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

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...

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 mainly prepared by chemically modifying graphene oxide, and chemical modification often involves the use of organic solvents and chemical agents, which increases the cost of preparation, and may be exposed to toxic and harmful leakage. material risk

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