Carbon-coated ferroferric oxide core-shell nano particle and preparation method thereof

Abstract

The invention discloses carbon-coated ferroferric oxide core-shell nano particles and a preparation method thereof and belongs to the technical field of preparation of nano material. Deionized water is employed as a solvent; ammonia water is employed as a co-precipitation agent; and a soluble ferric salt and a soluble monosaccharide, or soluble polysaccharide, are employed as raw materials. The deionized water, the ammonia water, the soluble ferric salt and the soluble monosaccharide, or the soluble polysaccharide, are mixed together to form a homogeneous suspension liquid. The homogeneous suspension liquid, which is a mixture system, is transferred into a polytetrafluoroethylene inner liner having a stainless steel substrate. The mixture system is subjected to a reaction in a drying oven at 120-220 DEG C for 5-15 hours after the inner liner being sealed to obtain the carbon-coated ferroferric oxide core-shell particles. Particle sizes of the nano particles are 5-7 nm. The preparation method is easy, is low in cost and is free of environmental pollution. The nano particles prepared through the method have a good effect of adsorbing an organic dye and can be used in the technical fields of biological technology, medicine and anode materials of lithium ion batteries, and especially in the technical field of sewage treatment.

Description

technical field

[0001] The invention belongs to the field of preparation of nanometer materials, and in particular relates to a preparation method of a core-shell material, in particular to a preparation method of one-step hydrothermal synthesis of highly adsorbable carbon-coated ferric iron tetroxide core-shell nanoparticles. Background technique

[0002] With the development of printing and dyeing industry and food industry, dye wastewater has become one of the important pollution of water environment. Many of these dyes are very stable in the environment and are difficult to break down through photodegradation, biodegradation and oxidation. However, adsorption technology has become a better choice in purifying sewage. Ferroferric oxide magnetic nanoparticles can be used as a dye adsorbent due to their unique magnetic properties, chemical stability, high magnetic separation efficiency, low cost, and easy modification. However, its poor stability and easy agglomeration ma...

Examples

Embodiment 1

[0021] 12.0 g FeCl 3 ·6H 2 O and 6.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL deionized water, stir until it is completely mixed, then add 6.0 g of glucose and wait for it to dissolve completely, slowly add 10 g of ammonia water to the above solution while stirring to make it evenly mixed, and transfer to the polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle for 10 hours at 180° C. to react for 10 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles. The transmission electron microscope photographs of the prepared materials are as follows: figure 1 It can be seen that the particle size distribution of ions is relatively uniform. The XRD spectrum of the prepared material is as follows figure 2 As shown, the crystallinity is better. The hysteresis curves of the prepared materials are as follows image 3 As shown, the saturation magnetization is 44.1 emu / ...

Embodiment 2

[0023] 6.0 g FeCl 3 ·6H 2 O and 3.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL of deionized water, stir until it is completely mixed, then add 1.125 g of glucose and wait for it to dissolve completely, then slowly add 3.6 g of ammonia water into the above solution while stirring to make it evenly mixed, and transfer it to a polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 220° C. for 15 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles.

Embodiment 3

[0025] 8.0 g Fe 2 (SO 4 ) 3 9H 2 O and 4.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL of deionized water, stir until it is completely mixed, then add 6.0 g of lactose and wait for it to completely dissolve, then slowly add 7.5 g of ammonia water into the above solution while stirring to make it evenly mixed, and transfer it to a polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 150°C for 8 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles.

technical field

[0001] The invention belongs to the field of preparation of nanometer materials, and in particular relates to a preparation method of a core-shell material, in particular to a preparation method of one-step hydrothermal synthesis of highly adsorbable carbon-coated ferric iron tetroxide core-shell nanoparticles. Background technique

[0002] With the development of printing and dyeing industry and food industry, dye wastewater has become one of the important pollution of water environment. Many of these dyes are very stable in the environment and are difficult to break down through photodegradation, biodegradation and oxidation. However, adsorption technology has become a better choice in purifying sewage. Ferroferric oxide magnetic nanoparticles can be used as a dye adsorbent due to their unique magnetic properties, chemical stability, high magnetic separation efficiency, low cost, and easy modification. However, its poor stability and easy agglomeration ma...

Examples

Embodiment 1

[0021] 12.0 g FeCl 3 ·6H 2 O and 6.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL deionized water, stir until it is completely mixed, then add 6.0 g of glucose and wait for it to dissolve completely, slowly add 10 g of ammonia water to the above solution while stirring to make it evenly mixed, and transfer to the polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle for 10 hours at 180° C. to react for 10 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles. The transmission electron microscope photographs of the prepared materials are as follows: figure 1 It can be seen that the particle size distribution of ions is relatively uniform. The XRD spectrum of the prepared material is as follows figure 2 As shown, the crystallinity is better. The hysteresis curves of the prepared materials are as follows image 3 As shown, the saturation magnetization is 44.1 emu / ...

Embodiment 2

[0023] 6.0 g FeCl 3 ·6H 2 O and 3.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL of deionized water, stir until it is completely mixed, then add 1.125 g of glucose and wait for it to dissolve completely, then slowly add 3.6 g of ammonia water into the above solution while stirring to make it evenly mixed, and transfer it to a polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 220° C. for 15 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles.

Embodiment 3

[0025] 8.0 g Fe 2 (SO 4 ) 3 9H 2 O and 4.0 g FeSO 4 ·7H 2 Add the mixture of O to 50 mL of deionized water, stir until it is completely mixed, then add 6.0 g of lactose and wait for it to completely dissolve, then slowly add 7.5 g of ammonia water into the above solution while stirring to make it evenly mixed, and transfer it to a polytetrafluoroethylene In the ethylene liner, put the sealed polytetrafluoroethylene liner into a hydrothermal kettle at 150°C for 8 hours, cool to room temperature, wash, and dry to obtain carbon-coated ferric oxide nanoparticles.

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