期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 395, 期 -, 页码 161-167出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2011.12.024
关键词
Gold nanoparticles; Hg2+; Cysteine; Anti-aggregation; Calorimetric sensors
资金
- Major National Scientific Research Plan of China (973 Program) [2011CB933202]
- CAS [Y12901FEA2]
- National Natural Science Foundation of China [20877099, 20972183]
- National Sci-Tech Major Special Item for Water Pollution Control and Management [2009ZX07527-007-03]
- National Science & Technology Pillar Program [2009BAK61B01]
- State Key Laboratory of Natural and Biomimetic Drugs [20080208]
- State Key Laboratory of Environmental Chemistry and Ecotoxicology [KF2010-23]
- State Key Laboratory of Electroanalytical Chemistry [SKLEAC2010005]
A new method has been proposed to realize the visual detection of Hg2+ via anti-aggregation of gold nanoparticles (Au NPs). The positively charged Au NPs were prepared using poly(diallyldimethylammonium) chloride (PDDA) as reducer and stabilizer. In the presence of cysteine, the color of Au NPs solution turned from ruby red to royal purple, indicating the aggregation of Au NPs. Owing to the high stability constant of cysteine with Hg2+, the pre-incubation of Hg2+ with cysteine would form Hg2+-cysteine complexes and significantly reduce the concentration of free cysteine molecules, thus the aggregation of Au NPs was interrupted since there was not enough inducer. With the increase of Hg2+ concentration, the color of the Au NPs solution would progress from purple to red, allowing the visual detection of Hg2+ ranging from 5.0 x 10(-8) to 1.0 x 10(-5) M, with a detection limit of 2.5 x 10(-8) M. The proposed method is convenient, low-cost and free of complex equipment, making it possible to analyze Hg2+ in drinking water, rain water or water extracted air samples. (C) 2011 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据