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Method for removing heavy metal ions in water by using graphene oxide sheet

A technology of heavy metal ions and graphene sheets, applied in chemical instruments and methods, water pollutants, and other chemical processes, to achieve low cost, simple operation process, and good biocompatibility

Inactive Publication Date: 2011-02-16
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Graphene materials have not been reported in the treatment of heavy metal pollution

Method used

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  • Method for removing heavy metal ions in water by using graphene oxide sheet
  • Method for removing heavy metal ions in water by using graphene oxide sheet
  • Method for removing heavy metal ions in water by using graphene oxide sheet

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: concrete steps are as follows:

[0020] (1), single-layer graphene oxide sheet solution preparation: use natural graphite powder as raw material, get 3 grams, 325 mesh fineness of natural graphite powder, add 12 milliliters of concentrated sulfuric acid, 2.5 gram potassium persulfate and 2.5 gram dioxane pentoxide Phosphorus, mixed evenly at 80°C, allowed to react for 4.5 hours; the mixture was cooled to room temperature, diluted with deionized water and left to stand overnight, then separated by filtration with a cellulose acetate membrane with 0.2 micron pores, and washed with a large amount of deionized water After washing, the product was allowed to stand overnight at room temperature; the above product, namely pre-oxidized graphite, was stirred and slowly added to a mixed solution of 120 ml of cooled concentrated sulfuric acid at 0°C and 15 grams of potassium permanganate, at 35°C After stirring for 2 hours, dilute with 250 ml of deionized water, cont...

Embodiment 2

[0022] Embodiment 2: The preparation process and steps of the graphene oxide sheet solution in this embodiment are exactly the same as the above-mentioned embodiment 1.

[0023] Take 2 ml of 1.0 mg / ml graphene oxide sheet solution, add 2 ml of 100 mmol / l lead nitrate solution, mix and shake well. The graphene oxide sheet solution immediately appeared agglomeration phenomenon, and the solution became a suspension.

[0024] Take 2 ml of 1.0 mg / ml graphene oxide flake solution, add 2 ml of 100 mmol / l cadmium nitrate solution, mix and shake well. The graphene oxide sheet solution immediately appeared agglomeration phenomenon, and the solution became a suspension.

[0025] This shows that the adsorption of graphene oxide on heavy metal ions is universal.

Embodiment 3

[0026] Embodiment 3: The preparation process and steps of the graphene oxide sheet solution in this embodiment are exactly the same as the above-mentioned embodiment 1. The difference is: use sodium hydroxide solution and hydrogen chloride solution to adjust the initial pH value of graphene oxide sheet solution and copper chloride solution to 5.0, and mix the two so that the final concentration of graphene oxide sheet is 0.5 mg / ml , the final concentrations of copper chloride were 50, 75, 100, 200, 300, 400, 500, 600, 700, 1000 micromol / liter, mixed well, and the suspension was left to stand at room temperature for 12 hours, and then 14000 Spin / centrifuge for 30 minutes, and measure the concentration of copper ions in the supernatant. The obtained copper ion equilibrium concentration (C e ) and equilibrium adsorption capacity (q e ) data fit the Langmuir adsorption isotherm model. Adsorption isotherm see Figure 4 . The maximum adsorption capacity of graphene oxide sheets...

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Abstract

The invention relates to a method for removing heavy metal ions in water by using a graphene oxide sheet, which belongs to the technical fields of water purification and environmental protection. In the invention, the graphene oxide sheet is used as an adsorbent of the heavy metal ions, wherein the graphene oxide sheet is of a monatomic layer two-dimensional structure and has a huge specific surface while ensuring no obvious toxicity. In the purification process of the method, the operations are simple without pollution, and the copper ion adsorption efficiency is 10 times that of the active carbon. In the invention, the graphene oxide sheet adsorbing the metal ions can be recovered to the single sheet structure by a centrifugal separation or dialysis method and can be recycled.

Description

technical field [0001] The invention relates to a method for removing heavy metal ions in water by using graphene oxide sheets, and belongs to the technical field of water quality purification and environmental protection. Background technique [0002] In recent years, my country is facing increasingly serious environmental problems such as water pollution. Heavy metals have become important pollutants in water pollution due to their high toxicity, non-degradability and easy accumulation in organisms. There are many methods to purify heavy metal ion polluted water, such as chemical precipitation, ion exchange, electrodialysis, adsorption and so on. Among these methods, adsorbent adsorption is a simple, efficient, and inexpensive method for removing heavy metal ions. The key to improving this method lies in the development of more efficient, environmentally friendly, and inexpensive adsorbent materials. [0003] At present, many materials have been reported to remove heavy...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F101/20B01J20/20C02F1/62
Inventor 王海芳常艳丽杨胜韬董二亚刘刚波陈胜王艳雯曹傲能
Owner SHANGHAI UNIV
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