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Magnetic nanocomposite, and preparation and application thereof

A composite material, magnetic nanotechnology, applied in the field of heavy metal detection in food samples, can solve the problems of difficult separation of GO and solution, and achieve the effects of high accuracy, high sensitivity and good adsorption performance

Inactive Publication Date: 2019-10-29
沈阳信达泰康医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its high dispersibility, hydrophilicity and small particle size, it is difficult to rapidly separate GO from solution by traditional centrifugation and filtration methods

Method used

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  • Magnetic nanocomposite, and preparation and application thereof
  • Magnetic nanocomposite, and preparation and application thereof
  • Magnetic nanocomposite, and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Synthesis of silica-modified magnetic graphene oxide

[0056] (1.1) Synthesis of Magnetic Graphene Oxide

[0057] 0.5 g of graphene oxide (GO) powder and 100 mL of distilled water were added to a three-necked round-bottom flask, followed by mechanical stirring until the bath temperature rose to 70 °C. A total of 2.16g of FeCl 3 ·6H 2 O and 0.80 g FeCl 2 4H 2 O was dissolved in 40 mL of distilled water in a beaker to obtain a clear solution. The mixture was then added to the dispersion at 70°C with vigorous stirring. Afterwards, ammonia solution was added to adjust the pH of the suspension to 12 in order to modify Fe on the surface of GO materials. 3 o 4 Nanoparticles. The mixture was stirred mechanically at 70°C for 60 minutes. Throughout the process, the reaction was protected with pure nitrogen to prevent complete growth and oxidation of the nanoparticle crystals. After the reaction, the magnetic material is separated from the mixture with a magnet. The...

Embodiment 2

[0063] For MGO / SiO 2 Characterization of @coPPy-An nanocomposites

[0064] The size and morphology of the nanocomposites were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM) X-ray diffraction (XRD).

[0065] Observation of GO, MGO, MGO / SiO by Scanning Electron Microscope (SEM) 2 and MGO / SiO 2 @coPPy-An's surface morphology as figure 1 shown. figure 1 a shows that its surface morphology is a smooth, disorderly folded sheet structure, which is a typical structure of GO structure. figure 1 The SEM image of MGO shown in b has a rougher surface compared to GO because of Fe with a diameter of about 30 nm 3 o 4 Nanoparticles (NPs) were attached to the GO surface, and this also confirmed the successful modification of magnetic nanoparticles on the GO surface. According to MGO / SiO 2 SEM image of ( figure 1 c), it can be clearly seen that the surface of the MGO nanocomposite is covered ...

Embodiment 3

[0070] Optimization of MSPE (Magnetic Solid Phase Extraction) Conditions

[0071] In order to understand the influence of experimental variables on the MSPE process, the interaction between the main parameters must be fully considered and each parameter should be optimized. We obtained the optimal conditions of each parameter through the Box-Behnken design (BBD) method of response surface fitting. On the basis of preliminary experiments, the influence of six factors was studied from two levels of extraction process and elution process. like Figure 4 As shown in the results, the optimum operating condition is that the pH value is 5.7, the amount of adsorbent is 19.2mg, and the adsorption time is 6.3min; the eluent volume is 2.9mL, and the eluent concentration is 6.8% (v / v). The desorption time is 3.7min, which can obtain the best adsorption recovery rate.

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Abstract

The invention relates to a magnetic nanocomposite, and preparation and application thereof, belonging to the technical field of detection for heavy metals in food samples. The invention also providesa sensitive and efficient method for detecting heavy metal ions in food samples. A preparation method for the magnetic nanocomposite comprises the following steps: (1) preparing magnetic graphene oxide from graphene oxide, ferric chloride hexahydrate, and ferrous chloride tetrahydrate in an alkaline solution; (2) preparing silica-modified graphene oxide from magnetic graphene oxide and ethyl silicate in anhydrous ethanol; and (3) ) preparing a solid-phase extraction adsorbent, i.e., polypyrrole polyaniline modified-silica coated magnetic graphene oxide from pyrrole, aniline, FeCl3 solid and silica-modified graphene oxide. The prepared magnetic nanocomposite has good adsorption performance and can be used as a magnetic solid-phase extraction adsorbent to extract heavy metals such as Cr(VI)and Pb(II) in food.

Description

technical field [0001] The invention belongs to the technical field of detection of heavy metals in food samples, and relates to a magnetic nanocomposite material and its preparation and application, in particular to a polypyrrole polyaniline modified silicon dioxide-coated magnetic nanomaterial, its preparation and its application in food Application of heavy metal detection in samples. The invention also provides a sensitive and efficient detection method for heavy metal ions in food samples. Background technique [0002] In recent years, the pollution of heavy metals in biological and environmental samples has attracted widespread attention from all over the world. With the development of industrial production and human activities, heavy metals are inevitably discharged into the environment, and they are usually refractory or non-biodegradable. Typical toxic heavy metals, such as Cr(VI) and Pb(II), pose ecological risks to organisms. In addition, toxic elements can grad...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/22B01J20/30B01D15/10G01N1/44G01N1/40G01N27/62
CPCB01J20/20B01J20/0229B01J20/027B01J20/103B01J20/22B01J20/28009B01D15/10G01N1/44G01N1/4044G01N1/4077G01N27/626G01N2001/4094
Inventor 赵龙山张天骄杨育文李三鸣马宏达
Owner 沈阳信达泰康医药科技有限公司
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