Novel sulfhydrylization graphene oxide and iron and manganese oxide composite material for removing methylmercury in water body and preparation method

Abstract

A preparation method of a novel sulfhydrylization graphene oxide and iron and manganese oxide composite material is simple and convenient. The method comprises the steps that a ferrous sulfate solution and a potassium permanganate solution are added into a graphene oxide suspension in sequence, mixing is conducted to be uniform, the pH is adjusted to be 7.5, stirring and standing are conducted, water washing is conducted till the mixture is neutral, and after freeze drying is conducted, graphene oxide and iron and manganese oxide composite material powder is obtained; the powder is cleaned with ethyl alcohol, ultrasonic dispersion is conducted for 1 h in methylbenzene, after cleaning is conducted with ethyl alcohol, the treated powder is dispersed in a 2% 3-mercaptopropyltrimethoxysilane (95% ethyl alcohol) solution, stirring is conducted for 6 h, the pH is adjusted to be 9.5 with ammonia water, stirring is conducted for 24 h, water washing and freeze drying are conducted, and sulfhydrylization graphene oxide and iron and manganese oxide composite material powder is obtained. Graphene oxide is combined with iron and manganese oxides, agglomeration of the iron and manganese oxides is blocked, and the removal effect of methylmercury in water is significantly improved by means of introduction of a sulfhydryl group. The preparation method of the novel sulfhydrylization graphene oxide and iron and manganese oxide composite material has the advantages of being simple in process, stable in effect, wide in application range, environmentally friendly, high in selectivity and the like.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a novel mercaptolated graphene oxide / iron-manganese oxide composite material for removing methylmercury in water bodies and a preparation method thereof. Background technique [0002] Methylmercury is an extremely toxic metal-organic neurotoxin (the most toxic form of mercury), usually converted to Hg by sulfate-reducing bacteria under anoxic conditions. 2+ Methylation, due to its persistence in the body and its bioaccumulation through the food chain, poses a threat to human and wildlife health. Methylmercury is extremely damaging to the brain, especially the nervous system that controls motor skills, language, and memory. The formation, migration, and bioaccumulation of methylmercury in water and soil are environmental issues of common concern worldwide. The World Health Organization and the U.S. Environmental Protection Agency limit the maximum intake of methylmercury fo...

AI Technical Summary

Problems solved by technology

[0006] The study found that graphene oxide / iron manganese oxide has a large specific surface area (153m 2 / g), higher inorganic mercury (Hg 2 + ) Adsorption capacity (Q max =32.90mg / g), simple preparation, easy separation, etc., can reduce the biotoxicity of mercury to wheat and rice, and have broad application prospects in the field of water and soil heavy metal pollution remediation, but the material is not effective in adsorbing methylmercury. Good, thiolation of this material is expected to improve the removal of methylmercury, but there is no relevant literature report

Images