Preparation method and application of magnetic recyclable adsorbent

Abstract

The invention relates to a preparation method and an application of a magnetic recyclable adsorbent. Ferric chloride and ferrous chloride react in an ethylenediamine aqueous solution to prepare iron carbonyl, then an organic phytic acid is taken as a phosphorus source, materials after calcination of waste egg shells are taken as a calcium source, ethylenediamine is taken as a pH regulator, citric acid is taken as an activator, carbonate-doped hydroxyapatite-coated iron carbonyl as a precursor of the magnetic recyclable adsorbent is prepared with a water bath synthesis method, the precursor is pre-oxidized at the temperature of 300-350 DEG C after a sol-gel curing process and then calcined at temperature of 450-600 DEG C, and the magnetic recyclable adsorbent is prepared. The adopted raw materials are sourced from domestic waste, the cost is low, and the prepared material is applied to passivation repair of heavy metal ions in soil and treatment of heavy metal ions in water and has low cost and good effect.

Description

【Technical field】 [0001] The invention relates to a preparation method and application of a magnetic recyclable adsorbent in the field of environmental protection, in particular to a magnetic recyclable adsorbent with ferric iron tetroxide as the core and carbon hydroxyapatite doped with high carbonate radicals as the shell. Magnetic adsorption materials are mainly used in the treatment of heavy metal ions in water bodies and soils. They have low raw material costs, mild preparation conditions, and strong adsorption of metal ions, especially metals Cr(VI), Cu(II), Pb(II) ) has a very good adsorption effect, and has broad prospects for application in domestic wastewater, industrial and mining wastewater treatment, and environmental heavy metal ion restoration. 【Background technique】 [0002] Heavy metals mainly refer to mercury, chromium, lead, cadmium, zinc, cobalt, copper and manganese. Heavy metal pollution comes from a wide range of sources and is very harmful, and its g...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a preparation and application of a magnetic recyclable adsorbent in the field of environmental protection, especially a magnetic and highly carbonate-doped hydroxyapatite-coated trioxide Magnetic adsorbent for iron; ferric chloride and ferrous chloride are used to prepare hydroxy iron to form a magnetic core, and waste egg shells are used as calcium source, and biomass organic phytic acid is used as phosphorus source, which is fixed by chelation of phytic acid Calcium source, at the same time, using the activation of citric acid to expand the pores, in the pre-oxidation process, phytic acid is decomposed to generate carbonate, and at the same time, citric acid is decomposed to expand the pores, and the carbon hydroxyapatite with high carbonate doping and large specific surface area is prepared. The adsorbent coated with ferroferric oxide; the core-shell structure of ferric ferric oxide is used as the core to realize the non-magnetic problem of the adsorbent material, and the source of the organic carbon and oxygen structure is adopted, and in the process of aerobic pre-oxidation and high-temperature calcination, Realize the doping and porosity of hydroxyapatite by the carbonic acid of carbon dioxide itself, and solve the problem that hydroxyapatite, as an adsorbent for sewage treatment, has a small specific surface area and low adsorption capacity. Conventional carbonate-doped hydroxyapatite With the addition of carbonate sources, no pore expansion, and poor selectivity, it has broad prospects for application in domestic wastewater, industrial and mining wastewater treatment, and environmental heavy metal ion restoration.

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