Recyclable fluorescent gold nanocluster membrane for visual sensing of copper(ii) ion in aqueous solution

Abstract

Recently, metal-selective fluorescent chemosensors have attracted intense attention for their simple and real-time tracking of metal ions in environmental samples. However, most of the existing fluorescent sensors are one-off sensors and thus suffer from large amount of reagent consumption, significant experimental cost and raising the risk of environmental pollution. In this paper, we developed a green (low reagent consumption, low-toxicity reagent use), recyclable, and visual sensor for Cu(2+) in aqueous solution by using a fluorescent gold nanoclusters membrane (FGM) as the sensing unit, basing on our findings on gold nanoclusters (Au NCs) that the bovine serum albumin (BSA)-coated Au NCs exhibit excellent membrane-forming ability under the isoelectric point of BSA, and thus enable us to obtain a new type of sensing membrane (i.e. FGM) by denaturing Au NCs; the fluorescence of FGM can be significantly quenched by Cu(2+) ion, and the quenched fluorescence can be totally recovered by histidine; the as-prepared FGM is very stable and recyclable, which makes it an ideal sensing material.

Fluorescent Ag Nanoprobes for the Highly Selective Detection of Mercury (II) Ions and Colorimetric Detection of Hydrogen Peroxide

“…[25][26][27] So the effect of the metal ions (50 M): Ag + , Pb 2+ , Ca 2+ , Hg 2+ , Al 3+ , Mg 2+ , Zn 2+ , Na + , K + , Cd 2+ , Fe 3+ , Ni 2+ and Mn 2+ on the changes in fluorescence of the as-prepared Ag NCs was investigated. I 0 and I in the Figure 2 to the fluorescence intensity of Ag NCs in the absence and in the presence of metal ions.…”

Copper nanoclusters coated with bovine serum albumin as a regenerable fluorescent probe for copper(II) ion

“…However, short-or long term exposure to high levels of Cu 2+ ions can lead to gastrointestinal disturbances or damage to the liver and kidneys, respectively [1,2]. The allowed concentration of Cu 2+ in drinking water is less than 2 mg/L (32 μM), according to guidelines for drinking water quality of the World Health Organization [3]. Thus, the development of sensitive, selective and flexible methods for the detecting of Cu 2+ ions is highly demanded and of great significance [4][5][6][7][8][9][10][11].…”

Cu2+Selective Chromogenic Behavior of Calix[4]arene Derivative

“…Moreover, it is a great menace and has a lethal effect not only for human beings but at lower concentration some microorganisms also are at high risks (16). Hence, US Environmental Protection Agency (EPA) and World Health Organization (WHO) recommended that the allowed concentration of Cu 2+ in drinking water is less than 2 or 1.3 mg/L (20 μM) (17,18).…”