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Preparation method and application of carboxylated single-walled carbon nanotube-alginic acid solid phase extracting disk

A single-walled carbon nanotube, carbon nanotube technology, applied in inorganic chemistry, other chemical processes, alkali metal compounds, etc., can solve the problems of poor extraction and enrichment capacity, high price, and few solid-phase extraction disks, and achieves operation Simple, easy to save, wide-ranging effects

Inactive Publication Date: 2010-03-10
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction disk has a good enrichment ability for weak polarity and some medium polarity organic pollutants, but poor extraction and enrichment ability for polar and strong polarity organic pollutants
So far, the types of solid phase extraction discs are still far less than solid phase extraction columns, and their prices are much higher than the latter

Method used

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  • Preparation method and application of carboxylated single-walled carbon nanotube-alginic acid solid phase extracting disk
  • Preparation method and application of carboxylated single-walled carbon nanotube-alginic acid solid phase extracting disk
  • Preparation method and application of carboxylated single-walled carbon nanotube-alginic acid solid phase extracting disk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1 : Preparation of SWCNT-COOH-alginate solid-phase extraction disk

[0032] This example is the preparation method of the SWCNT-COOH-alginate extraction disk of the present invention. The following combination figure 1 The preparation method of the carboxylated single-walled carbon nanotube extraction disk covered with alginate polymer is described in detail as follows:

[0033] First, the dispersion of carbon nanotubes. Take by weighing 60mg carboxylated single-walled carbon nanotubes (Times Nanomaterials Company, Chengdu; outer diameter and inner diameter are 1.5-2.5nm and 1.0-2.0nm respectively; specific surface area 297.72m 2 / g, purity 95%) was added to 50mL of 5% sodium dodecylsulfonate solution, and ultrasonicated for 30-60min.

[0034] Second, carboxylated single-walled carbon nanotube films were prepared. The obtained fully dispersed carboxylated single-walled carbon nanotube suspension was filtered under negative pressure with a quantitative filt...

Embodiment 2

[0038] Example 2 : The morphology of the SWCNT-COOH-alginate solid-phase extraction disk of the present invention

[0039] This example is the morphology and structure of the SWCNT-COOH-alginate solid phase extraction disk of the present invention:

[0040] With digital camera and scanning electron microscope S-3000N (SEM, Hitachi), the SWCNT-COOH-alginate extraction disk of the present invention is carried out morphology observation (see figure 2 and image 3 ). The diameter of the homogeneous extraction disk is 47mm, the surface particles are evenly distributed, and there is no block structure; the thickness of the carbon nanotube film on the extraction disk is consistent, between 35-40μm, and the density of carboxylated single-walled carbon nanotubes on the extraction disk is 0.86 -0.99mg / cm 3 . From the cross-sectional view of the extraction disc, it can be seen that during the preparation of the extraction disc, the carbon nanotube particles form a carbon nanotube ...

Embodiment 3

[0041] Example 3 : The extraction performance test of SWCNT-COOH-alginate extraction disk of the present invention

[0042] This example is an experiment of extracting and enriching organic pollutants in water samples with the SWCNT-COOH-alginate extraction disk of the present invention.

[0043] The experimental method is as follows: Figure 4 As shown, the solid phase extraction disc was activated with 10mL methanol before use, and then cleaned with 10mL Milli-Q water to clean the methanol. Water samples were extracted using a vacuum filter. Different volumes of water samples can be pre-treated through the activated extraction disk. After all the water samples pass through the extraction disk, you can pump it for about 5 minutes to remove the residual water, then use 10-15mL acetonitrile or acidic acetonitrile solution to elute the extraction disk, and collect the eluate with a test tube. During this process, the eluent is added dropwise along the inner wall of the glas...

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Abstract

The invention provides a carbon nanotube solid phase extracting disk for enriching and / or separating organic pollutants in an environmental sample and a preparation method thereof. The extracting disktakes a carboxylated single-walled carbon nanotube as a core and is covered with a hydrophilic polymer on the outer layer, and preferably, a carboxylated single-walled carbon nanotube extracting diskcovered with the hydrophilic polymer. The extracting disk simultaneously combines small grain diameter, high extraction speed, large special surface area of nano material, strong adsorption capacityof carbon nanotubes, electrostatic adherence of surface carboxyl as well as fine hydrophilicity and volume exclusion of an alginic acid polymer and also has higher enrichment and extraction capacity to endocrine disrupters and sulfonamides. In addition, the extracting disk is simple to prepare, low in cost and very suitable for rapidly preprocessing large-scale and large-volume water samples in batch.

Description

technical field [0001] The invention belongs to the field of chemical analysis testing instruments and equipment, and relates to a novel carboxylated single-walled carbon nanotube-alginic acid solid-phase extraction disc for rapid enrichment and / or separation of organic pollutants in large-volume environmental water samples. Background technique [0002] Solid-phase extraction is a relatively new environmental sample pretreatment method widely used at present. It has the advantages of short extraction time, high recovery rate, high enrichment factor and low consumption of organic reagents. Solid-phase extraction technology has gradually replaced traditional liquid-liquid extraction and has become the main separation and enrichment method in sample pretreatment. In-phase extraction cartridges and solid-phase extraction disks are the two main operating forms of solid-phase extraction technology. The particle size of the adsorbent constituting the solid phase extraction disk i...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/28B01J20/30
Inventor 蔡亚岐牛红云
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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