Three-dimensional graphene/Fe3O4 magnetic nanometer adsorption material

An adsorption material and magnetic nano technology, which is applied in the direction of adsorption of water/sewage treatment, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficult separation and low adsorption capacity, and achieve low cost and excellent preparation method Simple, cost-effective effect

Inactive Publication Date: 2018-11-30
SHANXI UNIV
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  • Application Information

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Problems solved by technology

However, traditional adsorbents have disadvantages ...

Method used

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  • Three-dimensional graphene/Fe3O4 magnetic nanometer adsorption material
  • Three-dimensional graphene/Fe3O4 magnetic nanometer adsorption material
  • Three-dimensional graphene/Fe3O4 magnetic nanometer adsorption material

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Embodiment 1

[0023] Embodiment 1: Preparation of 3D-MG

[0024] 40mg of graphene oxide was peeled off in deionized water for 20min by sonication to prepare graphene oxide dispersion, and then 110mg of FeCl was added 3 ·6H 2 O was ultrasonically dissolved, and 200mg of L-Cys was added, and 1mL of ammonia water was quickly added to adjust the pH of the reaction solution to alkaline; the reactant was stirred at 95°C for 3 hours to obtain a magnetic black precipitate; after cooling to room temperature, hysteresis separation , the black precipitate was repeatedly washed with deionized water and absolute ethanol and freeze-dried for 24 hours to obtain magnetic graphene powder.

[0025] From figure 1 The infrared spectrum shows that in the infrared spectrum of GO, 3425cm -1 The strong broad peak corresponds to the stretching vibration of -OH, 1737cm -1 The corresponding peak at is the stretching vibration of C=O, 1651cm -1 The peak corresponds to the stretching vibration of aromatic C=C, 139...

Embodiment 2

[0032] Embodiment 2:3D-MG is to the adsorption of the dyestuff of different ionic type

[0033] (1) Effect of pH on the adsorption performance of 3D-MG

[0034] Determination of before and after adsorption of methylene blue, Congo red and neutral red (2×10-5M) by 3D-MG under pure water and different pH (3-10) (add 0.001mol / L NaCl, then adjust pH with HCl and NaOH) The absorbance of 3D-MG was investigated to explore the effect of pH on the adsorption performance of 3D-MG.

[0035] (2) Effect of ionic strength on the adsorption performance of 3D-MG

[0036] The absorbance of 3D-MG before and after adsorption of methylene blue, Congo red and neutral red in NaCl solution at different concentrations (0, 0.01, 0.1, 0.5, 1, 2mol / L) was measured to explore the effect of ionic strength on the adsorption performance of 3D-MG. influences.

[0037] (3) Standard curves and linear ranges of methylene blue, Congo red and neutral red

[0038] Prepare stock solutions (2×10-3M) of three dye...

Embodiment 3

[0049] Embodiment 3: investigation of desorption and reuse situation

[0050] The complex uses absolute ethanol as the eluent, after ultrasonic oscillation for 10 minutes, hysteresis separation, and then washes three times with secondary water and absolute ethanol respectively, and vacuum-dries at 60°C to obtain the desorbed magnetic nanocomposite, which is then recycled. use. This cycle was repeated three times, and the adsorption amounts of MB, CR, and NR by 3D-MG were calculated in each cycle.

[0051] Depend on Figure 12 It can be seen that after 3D-MG was reused 4 times, the adsorption capacity only decreased slightly, indicating that 3D-MG is a reusable dye adsorption material. It shows that the complex has a good application prospect in environmental water purification.

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Abstract

The invention provides a three-dimensional graphene/Fe3O4 magnetic nanometer adsorption material. The material is obtained by ultrasonically crushing graphene oxide, adding Fe<3+> and L-Cys and performing one-pot coprecipitation under an alkaline condition. Characterization by a scanning electron microscope, a transmission electron microscope, X-ray diffraction, infrared spectroscopy, N2 adsorption and desorption and other methods prove that the three-dimensional graphene grafted with Fe3O4 magnetic nanoparticles has a good three-dimensional structure. The nanometer material synthesis method is simple and low in cost, has a large specific surface area, rich hydroxyl groups and free carboxyl groups and good magnetic properties, and can be used as an adsorption material for dye contaminantsin an aqueous solution. Adsorption property research is carried out by taking cationic methylene blue (MB), anionic Congo red (CR) and neutral type neutral red (NR) dyes as model molecules, and indicates that the material can effectively adsorb cationic, anionic and neutral dyes, and has potential applications in environmental pollutant adsorption materials.

Description

technical field [0001] The invention relates to the technical field of magnetic adsorption materials and water treatment, in particular to a three-dimensional graphene / Fe 3 o 4 Magnetic nano-adsorption material and its preparation method and application. Background technique [0002] Dyestuffs are widely used in industries such as textile industry, papermaking industry, leather processing and light industry, which not only promotes the improvement of the output and quality of textiles, but also improves people's living standards. Dyes can be divided into cationic, anionic and neutral dyes, with a variety of colors, very easy to color some textiles and other industrial products, and not easy to decolorize, so they are widely used in industrial production. However, while dyes promote economic development and create economic value, they also enter the soil and groundwater along with production, transportation, and use. This kind of wastewater is dark in color and difficult to...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30C02F1/28C02F1/48C02F101/30
CPCB01J20/20B01J20/28009B01J20/3078C02F1/283C02F1/488C02F2101/308
Inventor 梁文婷黄昱马学文李勇董文娟董川
Owner SHANXI UNIV
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