Preparation method of coated nano zero-valent iron taking multilayer activated-carbon-coated graphene oxide composite powder as carrier

Abstract

The invention discloses a preparation method of coated nano zero-valent iron taking multilayer activated-carbon-coated graphene oxide composite powder as a carrier. The preparation method comprises the following steps: firstly, preparing coated nano zero-valent iron; then, preparing multilayer activated-carbon-coated graphene oxide composite powder; adding the obtained multilayer activated-carbon-coated graphene oxide composite powder to water and ultrasonically dispersing for 1-3h so as to obtain a graphene oxide suspension, then adding the prepared coated nano zero-valent iron, fully stirring, and carrying out suction filtration, washing and drying so as to obtain the coated nano zero-valent iron taking multilayer activated-carbon-coated graphene oxide composite powder as a carrier. The coated nano zero-valent iron disclosed by the invention is prepared by taking cheap and harmless flavonol, polymeric ferric sulfate and polyacrylamide as surface modifiers, so that the removal rate of heavy metals in water is improved.

Description

technical field [0001] The invention relates to a preparation method of a heavy metal adsorbent, in particular to a preparation method of encapsulated nano zero-valent iron with multi-layer activated carbon-coated graphene oxide composite powder as a carrier. Background technique [0002] At present, my country's heavy metal pollution is relatively serious, and the heavily polluted provinces have affected the safety of agricultural products and drinking water. In particularly serious areas, basic farmland has been converted into urban construction land. How to deal with heavy metal wastewater has become a hot and difficult point in the field of environmental science and engineering research, and it is also the key to solving heavy metal pollution in our country. Compared with other methods, the adsorption method has the advantages of simple operation, short processing time, low cost, and good effect, but different adsorption materials have a great influence on the adsorption...

AI Technical Summary

Problems solved by technology

[0005] The existing nano-zero-valent iron still has many limitations in practical applications, mainly reflected in: the high activity of nano-zero-valent iron, which will react with oxygen and water in water, thereby reducing the removal rate of target pollutants; The activity of zero-valent iron increases under acidic conditions, but acidic conditions will corrode equipment in practical applications; nano-zero-valent iron is difficult to recover in aqueous solution, and nano-zero-valent iron particles are prone to agglomeration in solution, which greatly reduces its reactivity and utilization efficiency

In addition, although the surface of graphene oxide materials has active groups such as hydroxyl, carbonyl and carboxyl groups, which can interact with metal ions, its selectivity is not satisfactory.