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Layered double-metal-based nano lanthanum material as well as preparation method and application thereof

A layered bimetallic and bimetallic salt technology is applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc. Low problems, to achieve the effect of phosphorus removal

Active Publication Date: 2021-01-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Layered double-metal-based nano lanthanum material as well as preparation method and application thereof
  • Layered double-metal-based nano lanthanum material as well as preparation method and application thereof
  • Layered double-metal-based nano lanthanum material as well as preparation method and application thereof

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 double-metal-based nano lanthanum adsorbing material as well as a preparation method and application thereof, and belongs to the field of environmental functional materials. The preparation method comprises the following steps: calcining prepared LDHs at a certain temperature to obtain LDOs, adding the LDOs into an alcoholic solution of lanthanum salt with a certain concentration, carrying out a stirring reaction, filtering out an obtained product, carrying out alcohol washing, drying, adding a precipitant, carrying out a precipitation reaction, filtering outa precipitation reaction product, carrying out washing with distilled water to a neutral state, and carrying out drying to obtain the LDHs-based nano lanthanum adsorption material. According to the invention, LDHs with excellent anion exchange capability are used as a carrier, and different from carrier bentonite (cation exchange clay), the higher isoelectric point (to 12.0) of LDHs enables the material to be more easily electrostatically attracted with PO4 so as to be 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 Applications(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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