Citrate-Coated Gold Nanoparticles As Smart Scavengers for Mercury(II) Removal from Polluted Waters

Ojea-Jiménez, Isaac; López, Xicoténcatl; Arbiol, Jordi; Puntes, Víctor

doi:10.1021/nn204313a

Cited by 188 publications

(140 citation statements)

References 41 publications

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“…Consequently, the system became so destabilized and thereby resulted in the aggregation of Au NPs and a color change from red to blue, which is different from the reported aggregation induced by the deposition of Hg 2+ onto the Au NP surface. 29 As shown in Figure 1A, a characteristic surface plasmon resonance (SPR) band of the prepared Au NPs was observed in the spectrum at approximately 520 nm (curve a, Figure 1A). With the addition of CuDDTC 2 complex, the spectrum (curve b, Figure 1A) was pretty much the same as that of pure Au NPs (curve a, Figure 1A).…”

Section: Scheme 1 Schematic Illustrations Of (A) Au Np-based Colorimmentioning

confidence: 92%

Colorimetric Detection of Mercury Species Based on Functionalized Gold Nanoparticles

Chen

2014

ACS Appl. Mater. Interfaces

219

109

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The speciation analysis of heavy metal pollutants is very important because different species induce different toxicological effects. Nanomaterial-assisted optical sensors have achieved rapid developments, displaying wide applications to heavy metal ions but few to metal speciation analysis. In this work, a novel colorimetric nanosensor strategy for mercury speciation was proposed for the first time, based on the analyte-induced aggregation of gold nanoparticles (Au NPs) with the assistance of a thiol-containing ligand of diethyldithiocarbamate (DDTC). Upon the addition of mercury species, because Hg-DDTC was more stable than Cu-DDTC, a placedisplacement between Hg species and Cu 2+ would occur, and thereby the functionalized Au NPs would aggregate, resulting in a color change. Moreover, by virtue of the masking effect of ethylenediaminetetraacetic acid (EDTA), the nanosensor could readily discriminate organic mercury and inorganic mercury (Hg 2+ ), and it is thus anticipated to shed some light on the colorimetric sensing of organic mercury. So, a direct, simple colorimetric assay for selective determination of Hg species was obtained, presenting high detectability, such as up to 10 nM for Hg 2+ and 15 nM for methylmercury. Meanwhile, the strategy offered excellent selectivity toward mercury species against other metal ions. The simple, rapid, and sensitive label-free colorimetric sensor for the determination of Hg species provided an attractive alternative to conventional methods, which usually involve sophisticated instruments, complicated processes, and long periods of time. More importantly, by using mercury as a model, an excellent nanomaterial-based optical sensing platform can be developed for speciation analysis of trace heavy metals, which can lead to nanomaterials stability change through smart functionalization and reasonable interactions.

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Section: Scheme 1 Schematic Illustrations Of (A) Au Np-based Colorimmentioning

confidence: 92%

Colorimetric Detection of Mercury Species Based on Functionalized Gold Nanoparticles

Chen

2014

ACS Appl. Mater. Interfaces

219

109

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“…5A, compared 2+ , could not affected the detection of 1.0 M Cr (VI). In addition, as we know, Hg 2+ could be reduced to Hg (0) and formed Hg-Au alloys [31,32], which may disturb the surface of Au NPs. However, in this sensing method, 100 M of Hg 2+ could not interfere with the detection process.…”

Section: Sensitivity and Selectivity Of The Sensormentioning

confidence: 99%

Red-to-blue colorimetric detection of chromium via Cr (III)-citrate chelating based on Tween 20-stabilized gold nanoparticles

Wang

Wei

Wang

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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h i g h l i g h t s• A simple sensitive colorimetric sensing platform for Cr (III) and Cr (VI) detection.• The strategy relied on Cr (III)-citrate chelation inducing aggregation of Au NPs.• Cr (VI) ion was reduced to Cr (III) by ascorbic acid.• The strategy provided potential for heavy metal speciation analysis. In this work, a simple "red-to-blue" colorimetric method for highly sensitive and selective determination of Cr (III) and Cr (VI) was presented, which was based on the aggregation of Tween 20-stabilized gold nanoparticles (Tween 20-Au NPs). This strategy relied upon the distance-dependent optical properties of gold nanoparticles (Au NPs), strong chelating between Cr (III) and citrate, and the reduction of Cr (VI) to Cr (III) by ascorbic acid (AA). Cr (III) could chelate with citrate to form a stable Cr (III)-citrate complex and thereby induce the aggregation of Tween 20-Au NPs. Thus, the sensing of Cr (III) and Cr (VI) based on aggregation of Au NPs was developed with the color of the Au NPs changing from red to blue, which was readily seen by the naked eye. The color change and surface plasmon resonance (SPR) absorption were used to monitor Cr (III) and Cr (VI) levels. Under the optimal assay conditions, good linear relationship was obtained, and the detection limit of Cr (III) and Cr (VI) were 0.016 M and 0.009 M in standard aqueous solution, respectively. Furthermore, the colorimetric method exhibited a good selectivity over other metal ions and was successfully applied to detect Cr (III) and Cr (VI) in real water samples.

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“…The scenario of intended exposure (e.g. fertilizers [2][3][4], antimicrobial agents [5][6][7], removal of contaminants [8][9][10] and clinical use [11][12][13][14][15]), as well as unintended exposure (e.g. contamination [16] and general uptake by all types of organisms [17][18][19][20]) has been analysed in a large body of work.…”

Section: Introductionmentioning

confidence: 99%

Interaction of colloidal nanoparticles with their local environment: the (ionic) nanoenvironment around nanoparticles is different from bulk and determines the physico-chemical properties of the nanoparticles

Pfeiffer

Rehbock

Hühn

et al. 2014

J. R. Soc. Interface.

321

301

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The physico-chemical properties of colloidal nanoparticles (NPs) are influenced by their local environment, as, in turn, the local environment influences the physico-chemical properties of the NPs. In other words, the local environment around NPs has a profound impact on the NPs, and it is different from bulk due to interaction with the NP surface. So far, this important effect has not been addressed in a comprehensive way in the literature. The vicinity of NPs can be sensitively influenced by local ions and ligands, with effects already occurring at extremely low concentrations. NPs in the Hü ckel regime are more sensitive to fluctuations in the ionic environment, because of a larger Debye length. The local ion concentration hereby affects the colloidal stability of the NPs, as it is different from bulk owing to Debye Hü ckel screening caused by the charge of the NPs. This can have subtle effects, now caused by the environment to the performance of the NP, such as for example a buffering effect caused by surface reaction on ultrapure ligandfree nanogold, a size quenching effect in the presence of specific ions and a significant impact on fluorophore-labelled NPs acting as ion sensors. Thus, the aim of this review is to clarify and give an unifying view of the complex interplay between the NP's surface with their nanoenvironment.

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Citrate-Coated Gold Nanoparticles As Smart Scavengers for Mercury(II) Removal from Polluted Waters

Cited by 188 publications

References 41 publications

Colorimetric Detection of Mercury Species Based on Functionalized Gold Nanoparticles

Colorimetric Detection of Mercury Species Based on Functionalized Gold Nanoparticles

Red-to-blue colorimetric detection of chromium via Cr (III)-citrate chelating based on Tween 20-stabilized gold nanoparticles

Interaction of colloidal nanoparticles with their local environment: the (ionic) nanoenvironment around nanoparticles is different from bulk and determines the physico-chemical properties of the nanoparticles

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