Colorimetric detection of Hg2+ using gold nanoparticles synthesized by Trichosporon montevideense WIN

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Abstract
Objective To investigate a simple, cost-effective and eco-friendly method for colorimetric detection of Hg2+ using gold nanoparticles (AuNPs) synthesized by Trichosporon montevideense WIN. Results Hg2+ induced more visible blue shift of SPR band of the AuNPs than other heavy metal ions including Pb2+, Cd2+, Fe3+, Mn2+, Co2+ and Cu2+. The λmax of SPR band exhibited a gradual blue shift from 548 to 537 nm with concentration of Hg2+ increasing (0–200 µM), and the absorbance ratio (A537/A548) showed a positive linear correlation with Hg2+ concentration (R2 = 0.96). AuNPs synthesized at pH 6 showed more obvious blue shift than at pH 5 and pH 7. Through Fourier transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM) analysis, biomolecules coated on the AuNPs were speculated to dominate the formation of a core (Au)-shell (Hg) structure, which resulted in the colorimetric response. Conclusion A sensitive and selective approach to detect Hg2+ using AuNPs synthesized by Trichosporon montevideense WIN is reported for the first time, which can provide a new potential candidate for detecting Hg2+ in the future.
Funding Information
  • National Natural Science Foundation of China (No. 31970107)
  • the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (No. QAK201943)

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