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Nano FeS particle composite material as well as preparation method and application thereof
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A technology of composite materials and particles, which is applied in the field of nanomaterials, can solve the problems of decreased activity of nanoparticles, hindered application, troublesome application, etc., and achieves the effects of simple preparation method, good oxidation resistance and convenient operation
Active Publication Date: 2021-07-16
SOUTH CHINA AGRI UNIV +1
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[0003] The application effect of nano-FeS in the adsorption of heavy metals in the environment is excellent, but due to its easy aggregation and oxidation characteristics, its use is hindered, and it can only be used in an anaerobic environment, and it cannot take advantage of its high adsorption activity.
[0004] Nowadays, there are many ways to disperse nanoparticles, and solid loading is the most common one. Due to the relatively low loading capacity, and the loading is not firm and easy to fall off, it is not widely used; the use of polymers as dispersants can play a very good role. Dispersed, but it will cover the active sites of nanoparticles, resulting in a decrease in the activity of nanoparticles and hindering the application
The anti-oxidation methods of nanoparticles, especially FeS nanoparticles, are relatively limited. They are only stored in an oxygen-free environment, and the application is troublesome.
Method used
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Embodiment 1
[0050] (1) Dissolve 2g of acrylamide in 30mL of water, add 5g of ferricchloride, stir well, mix evenly, then add 5g of sodium lignosulfonate, stir until completely dissolved, and finally add 2mL with a concentration of 1% (w / v) Polyvinyl alcohol (average molecular weight 110000) solution, stirring and mixing;
[0051] (2) Add 0.1g initiator potassiumpersulfate to the solution obtained in step (1), stir for 1h, mix well, leave standstill until it becomes a gel, rinse with water, and freeze dry for subsequent use;
[0052] (3) Soak the xerogel prepared in step (2) in 200mL aqueous solution dissolved with 0.01mol / L (final concentration) sodiumborohydride and 0.5mol / L (final concentration) sodium sulfide for 2 hours, separate After rinsing and freeze-drying, the dispersed nano-FeS particle composite material is obtained.
Embodiment 2
[0054] (1) Dissolve 3g of acrylamide in 30mL of water, add 8g of ferricchloride, stir well, mix evenly, then add 7g of sodium lignosulfonate, stir until completely dissolved, and finally add 3mL with a concentration of 3% (w / v) Polyvinyl alcohol (average molecular weight 120000) solution, stirring and mixing;
[0055](2) Add 0.1g initiator potassiumpersulfate to the solution obtained in step (1), stir for 1h, mix well, leave standstill until it becomes a gel, rinse with water, and freeze dry for subsequent use;
[0056] (3) Soak the xerogel prepared in step (2) in 200mL aqueous solution dissolved with 0.01mol / L (final concentration) sodium borohydride and 0.5mol / L (final concentration) sodium sulfide for 2 hours, separate After rinsing and freeze-drying, the dispersed nano-FeS particle composite material is obtained.
Embodiment 3
[0058] (1) Dissolve 5g of acrylamide in 30mL of water, add 10g of ferricchloride, stir well, mix well, then add 10g of sodium lignosulfonate, stir until completely dissolved, and finally add 5mL with a concentration of 4% (w / v) Polyvinyl alcohol (average molecular weight 130000) solution, stirring and mixing;
[0059] (2) Add 0.1g initiator potassiumpersulfate to the solution obtained in step (1), stir for 1h, mix well, leave standstill until it becomes a gel, rinse with water, and freeze dry for subsequent use;
[0060] (3) Soak the xerogel prepared in step (2) in 200mL aqueous solution dissolved with 0.01mol / L (final concentration) sodium borohydride and 0.5mol / L (final concentration) sodium sulfide for 2 hours, separate After rinsing and freeze-drying, the dispersed nano-FeS particle composite material is obtained.
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Abstract
The invention provides a nano FeS particle composite material as well as a preparation method and application thereof. According to the invention, acrylamide, sodiumligninsulfonate and polyvinyl alcohol are used for cross-linking an interpenetrating network to form hydrogel with an internal anaerobic space, and FeS nano particles are synthesized in the hydrogel by means of in-situ loading and in-situ reduction, so that dispersion of nano FeS is realized, and the nano FeS is effectively prevented from being oxidized; and the preparation method is simple, does not need an additional cross-linking agent, and is convenient to operate. FeS particles in the nano FeS particle composite material obtained by the preparation method are high in dispersity, strong in oxidation resistance and easy to store, active sites are effectively maintained, and the removal effect on Cr (VI) is remarkable; and the composite material is convenient to use and good in applicability, and has a good application prospect in the field of heavy metal removal.
Description
technical field [0001] The invention belongs to the technical field of nanometer materials, and relates to a nanometer FeS particle composite material and its preparation method and application; in particular, it relates to a composite material capable of realizing high dispersion of nanometer particles with hydrogel, and its preparation and application. Background technique [0002] Nanomaterials refer to particles with a structural unit size of 1 to 100 nm; due to their small size, their properties will change greatly. Moreover, because its scale is close to the wavelength of light and has a special effect of a large specific surface, it is often different from the properties of the substance in the bulk state, such as melting point, optics, thermal conductivity, magnetism, and electrical conductivity. [0003] Nano-FeS has an excellent application effect in the adsorption of heavy metals in the environment, but its use is hindered due to its easy agglomeration and oxidati...
Claims
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