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Method for adsorbing heavy metal ions via graphene

A technology for adsorbing heavy metals and heavy metal ions, which is applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage treatment, etc., to achieve the effect of large specific surface area, large application prospects, and simple operation

Inactive Publication Date: 2014-09-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After searching the existing literature, it is found that there are few reports on the adsorption of heavy metal ions by nanomaterials.

Method used

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  • Method for adsorbing heavy metal ions via graphene
  • Method for adsorbing heavy metal ions via graphene
  • Method for adsorbing heavy metal ions via graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Graphene is prepared by reducing graphene oxide with acetylacetone, and 50 mg of prepared graphene is added to heavy metal ions Pb with different concentrations. 2+ 、Cd 2+ and Co 2+ In aqueous solution, Pb 2+ 、Cd 2+ and Co 2+ The concentration ranges are 2-80mg / L, 0.2-40mg / L and 0.2-50mg / L respectively, and several test points are taken in each range. Use hydrochloric acid, ammonia water or sodium hydroxide to adjust the pH to 6.00 (according to the data measured by the pH meter), and stir magnetically for 2-8 hours. Then filter with a filter membrane with a pore size of 0.22 μm, measure the concentration of ions in the filtrate with ICP-AES, and calculate the Pb adsorbed by graphene 2+ 、Cd 2+ and Co 2+ quantity.

Embodiment 2

[0039] Graphene is prepared by reducing graphene oxide with acetylacetone, and 50 mg of prepared graphene is taken, and a concentration of 55 mg / L is added to the Pb 2+ in aqueous solution. Use hydrochloric acid, ammonia water or sodium hydroxide to adjust the pH to different integer values ​​between 3.00 and 10.00 (based on the data measured by the pH meter), and stir for 2 to 8 hours. Then filter with a filter membrane with a pore size of 0.22 μm, and measure the concentration of the obtained filtrate by ICP-AES, and calculate the Pb adsorbed by graphene 2+ quantity.

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Abstract

The invention discloses a method for adsorbing heavy metal ions via graphene. The method comprises the following steps: adding the graphene taken as an adsorbent prepared by reduction of diacetone into an aqueous solution of heavy metal ions Pb2<+>, Cd2<+> and Co2<+>, regulating pH (Potential Of Hydrogen), stirring and filtering so as to obtain filtrate; and measuring the concentration of the ions in the filtrate via an inductive-coupling plasma atom emission spectrum, stabilizing the concentrations of the Pb2<+>, the Cd2<+> and the Co2<+> and the quality of the graphene and changing the pH so as to determine the optimal pH. According to the method, the maximum adsorption quantity of the prepared graphene to the Pb2<+> is 105.4mg / g; the maximum adsorption quantity of the prepared graphene to the Cd2<+> is 49.28mg / g; the maximum adsorption quantity of the prepared graphene to the Co2<+> is 27.78mg / g, wherein the maximum adsorption quantity of the prepared graphene to the Cd2<+> is 4.5 times greater than the maximum adsorption quantity of an acidified multi-walled carbon nanotube to the Cd2<+>. Thus, the method has a good application prospect in the treatment of sewage.

Description

technical field [0001] The invention relates to a method for adsorbing heavy metal ions with nanometer materials, in particular to a method for adsorbing heavy metal ions with graphene. Background technique [0002] Environmental pollution is one of the most serious problems in the 21st century, which directly threatens the existence of human beings. Environmental pollution includes water pollution, air pollution and soil pollution. The main factors causing environmental pollution are industrial waste water, waste gas, domestic garbage, plastic products and batteries. Among them, the environmental pollution caused by industrial wastewater and heavy metals contained in batteries has a direct impact on human health, and it mainly causes heavy metal soil and water pollution. [0003] Heavy metals can be deposited in living organisms, and can react with human cells, proteins, etc., which can lead to pathological changes in the human body and affect human health. Lead can inter...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/62
Inventor 杨志柴静胡南滔高润纲张亚非
Owner SHANGHAI JIAO TONG UNIV
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