Graphene sponge used for enriching heavy metals or removing pollutants in water and preparation method of graphene sponge

Abstract

The invention discloses a graphene sponge used for enriching heavy metals or removing pollutants in water and a preparation method of the graphene sponge. The preparation method comprises the following steps: ultrasonically uniformly mixing oxidized graphene and a sodium alginate solution with a mass ratio of 1:0.1-1:10, adding an alkaline substance to adjust a pH value to be 8-10; sealing at the temperature of 60-150 DEG C to perform heating reaction for 0.5h-10h to obtain graphene hydrogel; and adding a calcium ion solution in the obtained graphene hydrogel, washing respectively with acid and water, and then drying to obtain a target product. According to the preparation method, the preparation process is simple, the raw material ingredients are relatively simple and are easily available, secondary pollution is avoided, the popularization is easy, and large-batch production can be performed; the prepared graphene sponge is relatively disperse and porous, and is large in specific surface area so that the adsorption capacity to the pollutants is increased. The problem that solid-liquid separation is difficultly performed by adopting a nanometer adsorbing agent is solved. The graphene sponge can be used for adsorbing organic pollutants and heavy metal ions in water, and can also be used for enriching trace heavy metals in water.

Description

Technical field: [0001] The invention relates to the technical field of functional materials, in particular to a graphene sponge used for enriching heavy metals or removing pollutants in water and a preparation method thereof. Background technique: [0002] At present, water pollution has attracted more and more people's attention. The heavy metals in the water are difficult to degrade and will accumulate in the human body along with the ecological cycle, thus endangering human health. Therefore, it is very important to remove and detect heavy metals in water. How to quickly and efficiently remove heavy metal ions in water, and how to enrich and detect trace heavy metals in water has become a major topic in the research of water pollution control. [0003] Graphene is an emerging material with a high specific surface area, and its theoretical specific surface area is as high as 2630m 2 / g. It has potential application performance in adsorption enrichment. However, as an ...

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Problems solved by technology

However, as an adsorption material, there are certain defects in practical applications. Graphene has a two-dimensional sheet structure, which can easily lead to changes in its flexible structure during the adsorption process of the target substance, and blockage of micropores inside the material, resulting in a decrease in its specific surface area and affecting the adsorption performance. , and it is not easy to separate solid and liquid, so its structure must be improved in practical application

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