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Magnetic cobalt carbon attapulgite composite material and its preparation method and application

A technology of attapulgite and composite materials, applied in the preparation of organic compounds, preparation of aminohydroxy compounds, chemical instruments and methods, etc., can solve problems such as waste of attapulgite resources, secondary pollution, secondary pollution of water bodies, etc. Good catalytic hydrogenation performance, enhanced stability, and the effect of increasing adsorption capacity

Active Publication Date: 2020-07-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In natural attapulgite, attapulgite crystals and natural pores are filled with carbonate cement, which leads to the aggregation of crystal particles, making its pore structure, surface morphology and crystal packing state in an irregular state, which weakens its overall structure. Physical and chemical properties, thus affecting the adsorption performance of attapulgite
Moreover, attapulgite exhibits excellent colloidal stability in the water suspension system, which makes it difficult to separate the saturated attapulgite from water, resulting in waste of attapulgite resources and secondary pollution to water bodies
The separation method of dye wastewater treatment is usually to add flocculant in industrial tests, which brings about the problem of high water treatment cost and a large amount of sludge that is difficult to handle
[0003] Chinese patent 200610038912.3 discloses a preparation method of ferric salt hydrolysis of magnetic particles-attapulgite nanocomposites, in which nano-maghemite particles are loaded on the surface of attapulgite, which solves the problem of solid-liquid separation due to the fine attapulgite particles difficulties and immobilization problems, however, the adsorption effect of the nanocomposite has yet to be improved
However, the saturated attapulgite / carbon composites are difficult to separate from water and easily cause secondary pollution

Method used

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  • Magnetic cobalt carbon attapulgite composite material and its preparation method and application
  • Magnetic cobalt carbon attapulgite composite material and its preparation method and application
  • Magnetic cobalt carbon attapulgite composite material and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of cobalt carbon attapulgite composite materials.

[0036] Step a: Modification of raw ore attapulgite: 1) Purification: first, sieve the raw ore attapulgite with a 150-mesh sieve to obtain attapulgite raw ore powder (Pal powder) for later use; weigh 5.0g of the sieved Pal powder+ 2.0g NH 4 Cl+1.0g NaCl in a 500mL beaker, then add 232.0mL deionized water+11.0mL concentrated HNO 3 +7.0mL concentrated H 2 SO 4 Stir vigorously for 4 hours; after stirring, immerse for 0.5 hours, pour out the upper liquid, and only filter the lower part, wash with absolute ethanol and deionized water until neutral, and finally dry at 80°C; 2) Surface activation and production Hole: acidify the above dried sample with 250.0mL of HCl solution with a concentration of 5mol / L for 2 hours, filter with suction after acidification, wash with absolute ethanol and deionized water until neutral, and finally place in an oven Dry at 80°C.

[0037] Step b: Preparation of glucose-modif...

Embodiment 2

[0049] (1) Preparation of cobalt carbon attapulgite composite materials.

[0050] Step a: Same as Example 1.

[0051] Step b: Preparation of glucose-modified attapulgite precursor: namely, the surface of modified attapulgite adsorbs carbon source, weigh 3.0g of modified attapulgite and 0.75g of glucose into a 500mL beaker, add 40.0mL of deionized water and continue Stir for 24 hours, and then place in a water bath at 80° C. until the water evaporates to prepare a precursor.

[0052] Step c: Put the precursor in a tube furnace with a helium gas flow rate of 40mL / min, a heating rate of 10°C / min, and roast at 700°C for 4h to obtain Pal@C.

[0053] Step d: Weigh 5.0g of the carbon-coated attapulgite composite into a polytetrafluoroethylene cup, then add 5.0mL of 40wt% HF, then add 45.0mL of water, react and etch for 6 hours at room temperature, and then carry out suction filtration. The product obtained after suction filtration was stirred and reacted with 60.0 mL concentrated H...

Embodiment 3

[0059] (1) Preparation of cobalt carbon attapulgite composite materials.

[0060] Step a: Same as Example 1.

[0061] Step b: Preparation of glucose-modified attapulgite precursor: namely, the surface of modified attapulgite adsorbs carbon source, weigh 3.0g modified attapulgite and 3.0g glucose into a 500mL beaker, add 40.0mL deionized water and continue Stir for 24 hours, and then place in a water bath at 80° C. until the water evaporates to prepare a precursor.

[0062] Step c: Put the precursor in a tube furnace with a nitrogen gas flow rate of 40mL / min, a heating rate of 8°C / min, and roast at 900°C for 2.5h to obtain Pal@C.

[0063] Step d: Weigh 5.0g of carbon-coated attapulgite composite into a polytetrafluoroethylene cup, then add 5.0mL of 40wt% HF, then add 45.0mL of water, react and etch at room temperature for 10h, and then carry out suction filtration. The product obtained after suction filtration was stirred and reacted with 6.0 mL concentrated HCl at 30°C for 1...

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Abstract

The invention provides a magnetic cobalt, carbon and attapulgite composite material, and a preparation method and an application thereof. The composite material is a multilayer structure with attapulgite as a carrier, the surface of the carrier is coated with a carbon nanotube layer, pores in the nanotube layer and pores in the attapulgite are filled with cobalt nanoparticles, and the surface of the carbon nanotube layer is coated with a cobalt nanoparticle layer. The preparation method comprises the following steps: acidifying attapulgite to obtain modified attapulgite; carrying out carbon source adsorption on the modified attapulgite, and calcining and etching the treated modified attapulgite to obtain porous carbon coated attapulgite; and adding a cobalt chloride solution and a sodium borohydride solution to the porous carbon coated attapulgite, performing a sufficient reaction, and drying the obtained reaction product to obtain the magnetic cobalt, carbon and attapulgite compositematerial. When the composite material is applied to the adsorption of Congo red in dye wastewater, the maximum equilibrium adsorption capacity can reach 459 mg / g; and when the composite material is applied to the hydrogenation of p-nitrophenol, the hydrogenation of p-nitrophenol is completed within 8 min.

Description

technical field [0001] The invention relates to the technical field of nano-composite materials, in particular to a magnetic cobalt-carbon attapulgite composite material and its preparation method and application. Background technique [0002] Attapulgite is a hydrous magnesium aluminum silicate mineral with a chain layer structure. It has a unique nanopore structure and a large specific surface area, so it is often used to adsorb and remove heavy metals and cationic pollutants in water. In natural attapulgite, attapulgite crystals and natural pores are filled with carbonate cement, which leads to the aggregation of crystal particles, making its pore structure, surface morphology and crystal packing state in an irregular state, which weakens its overall structure. The physical and chemical properties, thus affecting the adsorption performance of attapulgite. Moreover, attapulgite exhibits excellent colloidal stability in the water suspension system, which makes it difficult...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28B01J23/75C07C213/02C07C215/76C02F101/30
Inventor 唐爱东钟来富
Owner CENT SOUTH UNIV
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