Novel efficient grapheme loaded nano-iron material for adsorbing phosphorus in water

Abstract

The invention relates to a novel efficient grapheme loaded nano-iron material for adsorbing phosphorus in water. The grapheme loaded nano-iron material is composed of nano-iron and grapheme, wherein the nano-iron accounts for 10-70 percent of the total weight of the material. The macrostructure of the material is powder-shaped, and as for the microstructure, the grapheme adopts a sheet-shaped structure, the nano-iron is uniformly dispersed on the surface of the grapheme, when the nano-iron accounts for 30 percent or less than 30 percent of the total weight of the material, the nano-iron adopts a dot-shaped structure, and when the nano-iron accounts for more than 30 percent of the total weight of the material, the nano-iron adopts a chain structure; the particle diameter of nano-iron is 50-70 nm; the nano-iron is loaded on grapheme, firstly, elemental iron reacts with hydrogen ions to generate ferrous iron, and then ferrous iron, phosphate radical and water molecules are reacted to quickly generate hydrated ferrous phosphate or hydrated iron phosphate; and under the condition that the initial concentration of phosphate radical in water is less than 4 mg / L, the grapheme loaded nano-iron can remove over 99 percent of phosphate radical, so that the effluent concentration of phosphate radical is under 0.02 mg / L, as a result, when the concentration of phosphate radical in inflow water quality of lakes is less than 0.02 mg / L, eutrophication cannot occur.

Description

technical field [0001] The invention relates to a material for adsorbing phosphorus in water, in particular to a novel graphene-supported nano-iron material for efficiently adsorbing phosphorus in water. Background technique [0002] Eutrophication is an environmental problem that the world is concerned about today. Many lakes in the world have suffered from eutrophication. Eutrophication can cause many problems, for example, it can reduce the light transmission of the lake, lead to the reduction of biomass in the lake and the bloom of blue-green algae and so on. The excess of nutrients, especially the excessive concentration of phosphorus, is the main factor causing eutrophication. As an essential nutrient element for algae, phosphorus plays a vital role in the process of eutrophication. One of the keys to control eutrophication is to control the concentration of phosphorus in water. In order to better control the concentration of phosphorus in water, a lot of research h...

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Problems solved by technology

Although the stability of nano-iron has been enhanced to a certain extent after being loaded on these materials, and the efficiency of removing pollutants is also relatively stable, but there are still many studies showing that the stability of nano-iron after loading gradually decreases with time.

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