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Preparation method of novel magnetically separable absorbent for removing dye

A magnetic separation and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc. Achieve the effects of stable performance, simple preparation process, good adsorption and enrichment characteristics

Inactive Publication Date: 2011-09-14
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of traditional magnetic iron oxide / carbon nanotube hybrid material adsorbents has disadvantages such as complicated process and inability to be used in acidic environments. The existence of the above problems affects and limits the further development and application of magnetic carbon nanotube adsorbents. Therefore, the development of New high-capacity magnetic carbon nanotube adsorbents that can be used in acidic environments are of great significance to reduce the cost of adsorbents, increase adsorption capacity, prolong life, and promote practical promotion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Carbon nanotubes were prepared by floating catalytic pyrolysis, using ethanol (CH 3 CH 2 OH) as carbon source and solvent, ferrocene ((C 5 h 5 ) 2 Fe) as a catalyst, thiophene (C 4 h 4 S) as an additive, argon as a protective gas and a carrier gas; the catalyst ferrocene is dissolved in solvent ethanol, the concentration of the control catalyst is 18-22g / L, the concentration of thiophene is 0.8-1.2% (Vol), argon The flow rate is controlled at 85-95 L / h. During the reaction, the high-temperature electric furnace first raises the temperature at a rate of 20°C / s to the reaction temperature of 1100°C; then the ethanol solution dissolved with ferrocene is passed into the high-temperature electric furnace, and The carrier gas argon enters the reaction zone, and the ferrocene decomposes at high temperature to form metal iron particles, and the carbon source is catalyzed and decomposed under the action of the catalyst metal iron particles, which provides the carbon source...

Embodiment 2

[0026] Carbon nanotubes were prepared by floating catalytic pyrolysis, using ethanol (CH 3 CH 2 OH) as carbon source and solvent, ferrocene ((C 5 h 5 ) 2 Fe) as a catalyst, thiophene (C 4 h 4S) as an additive, argon as a protective gas and a carrier gas; the catalyst ferrocene is dissolved in solvent ethanol, the concentration of the control catalyst is 18-22g / L, the concentration of thiophene is 0.8-1.2% (Vol), argon The flow rate is controlled at 85-95 L / h. During the reaction, the high-temperature electric furnace first raises the temperature at a rate of 20°C / s to the reaction temperature of 1100°C; then the ethanol solution dissolved with ferrocene is passed into the high-temperature electric furnace, and The carrier gas argon enters the reaction zone, and the ferrocene decomposes at high temperature to form metal iron particles, and the carbon source is catalyzed and decomposed under the action of the catalyst metal iron particles, which provides the carbon source ...

Embodiment 3

[0028] Carbon nanotubes were prepared by floating catalytic pyrolysis, using ethanol (CH 3 CH 2 OH) as carbon source and solvent, ferrocene ((C 5 h 5 ) 2 Fe) as a catalyst, thiophene (C 4 h 4 S) as an additive, argon as a protective gas and a carrier gas; the catalyst ferrocene is dissolved in solvent ethanol, the concentration of the control catalyst is 18-22g / L, the concentration of thiophene is 0.8-1.2% (Vol), argon The flow rate is controlled at 85-95 L / h. During the reaction, the high-temperature electric furnace first raises the temperature at a rate of 20°C / s to the reaction temperature of 1100°C; then the ethanol solution dissolved with ferrocene is passed into the high-temperature electric furnace, and The carrier gas argon enters the reaction zone, and the ferrocene decomposes at high temperature to form metal iron particles, and the carbon source is catalyzed and decomposed under the action of the catalyst metal iron particles, which provides the carbon source...

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Abstract

The invention belongs to the technical field of environmental new functional nano materials, in particular relates to a preparation method of a novel magnetically separable absorbent for removing dye, comprising the following concrete steps of: ultrasonically dispersing a primary carbon nano tube sample in distilled water by adopting a chemical vapor deposition method; adding a certain quantity of oxidizing solution, and placing the solution in a magnetic stirrer for refluxing at a certain temperature for several hours; and filtering the modified magnetic carbon nano tube sample, washing with water, and vacuum drying to obtain a magnetic carbon nano tube composite absorbent. In the magnetic carbon nano tube composite absorbent obtained in the invention, the outer layer of a metal catalyst particle used for magnetically separating is coated with a carbon layer with better graphitization, which is used for effectively protecting the metal catalyst particle so that the service life of a catalyst is prolonged, meanwhile, the composite absorbent can be stably used under an acidic condition. The invention has the advantages of simple preparation process, easiness in condition control and stable property; the structural structure of the carbon nano tube is modified by adopting the oxidizing solution, thus, the hydrophobicity of the carbon nano tube is improved, and the dispersion property of the carbon nano tube in the solution is improved; and the absorbent can be rapidly and conveniently separated and recycled by adopting a magnetic separating technology, therefore, secondary pollution to the environment is avoided.

Description

technical field [0001] The invention belongs to the technical field of environmental nano-new functional materials, and specifically relates to a preparation method of a novel adsorbent capable of magnetically separating dyes. Separation and recovery from aqueous solution by external magnetic field. Background technique [0002] With the rapid development of my country's printing and dyeing industry and chemical industry, about 600-700 million tons of printing and dyeing wastewater are discharged into the environment every year, and dye wastewater has become one of the key sources of environmental pollution. The dye industry has a variety of varieties and complex processes. Dye wastewater has the characteristics of complex components, high chroma, high COD and BOD concentrations, high suspended solids, large changes in water quality and water volume, and many refractory substances. It is one of the more difficult industrial wastewater to treat. one. Azo dyes are the most w...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28
Inventor 马杰虞琳琳袁志文陈君红
Owner TONGJI UNIV
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