期刊
MATERIALS
卷 12, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/ma12091533
关键词
nanoparticles; nanoplates; spectral blue shift; amalgam; water quality
类别
资金
- Ontario Centers of Excellence Voucher for Innovation and Productivity I program
- International Research Support Initiative Program grant by the Higher Education Commission (HEC) Islamabad, Pakistan
The emission of mercury (II) from coal combustion and other industrial processes may have impacts on water resources, and the detection with sensitive but rapid testing methods is desirable for environmental screening. Towards this end, silver nanoprisms were chemically synthesized resulting in a blue reagent solution that transitioned towards red and yellow solutions when exposed to Hg2+ ions at concentrations from 0.5 to 100 mu M. A galvanic reduction of Hg2+ onto the surfaces is apparently responsible for a change in nanoprism shape towards spherical nanoparticles, leading to the change in solution color. There were no interferences by other tested mono- and divalent metal cations in solution and pH had minimal influence in the range of 6.5 to 9.8. The silver nanoprism reagent provided a detection limit of approximately 1.5 mu M (300 mu g/L) for mercury (II), which compared reasonably well with other reported nanoparticle-based techniques. Further optimization may reduce this detection limit, but matrix effects in realistic water samples require further investigation and amelioration.
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