Graphene/ polyvinyl alcohol nanofibers membrane adsorbent, preparation method and appliance

A technology of nanofiber membrane and polyvinyl alcohol, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problems of easy dispersion, increase of preparation cost, leakage of toxic and harmful substances, etc., and achieve specific surface area Larger, shorten the adsorption equilibrium time, and the effect of environmental protection in the preparation process

Inactive Publication Date: 2016-02-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since graphene oxide is a nanoscale substance, it is easy to disperse in aqueous solution, and it is difficult to separate and reuse the adsorbed graphene oxide.
At present, graphene-based composite materials with separation ability are mai

Method used

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  • Graphene/ polyvinyl alcohol nanofibers membrane adsorbent, preparation method and appliance
  • Graphene/ polyvinyl alcohol nanofibers membrane adsorbent, preparation method and appliance
  • Graphene/ polyvinyl alcohol nanofibers membrane adsorbent, preparation method and appliance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of electrospinning nanofiber membrane that adsorbs heavy metal ions includes the following operation steps:

[0027] (1) Add 12 mg of graphene oxide to 5 g of deionized water, and after ultrasonic treatment for 0.5 h, a uniformly dispersed graphene oxide solution is obtained;

[0028] (2) Add 1.2 g of polyvinyl alcohol to 10 g of deionized water, heat the solution to 88° C., dissolve for 3 hours, and cool to room temperature to obtain a polyvinyl alcohol solution;

[0029] (3) The graphene oxide aqueous solution and the polyvinyl alcohol solution are mixed, and then stirred for 0.5 h at a stirring speed of 100 revolutions / min to obtain a spinning solution of graphene oxide and polyvinyl alcohol. The spinning solution contains polyethylene The mass fraction of alcohol is 8wt%;

[0030] (4) The above-mentioned spinning stock solution is added to the electrospinning equipment for spinning to obtain graphene oxide and polyvinyl alcohol nanofiber membrane. Elect...

Embodiment 2

[0035] A preparation method of electrospinning nanofiber membrane that adsorbs heavy metal ions includes the following operation steps:

[0036] (1) Adding 84 mg of graphene oxide to 5 g of deionized water, and ultrasonic treatment for 1 hour to obtain a uniformly dispersed graphene oxide solution;

[0037] (2) Add 1.2 g of polyvinyl alcohol to 10 g of deionized water, heat the solution to 92°C, dissolve for 3 hours, and cool to room temperature to obtain a polyvinyl alcohol solution;

[0038] (3) Mix the graphene oxide aqueous solution and the polyvinyl alcohol solution, and then stir for 3 hours at a stirring speed of 150 revolutions / min to obtain a spinning solution of graphene oxide and polyvinyl alcohol. The spinning solution contains polyvinyl alcohol. The mass fraction of is 8wt%;

[0039] (4) The above-mentioned spinning stock solution is added to the electrospinning equipment for spinning to obtain graphene oxide and polyvinyl alcohol nanofiber membrane. The electrospinning c...

Embodiment 3

[0044] A preparation method of electrospinning nanofiber membrane that adsorbs heavy metal ions includes the following operation steps:

[0045] (1) Add 120 mg of graphene oxide to 5 g of deionized water, and after ultrasonic treatment for 3 hours, obtain a uniformly dispersed graphene oxide solution;

[0046] (2) Add 1.2 g of polyvinyl alcohol to 10 g of deionized water, heat the solution to 95° C., dissolve for 3.5 hours, and cool to room temperature to obtain a polyvinyl alcohol solution;

[0047] (3) Mix the graphene oxide aqueous solution and the polyvinyl alcohol solution, and then stir for 5 hours at a stirring speed of 250 revolutions / min to obtain a spinning solution of graphene oxide and polyvinyl alcohol. The spinning solution contains polyvinyl alcohol. The mass fraction of is 8wt%;

[0048] (4) The above-mentioned spinning stock solution is added to the electrospinning equipment for spinning to obtain graphene oxide and polyvinyl alcohol nanofiber membrane. The electrospi...

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Abstract

The invention discloses a graphene/ polyvinyl alcohol nanofibers membrane adsorbent, a preparation method and an appliance, which comprise steps: (1) graphene oxide is added into deionized water, and obtains graphene oxide solution which is uniformly dispersed in ultrasound for 0.5-4h; (2) polyving akohol is added into the deionized water, the graphene oxide solution is heated to 40-100 DEGC to dissolve, and is cooled to the room temperature, thereby obtaining a polyving akohol solution; (3) the graphene oxide solution and the polyving akohol solution are mixed and stirred to obtain a spinning solution; (4) the spinning solution is electrostatically spun to obtain graphene oxide and polyvinyl alcohol nanofibers membranes; and (5) the graphene oxide and polyvinyl alcohol nanofibers membranes are frozen and dried to obtain graphene/ polyvinyl alcohol nanofibers membrane adsorbent. A prepared nanofibers membrane has large specific surface area and high porosity, can increase contact area with heavy metal ions, improves adsorption capacity, reduces adsorption equilibrium time, and can effectively adsorb the heavy metal ions in waste water.

Description

Technical field [0001] The invention belongs to the field of adsorption materials, and particularly relates to an electrostatic spinning nanofiber membrane adsorbent capable of efficiently adsorbing heavy metal ions. Background technique [0002] With the rapid development of my country's economy and society, population growth, industrialization and the acceleration of urban dialects, industries involving heavy metals are maintaining a strong growth momentum, and heavy metal pollution incidents occur frequently. Because heavy metals are highly toxic and cannot be biodegraded, they can accumulate in animals and plants through the food chain, and finally stay in the environment and human body, causing serious harm to the ecological environment and human health. [0003] There are many methods to remove heavy metal ions. The traditional methods include chemical precipitation, membrane separation, ion exchange resin, electrochemical, redox, etc. However, these methods have large invest...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F101/20
Inventor 胡勇有谭平谭晓君
Owner SOUTH CHINA UNIV OF TECH
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