Crosslinked graphene oxide aerogel for wastewater treatment and preparation method of crosslinked graphene oxide aerogel

Abstract

The invention relates to crosslinked graphene oxide aerogel for wastewater treatment and a preparation method of the crosslinked graphene oxide aerogel. According to the technical scheme, graphene oxide is prepared from flaky graphite with a chemical oxidation method (Hummers method), then epoxy groups are introduced into graphene oxide, amino-containing substances are introduced into graphene oxide, graphene oxide is crosslinked, sizing and drying treatment are performed finally, and the crosslinked graphene oxide aerogel is prepared. The preparation method is simple, the process is simple and convenient, the adopted raw materials are cheap and widely sourced, and the prepared aerogel has good economical efficiency; by introducing amino groups, adsorption sites can be increased, adsorption efficiency of an adsorbent can be improved, the adsorbent is easy to remove from a wastewater system, secondary pollution to water is avoided, and the crosslinked graphene oxide aerogel has great application prospect.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a cross-linked graphene oxide airgel for wastewater treatment and a preparation method thereof. Background technique [0002] With the rapid development of my country's economy, at present, domestic water consumption is increasing year by year, and the amount of wastewater discharged is also increasing. Due to the complexity of domestic water, most of these domestic wastewater contain harmful impurities such as granular impurities, protein substances, oil stains, and heavy metal ions. In order to protect the increasingly damaged environment, these domestic wastewater must be purified. The existing domestic wastewater purification methods mainly include flocculation, physical adsorption, and microbial degradation. Among them, the physical adsorption method is widely used because of its simple operation, simple process and high adsorption efficiency. [0003] The physical adso...

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Problems solved by technology

[0006] In the current reports, one is the aerogel prepared by freeze-drying graphene oxide. The aerogel prepared by this method is relatively fluffy and the interlayer force is weak. When it is used for wastewater treatment, although its adsorption The efficiency is high, but because it is easy to disperse or dissolve in water, it is not easy to remove from wastewater, causing secondary pollution; another currently reported is the preparation of magnetic graphene airgel, which introduces magnetic ferroferric oxide into graphite In ene, the adsorbed graphene airgel is removed from the wastewater by using magnetism, but the preparation process of this preparation method is complicated, the process is cumbersome, and the interaction between the magnetic particles and the functional groups on the graphene oxide leads to a decrease in the number of effective functional groups. The adsorption efficiency of the magnetic graphene airgel is reduced, which leads to the increase of the treatment cost of wastewater and other problems.