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Novel graphene oxide/iron and manganese oxide composite material for removing inorganic mercury in water and preparation method thereof

A technology of iron-manganese oxides and composite materials, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of weak chemical bonds, decreased removal efficiency, low mechanical strength, etc., and achieve simple preparation steps Effect

Inactive Publication Date: 2016-06-01
NANKAI UNIV
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Problems solved by technology

However, these adsorbents also have many disadvantages, such as low mechanical strength, poor hydrothermal stability, weak chemical bonds with heavy metals, and decreased removal efficiency when the concentration of mercury is low, etc.

Method used

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  • Novel graphene oxide/iron and manganese oxide composite material for removing inorganic mercury in water and preparation method thereof
  • Novel graphene oxide/iron and manganese oxide composite material for removing inorganic mercury in water and preparation method thereof
  • Novel graphene oxide/iron and manganese oxide composite material for removing inorganic mercury in water and preparation method thereof

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Embodiment

[0012] This implementation provides a kind of simple and convenient preparation method of novel graphene oxide / iron-manganese oxide composite material, and it is applied to inorganic mercury (Hg 2+ ) adsorption. The preparation procedure of the novel graphene oxide / iron manganese oxide composite material is relatively simple: take 24mL graphene oxide suspension (2gGO / L) and add 360mL deionized water, under nitrogen condition, slowly add 8mL ferrous sulfate stock solution ( 0.8gFe / L), magnetic stirring to fully mix ferrous sulfate and graphene oxide. Add 8 mL of potassium permanganate stock solution (0.26 gMn / L) drop by drop while stirring magnetically, and adjust the pH to 7.5 immediately after mixing evenly. At this time, iron-manganese oxides formed dark brown flocculent precipitates, which were highly dispersed on the surface of the graphene oxide sheet structure. The magnetic stirring was continued for 1 hour to ensure full reaction, and the material was allowed to stand...

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Abstract

The invention provides a simple and convenient preparation method of a novel graphene oxide / iron and manganese oxide composite material for removing inorganic mercury in water. The preparation method comprises the following steps of: sequentially adding a ferrous sulfate solution and a potassium permanganate solution into a graphene oxide suspension, mixing uniformly, regulating the pH to 7.5, stirring and standing, thereby obtaining graphene oxide / iron and manganese oxide composite material turbid liquid. The graphene oxide is compounded with iron and manganese oxides, so that agglomeration of iron and manganese oxide particles is prevented, and the removal effect of inorganic mercury (Hg<2+>) in water is obviously improved. The material is capable of promoting the growth of wheat seedlings and rice seedlings and simultaneously reducing the biotoxicity of the mercury. The novel graphene oxide / iron and manganese oxide composite material has the advantages of simple process, stable effect, wide application range, environmental friendliness and no secondary pollution, and has wide application prospect in the aspect of restoring from heavy metal pollution in water and soils.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method for removing inorganic mercury (Hg 2+ ) novel graphene oxide / iron manganese oxide composite material and its preparation method. Background technique [0002] Mercury is one of the most bioaccumulative toxic heavy metals in nature. where Hg 2+ It is the main form of inorganic mercury in natural water bodies. Methylmercury is usually converted to Hg by sulfate-reducing bacteria under anoxic conditions. 2+ Methylation forms, persists in the body and can bioaccumulate through the food chain. Hg removal from water 2+ There are many techniques, including chemical precipitation, solvent extraction, cementation, ultrafiltration, coagulation, ion exchange, photocatalysis, and adsorption. Among them, adsorption is considered to be the most promising technology due to its advantages of low cost, easy operation, and easy design. A variety of adsorbents have been applied...

Claims

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Application Information

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IPC IPC(8): B01J20/20C02F1/28C02F101/20
CPCB01J20/20B01J20/06C02F1/281C02F1/288C02F2101/20
Inventor 唐景春黄耀宫艳艳吕宏虹王琳刘君成
Owner NANKAI UNIV
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