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Selective Colorimetric Detection of Nitrite in Water using Chitosan Stabilized Gold Nanoparticles Decorated Reduced
Baishnisha Amanulla1, Selvakumar Palanisamy2,3, Shen-Ming Chen4
1PG & Research department of Chemistry, Thiagarajar College, Madurai-09, Tamilnadu, India.
Scientific Reports
|October 29, 2017
Summary
This study presents a novel gold nanoparticle on reduced graphene oxide sensor for detecting nitrite in water. The sensor offers a sensitive, selective, and visually detectable method for monitoring nitrite levels, crucial for environmental and health safety.
Area of Science:
- Nanomaterials Science
- Environmental Chemistry
- Analytical Chemistry
Background:
- Excess nitrite (NO2-) in water poses risks to human health, including links to stomach cancer.
- Accurate and sensitive detection methods for nitrite are essential for water quality monitoring.
Purpose of the Study:
- To develop a novel sensor for the sensitive and selective detection of nitrite.
- To utilize gold nanoparticles synthesized on reduced graphene oxide for enhanced detection capabilities.
Main Methods:
- Synthesis of gold nanoparticles (AuNPs) on reduced graphene oxide (rGO) using chitosan and succinic acid.
- Characterization of the AuNPs-rGO nanocomposite using techniques like TEM, elemental analysis, XRD, UV-vis, and FTIR.
- Application of the nanocomposite for nitrite detection via UV-vis spectroscopy and visual color change.
Main Results:
- The AuNPs-rGO nanocomposite demonstrated sensitive and selective detection of nitrite.
- Nitrite concentrations correlated with quantifiable changes in UV-vis spectra and visible color shifts (wine red to purple).
- The sensor achieved a linear response from 1 to 20 μM with a detection limit of 0.1 μM for nitrite.
Conclusions:
- The developed AuNPs-rGO nanocomposite serves as an effective sensor for nitrite detection in aqueous solutions.
- The sensor provides both quantitative (UV-vis) and qualitative (visual) estimation of nitrite concentrations.
- This system offers a promising approach for environmental and health-related monitoring of nitrite levels.
