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| Detection of iron and copper ions based on gold nanorod etching colorimetry |
| Author Name | Affiliation | E-mail | | LI Hong | College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350000, China
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 | | | DING Xiaoying | 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 | | | LIU Cihang | 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 | | | ZHANG Jinghan | 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 | | | RAO Yanying | 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 | yanyingrao@ptu.edu.cn |
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| Abstract: 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. |
| Keywords: gold nanorod iron ion copper ion colorimetric detection |
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| LI Hong,DING Xiaoying,LIU Cihang,ZHANG Jinghan,RAO Yanying.Detection of iron and copper ions based on gold nanorod etching colorimetry[J].Chinese Journal of Inorganic Chemistry,2024,40(5):953-962. |
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