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A kind of magnetic magnesium oxide adsorbent and its preparation method and application

A magnesium oxide, magnetic technology, applied in chemical instruments and methods, adsorption water/sewage treatment, alkali metal oxides/hydroxides, etc., can solve the problem of limited polycyclic aromatic hydrocarbon magnetic materials, and achieve magnetic separation and removal. The effect of high efficiency and short adsorption equilibrium time

Active Publication Date: 2019-10-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the magnetic materials used for the removal of polycyclic aromatic hydrocarbons in water are still very limited, and it is necessary to further study new magnetic adsorption materials and expand their application in the separation and analysis of pollutants

Method used

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  • A kind of magnetic magnesium oxide adsorbent and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0027] Magnetic Fe 3 o 4 / MgO microspheres are prepared according to the following steps: (1) prepare Fe 3 o 4 Nanoparticles: Formulation of FeCl in Ethylene Glycol Solution 3 Mix the solution with sodium acetate, stir it magnetically for 8 hours, transfer the solution to an autoclave, react at 200°C for 10 hours, and after natural cooling, fully wash with absolute ethanol to obtain Fe with a particle size of 100-200nm 3 o 4 Particles, ready for use after vacuum drying; (2) Magnetic Fe 3 o 4 / MgO microspheres preparation: a, the preparation mass fraction is 5%~6% K 2 CO 3 Aqueous solution, adding 0.14% to 0.16% of sodium polyphosphate with a mass fraction of 16% to 18% of Mg(NO 3 ) 2 aqueous solution, transferred to a flask. Heat the solutions configured in a and b above to 70°C respectively, and weigh a certain amount of Fe prepared in step (1). 3 o 4 Nanoparticles were added to 30 μL secondary deionized water, ultrasonically dispersed for 15 min, and K 2 CO 3 T...

Embodiment 2

[0029] Weigh the prepared magnetic magnesium oxide microspheres and add them to the mixed water sample of polycyclic aromatic hydrocarbons, disperse the magnetic particles by ultrasonication for 1 to 5 minutes, and perform vibration adsorption on the obtained suspension. sample separation (eg figure 1 ). The content of polycyclic aromatic hydrocarbons in the mixed water sample is 0.01-5 mg / L.

[0030] In the oscillation adsorption, the amount of magnetic material added is 0.01-4 g / L.

[0031] The oscillating adsorption temperature is 20-40°C, preferably 25°C; the pH value of the mixed water sample during the oscillating adsorption process is 4.0-8.0, and the sodium chloride content is 0-20g / L.

[0032] The vibration frequency of the vibration adsorption is 140-180 rpm, preferably 150 rpm; the vibration time is 5-300 min.

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Abstract

The invention discloses a preparation method and application of a magnetic magnesium oxide adsorbent for adsorbing polycyclic aromatic hydrocarbons in environmental water samples. The magnetic adsorption material is a composite of iron oxide and magnesium oxide. Its preparation method is to use superparamagnetic iron ferric oxide nanoparticles as heterogeneous seeds to add to the precursor solution of magnesium oxide, obtain precipitates after self-assembly and aging, and calcinate the precipitates at high temperature to obtain particles with a particle size of 5 ~10 μm magnetic magnesium oxide microspheres. The preparation method provided by the invention is simple, fast, low in cost and environmentally friendly; the prepared material is used as an adsorbent to remove polycyclic aromatic hydrocarbons in water, and has the advantages of fast adsorption speed, large adsorption capacity, easy separation and good selectivity.

Description

technical field [0001] The invention relates to a magnetic magnesium oxide adsorbent, a preparation method and application thereof, and belongs to the field of preparation and application of magnetic materials. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of organic pollutants that widely exist in the environment, mainly originating from the incomplete combustion of hydrocarbons and organic matter. Because PAHs are not easy to degrade, the treatment of PAHs in the environment is still relatively difficult. In addition, some polycyclic aromatic hydrocarbons have teratogenic and carcinogenic properties, and can accumulate in water, soil and other environmental media, eventually causing harm to environmental safety and human health. [0003] The removal of PAHs from environmental samples mainly utilizes physical adsorption, biodegradation and chemical methods. Among them, physical adsorption is one of the effective methods to remove pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F101/32
Inventor 陈吉平谭冬芹金静李芳倪余文王刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI