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Preparation and application of magnetic nano-composite material gamma-Fe2O3/PDA (Polydopamine)-GA (Gallic Acid)

A composite material and magnetic nano technology, applied in the direction of material electrochemical variables, alkali metal compounds, water/sewage treatment, etc., can solve secondary pollution, heavy metal ion detection and adsorption simplification, no effective solution to heavy metal ion detection in water Integration with adsorption and other issues to achieve the effect of improving adsorption capacity, high sensitivity, and low detection offline

Inactive Publication Date: 2014-04-16
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing literature on the detection and adsorption of heavy metal ions in the water environment is too simple, and the synthesized composite material does not effectively solve the problem of the integration of heavy metal ion detection and adsorption in water.
In addition, after the surface of these materials is functionalized, some non-degradable substances are introduced, which is easy to cause secondary pollution

Method used

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  • Preparation and application of magnetic nano-composite material gamma-Fe2O3/PDA (Polydopamine)-GA (Gallic Acid)
  • Preparation and application of magnetic nano-composite material gamma-Fe2O3/PDA (Polydopamine)-GA (Gallic Acid)
  • Preparation and application of magnetic nano-composite material gamma-Fe2O3/PDA (Polydopamine)-GA (Gallic Acid)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Magnetic nanocomposite γ-Fe 2 o 3 The preparation method of / PDA-GA, its step is as follows:

[0029] (1) Dissolve 0.5 g PVP in 20 mL EG, add 2.5 mmol FeCl to the above mixture 3 ·H 2 O (0.6757 g) and 15 mmol NaAc (1.2304 g) were uniformly dispersed by ultrasonic, then moved to a microwave reactor and kept at 200 °C for 10 h. After cooling to room temperature, the obtained nanomaterials were cleaned with a 3:1 (V / V) ethanol-water mixture, and moved into an oven at 150 °C for 2 h;

[0030](2) 200 mg of dopamine hydrochloride (DA·HCl) was dissolved in 20 mL of Tris-HCl buffer solution with pH=8.5, stirred for 1 h, and recorded as solution 1. Another 100 mg of γ-Fe 2 o 3 It was also dissolved in 20 mL of Tris-HCl buffer solution with pH=8.5, and the solution was uniformly dispersed under the action of ultrasound and stirring, which was recorded as solution 2. Solutions 1 and 2 were mixed and stirred for 6 h. The obtained nanomaterials were cleaned with a 3:1 (V / V...

Embodiment 2

[0038] Take 1 mg γ-Fe respectively 2 o 3 , γ-Fe 2 o 3 / PDA and γ-Fe 2 o 3 / PDA-GA is placed on the weighing paper, and then the weighing paper is folded into a side size of 0.25 cm 2 , moved into a vibrating sample magnetometer to measure the saturation magnetization of these three nanomaterials, and the scanning range of the magnetic field was -10000-10000 Oe. Such as figure 2 It can be seen from the figure that with the introduction of polydopamine and gallic acid, the saturation magnetization of the material gradually decreases (74.8 emu·g -1 →64.8 emu·g -1 →62.4 emu·g -1 ), but γ-Fe 2 o 3 / PDA and γ-Fe 2 o 3 / PDA-GA have basically the same saturation magnetization. The small picture shows that the final product is ultrasonically dispersed in water, and then moved to the side of the magnet. After 20 s, it can be found that the solution becomes clear, indicating that the synthesized material still has strong magnetic properties and is easy to separate.

Embodiment 3

[0040] Prepare 10 mg·L -1 γ-Fe 2 o 3 / PDA-GA aqueous solution, pipette 5 μL of the solution onto the glassy carbon electrode. After the surface of the electrode is dried, respectively with different (A) Cu 2+ and (B)Pb 2+ The concentration (0.25 μM, 0.5 μM, 0.75 μM, 1 μM, 1.25 μM, 1.5 μM, 1.75 μM, 2 μM, 2.25 μM) of HAc / NaAc (0.1M, pH=4.5) buffer is the electrolyte, and the enrichment voltage : -1.2 V; enrichment time: 150 s; amplitude: 25 mV; potential increment: 4 mV; scan range: -1.2-0.5 V. The relationship between the peak current at the peak potential, such as image 3 shown. It can be seen from the figure that as the concentration of metal ions increases, the corresponding corresponding peak current gradually increases, and metal ions still have a high response peak current at low concentrations; it can be seen from the small figure that: fitting The current-concentration curve has better linearity, for Cu 2+ and Pb 2+ The sensitivity reaches 4.679 μA·μM -1 and...

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Abstract

The invention discloses preparation and application of magnetic nano-composite material gamma-Fe2O3 / PDA (Polydopamine)-GA (Gallic Acid). The preparation comprises the following steps of carrying out a hydrothermal reaction and calcinations to obtain a gamma-Fe2O3 nano particle carrier by taking FeCl3.6H2O with low price as an iron source, ethylene glycol (EG) as a reducing agent, polyvinylpyrrolidone (PVP) as a dispersing agent and a protective agent, and natrium aceticum (NaAc) as an alkali source; then wrapping a layer of polydopamine (PDA) in a buffer solution of tris (hydroxymethyl) aminomethane-hydrochloric acid (Tris-HCl) with pH of 8.5; and finally introducing gallic acid (GA) to an ethanol system by using 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride and n-hydroxysuccinimide as cross-linking agents, wherein a specific synthetic schematic diagram is seen in attached drawing 1. Then the adsorption effects of the synthesized magnetic nano-particle on metal ions Cu<2+> and Pb<2+> are discussed, the detection effects of a glassy carbon electrode modified by the magnetic nano-particle on the metal ions Cu<2+> and Pb<2+> are researched. Results show that gamma-Fe2O3 / PDA-GA has excellent detection and adsorption effects on heavy metal ions in a water environment.

Description

technical field [0001] The invention belongs to the preparation technology of novel nanocomposite materials, in particular to a magnetic nanocomposite material γ-Fe 2 o 3 / PDA-GA preparation and application, this new magnetic nano-adsorption material has both detection and adsorption functions for heavy metal ions in the water environment. Background technique [0002] As the source of human life, water plays an irreplaceable role in the evolution of the entire human process. With the rapid development of the economy and the sharp increase in the demand for human social activities, the pollution of the water environment is becoming more and more serious, and the pollution of heavy metal ions is particularly serious, which has seriously threatened people's health. [0003] The detection and adsorption of heavy metal ions in water environment is a research hotspot at home and abroad. Commonly used detection methods include complexometric titration, spectroscopy, chromatogra...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/28B01J20/30C02F1/28C02F1/62G01N27/48
Inventor 单丹黄寒阚锦晴邓盛元
Owner NANJING UNIV OF SCI & TECH
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