Citation: Hong LI, Xiaoying DING, Cihang LIU, Jinghan ZHANG, Yanying RAO. Detection of iron and copper ions based on gold nanorod etching colorimetry[J]. Chinese Journal of Inorganic Chemistry, ;2024, 40(5): 953-962. doi: 10.11862/CJIC.20230370 shu

Detection of iron and copper ions based on gold nanorod etching colorimetry

Hong LI ^{1, 2} ,
Xiaoying DING ² ,
Cihang LIU ² ,
Jinghan ZHANG ² ,
Yanying RAO ^2,,

1.
College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350000, China
2.
Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Key Laboratory of Ecological Environment and Information Atlas, Fujian Provincial University, College of Environmental and Biological Engineering, Putian University, Putian, Fujian 351100, China

Corresponding author: Yanying RAO, yanyingrao@ptu.edu.cn
Received Date: 8 October 2023
Revised Date: 13 January 2024

Figures(9)

In an acidic environment, Fe³⁺ and Cu²⁺ reacted with KI solution to oxidize I^- to I₂, and I₂ was used to etch Au nanorods (AuNRs) to produce a blue shift of the longitudinal surface plasmon resonance (LSPR) absorption peak of AuNRs to achieve the detection of Fe³⁺ and Cu²⁺. At a reaction temperature of 50 ℃, 0.8 mL HCl (0.1 mol· L^-1), 2 mL KI (20 mmol· L^-1), and 2 mL AuNRs solution were added in 2 mL 500 μmol·L^-1 of Fe³⁺ or 30 μmol·L^-1 of Cu²⁺ solution, and the Fe³⁺ or Cu²⁺ solution could etch AuNRs until the LSPR absorption peak of AuNRs disappeared after 25 or 90 min. The concentrations of Fe³⁺ and Cu²⁺ had a good linear relationship with the LSPR absorption peak shift of AuNRs, and the R² was above 0.99. This method has excellent selectivity and accuracy for the detection of Fe³⁺ and Cu²⁺, with a maximum error of only 0.69% and 2.6%, respectively. For the detection of Fe³⁺ and Cu²⁺ coexistent system, the addition of an appropriate amount of F^- in Fe³⁺ solution to form a complex [FeF₆]^3- can chemically mask Fe³⁺, which can eliminate the interference of Fe³⁺ in the coexistence system. The results showed that in a Cu²⁺ concentration range of 0-20 μmol·L^-1, the LSPR absorption peaks of AuNRs before and after the addition of Fe³⁺-F^- masking system were blue-shifted 217 and 210 nm, respectively. There was a good linear relationship between the Cu²⁺ concentration and the LSPR absorption peak shift of AuNRs, and the R² was above 0.99. It can be concluded that the accurate detection of Cu²⁺ in the mixed system can be achieved by chemically masking the Fe³⁺ in the coexisting ions.
- gold nanorod,
- iron ion,
- copper ion,
- colorimetric detection
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