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Preparation method of graphene oxide/amino acid composite material with adsorption effect on heavy metal ions

A technology of heavy metal ions and composite materials, applied in the field of composite material preparation and application, can solve the problem of low removal efficiency of divalent heavy metal ions, and achieve the effect of improving removal efficiency

Inactive Publication Date: 2015-03-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although a variety of adsorbents including graphene oxide composites have a certain adsorption and removal effect on heavy metal ions, the existing adsorbents generally have the problem of low removal efficiency of divalent heavy metal ions under acidic conditions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Preparation of graphene oxide / amino acid composite material: ultrasonically disperse 0.1g graphite oxide in 20mL ultrapure water to obtain a graphene oxide dispersion, then mix 0.2g L-alanine with an equimolar amount of sodium hydroxide After dissolving in 20mL ultrapure water, mix it with the graphene oxide dispersion, and stir the mixture at room temperature for 8h, then treat the solution with 40mL ethanol after the reaction, wash with 1:1 ethanol / ultrapure water, and finally Dry at 50°C for 24h to obtain a graphene oxide / L-alanine composite material;

[0016] (2) Adsorption of heavy metal ions by graphene oxide / amino acid composite material: adjust 20mL 10mg / L of Cu 2+ The pH of the solution was 6, and then 5 mg of graphene oxide / L-alanine composite material was added, stirred at 20°C for 24 hours, filtered through a 0.22 μm microporous membrane to obtain a clear solution, and then passed through flame atomic absorption spectrophotometry Clarified solution Cu a...

Embodiment 2

[0018] (1) Preparation of graphene oxide / amino acid composite material: ultrasonically disperse 0.1g graphite oxide in 20mL ultrapure water to obtain a graphene oxide dispersion, then mix 0.3g L-tryptophan with an equimolar amount of sodium hydroxide After dissolving in 20mL ultrapure water, mix it with the graphene oxide dispersion, and stir the mixture at room temperature for 8h, then treat the solution with 40mL ethanol after the reaction, wash with 1:1 ethanol / ultrapure water, and finally Dry at 50°C for 24h to obtain a graphene oxide / L-tryptophan composite material;

[0019] (2) Adsorption of heavy metal ions by graphene oxide / amino acid composite material: adjust 20mL 10mg / L of Pb 2+ The pH of the solution was 7, and then 15 mg of graphene oxide / L-tryptophan composite material was added, stirred at 20°C for 24 hours, filtered with a 0.22 μm microporous membrane to obtain a clear solution, and then passed through flame atomic absorption spectrophotometry Detection of Pb ...

Embodiment 3

[0021] (1) Preparation of graphene oxide / amino acid composite material: ultrasonically disperse 0.1g graphite oxide in 20mL ultrapure water to obtain a graphene oxide dispersion, then oxidize 0.4g L-cysteine ​​with an equimolar amount of hydrogen After dissolving sodium in 20mL of ultrapure water, mix it with the graphene oxide dispersion, stir the mixture at room temperature for 8h, then treat the solution with 40mL of ethanol, wash with 1:1 ethanol / ultrapure water, and finally Dry at 50°C for 24h to obtain a graphene oxide / L-cysteine ​​composite;

[0022] (2) Adsorption of heavy metal ions by graphene oxide / amino acid composite material: adjust 20mL 30mg / L of Pb 2+ The pH of the solution was 4, and then 10 mg of graphene oxide / L-cysteine ​​composite material was added, stirred at 20°C for 0.5 h, filtered through a 0.22 μm microporous membrane to obtain a clear solution, and then passed through flame atomic absorption spectrometry Photometric detection of Pb in clarified sol...

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Abstract

The invention discloses a preparation method of a graphene oxide / amino acid composite material with an adsorption effect on heavy metal ions under acidic conditions, belonging to the technical fields of preparation and application of composite materials. The preparation method comprises the following step: reacting amino groups in amino acid with carboxy groups in graphene oxide to prepare the graphene oxide / amino acid composite material by virtue of nucleophilic reaction. Amino acid is an environment-friendly amphoteric compound; because amino acid contains the amino groups and carboxy groups which have strong complexing action on the heavy metal ions, by preparing amino acid functionalized graphene oxide, the removal efficiency of functionalized graphene oxide on heavy metals under the acidic conditions can be improved by using the specific characteristic that amino acid has acidity and alkalinity; and moreover, because amino acid is environment-friendly, secondary pollution cannot be caused in a heavy metal ion removal process. Under the condition that the pH value is 2-7, relatively good adsorption effects on Pb<2+> and Cu<2+> can be achieved, and the adsorption efficiency can reach 71-99%. The graphene oxide / amino acid composite material prepared by using the preparation method disclosed by the invention has relatively high practical application values in the adsorption effects on the heavy metal ions under the acidic conditions.

Description

technical field [0001] The invention discloses a method for preparing a graphene oxide / amino acid composite material capable of adsorbing heavy metal ions under acidic conditions, belonging to the technical field of composite material preparation and application. Background technique [0002] Heavy metals mostly exist in nature in the form of simple substances or compounds, and do not pose a great threat to ecology and humans. However, in recent years, due to the excessive mining and smelting of metal minerals by humans, a large amount of wastewater containing heavy metal ions has been produced in industrial production processes such as chemical industry, electronics, instrumentation, and machinery manufacturing. These are the main sources of water and soil environmental pollution. Even at very low concentrations, the toxicity of heavy metals accumulates through the food chain and causes serious harm to the ecological environment and human health. Therefore, it is very impo...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
CPCB01J20/22B01J2220/4812C02F1/285C02F2101/20
Inventor 刘湘檀梦婷李炜张佳瑜
Owner JIANGNAN UNIV
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