Modified mesoporous silica nanoparticles as a reusable, selective chromogenic sensor for mercury(ii) recognition

Sánchez, Guzmán; Curiel, David; Ratera, Imma; Tárraga, Alberto; Veciana, Jaume; Molina, Pedro

doi:10.1039/c2dt32243a

Cited by 33 publications

(14 citation statements)

References 55 publications

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“…In addition, the weight loss above 100 °C, in this case, shows a large peak arising due to the decomposition of the organic fragment of bis‐silane (Figure S13). Since mass loss is much larger than that of bare silica nanoparticles, this not only evidences the covalent anchoring of silane at the surface, but also provides a method to estimate the amount of grafting via comparison method and the value turns out to be 0.324 mmol g −1 . On further heating, i.e.…”

Section: Resultsmentioning

confidence: 99%

“…Since mass loss is much larger than that of bare silica nanoparticles, this not only evidences the covalent anchoring of silane at the surface, but also provides a method to estimate the amount of grafting via comparison method and the value turns out to be 0.324 mmol g −1 . [29] On further heating, i.e. above 600°C, the condensation and cross-linking of silanol groups commences to form stable inorganic silica at the end of the analysis.…”

Section: Characterization Of Nanocompositementioning

confidence: 99%

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An expedient ‘click’ approach for the synthetic evaluation of ester‐triazole‐tethered organosilica conjugates

Singh

Rani

2017

Applied Organom Chemis

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The present work articulates the synthesis of a new series of organo‐functionalized triethoxysilanes derived from versatile carboxylic acids and 3‐azidopropyltriethoxysilane in excellent yields. A proficient and convenient route implicating the Cu(I)‐catalysed 1,3‐cycloaddition of organic azide with terminal alkynes, labelled as click silylation, has been developed for the generation of ester‐triazole‐linked alkoxysilanyl scaffolds (4a–f). All the synthesized compounds have been thoroughly characterized using elemental analysis and Fourier transform infrared, 1H NMR and 13C NMR spectroscopic techniques. Importantly, the fabricated alkoxysilanes are potentially amenable for an in situ sol–gel condensation reaction with silica nanospheres leading to the incorporation of organic functionality via covalent grafting onto the nanostructured particle system. As a proof of concept, a one‐pot preparation of organic–inorganic hybrid nanoparticles is presented using bis‐silane 4 f. The efficiency and selectivity of the prepared nanocomposite towards metal ions is highlighted using adsorption experiments, and the immobilized nanoparticles present a high sensing efficiency towards Cu2+ and Pb2+ ions while demonstrating better response than that of the bulk material.

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Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Nanocompositementioning

confidence: 99%

An expedient ‘click’ approach for the synthetic evaluation of ester‐triazole‐tethered organosilica conjugates

Singh

Rani

2017

Applied Organom Chemis

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“…From amongst several families of mesoporous silica materials (MPS) already developed and used in sensor applications, it is worth mentioning the more typical MCM [19,32,33,36,39,42,[58][59][60][61][62][63][64][65], SBA [21-28, 34, 35, 45, 48, 58, 60, 66], HOM [20,36,[43][44][45][46]67], HMS [29,38]. Lamellar MCM-50 [107,108] The structures of the more studied mesoporous materials for sensor applications are presented in Figure 1.…”

Section: Mesoporous Materialsmentioning

confidence: 99%

“…In regard to Hg 2+ sensing material, SBA-15 is mostly used [21][22][23][24][25][26][27][28]. Other mesoporous materials such as UVM-7 [19], HOM-9 [20], Au-HMS [28] core-shell MPS nanoparticles [30,31], and MCM-41 [32,33] have also been studied. The more often used is covalent bonding of the indicator dye to the mesoporous material but immobilisation via H-bonds [23] or ionic bonds [20] is also possible.…”

Section: Mercurymentioning

confidence: 99%

“…When designing an OCS with the desired sensor characteristics, it is not only the selection of a suitable indicator, solid support (matrix), and immobilisation technique that is important but also the morphology and suitable functionalisation of 2 Journal of Nanomaterials such materials [18]. Over the years, different optical chemical sensors have been introduced based on silica mesoporous materials for the determination of mercury [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], copper [35][36][37][38], zinc [39][40][41][42], and other heavy metal ions [43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

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Sensing Heavy Metals Using Mesoporous‐Based Optical Chemical Sensors

Urek

Frančič

Turel

et al. 2013

Journal of Nanomaterials

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Heavy metal pollution is one of the more serious environmental problems; therefore, there is a constant demand for the development of new analytical tools for its monitoring. An optical chemical sensor represents a good alternative to classical instrumental methods. The mesoporous materials used in optical chemical sensors' fabrications have properties such as high porosity, exceptional adsorption capacity, tuneable 3D shape, geometry, and morphology, which enable improved limit of detection, response time, and selectivity properties of optical sensors. In this review, we firstly present the properties of mesoporous materials, provide a brief description of sensing mechanisms, and briefly discuss the importance of continuous monitoring. Recent advances in those mesoporous silica-based optical sensors used for heavy metal detection have been reported and their advantages and limitations also discussed. This review covers publications that have appeared since 2008.

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Chemosensing hybrid materials: Chalcones‐functionalized cage‐like mesoporous SBA‐16 material for highly selective detection of toxic metal ions

El‐Nahass

Fayed

2017

Applied Organom Chemis

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Highly selective and low‐cost optical nanosensors of organic–inorganic hybrid materials for heavy metal ions detection have been prepared via the functionalization of mesoporous silica (SBA‐16) with chalcone fluorescent chromophores. The successful attachment of organic chalcone moieties and preservation of original structure of SBA‐16 after the anchoring process were confirmed by extensive characterizations using various techniques like Fourier transform infrared and UV–visible spectroscopies, transmission electron microscopy, nitrogen adsorption–desorption isotherms, low‐angle X‐ray diffraction and thermogravimetric analysis. The colorimetric behaviour, selectivity and sensitivity were also investigated. The optical nanosensors respond selectively to heavy metal ions, such as Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Cd2+ and Hg2+, with observable colour changes in 0.01 M Tris–HCl aqueous buffer solution. Also, the optical sensing ability of the investigated nanosensors to the mentioned metal ions was investigated using steady‐state absorption and emission techniques. Significant increase in the absorption spectra and a static quenching in the emission spectra are observed upon adding various concentrations of the studied metal ions. The spectral changes as well as the observable colour changes suggest that the investigated nanosensors are suitable for simple, economic, online analysis and remote design of these toxic metal ions with fast kinetic responses. Finally, the low detection limits for all the studied metals are in good agreement with those recommended by both the US Environmental Protection Agency and World Health Organization, except for Hg2+ and Cd2+, indicating that the investigated nanosensors have hypersensitivity, selectivity and better recognition for all the studied metal ions.

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Modified mesoporous silica nanoparticles as a reusable, selective chromogenic sensor for mercury(ii) recognition

Abstract: A new tripodal receptor and a novel dyed mesoporous material are presented. The presence of thioureas conjugated with azobenzene chromophores enables the selective colorimetric detection of mercury(II) cations in THF through a remarkable colour change from yellow to deep purple.

Cited by 33 publications

References 55 publications

An expedient ‘click’ approach for the synthetic evaluation of ester‐triazole‐tethered organosilica conjugates

An expedient ‘click’ approach for the synthetic evaluation of ester‐triazole‐tethered organosilica conjugates

Sensing Heavy Metals Using Mesoporous‐Based Optical Chemical Sensors

Chemosensing hybrid materials: Chalcones‐functionalized cage‐like mesoporous SBA‐16 material for highly selective detection of toxic metal ions

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