results show that L-CMF-x PO 4 The adsorption capacity is: 42.64mgP·g -1 , 55.02mgP·g -1 , 64.88mgP·g -1 , 89.70mgP·g -1 . The above results are compared with Example 1 to illustrate that the L-CMF-x series materials with Mg / Fe-LDHs as the carrier can obtain materials with different lanthanum loadings by adjusting the concentration of the alcohol solution of lanthanum...

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Abstract

The invention discloses a layered bimetallic-based nanometer lanthanum adsorption material and its preparation method and application, belonging to the field of environmental functional materials. It includes calcining the prepared LDHs at a certain temperature to obtain LDOs, adding LDOs to an alcohol solution of a certain concentration of lanthanum salt to stir the reaction, filtering out the obtained product, washing with alcohol and drying, adding the precipitant to the precipitation reaction, and filtering out the precipitation reaction The product is washed with distilled water to neutrality, and dried to obtain LDHs-based nano-lanthanum adsorption material; the present invention uses LDHs with excellent anion exchange capacity as a carrier, which is different from the carrier bentonite (cation exchange clay), and its higher isoelectric points (~12.0) make the material easier to use with PO 4 Electrostatic attraction is beneficial to phosphorus removal.

Description

technical field [0001] The invention belongs to the field of environmental functional materials, and more specifically relates to a layered bimetallic-based nano-lanthanum material, a preparation method and an application. Background technique [0002] The cyanobacteria outbreak and black odor phenomenon caused by water eutrophication have seriously damaged the aquatic ecosystem. Excessive phosphorus element is the key cause of this problem. Phosphorus control in water body has become an important means to curb eutrophication. Phosphorus control technology In addition to traditional coagulants and precipitants such as iron salts, aluminum salts, and calcium salts, there have been more researches on efficient phosphorus adsorption agents for lakes and other natural water bodies in recent years. Lanthanum is a rare earth element with low toxicity and abundant reserves. It has received continuous attention in the field of phosphorus removal due to its strong affinity with phosp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/30B01J41/02B01J41/10C02F1/28C02F1/42C02F101/10C02F101/20C02F101/30
CPCB01J20/06C02F1/281C02F1/42B01J41/02B01J41/10C02F2001/422C02F2101/30C02F2101/10C02F2101/103C02F2101/20
Inventor 张延扬孔波潘丙才
Owner NANJING UNIV
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