Optical mesosensor for capturing of Fe(III) and Hg(II) ions from water and physiological fluids

El‐Safty, Sherif A.; Shenashen, Mohamed A.

doi:10.1016/j.snb.2013.03.041

Cited by 61 publications

(38 citation statements)

References 123 publications

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“…[39][40][41][42][43][44][45][46][47] However, the following key components that can help provide prospectively optical nanosensor/captor/filter for a controlled environmental cleanup system remain to be addressed: 1) Controlling multi-functional processes in complete water purification systems such as sensing/removal and separation in a one step-screening procedure;…”

Section: Introductionmentioning

confidence: 99%

Mesosponge Optical Sinks for Multifunctional Mercury Ion Assessment and Recovery from Water Sources

El‐Safty

Sakai

Selim

et al. 2015

ACS Appl. Mater. Interfaces

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Using the newly developed organic-inorganic colorant membrane is an attractive approach for the optical detection, selective screening and removal, and waste management recovery of highly toxic elements, such as Hg(II) ions, from water sources. In the systematic mesosponge optical sinks (MOSs), anchoring organic colorants into 3D, well-defined cage cavities and interconnected tubular pores (10 nm) in the long microscale channels of membrane scaffolds enhances the requirements and intrinsic properties of the hierarchal membrane. This scalable design is the first to allow control of the multifunctional processes of a membrane in a one-step screening procedure, such as the detection/recognition, removal, and filtration of ultratrace Hg(II) ions, even from actual water sources (i.e., tap, underground). The selective recovery, detection, and extraction processes of Hg(II) ions in a heterogeneous mixture with inorganic cations and anions as well as organic molecules and surfactants are mainly dependent on the structure of the colorant agent, the pH conditions, competitive ion-system compositions and concentrations, and Hg-to-colorant binding events. Our result shows that the solid MOS membrane arrays can be repeatedly recycled and retain their hierarchal mesosponge sink character, avoiding fouling via the precipitation of metal salts as a result of the reuse cycle. The Hg(II) ion rejection and the permeation of nonselective elements based on the membrane filtration protocol may be key considerations in water purification and separation requirements. The selective recovery process of Hg(II) ions in actual contaminated samples collected from tap and underground water sources in Saudi Arabia indicates the practical feasibility of our designed MOS membrane arrays.

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Section: Introductionmentioning

confidence: 99%

Mesosponge Optical Sinks for Multifunctional Mercury Ion Assessment and Recovery from Water Sources

El‐Safty

Sakai

Selim

et al. 2015

ACS Appl. Mater. Interfaces

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“…7b displays a regular morphology and a narrow particle size distribution. The morphology of the dried monolithic materials was studied by SEM which indicated that the materials were composed of a highly interconnected network of sol-gel particles [30]. Such morphology is correlated with the porosity measurements which indicate that sol-gel prepared in N-imp is mesoporous, while Hg-imp is almost microporous.…”

Section: N 2 Adsorption/desorption Experimentsmentioning

confidence: 78%

Development and characterization of ion-imprinted sol–gel-derived fluorescent film for selective recognition of mercury(II) ion

Karagöz

Güney

2015

J Sol-Gel Sci Technol

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In this work, an ion-imprinted fluorescent sensor by combining sol-gel processing and spin coating was developed. Fluorescent functional silane was first synthesized and reacted with tetramethoxysilane to obtain solgel-derived materials and then used as a receptor for selective removal and sensing of Hg 2? in aqueous solution. Ion-imprinted material synthesized in the presence of Hg 2? was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, N 2 adsorptiondesorption analysis and thermogravimetric analysis by comparing with non-imprinted material obtained in the absence of Hg 2? . Surface area, pore volume and diameter were analyzed from the profile of nitrogen adsorption. It was observed that fluorescent sol-gel film exhibits distinctive change in fluorescence emission upon interaction with Hg 2? . Steady-state fluorescence experiments were performed for spectral characterization of the films, and the advancement of the reaction was defined. The shift in emission maxima and other spectral changes of the different matrices have been identified, and gelation time of sol-gel network was revealed by monitoring the emission of fluorescent silane in pre-gel solution. The corresponding selectivity factors of the imprinted fluorescent film toward Hg 2? against the other analogs were evaluated. Graphical AbstractKeywords Optical sensor Á Sol-gel thin film Á Mercury ion-imprinting Á Fluorescence sensing

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“…These aluminosilica materials demonstrate exciting sensing applications despite their disorderly structures . The monofunctionalization of the inner surface or successive inclusion of different organic moieties can be achieved by co-condensation or post-synthetic covalent grafting of organic compounds that yield high-order hybrid materials [86][87][88][89][90][91][92]. The metal ions can then interact with organic moieties by non-covalent bonding, such as hydrogen bonding, metal coordination, hydrophobic forces, van der Waals forces, π-π interactions, and electrostatic and/or electromagnetic effects.…”

Section: 2mentioning

confidence: 99%

“…In such design techniques, the strong binding site-Cd 2+ interaction enabled the remarkably selective removal of toxic Cd 2+ ions from water, wastewater and physiological fluids (blood) without any toxicological effects on the red blood cells (RBCs). Such nano-engineered hybrid materials possess the advantages of optical transparency (in the visible to UV range), high dye dispersion, mechanical robustness, and high processability [82][83][84][85][86][87][88][89][90][91][92][93][94][95][96][97]. These mesoporous sensor/captor responses can be triggered by a target Cd 2+ -ion species and transduce 8 measurable optical signals under synergistic pH, reaction temperature, and contact-time "response time" conditions, enabling the binding of the Cd 2+ ions into a hydrophobic or hydrophilic ligand pocket to be mimicked.…”

Section: 2mentioning

confidence: 99%

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Environmental remediation and monitoring of cadmium

Khairy

El‐Safty

Shenashen

2014

TrAC Trends in Analytical Chemistry

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Optical mesosensor for capturing of Fe(III) and Hg(II) ions from water and physiological fluids

Cited by 61 publications

References 123 publications

Mesosponge Optical Sinks for Multifunctional Mercury Ion Assessment and Recovery from Water Sources

Mesosponge Optical Sinks for Multifunctional Mercury Ion Assessment and Recovery from Water Sources

Development and characterization of ion-imprinted sol–gel-derived fluorescent film for selective recognition of mercury(II) ion

Environmental remediation and monitoring of cadmium

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