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Preparation method and application of DTPA (diethylenetriaminepentaacetic acid)-modified magnetic graphene oxide composite

A technology of diethylenetriaminepentaacetic acid and composite materials, which is applied in chemical instruments and methods, alkali metal compounds, alkali metal oxides/hydroxides, etc. Removal effect, preparation process and simple operation effect

Inactive Publication Date: 2016-11-16
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, graphene oxide has been used as a new type of adsorption material to treat heavy metal pollution in sewage. Graphene oxide has a large specific surface area, stable physical and chemical properties, and rich in oxygen-containing functional groups, but graphene oxide exists in wastewater treatment. Separation and recovery are difficult and can only be applied to neutral wastewater heavy metals and other defects

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  • Preparation method and application of DTPA (diethylenetriaminepentaacetic acid)-modified magnetic graphene oxide composite
  • Preparation method and application of DTPA (diethylenetriaminepentaacetic acid)-modified magnetic graphene oxide composite
  • Preparation method and application of DTPA (diethylenetriaminepentaacetic acid)-modified magnetic graphene oxide composite

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Embodiment 1

[0029] A kind of preparation of diethylenetriaminepentaacetic acid-supported graphene oxide composite material of the present invention adopts natural graphite powder as matrix material, and concrete preparation method is as follows:

[0030] First, 6g of natural graphite powder was added to 24mL of concentrated sulfuric acid, and 5g of phosphorus pentoxide and 5g of potassium persulfate were added under stirring conditions. Then heat the reaction in a water bath at 80°C for 6h, wash the obtained product with deionized water until neutral, and dry it in vacuum at 60°C for 24h to obtain pre-oxidized graphite; then add 6g of pre-oxidized graphite to 240mL 98%H 2 SO 4 solution (ice bath 0°C). Add 5g NaNO while stirring 3 , slowly add 30g KMnO three times 4 (keep the temperature below 20°C in an ice bath) to react for 4h. Then the temperature was raised to 35°C and stirred for 2 hours, 500 mL of deionized water was added to the system, the temperature was raised to 98°C for 1 ...

Embodiment 2

[0032] Diethylene triamine pentaacetic acid negatively modified magnetic graphene oxide composite material of the present invention treats Pb in wastewater 2+ , including the following steps:

[0033] Take 25mL of Pb with an initial concentration of 100-400mg / L 2+ Solution, add the diethylenetriaminepentaacetic acid negatively modified magnetic graphene oxide composite material that embodiment 1 makes, the consumption of this adsorbent is 10mg, carry out adsorption reaction in 25 ℃ constant temperature water-bath shaking table after 24 hours, pass through magnet The composite material is separated from the waste water, and the waste water is filtered with a 0.22um filter membrane, and the Pb in the waste water is determined by atomic absorption 2+ The content of the calculated adsorption capacity is shown in Table 1:

[0034] Table 1: Different Pb2+ The adsorption capacity of composite materials under the condition of initial concentration

[0035]

[0036] It can be see...

Embodiment 3

[0038] Diethylenetriaminepentaacetic acid negatively modified magnetic graphene oxide composite material of the present invention treats Pb in wastewater at different pH values 2+ , including the following steps:

[0039] Prepare six 25mL Pb with an initial concentration of 100mg / L 2+ solution, add 10 mg of the composite material prepared in Example 1, adjust the pH value of the solution to 1.0, 2.0, 3.0, 4.0, 5.0, and 6.0 with HCl and NaOH, and carry out the adsorption reaction in a constant temperature water bath shaker at 25°C for 24 hours , the composite material is separated from the waste water by a magnet, the waste water is filtered with a 0.22um filter membrane, and the Pb in the waste water is determined by atomic absorption 2+ The content of , the calculated degradation results are shown in Table 2:

[0040] Table 2: Pb at different solution pH values 2+ The adsorption data

[0041] pH

[0042] It can be seen from Table 2 that when the initial pH of th...

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Abstract

The invention relates to a preparation method and an application of a DTPA (diethylenetriaminepentaacetic acid)-modified magnetic graphene oxide composite. Graphene oxide is taken as a substrate of the composite, and DTPA is supported on the substrate surface. The preparation method comprises the specific steps as follows: natural graphite powder is pre-oxidized, pre-oxidized graphene is obtained, and graphene oxide is prepared with a Hummer method; then magnetic graphene oxide is prepared with a coprecipitation method, DTPA is grafted to magnetic graphene oxide through diethylenetriamine as an intermediate, and the composite is obtained. In the application of the DTPA-modified magnetic graphene oxide composite prepared with the method, the composite can have a good adsorption effect on heavy metal ions in acidic wastewater with pH equal to 3 and can selectively remove Pb<2+> in mixed metal ions. The composite can be separated from an aqueous solution through a magnet and can be reused after desorption with hydrochloric acid.

Description

technical field [0001] The invention belongs to the field of environmental functional materials and water treatment new technologies, and specifically relates to a preparation method and application of a diethylenetriaminepentaacetic acid-modified magnetic graphene oxide composite material. Background technique [0002] The heavy metal ions contained in industrial wastewater are extremely harmful to the environmental ecosystem. With the rapid development of industry, a large amount of heavy metals are discharged into water bodies. These heavy metals are large in quantity, cannot be biodegraded, can accumulate in the environment, and have toxic or carcinogenic effects on humans and animals. Therefore, it is necessary to explore a cost-effective technology for heavy metal treatment of industrial wastewater before discharge. The general treatment methods for wastewater containing heavy metals include adsorption, chemical precipitation, ion exchange and membrane filtration. Am...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/28B01J20/30C02F1/28
CPCB01J20/20B01J20/22B01J20/28009B01J2220/46C02F1/285C02F2101/20
Inventor 李欣王胜凡刘云国曾光明江卢华宋彪李美芳邓佳钦华权吴疑
Owner HUNAN UNIV
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