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Method for preparing magnetic carbon nanotube/crosslinked chitosan composite nanomaterial adsorbent

A composite nanomaterial, magnetic carbon nanotube technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, alkali metal compounds, etc. low cost effect

Inactive Publication Date: 2012-07-04
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 carbon nanotube adsorbents has disadvantages such as complicated process and inability to be used in acidic solution. Although the loaded magnetic carbon nanotubes can be recovered by magnetic separation, they still exist in the form of fine powder and still exist. Therefore, the development of new magnetic carbon nanotube adsorbents with good biocompatibility and high capacity that can be used in acidic solutions is 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

[0023] Weigh 1g of chitosan and 1g of dried carbon nanotubes, mix them and dissolve them in 100ml of dilute acetic acid solution (the mass fraction of acetic acid is 2%), stir for 20min to make them evenly mixed; add 0.6g of carbonic acid to the mixed solution Sodium hydrogen, stir until the bubbles are uniform; continue to add 25ml of formaldehyde solution, stir for 20 minutes, mix it and let it stand for 10 minutes; filter the reacted mixture, rinse it repeatedly with distilled water, pour it into the sodium hydroxide aqueous solution again, and adjust the mixture The pH value is greater than 10; add 2ml of epichlorohydrin, and react for 4 hours at 70°C; filter the reacted mixture, rinse it repeatedly with distilled water, add it to 1mol / L hydrochloric acid solution and stir for 30 minutes; use sodium hydroxide solution Wash and filter repeatedly until the pH of the solution is neutral; dry in vacuum to obtain the desired product. 30 mg of adsorbent is added to 40 mL of meth...

Embodiment 2

[0025] Weigh 1g of chitosan and 0.25g of dried carbon nanotubes, mix them and dissolve them in 100ml of dilute acetic acid solution (the mass fraction of acetic acid is 2%), stir for 20min to make it evenly mixed; add 0.6g of Sodium bicarbonate, stir until the bubbles are uniform; continue to add 25ml of formaldehyde solution, stir for 20 minutes, mix well and let stand for 10 minutes; filter the reacted mixture, rinse it repeatedly with distilled water, pour it into the sodium hydroxide aqueous solution again, and adjust the mixing The pH value of the solution is greater than 10; add 2ml of epichlorohydrin, and react for 4 hours at 70°C; filter the reacted mixture, rinse it repeatedly with distilled water, add it to 1mol / L hydrochloric acid solution and stir for 30 minutes; use sodium hydroxide The solution was repeatedly washed and filtered until the pH value of the solution was neutral; vacuum-dried to obtain the desired product. 30 mg of adsorbent is added to 40 mL of meth...

Embodiment 3

[0027]Weigh 1g of chitosan and 0.02g of dried carbon nanotubes, mix them and dissolve them in 100ml of dilute acetic acid solution (the mass fraction of acetic acid is 2%), stir for 20min to make them evenly mixed; add 0.6g of Sodium bicarbonate, stir until the bubbles are uniform; continue to add 25ml of formaldehyde solution, stir for 20 minutes, mix well and let stand for 10 minutes; filter the reacted mixture, rinse it repeatedly with distilled water, pour it into the sodium hydroxide aqueous solution again, and adjust the mixing The pH value of the solution is greater than 10; add 2ml of epichlorohydrin, and react for 4 hours at 70°C; filter the reacted mixture, rinse it repeatedly with distilled water, add it to 1mol / L hydrochloric acid solution and stir for 30 minutes; use sodium hydroxide The solution was repeatedly washed and filtered until the pH value of the solution was neutral; vacuum-dried to obtain the desired product. 30 mg of adsorbent is added to 40 mL of met...

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Abstract

The invention relates to a method for preparing magnetic carbon nanotube / crosslinked chitosan composite nanomaterial adsorbent. According to the invention, a carbon nanotube original sample is adopted as a raw material; the magnetic performance of metal catalyst particles residual in the carbon nanotube original sample and the high-efficiency selective adsorption performance of the carbon nanotube are fully utilized; the adsorption performance of the material is significantly improved through compositing with biological material chitosan; therefore, the magnetic composite nanomaterial adsorbent with high efficiency in adsorbing dye in water phase is obtained. The magnetic composite nanomaterial adsorbent obtained in the invention has the advantages that: the carbon nanotube has no need to adopt strong acid treatment so that the structural integrity of the carbon nanotube is protected; the magnetic performance of the metal catalyst particles residual in the original sample is utilized so that additional process is not needed for composition of magnetic particles; moreover, the crosslinked chitosan has good biocompatibility to benefit the toxicity reduction of nanomaterial and potential biological application; and the obtained nano composite adsorbent can be conveniently and rapidly separated and recycled by adopting magnetic separation technology, so that secondary environmental pollution 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 magnetic carbon nanotube / cross-linked chitosan composite nanomaterial adsorbent, which is used for rapid adsorption and removal of dyes in aqueous solutions, while ensuring adsorption After use, the agent powder can be separated and recovered from the aqueous solution by applying an 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 solid...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30C02F1/28C02F103/30
Inventor 马杰陈君红李芳琳苏畅汤宇航袁志文
Owner TONGJI UNIV
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