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One-pot preparation of grapheme-Ag nano composite for selective and environmentally-friendly recognition of trace mercury(II)

yanzhengquan 添加于 2016/11/17 21:45:26  253次阅读 | 0次推荐 | 0个评论

A graphene–silver nano composite (G–Ag NPs) has been identified and prepared by a simple one-pot redox method using ascorbic acid as the catalytic reagent. After its structure was characterized by UV-vis spectroscopy, Raman spectroscopy and transmission electron microscopy, the absorption spectral properties were investigated in detail. The characteristic absorption peak of the as-prepared G–Ag NPs at ca. 420 nm could be selectively quenched upon addition of Hg2+ in the presence of ascorbic acid, owing to the formation of a specific amalgam between mercury and silver nano particles. Under pH 5.0, the response possessed an excellent selectivity and sensitivity to Hg2+ over the linear range of 2.0  107 to 3.25  106 M with a detection limit of 3.1  108 M. Other commonly existing metal ions had almost no influence on the absorption response. Importantly, the proposed low-toxicity G–Ag NPs were successfully applied to detect trace Hg2+ in three real environmental water samples with a relative standard deviation (R.S.D.) of less than 4.6% (n ¼ 5) and with little secondary pollution.

作 者:Zhengquan Yan*, Lei Hu, Li Nie, Maojin You
期刊名称: RSC Advances
期卷页: 2016 第6卷 第期 109857–109861页
学科领域:化学科学 » 分析化学 » 光谱分析
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原文链接:http://pubs.rsc.org/en/content/articlelanding/2016/ra/c6ra16810h/unauth#!divAbstract
DOI: 10.1039/C6RA16810H
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