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Magnetic nanocomposite material, and preparation method and application thereof

A composite material and magnetic nano technology, applied in the field of pollutant degradation, can solve the problems of difficult recovery, metal ion leaching, high cost, etc., and achieve the effects of reducing loss, improving activity, reducing cost and investment

Pending Publication Date: 2021-11-05
QINGDAO AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In AOPs technology, in the process of heterogeneous metal catalyst catalysis, these metal oxides are easy to aggregate or release toxic metal ions into water, which limits their practical application; in actual water treatment applications, in order to achieve For the purpose of degradation, a large amount of catalyst is required, and the cost is high. In addition, not only the performance of the catalyst must be considered, but also whether the catalyst used is stable and whether it will cause secondary pollution. The problems caused by this method such as leaching of harmful metal ions and difficulty in recycling are extremely serious. limit its application

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A preparation method of a magnetic nanocomposite material: comprising the following specific steps:

[0036] S1: Dissolve 1g of chitosan in 100mL of 1% acetic acid solution, stir until completely dissolved;

[0037] S2: 12.08g Cu(NO 3 ) 2 ·3H 2 O, 5.05g Fe(NO 3 ) 3 9H 2 O and 4.69g Al(NO 3 ) 3 9H 2 O was dissolved in 100mL chitosan solution, fully dissolved and complexed to form a mixed solution of hydrotalcite-like precursor;

[0038] S3: Add the hydrotalcite-like precursor mixed solution in step S2 dropwise to the solution containing 5.30g Na 2 CO 3 In the 100mL solution, the dropwise addition is always accompanied by magnetic stirring, and at the same time, the pH value of the system is maintained at 10 with 4mol / L NaOH solution, and the stirring is continued for 12h after the dropwise addition is completed;

[0039] S4: After aging, filter with suction, wash repeatedly with ethanol until the pH value of the filtrate is neutral, freeze-dry the precipitate ...

Embodiment 2

[0050] The preparation method of magnetic nanocomposite material, the method for activating PMS to oxidize and remove TBBPA are consistent with embodiment 1, the difference is that M 2+ / M 3+ The molar ratio x is 2 to 4;

Embodiment 3

[0055] The method for preparing the magnetic nanocomposite material and the method for oxidizing and removing TBBPA by activating PMS are the same as in Example 1, except that the mass fraction of chitosan is 5%-30%.

[0056] The prepared magnetic nanocomposite activates PMS to measure the degradation performance of TBBPA, and the measurement results are as follows: Figure 4 , as an effective metal ion chelating agent, chitosan is added to the preparation process of hydrotalcite-like materials and becomes an effective catalyst carrier. The interaction between materials can improve the stability of the catalyst and reduce the problem of leaching of active metal ions. In addition, the carbon-nitrogen heteroatoms contained in chitosan form C-N bonds in high-temperature environments to form active species with reducing properties to reduce metal oxides, promote the in-situ formation of metal elements, and expose more active sites, effectively The catalytic activity of the catalys...

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PUM

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Abstract

The invention discloses a magnetic nanocomposite material, and a preparation method and application thereof. According to the invention, a hydrotalcite-like compound and chitosan are coupled, and the magnetic nano-metal composite material is prepared by calcining the hydrotalcite-like compound and the chitosan in an inert atmosphere at a high temperature. The method can be used for preparing nanoparticles containing magnetic iron oxide, other metal elementary substances and oxides, and the nanoparticles can be highly dispersed on an atomic level, so more active sites can be exposed, more free radicals can be generated, a good degradation effect can be achieved even under the conditions of low dosage and low PMS concentration, and the purpose of efficiently degrading TBBPA in water is achieved.

Description

technical field [0001] The invention relates to the technical field of pollutant degradation, in particular to a magnetic nanocomposite material, a preparation method and an application. Background technique [0002] Brominated flame retardants (BFRs) are materials that can be combined with plastics, textiles, electrical and electronic products to prevent or slow down the spread of fire, and can self-extinguish fire. TBBPA is currently one of the most widely used brominated flame retardants, accounting for about 60% of the BFRs market, and is mainly used in the flame retardancy of printed circuit boards, insulated wires and various polycarbonate plastics. TBBPA can be combined with polymers in the form of covalent bonds, but due to the incomplete polymerization reaction, the unbound part is easily released into the environment, and it is also very likely to come into contact with the human body. Existing studies have shown that TBBPA is ubiquitous in the environment and can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/745B01J37/03B01J37/08B01J37/16B01J35/10C02F1/72C02F101/36C02F101/34
CPCB01J27/24B01J23/745B01J37/03B01J37/082B01J37/086B01J37/16B01J23/002B01J23/005C02F1/725C02F1/722C02F2305/02C02F2101/36C02F2101/345C02F2101/305B01J35/394B01J35/23B01J35/33B01J35/61B01J21/04B01J23/007B01J37/031B01J37/0238B01J37/08B01J35/30
Inventor 阎清华侯向婷姜立坤辛言君刘国成
Owner QINGDAO AGRI UNIV