Synthesis of gold nanoparticles protected by L-cysteine and usage in determination of Cu2+ in water samples
LING Jie1,2, LI Rui-qi1, WU Han2, CAO Pan3
1. College of Coal and Chemical Industry, Shaanxi Energy Institute, Xianyang 712000, China; 2. College of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an 710054, China; 3. College of Chemistry & Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, China
Abstract: Gold nanoclusters (L-Cys-AuNCs) with strong fluorescence and good dispersion are synthesized via one-step method by using chloroauric acid (HAuCl4) as gold atom precursor, and L-cysteine (L-Cys) as reductant and protective agent under the reaction conditions of 60℃ and 8 h.The stability of L-Cys-AuNCs and their fluorescence response to Cu2+ in water are investigated.Experiments show that L-Cys-AuNCs will not age when they have been placed in 80 mmol·L-1 NaCl solution within 25 days, and remains good chemical stability.L-Cys-AuNCs probe is not interfered by common cations in water and has a good selectivity to Cu2+.It presents rapidly fluorescence response to Cu2+ and needs a short stabilization time.There is a good linear relationship between the fluorescence intensity of L-Cys-AuNCs probe and the concentration of Cu2+ in the range of 5-200 μmol·L-1.The recovery rate of Cu2+ is in the range of 95.2%-105.3%, and the detection limit is 0.48 μmol·L-1.As a probe for Cu2+, L-Cys-AuNCs can be used for the qualitative and quantitative determination of Cu2+ in real water.
凌洁, 李瑞琪, 吴晗, 曹潘. L型半胱氨酸保护合成纳米金簇及检测水中Cu2+的研究[J]. 现代化工, 2021, 41(10): 238-242.
LING Jie, LI Rui-qi, WU Han, CAO Pan. Synthesis of gold nanoparticles protected by L-cysteine and usage in determination of Cu2+ in water samples. Modern Chemical Industry, 2021, 41(10): 238-242.
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