期刊
NANOSCALE
卷 7, 期 5, 页码 2042-2049出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4nr06726f
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资金
- National Natural Science Foundation of China [21025520, 21105018, 21222502, 20933008, 91213305]
- Ministry of Science and Technology [2012CB933001, 2011CB933201]
- Beijing Natural Science Foundation [2122058]
- Youth Innovation Promotion Association (CAS)
- CAS/SAFEA International Partnership Program for Creative Research Teams
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA09030305]
- National High Technology Research and Development Program of China [2012AA030308, 2012AA022703]
We report a method for rapid, effective detection of both Cr(III) and Cr(VI) (in the form of Cr3+ and Cr2O72-, the main species of chromium in the natural environment) by making use of meso-2,3-dimercaptosuccinic acid (DMSA)-functionalized gold nanoparticles (Au NPs). The limit of detection (LOD) is 10 nM with the naked eye and the assay can be applied in detecting chromium in polluted soil from Yun-Nan Province in Southwest China. We use density functional theory to calculate the change of the Gibbs free energy (Delta G) of the interactions between the DMSA-Au NP system and various metal ions, which shows that DMSA-Au NPs have high specificity for both Cr3+ and Cr2O72-.
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