Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 24, Pages 22761-22768Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am506875t
Keywords
graphene-Au nanocomposite; environment-friendly; Hg2+; enrichment and separation; colorimetric detection
Funding
- City University of Hong Kong via a Strategic Research Grant [7004008]
- National Natural Science Foundation of China [21277103]
- Anhui Provincial Natural Science Fund
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By virtue of the specific amalgam of mercury with gold and high specific area of a graphene scaffold, an environment-friendly multifunctional graphene-gold nanocomposite (G-AuNPs) has been identified and prepared by a simple one-pot redox reaction. The resultant G-AuNPs can reversibly enrich about 94% of Hg2+ in water samples, which can be further separated by only a simple filtration. Importantly, the color of the G-AuNPs suspension exclusively changes from purple-red to light brown upon the addition of Hg2+ in the presence of ascorbic acid, which can be applied for colorimetric detection of Hg2+ with a detection limit (3s, n = 20) of 1.6 x 10(-8) mol.L-1. Furthermore, using ascorbic acid as reducing agents, both the preparation process and the resultant nanocomposite are nontoxic. To the best of our knowledge, this is the first report to enrich, separate and detect Hg2+ contaminant simultaneously without causing any secondary pollution.
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