Magnetic magnesia adsorbent, preparation method therefor and application of magnetic magnesia adsorbent

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

Active Publication Date: 2017-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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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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  • Magnetic magnesia adsorbent, preparation method therefor and application of magnetic magnesia adsorbent

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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 1-5 minutes, and perform vibration adsorption on the obtained suspension. After the adsorption is completed, use an external magnetic field to separate the magnetic material and water 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 for a magnetic magnesia adsorbent for adsorbing polycyclic aromatic hydrocarbons from environment water samples and an application of the magnetic magnesia adsorbent. The magnetic adsorption material is a composite of ferric oxide and magnesia. The preparation method comprises the steps of adding super-paramagnetism ferroferric oxide nanoparticles into a precursor solution of magnesia as heterogeneous seed crystals, carrying out self-assembly and aging so as to obtain precipitates, and carrying out high-temperature calcination on the precipitates, thereby obtaining magnetic magnesia microspheres with the grain size of 5 to 10 microns. The preparation method provided by the invention is simple, rapid and environmentally friendly and is low in cost; and the prepared material is used for removing the polycyclic aromatic hydrocarbons from water as an adsorbent and has the advantages that the adsorption rate is high, the adsorption capacity is high, the separation is easy, the selectivity is good, and the like.

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 Applications(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
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