Polyethylenimine-stabilized silver nanoclusters act as an oxidoreductase mimic for colorimetric determination of chromiu
- PDF / 588,890 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 102 Downloads / 199 Views
ORIGINAL PAPER
Polyethylenimine-stabilized silver nanoclusters act as an oxidoreductase mimic for colorimetric determination of chromium(VI) Qiangsheng Xue 1 & Xin Li 2 & Yinxian Peng 1,3 & Peng Liu 2 & Hongbing Peng 1 & Xiangheng Niu 2 Received: 3 December 2019 / Accepted: 23 March 2020 # Springer-Verlag GmbH Austria, part of Springer Nature 2020
Abstract A new and efficient assay is proposed for the photometric determination of Cr6+ by employing polyethylenimine-stabilized Ag nanoclusters (PEI-AgNCs) as an oxidoreductase mimic. Cr6+ with certain oxidicability is able to specifically react with 3,3′,5,5′tetramethylbenzidine (TMB), giving a color change from colorless to blue indicating the presence of Cr6+. However, the redox kinetics is so slow that the sensitivity obtained for Cr6+ determination is very poor. It is interestingly found that PEI-AgNCs can act as an oxidoreductase-like nanozyme to significantly promote the sluggish reaction, making it possible to rapidly detect toxic Cr6+ with remarkably enhanced performance. With the use of PEI-AgNCs, fast and convenient determination of Cr6+ was realized, with a limit of detection as low as 1.1 μM. Additionally, the proposed assay exhibited excellent selectivity; other ions, including Cr3+, hardly affected the determination of Cr6+. Keywords Silver nanocluster . PEI . Nanozyme . Oxidoreductase . Colorimetric determination . Chromium . Enzyme mimic . Catalysis
Introduction Chromium (Cr) is one of the most widely distributed heavy metals and commonly exists as Cr3+ and Cr6+. In comparison with Cr3+, Cr6+ is much more poisonous towards the environment and human health [1]. It has high solubility in aqueous solution and can be easily accumulated in the human body, Qiangsheng Xue and Xin Li contributed equally to this work. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00604-020-04232-8) contains supplementary material, which is available to authorized users. * Yinxian Peng [email protected] * Xiangheng Niu [email protected] 1
School of Metallurgical and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China
2
Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China
3
School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
causing a lot of diseases [2]. As a result, it is always in high demand to monitor Cr6+ in environmental and food matrices [3]. Nowadays, atomic absorption spectrometry and atomic emission spectrometry have been well developed for Cr6+ determination [4, 5]. Although these traditional techniques can provide good analytical performance for Cr6+, relatively expensive instruments and professional operation are required, making them not suitable to determine the analyte rapidly, conveniently and on-site. With this consideration, scientists have been trying to explore new approaches for the effective, low-c
Data Loading...
