Identification of multifunctional graphene-gold nanocomposite for environment-friendly enriching, separating, and detecting Hg2+ simultaneously

Zhengquan Yan, Hongtao Xue, Karsten Berning, Yun Wah Lam, Chun Sing Lee

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)


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 (3σ, n = 20) of 1.6 × 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.

Original languageEnglish
Pages (from-to)22761-22768
Number of pages8
JournalACS Applied Materials and Interfaces
Issue number24
Early online date15 Dec 2014
Publication statusPublished - 24 Dec 2014
Externally publishedYes

Cite this