Cellulose semipermeable membrane-coated nanometer Fe3O4 solid-phase extractant and its preparation method and use

Abstract

The invention discloses a cellulose semipermeable membrane-coated nanometer Fe3O4 solid-phase extractant and its preparation method and use. Surfaces of magnetic nanometer Fe3O4 particles are modified by a surfactant and then are coated with a cellulose semipermeable membrane so that the cellulose semipermeable membrane-coated nanometer Fe3O4 solid-phase extractant is obtained. The preparation method comprises the following steps of 1, preparing Fe3O4 magnetic nanometer particles by a coprecipitation method, 2, adding the surfactant in an aqueous solution of the Fe3O4 magnetic nanometer particles, wherein the surfactant is absorbed on the surfaces of the Fe3O4 magnetic nanometer particles by a self-assembling method, and 3, coating the cellulose semipermeable membrane on the surfaces of the Fe3O4 magnetic nanometer particles. The cellulose semipermeable membrane-coated nanometer Fe3O4 solid-phase extractant has the advantages of large adsorption capacity, fast extraction speed, simple preparation processes, good environmental benefits, strong anti-interference capability and high yield. In an applied magnetic field, the cellulose semipermeable membrane-coated nanometer Fe3O4 solid-phase extractant can be separated from a base solution conveniently.

Description

technical field [0001] The invention relates to a cellulose coating-surfactant modification-nanometer iron oxide solid phase extraction agent. [0002] Another object of the present invention is to provide a method for preparing the above-mentioned solid-phase extractant. [0003] The present invention also relates to the application of the above-mentioned solid-phase extractant in separating and enriching organic pollutants in natural water bodies. Background technique [0004] The background and development status of this technical field are roughly as follows: rapid, accurate and effective analysis and determination of trace organic pollutants in complex environmental water samples is a difficult point in environmental analytical chemistry. Since the composition of environmental water samples is extremely complex, and the content of pollutants is usually extremely low, the pretreatment of environmental water samples has become an indispensable link in a complete analysis...

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Problems solved by technology

Natural organic matter widely exists in all surface ecosystems. The dissolved natural organic matter in natural water is a heterogeneous mixture with a complex structure, with molecular weights ranging from hundreds to millions. Such macromolecular substances are often adsorbed to The surface of the extractant will block the pore size of the packing, reduce the column efficiency, reduce the adsorption capacity, shorten the life of the extraction column, and finally cause serious interference to the analysis and determination of small molecules[1,2]

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