A negative ca magnetic carbon nanotube composite material and its preparation method and application

A technology of magnetic carbon nanotubes and composite materials, applied in chemical instruments and methods, alkali metal compounds, other chemical processes, etc., can solve the problems of serious agglomeration of carbon nanotubes, poor removal of humic acid, and difficulty in recycling, etc. The effect of saving separation time, convenient implementation and high removal efficiency

Active Publication Date: 2018-06-29
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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  • A negative ca magnetic carbon nanotube composite material and its preparation method and application
  • A negative ca magnetic carbon nanotube composite material and its preparation method and application
  • A negative ca magnetic carbon nanotube composite material and its preparation method and application

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 ·6H2 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.

[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 t...

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] Ste...

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 ...

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Abstract

The invention provides a Ca-negative magnetic carbon nanotube composite material and a preparation method and application thereof. The magnetic carbon nanotube composite material has a tubular structure, and magnetic Fe3O4 and CaCO3 nanoparticles are evenly deposited on the surface of the carbon nanotube. The present invention is prepared by co-precipitating carbon nanotubes with ferrous iron, ferric iron and calcium ions with alkali, and the prepared negative Ca magnetic carbon nanotubes have a specific surface area of ​​139.43m2 / g, an average pore diameter of 11.99nm, and an average The particle size is 43.03nm, and the large specific surface area is conducive to the adsorption and removal of humic acid. The prepared powder has better physical adsorption and chemical adsorption functions for humic acid in water, and achieves the purpose of removing humic acid. When the dosage is 0.7g / L, the removal rate of humic acid with a concentration of 20mg / L in slightly polluted water sources is over 97.2%, which is more than 30% higher than that of untreated original carbon nanotubes. The preparation method of the invention is simple and low in cost, and the obtained powder material has good appearance, and the removed powder can be quickly separated from water by an external 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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Patent Type & Authority Patents(China)
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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