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Preparation and application of alginic acid polymer coated Fe3O4@C18 magnetic nano solid phase extractive agent

A solid phase extraction agent and magnetic nanotechnology, applied in chemical/physical processes, other chemical processes, ion exchange, etc., can solve problems such as difficult to disperse, difficult to achieve extraction target pollutants, difficulties, etc., to achieve fast extraction speed, Inexpensive and easy to operate

Inactive Publication Date: 2009-07-22
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

Nanomaterials have a high specific surface area and excellent adsorption performance, but due to the fineness of the nanoparticles, it is difficult to carry out the above-mentioned solid-phase extraction on the column
C18 silica gel is a commonly used solid-phase extraction material, and C18-modified magnetic nano-Fe with superparamagnetism 3 o 4 (Fe 3 o 4 @C18) has also been used to extract organic pollutants in recent years [1-3], but due to Fe 3 o 4 @C18 has strong hydrophobicity, making it difficult to disperse stably in aqueous solution, and it is difficult to achieve the purpose of extracting target pollutants from large volumes of water samples

Method used

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  • Preparation and application of alginic acid polymer coated Fe3O4@C18 magnetic nano solid phase extractive agent

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Embodiment Construction

[0017] Alginate polymer-coated Fe 3 o 4 The preparation method of @C18 magnetic nano-solid phase extraction agent can be divided into three steps in detail: 1. Preparation of nano-iron oxide. First, 2.0g FeCl 3 ·6H 2 O and 5.2 g FeCl 2 4H 2 O and 0.85mL of concentrated hydrochloric acid were dissolved in 25mL of N 2 In a degassed aqueous solution; under vigorous mechanical stirring, add the above solution dropwise to 250mL 1.5mol / L NaOH aqueous solution, and continue to stir and react for 0.5 hours after the dropwise addition; after the reaction, use an external magnetic field to prepare magnetic nanoparticles were separated. 2. Fe 3 o 4 Preparation of @C18. will get Fe 3 o 4 The magnetic particles were washed twice with absolute ethanol, then washed twice with toluene, then dispersed into 80mL toluene, added 1mL octadecyltriethoxysilane, stirred evenly, placed in a 100mL reactor and sealed, at 120°C After reacting for 12 hours, the obtained Fe 3 o 4 @C18 Wash of...

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Abstract

The invention belongs to the field of chemical analysis test instruments, and relates to a Fe3O4 magnetic nanometer solid-phase extractant which is coated by alginic acid polymers and modified by C18 silane. The extractant has the magnetic separation ability of the magnetic material, strong extraction ability of the C18 and good hydrophilic property, an ion channel and size extrusion functions of the alginic acid polymer, so that the extractant is quite suitable for the large-scale batch pre-treatment of water sample with large volume. The pollutants of alkyl phenol, phthalate ester, polycyclic aromatic hydrocarbon, full fluorine, and the like are taken as representatives of common pollutants in the water sample. For 500mL of environmental water sample, 0.1g of the extractant is used, and the efficiency of extracting the organic pollutants all reaches more than 85 percent.

Description

technical field [0001] The invention belongs to the field of chemical analysis testing instruments and equipment, and relates to a novel C18 silane-modified Fe coated with alginic acid polymer 3 o 4 Nano solid-phase extraction agent, which is used as a sample pretreatment material to enrich organic pollutants in large-volume environmental water samples. Background technique [0002] The background and development status of this technical field are roughly as follows: Solid phase extraction is a relatively new environmental sample pretreatment method widely used at present. Solid phase extraction has the advantages of short extraction time, high recovery rate, high enrichment factor and low reagent consumption. Nanomaterials have a high specific surface area and excellent adsorption performance, but due to the fineness of the nanoparticles, it is difficult to carry out the above-mentioned solid-phase extraction and pass through the column. C18 silica gel is a commonly used...

Claims

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Application Information

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IPC IPC(8): B01J20/22B01J20/30B01D15/08
Inventor 蔡亚岐张升晓
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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