A method for liquid phase exfoliation of natural pyrite to prepare nanometer ultrafine powder

An ultra-fine powder, liquid phase exfoliation technology, applied in nanotechnology, iron sulfide and other directions, to achieve the effect of good crystallinity, stable structure and mild conditions

Inactive Publication Date: 2017-08-04
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the above-mentioned technical problems, there is no report on the preparation of nanometer ultrafine powder from natural pyrite by liquid phase exfoliation.

Method used

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  • A method for liquid phase exfoliation of natural pyrite to prepare nanometer ultrafine powder
  • A method for liquid phase exfoliation of natural pyrite to prepare nanometer ultrafine powder
  • A method for liquid phase exfoliation of natural pyrite to prepare nanometer ultrafine powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Accurately weigh 0.20g of pyrite fine sand and put it into a 250mL three-neck flask containing 100mL of 0.5% polyacrylic acid stripping solution. Ultrasonic treatment was carried out for 5 minutes, and after continuous peeling reaction for 4 hours, the reaction was stopped and the processed product was subjected to low-speed centrifugation to separate slag and ultrafine powder.

[0024] The obtained slag and ultrafine powder were washed with 30 mL of deionized water respectively, placed in an ultrasonic cleaner to disperse and wash the polyacrylic acid molecules attached to the surface of the sample after being shaken vigorously for several times, and the liquid was poured into a centrifuge tube for centrifugation ( 8500r / min, 1min), discard the liquid, and repeat this 4 times; add 30mL of absolute ethanol, ultrasonically wash with an ultrasonic cleaner, centrifuge at 8500r / min for 1min, discard the liquid, and repeat this 2 times; The body was dried in an oven at 60°C ...

Embodiment 2

[0026] Accurately weigh 0.20g of pyrite fine sand and put it into a 250mL three-necked flask containing 100mL of 0.5% polyacrylic acid stripping solution. Ultrasonic treatment is carried out for 10 minutes, and after continuous stripping reaction for 8 hours, the reaction is stopped and the processed product is subjected to low-speed centrifugation to separate slag and ultrafine powder.

[0027] The obtained slag and ultrafine powder were washed with 30 mL of deionized water respectively, placed in an ultrasonic cleaner to disperse and wash the polyacrylic acid molecules attached to the surface of the sample after being shaken vigorously for several times, and the liquid was poured into a centrifuge tube for centrifugation ( 8500r / min, 1min), discard the liquid, and repeat this 4 times; add 30mL of absolute ethanol, ultrasonically wash with an ultrasonic cleaner, centrifuge at 8500r / min for 1min, discard the liquid, and repeat this 2 times; The body was dried in an oven at 60°...

Embodiment 3

[0029] Accurately weigh 0.20g of pyrite fine sand and put it into a 250mL three-necked flask containing 100mL of 0.5% polyacrylic acid stripping solution. Ultrasonic treatment was carried out for 25 minutes, and after continuous stripping reaction for 36 hours, the reaction was stopped and the processed product was subjected to low-speed centrifugation to separate slag and ultrafine powder.

[0030] The obtained slag and ultrafine powder were washed with 30 mL of deionized water respectively, placed in an ultrasonic cleaner to disperse and wash the polyacrylic acid molecules attached to the surface of the sample after being shaken vigorously for several times, and the liquid was poured into a centrifuge tube for centrifugation ( 8500r / min, 1min), discard the liquid, and repeat this 4 times; add 30mL of absolute ethanol, ultrasonically wash with an ultrasonic cleaner, centrifuge at 8500r / min for 1min, discard the liquid, and repeat this 2 times; The body was dried in an oven at...

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Abstract

The invention discloses a method for preparing nano ultrafine powder through liquid phase stripping of natural pyrite. Natural pyrite fine sand is put in stripping liquid containing polyacrylic acid and / or sodium polyacrylate, under the intermittent ultrasonic treatment condition, a system is put in the environment of the temperature of 50-110 DEG C for stirring and stripping, the stripping liquid is separated and recycled after treatment is completed, slag is filtered out, the stripped fine powder is centrifuged, washed and dried, and the natural pyrite nano ultrafine powder with high purity is obtained. Meanwhile, the stripping liquid and the slag can be recycled, the repeated utilization rate of the stripping liquid is high, and stable dispersion performance is shown. The conversion rate of the method reaches 88.6% to the maximum degree, the process is simple and economical, conditions are mild, the size of the obtained nano ultrafine powder ranges from 100 nm to 300 nm, the lamellar stable structure feature is shown, the nano ultrafine powder can be directly applied to the fields of electrochemistry, catalysis, adsorption and the like, and high practical application value is achieved.

Description

technical field [0001] The invention relates to a method for preparing nano ultrafine powder by stripping natural pyrite in liquid phase, in particular to a method for preparing nano ultrafine powder by stripping natural pyrite by using polyacrylic acid and / or sodium polyacrylate stripping liquid. Background technique [0002] The main chemical composition of pyrite is FeS 2 , whose crystals belong to the sulfide minerals of the equiaxed crystal system, and are widely distributed in the earth's crust. FeS 2 It has the characteristics of large capacity, environmental protection, and wide voltage platform, and can be used as the positive electrode material of lithium-iron disulfide battery; FeS 2 It also has excellent optical properties and a small band gap, and can be used in solar cells; pyrite can also be used in the field of wastewater adsorption treatment, but because of its large particles, small specific surface area, low chemical activity, and reaction Slow rate, lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/12B82Y40/00
CPCC01G49/12C01P2002/72C01P2004/03C01P2004/04C01P2004/62
Inventor 刘孝恒王伟伟沈志潘俊杰罗洁李浩林朱丹
Owner NANJING UNIV OF SCI & TECH
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