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Ca-supported magnetic carbon nanotube composite material and preparation method and application thereof

A technology of magnetic carbon nanotubes and composite materials, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve problems such as difficult recovery, poor humic acid removal effect, serious carbon nanotube agglomeration, etc., to achieve High removal efficiency, save separation time, and solve recovery difficulties

Active Publication Date: 2015-11-18
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of poor humic acid removal effect, serious carbon nanotube agglomeration, and difficult recovery, and provide a new type of negative Ca-negative magnetic carbon nanotube composite material that can efficiently remove low-concentration humic acid and can be recycled and regenerated

Method used

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  • Ca-supported magnetic carbon nanotube composite material and preparation method and application thereof
  • Ca-supported magnetic carbon nanotube composite material and preparation method and application thereof
  • Ca-supported magnetic carbon nanotube composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Step 1: Fe generated by carbon nanotubes and theory 3 o 4 The mass ratio is 5:2, the molar ratio of divalent and ferric iron M 2+ / M 3+ Weigh carbon nanotubes, (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH 4 Fe(SO 4 ) 2 12H 2 O, according to the mass concentration of carbon nanotubes in distilled water is 1.5g / L will weigh the gained (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH4 Fe(SO 4 ) 2 12H 2 O was dissolved in distilled water to make a mixed iron salt solution, and then carbon nanotubes were added into the mixed iron salt solution, and dispersed by ultrasonic for 20 min.

[0040] Step 2: Press Anhydrous Na 2 CO 3 Prepare a mixed alkali solution with a molar ratio of 5:3 to NaOH.

[0041] Step 3: be 2:1 to take by weighing calcium chloride salt by carbon nanotube and anhydrous calcium chloride mass ratio, be made into calcium salt solution, the volume ratio of mixed iron salt solution, mixed lye, calcium salt solution three is 4:1:1.

[0042] Step 4: After the...

Embodiment 2

[0047] Step 1: Fe generated by carbon nanotubes and theory 3 o 4 The mass ratio is 2:1, the molar ratio of divalent and ferric iron M 2+ / M 3+ Weigh carbon nanotubes, (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH 4 Fe(SO 4 ) 2 12H 2 O, according to the mass concentration of carbon nanotubes in distilled water is 1.5g / L will weigh the gained (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH 4 Fe(SO 4 ) 2 12H 2 O was dissolved in distilled water to make a mixed iron salt solution, and then carbon nanotubes were added into the mixed iron salt solution, and dispersed by ultrasonic for 20 min.

[0048] Step 2: Press Anhydrous Na 2 CO 3 Prepare a mixed alkali solution with a molar ratio of 5:2 to NaOH.

[0049] Step 3: take by weighing calcium chloride salt according to carbon nanotube and anhydrous calcium chloride mass ratio as 1:2, be made into calcium salt solution, the volume ratio of mixed iron salt solution, mixed lye, calcium salt solution three is 4:1. 2:1.

[0050] Step ...

Embodiment 3

[0055] Step 1: Fe generated by carbon nanotubes and theory 3 o 4 The mass ratio is 5:2, the molar ratio of divalent and ferric iron M 2+ / M 3+ Weigh carbon nanotubes, (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH 4 Fe(SO 4 ) 2 12H 2 O, according to the mass concentration of carbon nanotubes in distilled water is 1.5g / L will weigh the gained (NH 4 ) 2 Fe(SO 4 ) 2 ·6H 2 O and NH 4 Fe(SO 4 ) 2 12H 2 O was dissolved in distilled water to make a mixed iron salt solution, and then carbon nanotubes were added into the mixed iron salt solution, and dispersed by ultrasonic for 20 min.

[0056] Step 2: Press Anhydrous Na 2 CO 3 Prepare a mixed alkali solution with a molar ratio of 5:4 to NaOH.

[0057] Step 3: take by weighing calcium chloride salt by carbon nanotube and anhydrous calcium chloride mass ratio as 1:1, be made into calcium salt solution, the volume ratio of mixed iron salt solution, mixed lye, calcium salt solution three is 4:0.8:1.

[0058] Step 4: After th...

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Abstract

The invention provides a Ca-supported magnetic carbon nanotube composite material and a preparation method and an application thereof. The magnetic carbon nanotube composite material is in a tubular structure, the magnetic Fe3O4 and CaCO3 nano particles are uniformly deposited on the surface of the carbon nanotube. The Ca-supported magnetic carbon nanotube composite material is prepared by coprecipitation of carbon nanotube, divalent iron, ferric iron and calcium ion by alkali, the specific surface area of the Ca-supported magnetic carbon nanotube is 139.43m<2> / g, average aperture is 11.99nm, average particle size is 43.03nm, and large specific surface area is in favor of adsorption and removal of humic acid. The prepared powder has good physical adsorption and chemical adsorption functions on the humic acid in water, and can reach the purpose of humic acid removal. when adding amount is 0.7g / L, the clearance rate of the humic acid with concentration being 20mg / L in micro-scale polluted water source can reach more than 97.2%, compared with unprocessed carbon nanotube, the clearance rate is increased by more than 30%. The method has the advantages of simple process and low cost, the morphology of the powder material is good, and the removed powder can be rapidly separated from water through an applied magnetic field.

Description

technical field [0001] The invention belongs to the field of nano functional materials, and relates to a Ca-negative magnetic carbon nanotube composite material and a preparation method and application thereof. Background technique [0002] At present, the organic substances in the water body are gradually increasing, and some organic substances exceed the sanitary standards of drinking water sources, seriously endangering human health and the ecological environment. The removal of micro-polluting organic substances has become an important issue in water supply treatment. It is the main component of micro-polluting organic matter, accounting for about 50% to 90% of the total organic matter in water. It widely exists in soil, sediment, lakes, rivers and oceans. It is formed after the decomposition of animal and plant residues by microorganisms and chemical processes. A brown or black compound. Humic acid is a strong complexing agent for trace metals, which will reduce the co...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
Inventor 李绍秀何敏旋潘志彬王志红李冬梅梅胜蒋树贤李斌
Owner GUANGDONG UNIV OF TECH
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