Graphene-based heavy metal ion adsorption material and preparation method thereof

Abstract

The invention belongs to the field of environmental protection materials and particularly relates to a graphene-based heavy metal ion adsorption material and a preparation method thereof. Polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan as raw materials are doped with nitrogen-doped graphene and the mixture is cross-linked to form the heavy metal ion adsorption material utilizing a polymer material as a skeleton and enhanced by nitrogen-doped graphene. The heavy metal ion adsorption material has a fast adsorption rate, a large adsorption capacity and a fast regeneration rate. In the invention, polyvinyl alcohol, lignosulfonic acid and carboxymethyl chitosan are used as main raw materials and nitrogen-doped graphene is used as an accessory. After a cross-linking reaction of the materials, the product is activated by alkaline potassium permanganate. The preparation method has simple processes, is easy to operate and is suitable for industrial production. The preparation method utilizes cheap and easily available raw materials without toxic and harmful substances, reduces a production cost, does not produce toxic and harmful substances in preparation, can be used under mild reaction conditions, has low energy consumption and is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of environmental protection materials, in particular to a graphene-based heavy metal ion adsorption material and a preparation method thereof. Background technique [0002] In recent years, environmental pollution has attracted increasing attention, and the removal of heavy metal ions in sewage has become a hot research topic. The main treatment methods include adsorption, chemical precipitation, ion exchange, membrane separation, and biological flocculation. Among them, the adsorption method has Simple operation, good heavy metal treatment effect and so on. [0003] The adsorption method is to make heavy metal ions adhere to the active site surface of the adsorbent through physical or chemical methods, and then achieve the purpose of removing heavy metal ions. Commonly used adsorbents include natural materials and artificial materials. materials, agricultural and forestry waste, sediment, etc., artificial materials ...

AI Technical Summary

Problems solved by technology

[0003] The adsorption method is to make heavy metal ions adhere to the active site surface of the adsorbent through physical or chemical methods, and then achieve the purpose of removing heavy metal ions. Commonly used adsorbents include natural materials and artificial materials. materials, agricultural and forestry waste, sediment, etc., artificial materials include nanomaterials, etc. Generally speaking, natural materials are easier to obtain and lower in cost, but the adsorption effect is poor. The preparation cost of artificial materials is higher than that of natural materials, but the adsorption effect is lower. it is good

[0004] Chinese patent 201410104126.3 discloses a preparation method of a silica gel adsorbent functionalized with N,N-bis(phosphinemethyl) disubstituted dithiocarbamic acid and its adsorption effect on heavy metal ions such as cadmium, copper, nickel and lead; But its cost is high, and the adsorption rate is slow; Chinese patent 201010161774.4 discloses an adsorbent for removing heavy metals in water and its preparation method. The adsorbent for removing heavy metals in water is made of polymer materials, metal oxides and pore-forming agents. It has a large adsorption capacity and fast adsorption speed for heavy metals; however, it has the problem of difficult regeneration