Oxidized graphene aftertreatment work procedure acid-containing wastewater cyclic utilization method

Abstract

The invention discloses an oxidized graphene aftertreatment work procedure acid-containing wastewater cyclic utilization method which comprises the following steps: (1) preparing oxidized graphene slurry; (2) diluting the oxidized graphene slurry; (3) adding hydrogen peroxide and diluted hydrochloric acid into the diluted slurry and stirring to obtain oxidized graphene slurry to be treated; (4) repeatedly washing the oxidized graphene slurry to be treated and filtering acid-containing wastewater out after every time of washing; (5) dividing the acid-containing wastewater into high, middle andlow electric conduction sections according to conductivity and collecting the acid-containing wastewater in the middle and low electric conduction sections; (6) applying the acid-containing wastewaterin the middle and low electric conduction sections to washing the oxidized graphene slurry in the high and middle electric conduction sections. According to the oxidized graphene aftertreatment workprocedure acid-containing wastewater cyclic utilization method disclosed by the invention, the acid-containing wastewater discharged in a purifying work procedure is divided according to the conductivity; the acid-containing wastewater in the middle and low electric conduction section is respectively applied to washing the oxidized graphene slurry in the high and middle electric conduction sections; thus, the method achieves cyclic utilization of acid-containing wastewater.

Description

technical field [0001] The invention belongs to the technical field of graphene, and in particular relates to a method for recycling acid-containing wastewater in a graphene oxide post-treatment process. Background technique [0002] Graphene is a carbon atom with sp 2 Two-dimensional carbon nanomaterials composed of hybrid orbitals in a hexagonal honeycomb lattice have important applications in materials science, micro-nano processing, energy, biomedicine, and drug delivery due to their excellent optical, electrical, and mechanical properties. Foreground, considered a future revolutionary material. The preparation methods of graphene mainly include mechanical exfoliation method, redox method, chemical vapor deposition (CVD), peeling carbon nanotube method, arc method, epitaxial growth method, thermal expansion method, etc. However, these methods have some drawbacks. The graphene prepared by the mechanical exfoliation method has low output, small area, and is not easy to ...

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Problems solved by technology

However, the Hummers oxidation method needs to use a large amount of concentrated sulfuric acid, potassium permanganate and other reagents, leaving a large amount of SO in the reaction product. 4 2- , Mn 2+ 、H + Wait

The post-treatment method of graphene oxide is to wash the reaction product repeatedly until the pH value of the product is 5-7. During the washing process, a large amount of pure water is consumed, and a large amount of acid-containing wastewater is produced, causing serious pollution to the environment.