Titanic acid nano material absorbent and preparation method thereof

Abstract

The invention provides a titanic acid nano material absorbent for enriching and / or purifying the organic pollutant in the biological and / or environmental samples and a preparation method thereof. The absorbent provided by the invention is a titanic acid nano tube modified by a hydrophobic group and a hydrophilic group simultaneously, preferred a titanic acid nano tube modified by C18 and aminopropyl, which can be uniformly dispersed in the water solution and has high adsorption capacity and better selectivity to the perfluorochemical in virtue of the mixed mechanism of the hydrophobic functionand the electrostatic attraction, and is especially suitable for the enrichment and / or purification of the perfluorooctane sulfonate and the perfluorooctane carboxylic acid in the biological and / or environmental samples. The absorbent provided by the invention is prepared by a hydrothermal method and an sol-gel method. The reagent and device are simple and cheap and the repeatability is good.

Description

technical field [0001] The invention belongs to the field of chemical analysis testing instruments and equipment, and relates to a titanic acid nanomaterial adsorbent for enriching and / or purifying organic pollutants in biological and / or environmental samples and a preparation method thereof. Background technique [0002] Perfluorinated compounds are a class of persistent organic pollutants that widely exist in various environmental media, and are common in the world. The international environmental science community has formed an upsurge in the study of perfluorinated compound pollution, which has become the frontier of environmental science research. Among them, perfluoroalkyl sulfonic acid and perfluoroalkyl carboxylic acid are the two most important types of perfluorinated compounds. Their vapor pressure and volatility are small, and they have strong polarity and high water solubility. For most environmental samples, due to the low concentration of perfluorinated compou...

AI Technical Summary

Problems solved by technology

The commonly used extraction solvents in ion-to-liquid-liquid extraction are methyl tert-butyl ether (MTBE), acetonitrile and methanol. This method uses a large amount of extraction agents when processing environmental water samples, and the operation is cumbersome, which is not conducive to human health. And environmental protection, low efficiency, poor extraction recovery, sometimes seem powerless to low concentration and complex matrix samples

Commonly used solid phase extraction C 18 and C 8 Silica gel column, a few polymer columns are also used. This method has poor extraction ability for polar and water-soluble perfluoroalkyl sulfonic acids and perfluoroalkyl carboxylic acids, which is not conducive to the enrichment of large volumes of water samples, and the determination sensitivity does not meet the requirements, and C 18 and C 8 The strong hydrophobicity of the silica gel extractant causes them to be in close contact with the water sample solution, resulting in poor extraction effect and low recovery rate, and the extractant must be pretreated before extracting the water sample, which also causes extreme difficulties in the extraction operation. big inconvenience

Low extraction efficiency will lead to a decrease in the accuracy and specificity of the instrument's determination, and it will not be possible to obtain reliable results

In addition, the commonly used broad-spectrum adsorbent is activated carbon, which has a strong adsorption capacity for most organic pollutants in water, especially for organic substances with strong hydrophobicity, but does not have the ability of selective adsorption.

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