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Magnetic oxidized graphene/polyethyleneimine adsorbent and preparation method and application thereof

A technology of polyethyleneimine and oxidized rock, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve separation problems, achieve easy access to raw materials, achieve rapid separation, and increase adsorption sites Effect

Inactive Publication Date: 2018-11-13
信阳学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, polyethyleneimine covalently modified graphene oxide has good water solubility, and cannot be quickly separated from aqueous solution after adsorbing Cr(VI).

Method used

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  • Magnetic oxidized graphene/polyethyleneimine adsorbent and preparation method and application thereof
  • Magnetic oxidized graphene/polyethyleneimine adsorbent and preparation method and application thereof
  • Magnetic oxidized graphene/polyethyleneimine adsorbent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The specific steps of the preparation method of magnetic graphene oxide / polyethyleneimine are as follows:

[0035] (1) Preparation of graphene oxide

[0036] Weigh 5 g of graphite powder and 115 mL of concentrated sulfuric acid in a 500 mL three-necked flask, and mechanically stir for 30 min in an ice-water bath. Weigh 15g KMnO 4 Slowly add to the reaction system in 3 times and keep the system temperature below 5 °C. Wait for KMnO 4 After the addition was complete, the reaction bottle was moved to a constant temperature water bath at 35 °C and stirred for 2.5 h. Then 230 mL of ultrapure water was added at one time, and mechanically stirred in a constant temperature oil bath at 100 °C for 45 min. Subsequently, the reaction bottle was removed and the reaction solution was transferred to a 1 L beaker. When the temperature of the system dropped to 50 °C, 700 mL of ultrapure water and 12.5 mL of 30% hydrogen peroxide were added at one time. Then, filter under normal pre...

Embodiment 2

[0048] The adsorption amount of magnetic graphene oxide / polyethyleneimine adsorbent to hexavalent chromium ion is calculated according to the following formula: Q = (C 1 -C 2 )VM / m; where Q: adsorption capacity (mg / g); C 1 : Chromium ion concentration before adsorption (mmol / L); C 2 : concentration of chromium ion after adsorption (mmol / L); V: volume of adsorption solution (L); m: mass of magnetic graphene oxide / polyethyleneimine (g); M: atomic weight of chromium (g / mol).

[0049] The adsorption capacity of magnetic graphene oxide / polyethyleneimine to hexavalent chromium ions was determined by ultraviolet-visible spectrophotometry. The specific steps are as follows:

[0050] (1) Exploration of adsorption time: Accurately weigh 10 mg of magnetic graphene oxide / polyethyleneimine adsorbent into 30 mL, 2 mmol / L solution of hexavalent chromium ions at pH=3.00, and stir at 25°C , respectively reacting 0 min, 1 min, 3 min, 5 min, 7 min, 9 min, 15 min, 18 min, 25 min, 30 min, 60 mi...

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PUM

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Abstract

The invention provides a magnetic oxidized graphene / polyethyleneimine adsorbent and a preparation method and application thereof. Magnetic L-dopa modified ferroferric oxide nano particles are bonded to polyethyleneimine modified oxidized graphene to obtain the magnetic oxidized graphene / polyethyleneimine adsorbent material. The adsorbent material has multiple adsorption sites and can achieve quickseparation from wastewater under the effect of an applied magnetic field. The preparation raw materials for the adsorbent material are easy to obtain, experiment conditions are mild, a treatment process is simple, and the material has good performance on the aspect of wastewater treatment.

Description

technical field [0001] The invention relates to the field of environmental functional materials and water treatment new technologies, in particular to a magnetic graphene oxide / polyethyleneimine adsorbent and its preparation method and application. Background technique [0002] Chromium-containing heavy metal industrial wastewater has always been a research hotspot in the field of wastewater treatment due to its high toxicity and potential carcinogenicity. At present, the removal methods of Cr(VI) mainly include ion exchange, electrolysis, chemical precipitation and adsorption. Among them, the adsorption method is widely used due to its advantages of simple operation, high Cr(VI) adsorption efficiency, and environmental protection. In recent years, commonly used adsorbents such as activated carbon, natural organic adsorbents (corn stalks, peanut skins, etc.), natural inorganic adsorbents (zeolite, clay, etc.) and synthetic adsorbents (polyamine anion exchange fibers, etc.),...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/26B01J20/30C02F1/28C02F101/22
CPCB01J20/20B01J20/261C02F1/28C02F2101/22
Inventor 张秋平张文银黄艳伟杨超张若琳赵丹
Owner 信阳学院
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