Lanthanum carbonate-nerchinskite composite material as well as preparation method and application thereof

A technology of lanthanum oxycarbonate and composite materials, applied in the field of environmental pollution treatment, can solve problems such as phosphate adsorption that has not been reported, and achieve the effects of facilitating diffusion and mass transfer, optimization of loadability, and short reaction time

Active Publication Date: 2018-08-10
GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, halloysite as a carrier is mainly used in the fields of drug sustained release and gas catalysis, but there is no report on phosphate adsorption

Method used

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  • Lanthanum carbonate-nerchinskite composite material as well as preparation method and application thereof
  • Lanthanum carbonate-nerchinskite composite material as well as preparation method and application thereof
  • Lanthanum carbonate-nerchinskite composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Mix 10g of halloysite with 10g of lanthanum nitrate hexahydrate and 2g of glycine, add 50ml of deionized water, and sonicate for 10min.

[0028] 2) Put the suspension obtained in step 1) in a 500mL suction filter bottle to vacuumize for 10min, repeat 3 times, then place the suspension in an oven and bake at 80°C for 2 hours to obtain a dry sample.

[0029] 3) The dried sample obtained in step 2) was placed in a tube furnace, purged with nitrogen gas at a flow rate of 100ml / min for 30min, and then kept at a constant temperature of 300°C for 2h to obtain a lanthanum oxycarbonate-halloysite composite material.

[0030] Utilize X-ray diffraction (XRD) to measure the structure of gained lanthanum oxycarbonate-halloysite composite material, the result shows that its X-ray diffraction pattern ( figure 1 ) appeared a characteristic diffraction peak attributed to lanthanum oxycarbonate.

[0031] Batch adsorption experiments were used to test the phosphorus adsorption capacit...

Embodiment 2

[0033] 1) Mix 20g of halloysite with 15g of lanthanum nitrate hexahydrate and 15g of glycine, add 50ml of deionized water, and sonicate for 20min.

[0034] 2) Put the suspension obtained in step 1) into a 500mL suction filter bottle and vacuumize for 15min, repeat 3 times, then place the suspension in an oven and bake at 120°C for 5 hours to obtain a dry sample.

[0035] 3) The dried sample obtained in step 2) was placed in a tube furnace, purged with nitrogen gas at a flow rate of 150ml / min for 30min, and then kept at a constant temperature of 400°C for 2h to obtain a lanthanum oxycarbonate-halloysite composite material.

[0036] Through transmission electron microscopy (TEM) analysis, it was found that lanthanum oxycarbonate was uniformly loaded in the inner and outer tubes of halloysite ( figure 2 ). Batch adsorption experiments were used to test the phosphorus adsorption capacity of the lanthanum oxycarbonate-halloysite composite material, and the adsorption capacity for...

Embodiment 3

[0038] 1) Mix 30g of halloysite with 18g of lanthanum nitrate hexahydrate and 9g of glycine, add 30ml of deionized water, and sonicate for 30min.

[0039] 2) Put the suspension obtained in step 1) in a 250mL suction filter bottle and vacuumize for 30min, repeat 3 times, then place the suspension in an oven, and bake at 130°C for 4 hours to obtain a dry sample.

[0040] 3) Place the solid obtained in step 2) in a tube furnace with a nitrogen flow rate of 160ml / min. After nitrogen protection for 30 minutes, keep the temperature at 450°C for 2 hours. After the tube furnace cools down, take out the sample to obtain lanthanum oxycarbonate - Halloysite composite.

[0041] The phosphorus adsorption capacity of this lanthanum oxycarbonate-halloysite composite material is tested by batch adsorption experiment, and its adsorption capacity for phosphate is 120mg·P / g·adsorbent ( image 3 ).

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Abstract

The invention discloses a lanthanum carbonate-nerchinskite composite material as well as a preparation method and application thereof. Natural nanometer tubular nerchinskite mineral and a lanthanum carbonate precursor solution are uniformly mixed; the composite material of uniformly loading the lanthanum carbonate at the inner and outer parts of a nerchinskite nanometer tube is prepared by methodsof vacuum pumping, low-temperature sintering and the like; the mesoporous structure of nerchinskite is reserved; the inner cavity cannot be blocked; the saturation adsorption capacity on phosphate anions reaches up to 100mg.P / g; the composite material can be used for adsorbing the phosphate anions or preparing a phosphorus removal adsorbent. The preparation method of the composite material also has the advantages that the energy consumption is low; the operation is simple; the preparation period is short, and the like. The preparation method has good application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution treatment. More specifically, the invention relates to a lanthanum oxycarbonate-halloysite composite material for adsorbing phosphate ions and its preparation method and application. Background technique [0002] Lanthanum is a common adsorbent used to repair eutrophic water bodies. Its principle is mainly that phosphate radicals in water combine with lanthanum to form insoluble lanthanum phosphate, which quickly removes phosphate radicals from water bodies. Because lanthanum nanoparticles are easy to agglomerate, most of the lanthanum-containing adsorption materials currently load lanthanum in the carrier, thereby reducing the agglomeration of lanthanum nanoparticles and strengthening their contact and adsorption of phosphate. The carrier particle size is small and the porosity is large, which is conducive to the loading of lanthanum-containing materials on its surface at the nano...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/10
CPCB01J20/0207B01J20/0277B01J20/20C02F1/285C02F2101/105
Inventor 袁鹏魏燕富邓亮亮刘冬陈繁荣
Owner GUANGZHOU INST OF GEOCHEMISTRY - CHINESE ACAD OF SCI
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