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Updated: May 30, 2026

Preparation of Expanded Chitin Foams and their Use in the Removal of Aqueous Copper
Published on: February 27, 2021
Sensitive and selective detection of copper ions based on the aggregation of chitosan-stablized silver nanoparticles
Ying Zuo1, Hua Wen Zhao, Cheng Zhi Huang
1College of Chemistry and Chemical Engineering, MOE Key Laboratory for Luminescence and Real-Time Analysis, Southwest University, Chongqing 400718, PR China.
Abstract:
In this contribution, we present a simple and sensitive method for detecting Cu2+ based on the Cu(2+)-induced aggregation of silver nanoparticle (AgNPs) capped with chitosan. Chitosan could be adsorbed on the surface of AgNPs, and keep AgNPs against aggregation. However, in the presence of Cu2+, AgNPs aggregate again, the absorption decreases, and the color changes from yellow to colorless, which is due to the coordination of Cu2+ and chitosan. The depressed intensity (deltaA) is in proportion to the concentration of Cu2+ over the range of 3.33-40.0 microM with the limit of detection (3sigma) of 10.25 nM, the recovery of 92.60-104.20% and R.S.D. of 0.94-4.62%. The advantages of this method are simple, sensitive and low cost.
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