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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Updated: Apr 1, 2026

Procedure for Fabricating Biofunctional Nanofibers

Procedure for Fabricating Biofunctional Nanofibers

Published on: September 10, 2012

Disks solid phase extraction based polypyrrole functionalized core-shell nanofibers mat.

FeiFei Qi¹, XiaoQing Li¹, BiYi Yang¹

¹Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing 210009, China.

|October 11, 2015

Summary

This summary is machine-generated.

A new polypyrrole (PPy) nanofibers mat-based solid phase extraction (SPE) disk effectively extracts trace polar analytes from water. This method offers high recovery and low detection limits for environmental water analysis.

Keywords:

Disks solid-phase extraction (SPE)Polypyrrole (PPy) nanofibers mat Sulfonated azo dyes Water pollutants

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Area of Science:

Environmental Chemistry
Analytical Chemistry
Materials Science

Background:

Extraction of trace polar analytes from environmental water samples is crucial for monitoring water quality.
Existing methods for polar analyte extraction often face challenges with efficiency, detection limits, and matrix interferences.

Purpose of the Study:

To develop and evaluate a novel solid phase extraction (SPE) technique using polypyrrole (PPy) functionalized core-shell electrospun nanofibers.
To assess the effectiveness of the PPy nanofibers mat-based disks SPE for the extraction of trace polar analytes, specifically sulfonated azo dyes, from environmental water samples.

Main Methods:

Fabrication of a novel disks solid phase extraction (SPE) device utilizing polypyrrole (PPy) functionalized core-shell electrospun nanofibers.
Optimization of SPE conditions for the extraction of target analytes (disulphonated and monosulphonated azo dyes).
Evaluation of the method's performance, including detection limits, enrichment coefficients, and recoveries in environmental water samples.

Main Results:

The PPy nanofibers mat-based disks SPE achieved low detection limits (0.15-0.3 μg/L) and high enrichment coefficients (106-121) for target azo dyes.
Recoveries of sulfonated azo dyes ranged from 87.6-112.3%, indicating minimal matrix interference in environmental water samples.
The developed SPE technique demonstrated superior recovery, lower detection limits, and better precision compared to existing methods, with a miniaturized design using only 2.5 mg sorbent and 500 μL eluent.

Conclusions:

The polypyrrole (PPy) nanofibers mat-based disks SPE is a highly effective and promising device for the efficient extraction of trace polar species from water samples.
This miniaturized SPE technique offers a simple, fast, and sensitive approach for environmental water analysis, reducing sorbent and eluent consumption.