Colorimetric detection of heavy metal ions using aminosilane

Jeong, Uiseok; Kim, Younghun

doi:10.1016/j.jiec.2015.07.014

Cited by 27 publications

(6 citation statements)

References 26 publications

(39 reference statements)

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“…During the past few years, several chemosensors have evolved for the selective qualitative analysis of different metal ions based on metal-ligand coordination as the host-guest interaction principle [7,24]. Our aim in this research work was to develop ligand bearing coordination sites that had a binding ability and selectivity toward specific transition metal ions in aqueous systems.…”

Section: Resultsmentioning

confidence: 99%

“…This compound is considered a bidentate ligand capable of coordinating to the metal ions through the nitrogen atom of the azomethine group and the soft sulfur atom of the thiol group [25]. It is reported that compounds containing amine, mercapto, hydroxyl, or carboxyl groups adjacent to the azomethine group have high affinity and coordination capability to the heavy metal ions [24]. This selected Schiff base ligand, as a chromogenic system that has binding and signaling components, acts as a signal transduction bond with the analyte (metal ion), forms a metal complex, and generates electronic modulation, causing a color change that can be detected easily by the naked eye [26].…”

Section: Resultsmentioning

confidence: 99%

“…The SL 1 solution did not show any significant color change upon the addition of the other metal solutions of Cu 2+ , Co 2+ , Ni 2+ , Zn 2+ , Mg 2+ , Mn 2+ , V 5+ , and Pb 2+ . This could be explained by the Gibb's free energy of the reaction for the formation of the metal-ligand (SL 1 ) complex for these metals might not be sufficient for the randomness of the reaction and, therefore, has no influence on the formation of the metal-SL 1 -ligand complex and no colors were seen [24]. Therefore, SL 1 was only able to sense Fe 2+ , Fe 3+ , Cr 3+ , and Hg +2 ions in aqueous solutions by giving a different color for each metal ion.…”

Section: Transition Metal Ions Sensing With Colorimetry Analysismentioning

confidence: 99%

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Colorimetric Detection of Multiple Metal Ions Using Schiff Base 1-(2-Thiophenylimino)-4-(N-dimethyl)benzene

2019

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In this paper, a Schiff base ligand 1-(2-thiophenylimino)-4-(N-dimethyl)benzene (SL1) bearing azomethine (>C=N-) and thiol (-SH) moieties capable of coordinating to metals and forming colored metal complexes was synthesized and examined as a colorimetric chemosensor. The sensing ability toward the metal ions of Cu2+, Cr3+, Fe2+ Ni2+, Co2+, Mg2+, Zn2+, Fe2+, Fe3+, NH4VO3 (V5+), Mn2+, Hg2+, Pb2+, and Al3+ was investigated in a mixture of H2O and dimethylformamide (DMF) solvent using the UV–Visible spectra monitoring method. The synthesized Schiff base ligand showed colorimetric properties with Cr3+, Fe2+, Fe3+, and Hg2+ ions, resulting in a different color change for each metal that could be identified easily with the naked eye. The UV–Vis spectra indicated a significant red shift (~69–288 nm) from the origin after the addition of the ligand to these metal ions, which may be due to ligand-to-metal charge-transfer (LMCT). On applying Job’s plot, it was indicated that the ligand binds to the metal ions in a 2:1 ligand-to-metal molar ratio. SL1 behaves as a bidentate ligand and binds through the N atom of the imine group and the S atom of the thiol group. The results indicate that the SL1 ligand is an appropriate coordination entity and can be developed for use as a chemosensor for the detection of Cr3+, Fe2+, Fe3+, and Hg2+ ions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Transition Metal Ions Sensing With Colorimetry Analysismentioning

confidence: 99%

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Colorimetric Detection of Multiple Metal Ions Using Schiff Base 1-(2-Thiophenylimino)-4-(N-dimethyl)benzene

2019

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“…The amino groups also play an important role as active sites on the silica matrix to bind other molecules or species, creating new interactions and functional points on the surface. This capacity can be explored in fields like environmental remediation, catalysis and sensors [61][62][63]. For these reasons, there is great interest in the development of new applications of amino-modified silica matrices.…”

Section: Silica-based Aerogelsmentioning

confidence: 99%

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Almeida,

Merillas,

Pontinha

2024

IJMS

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Aerogels are unique solid-state materials composed of interconnected 3D solid networks and a large number of air-filled pores. This structure leads to extended structural characteristics as well as physicochemical properties of the nanoscale building blocks to macroscale, and integrated typical features of aerogels, such as high porosity, large surface area, and low density, with specific properties of the various constituents. Due to their combination of excellent properties, aerogels attract much interest in various applications, ranging from medicine to construction. In recent decades, their potential was exploited in many aerogels’ materials, either organic, inorganic or hybrid. Considerable research efforts in recent years have been devoted to the development of aerogel-based biosensors and encouraging accomplishments have been achieved. In this work, recent (2018–2023) and ground-breaking advances in the preparation, classification, and physicochemical properties of aerogels and their sensing applications are presented. Different types of biosensors in which aerogels play a fundamental role are being explored and are collected in this manuscript. Moreover, the current challenges and some perspectives for the development of high-performance aerogel-based biosensors are summarized.

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“…Organosilane, an inexpensive coupling agent, is generally used as a surface modifier, primer, or adhesive [12]. Some of its other applications are in CO2 adsorption [13,14], heavy metal detection [15], interface reagent adhesion [16], synthesis of ethyl acetate [17], manufacturing of epoxy coatings for corrosion protection [18], anti-fouling thinfilm composite [19], and base catalyst for biodiesel production [20].…”

Section: Introductionmentioning

confidence: 99%

Green Synthesis, Characterization, and Catalytic Activity of Amine-multiwalled Carbon Nanotube for Biodiesel Production

Macawile

Durian

Rubi

et al. 2022

Bull. Chem. React. Eng. Catal.

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An amine-functionalized multiwalled carbon nanotube (MWCNT) was prepared for use as a basic heterogeneous catalyst for the conversion of Cocos nucifera (coconut) oil and Hibiscus cannabinus (kenaf) oil to biodiesel. The 3-aminopropyltrimethoxysilane (3-APTMS) was chosen to form an amine-reactive surface to bind with hydroxyl (−OH) and carboxyl (−COOH) groups of oxidized MWCNT. Silanization took place using a green surface modification method in which supercritical carbon dioxide fluid was utilized under the following conditions: 55 °C, 9 MPa, and 1 h. The synthesized catalyst was characterized using Thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), Field emission scanning electron microscopy–energy dispersive x-ray (FESEM-EDX), Time-of-flight secondary ion mass spectrometry (TOF-SIMS), X-ray powder diffraction (XRD), and Brunauer–Emmett-Teller (BET). Transesterification of coconut oil using 10 wt% NH2-MWCNT catalyst (3 wt% APTMS), 12:1 molar ratio of methanol and oil at 63 °C for 1 h resulted in a >95% conversion. On the other hand, the same catalyst was used in the transesterification of kenaf oil, and formation of ammonium carboxylated salt was observed. The effects of temperature, pressure, and silane concentration on surface modification of MWCNT were evaluated in terms of the catalyst’s basic site density and fatty acid methyl ester conversion. The results indicate that reaction temperature and silane concentration had the most significant effects. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

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Colorimetric detection of heavy metal ions using aminosilane

Cited by 27 publications

References 26 publications

Colorimetric Detection of Multiple Metal Ions Using Schiff Base 1-(2-Thiophenylimino)-4-(N-dimethyl)benzene

Colorimetric Detection of Multiple Metal Ions Using Schiff Base 1-(2-Thiophenylimino)-4-(N-dimethyl)benzene

Trends on Aerogel-Based Biosensors for Medical Applications: An Overview

Green Synthesis, Characterization, and Catalytic Activity of Amine-multiwalled Carbon Nanotube for Biodiesel Production

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