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Organic solvent-free cloud point extraction-like methodology using aggregation of graphene oxide
Dongyan Deng1, Xiaoming Jiang, Lu Yang
1Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu, Sichuan 610064, China.
Analytical Chemistry
|December 5, 2013
Summary
A novel graphene oxide aggregation method efficiently preconcentrates toxic heavy metals from water. This organic solvent-free technique significantly improves detection limits for lead, cadmium, bismuth, and antimony using atomic fluorescence spectrometry.
Area of Science:
- Analytical Chemistry
- Environmental Science
- Materials Science
Background:
- Graphene oxide (GO) is effective for preconcentrating heavy metal ions due to its unique properties and ability to form aqueous colloids.
- Complete collection of GO colloids from water has been a significant challenge in previous methods.
Purpose of the Study:
- To develop a novel, organic solvent-free method for preconcentrating and determining trace toxic metals in aqueous samples.
- To overcome the challenge of complete graphene oxide colloid collection using a triggered aggregation approach.
Main Methods:
- A cloud point extraction-like method utilizing NaCl-induced graphene oxide aggregation for preconcentration.
- Adsorption of lead (Pb(II)), cadmium (Cd(II)), bismuth (Bi(III)), and antimony (Sb(III)) onto dispersed graphene oxide sheets.
- Separation of aggregated GO-analyte complexes and subsequent analysis via atomic fluorescence spectrometry (AFS) or inductively coupled plasma optical emission spectrometry (ICP-OES) using hydride generation or slurry sampling.
Main Results:
- Achieved low limits of detection (LODs) for Pb, Cd, Bi, and Sb using AFS: 0.01, 0.002, 0.01, and 0.006 ng mL(-1), respectively.
- Demonstrated significant improvements in LODs (35- to 37-fold) compared to conventional methods when using AFS.
- Obtained LODs of 0.6, 0.15, 0.1, and 1.0 ng mL(-1) for Pb, Cd, Bi, and Sb using ICP-OES with slurry sampling.
- Successfully applied the method to analyze Certified Reference Materials and real water samples.
Conclusions:
- The developed NaCl-induced graphene oxide aggregation method is effective for preconcentrating and determining trace toxic metals.
- This organic solvent-free approach offers a significant advancement in environmental analysis, providing enhanced sensitivity and efficiency.
- The method shows great potential for the accurate determination of heavy metals in complex aqueous matrices.
