Colorimetric detection of mercury ions using MnO<sub>2</sub> nanorods as enzyme mimics

Yang, Haiguan; Xiong, Yuhao; Zhang, Peng; Su, Linjing; Ye, Fanggui

doi:10.1039/c5ay00633c

Cited by 55 publications

(16 citation statements)

References 35 publications

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“…In the presence of Hg 2+ ions, AuNPs demonstrate strong peroxidase-mimicking behaviour for the oxidation of 3,3',5,5'-tetramethybenzidine (TMB) substrate, due to Au-Hg amalgamation [27][28][29][30]. These important findings have resulted in the development of fluorescence [31] colorimetric [32] and paper-based sensors [33] and the exploitation of catalytically-active nanomaterials including DNA-Ag/Pt nanoclusters [34] and manganese dioxide (MnO2) nanorods [35] for the detection of Hg 2+ ions.…”

Section: Introductionmentioning

confidence: 99%

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

et al. 2020

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Mercury (Hg) is extremely toxic, and continues to cause major threats to aquatic life, human health and the environment. Hg 2+ mainly derives from seawater as a product of atmospheric deposition, therefore there is great demand for sensing approaches that can detect Hg 2+ in seawater samples. Herein, we demonstrate that the peroxidase-mimicking activity of gold nanoparticles (AuNPs) or so-called nanozymes, can be exploited for the detection of Hg 2+ ions in various water samples. In a high electrolyte environment, the catalytic activity for the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) was significantly diminished due to poor stability of the bare-AuNPs. This activity was reduced by ~ 73.7% when the NaCl concentration was higher than 1.168%, which is much lower than that of seawater (~ 3.5%), thus presenting its unsuitability for detecting Hg 2+ in harsh water matrices. To overcome this limitation, AuNPs were first functionalized with oligo-ethylene glycol (OEG), of which their colloidal form presented high stability in NaCl concentrations up to 20% and across a wide range of pHs from 1-14. Interestingly, the catalytic activity of OEG-AuNPs for the oxidation of TMB was strongly suppressed by the coating, but enhanced upon formation of Au-Hg amalgamation. This novel finding underlies a straightforward, sensitive, and highly selective detection platform for Hg 2+ in water samples. The approach could detect the exposure limit level for Hg 2+ in drinking water (i.e., 2 ppb for tap and bottled water) as set by the United States Environmental Protection Agency (EPA) and the World Health Organization (WHO). When Hg 2+ was spiked into a 3.5% saline solution and a coastal seawater certified reference material (CRM), the detection limits were found to be 10 and 13 ppb, respectively, which exceed the Hg 2+ concentrations commonly found within seawater (~ 60-80 ppb). The whole procedure takes less than 45 min to conduct, providing a highly innovative, rapid and low-cost approach for detecting Hg 2+ in complex water matrices.

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Section: Introductionmentioning

confidence: 99%

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

et al. 2020

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“…[29][30][31][32] Several probes for Hg 2 + have been developed based on MnO 2 nanomaterials. [33][34][35] Yang et al and Wu et al have designed two fluorescent probes for Hg 2 + using MnO 2 nanosheets as the fluorescence quencher. [33,34] Fluorophore-labeled oligonucleotide can adsorb on MnO 2 nanosheets via vander Waals force, which leads to fluorescence quenching.…”

Section: Introductionmentioning

confidence: 99%

A Simple Colorimetric Probe for Sensitive Detection of Hg²⁺ Based on MnO₂ Nanosheets and Monothioglycerol

Ding

Zhao

et al. 2020

ChemistrySelect

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It is of great significance to develop efficient platforms for the detection of hypertoxic Hg 2 +. Colorimetric probes have received much attention for the detection of Hg 2 + in the last decades. In this work, a colorimetric probe composed of MnO 2 nanosheets and monothioglycerol (MTG) was rationally designed for Hg 2 + detection, which was facially prepared via onestep reaction at room temperature. The formation of HgÀ S bond between Hg 2 + and MTG inhibited the decomposition ability of MTG toward MnO 2 nanosheets, thus resulting in a color change from colorless to brown. On this basis, the probe quantified Hg 2 + in the concentration range from 2 to 60 μM with a low detection limit of 0.75 μM. The probe was applied to the detection of Hg 2 + in tap water successfully, and was further fabricated into test strips for the convenience of use. Thereby, a simple and sensitive colorimetric probe for Hg 2 + is developed in this work, which holds future promise for monitoring Hg 2 + in the environment.

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“…[27][28][29] Currently new nanocomposites were fabricated to exhibit catalytic activity which is comparable to the activity of some natural enzymes such as catalyzes, oxidase, peroxidase, etc. [30] These enzyme mimics nanocomposite has special features such as, low cost, high catalytic activity, stability, [31] convenience in preparation, storage and separation. [32] Due to these properties these materials are act as a colorimetric sensor for the detection of heavy metals in aqueous solution.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Peroxidase Mimetic Activity of Magnetic Porous Carbon (MPC) Utilized in Colorimetric Sensing of Hg (II) Ions in Aqueous Medium

Christus

Panneerselvam

2020

ChemistrySelect

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A new sensitive colorimetric sensor was designed to investigate the presence of Hg2+ in aqueous solution by using Fe3O4 NP impregnated on carbon nanocomposite(MPC) synthesized from MIL88 A which possess an excellent peroxidase mimicking activity that brings oxidation of 3, 3’, 5, 5’‐ tetramethylbenzidine (TMB) under the influence of hydrogen peroxide (H2O2) to produce blue colour in the solution. The solution was decolorized by the addition of Glutathione (GSH) which restores the TMB radical cations and ceased the oxidation reaction. Addition ofHg2+ ions to the solution bring back a strong blue colour due to the strong affinity of Hg 2+ with the thiol groups of GSH which promote the oxidation of TMB in the solution. Based on these strategies, we have developed a sensitive andselective colorimetric sensor for the determination of Hg (II) in aqueous solution with the detection limit value of 236 pM and a linear relationship of R2=0.994. The proposed mechanism was successfully implemented for the detection of mercury in real water samples for environmental applications.

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Colorimetric detection of mercury ions using MnO₂ nanorods as enzyme mimics

Abstract: In this study, a simple and novel “off–on” colorimetric sensor for the detection of mercury ions (Hg2+) in aqueous solution was developed.

Cited by 55 publications

References 35 publications

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

A Simple Colorimetric Probe for Sensitive Detection of Hg²⁺ Based on MnO₂ Nanosheets and Monothioglycerol

Enhanced Peroxidase Mimetic Activity of Magnetic Porous Carbon (MPC) Utilized in Colorimetric Sensing of Hg (II) Ions in Aqueous Medium

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Colorimetric detection of mercury ions using MnO2 nanorods as enzyme mimics

Abstract: In this study, a simple and novel “off–on” colorimetric sensor for the detection of mercury ions (Hg2+) in aqueous solution was developed.

Cited by 55 publications

References 35 publications

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

Amalgamated gold-nanoalloys with enhanced catalytic activity for the detection of mercury ions (Hg2+) in seawater samples

A Simple Colorimetric Probe for Sensitive Detection of Hg2+ Based on MnO2 Nanosheets and Monothioglycerol

Enhanced Peroxidase Mimetic Activity of Magnetic Porous Carbon (MPC) Utilized in Colorimetric Sensing of Hg (II) Ions in Aqueous Medium

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Product

Resources

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Colorimetric detection of mercury ions using MnO₂ nanorods as enzyme mimics

A Simple Colorimetric Probe for Sensitive Detection of Hg²⁺ Based on MnO₂ Nanosheets and Monothioglycerol