Journal
MICROCHIMICA ACTA
Volume 186, Issue 11, Pages -Publisher
SPRINGER WIEN
DOI: 10.1007/s00604-019-3832-8
Keywords
Lignin nanoparticles; Metal nanoparticles; Colorimetric assay; Visual detection
Categories
Funding
- China Postdoctoral Fund [2015 M570419]
- Guangxi Natural Science Fund [2018JJA130224]
- Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control Open Fund [ZR201805-7]
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Lignin nanoparticles (LNPs) were employed as the reducing and stabilizing agent in the preparation of silver nanoparticles (Ag NPs) from silver nitrate under solar light. The Ag NPs were characterized by spectrophotometry, TEM, HRTEM, element mapping, XRD and XPS. The formation of Ag NPs and the structural changes of lignin during the reaction was monitored by analysis via P-31 NMR, H-1 NMR and C-13 NMR. The Ag NPs have uniform shape and an average size of similar to 14 nm. They were loaded onto the surface of LNPs and entangled in lignin. The resulting Ag NP-LNP suspension displays an ultrasensitive and selective optical response to Hg (II) in giving a color change from yellow to colorless. The assay was performed by spectrophotometry at 450 nm. The analytically useful range extends from 5 nM to 100 nM of Hg (II), and the limit of detection is 1.4 nM in deionized water and 1.8 nM in spiked tap water. This is lower than the threshold level (10 nM) in drinking water specified by the US Environmental Protection Agency.
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