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Synthesis of “L-cysteine–graphene oxide” hybrid by new methods and elucidation of its uptake properties for Hg(II) ion
, Article Separation Science and Technology (Philadelphia) ; Volume 53, Issue 6 , 2018 , Pages 843-855 ; 01496395 (ISSN) ; Outokesh, M ; Akbari, A ; Kosari, M ; Tayyebi, A ; Sharif University of Technology
Taylor and Francis Inc
2018
Abstract
This study introduces two new, simple, and scalable methods for synthesis of “cysteine–graphene oxide” hybrid, namely nucleophilic and covalent methods. Produced adsorbents could uptake 500 and 600 mg Hg2+/g, respectively, which are larger than capacities of most of the commercial adsorbents. By means of different instrumental techniques, chemical structures of the obtained graphene products were disclosed, and two pertinent mechanisms for their formations were suggested. Time for attaining uptake equilibrium for nucleophilic/covalent samples was 30 min/150 min, and kinetics was controlled by liquid film resistance/chemical reaction mechanisms, respectively. High selectivity and good...
New efficient inorganic-organic nanofibers electrospun membrane for fluorescence detection and removal of mercury (II) ions
, Article Journal of Molecular Structure ; Volume 1179 , 2019 , Pages 242-251 ; 00222860 (ISSN) ; Poush, M. K ; Ahmed, M ; Parsaee, Z ; Sharif University of Technology
Elsevier B.V
2019
Abstract
In this study, a new inorganic-organic nano fibrous membrane (PTSNFM) has been fabricated via immobilization of carbazol-based Schiff base (S) into a polyvinyl alcohol (PVA) - tetraethyl orthosilicate (TEOS) polymeric support using the electrospinning method. PTSNFM has been used as an optode to detect and remove of mercury (II) ions. The characterization of PTSNFM has been fully carried out using different methods including FE-SEM, TEM, AFM, viscosity, surface tension and conductivity. FE-SEM and FT-IR analysis demonstrated the binding of Hg (II) to the PTSNFM via chelating of Hg (II) to the Schiff base ligand. PTSNFM can detect Hg (II) in the dynamic range of 0.020–0.50 ng/mL, with the LOD...
Simulated and measured neutron/gamma light output distribution for poly-energetic neutron/gamma sources
, Article Journal of Instrumentation ; Volume 13, Issue 3 , March , 2018 ; 17480221 (ISSN) ; Zangian, M ; Aghabozorgi, S ; Sharif University of Technology
Institute of Physics Publishing
2018
Abstract
In the present paper, the light output distribution due to poly-energetic neutron/gamma (neutron or gamma) source was calculated using the developed MCNPX-ESUT-PE (MCNPX-Energy engineering of Sharif University of Technology-Poly Energetic version) computational code. The simulation of light output distribution includes the modeling of the particle transport, the calculation of scintillation photons induced by charged particles, simulation of the scintillation photon transport and considering the light resolution obtained from the experiment. The developed computational code is able to simulate the light output distribution due to any neutron/gamma source. In the experimental step of the...
A new strategy to design colorful ratiometric probes and its application to fluorescent detection of Hg(II)
, Article Sensors and Actuators, B: Chemical ; Volume 259 , 2018 , Pages 894-899 ; 09254005 (ISSN) ; Hormozi Nezhad, M. R ; Mahmoudi, M ; Sharif University of Technology
Elsevier B.V
2018
Abstract
A new strategy has been proposed to expand color-tunability of ratiometric fluorescent probes. It was shown that the combination of blue emissive color (as an internal standard) and yellow emissive color (as a probe) is an efficient way to create an extensive color range in ratiometric probes. However, due to the nature of the interaction between the analyte and the probe in terms of fluorescence quenching, occurance of the redshift in the emission is the major provision of such a probe. Our developed ratiometric fluorescence probe consists of blue emissive carbon dots (BCDs) and thioglycolic acid (TGA)-capped yellow emissive cadmium telluride (CdTe) quantum dots (YQDs). The ratiometric...
Development of an experimental method based on Compton backscattering to measure the wax thickness in petroleum pipelines
, Article Journal of Instrumentation ; Volume 16, Issue 10 , 2021 ; 17480221 (ISSN) ; Taheri, A ; Askari, M ; Sharif University of Technology
IOP Publishing Ltd
2021
Abstract
Wax deposition inside pipelines is a major concern in oil and gas industries, and it must be continuously monitored. In this paper, a mathematical-experimental combined method based on the Compton scattering was proposed to determine the thickness of the wax deposited inside the industrial pipes. For this purpose, first, the relationship between the intensity of the backscattered gamma-rays and the thickness of the wax inside the pipe was mathematically modeled. Then, an experimental setup was prepared for measuring the intensity of the backscattered gamma-rays from the pipes with different wall thicknesses and different wax widths. Finally, the experimentally measured counts were used by...
Promotional effect of macrocyclization in O2Nx naphtha-aza-crown macrocyclic ligands on fluorescence chemosensing of Al(III)
, Article Journal of Luminescence ; Volume 205 , 2019 , Pages 219-227 ; 00222313 (ISSN) ; Zarepour jevinani, M ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Two new macrocyclic ligands Ln (L and L′) bearing two fluorophore naphthalene moieties were synthesized and characterized by employing 1H and 13C NMR, IR, microanalysis as well as mass spectrometry. Comparative studies on the effect of assorted metal cations as Cr(III), Cu(II), Zn(II), Cd(II), Pb(II), Na(I), Ni(II), Co(II), Ba(II), Fe(II), Al(III), Mg(II), Cs(I), Ca(II), Hg(II), K(I), Mn(II), Ag(I), Fe(III) on fluorescence and UV–vis spectra of Ln in ethanol illustrated that both of the macrocycles were sensitive and selective fluorescence chemosensors for Al(III). Remarkable binding constant values as 1.36 × 105 M−1 and 1.15 × 105 M−1 alongside 1:1 stoichiometry for Al(III)/L and Al(III)/L′...
Promotional effect of macrocyclization in O2Nx naphtha-aza-crown macrocyclic ligands on fluorescence chemosensing of Al(III)
, Article Journal of Luminescence ; Volume 205 , 2019 , Pages 219-227 ; 00222313 (ISSN) ; Zarepour jevinani, M ; Sharif University of Technology
Elsevier B.V
2019
Abstract
Two new macrocyclic ligands Ln (L and L′) bearing two fluorophore naphthalene moieties were synthesized and characterized by employing 1H and 13C NMR, IR, microanalysis as well as mass spectrometry. Comparative studies on the effect of assorted metal cations as Cr(III), Cu(II), Zn(II), Cd(II), Pb(II), Na(I), Ni(II), Co(II), Ba(II), Fe(II), Al(III), Mg(II), Cs(I), Ca(II), Hg(II), K(I), Mn(II), Ag(I), Fe(III) on fluorescence and UV–vis spectra of Ln in ethanol illustrated that both of the macrocycles were sensitive and selective fluorescence chemosensors for Al(III). Remarkable binding constant values as 1.36 × 105 M−1 and 1.15 × 105 M−1 alongside 1:1 stoichiometry for Al(III)/L and Al(III)/L′...
Development of a novel carboxamide-based off-on switch fluorescence sensor: Hg2+, Zn2+and Cd2+
, Article New Journal of Chemistry ; Volume 44, Issue 27 , June , 2020 , Pages 11841-11852 ; Bagherzadeh, M ; Meghdadi, S ; Rabiee, N ; Abbasi, A ; Schenk Joß, K ; Tahriri, M ; Tayebi, L ; Webster, T. J ; Sharif University of Technology
Royal Society of Chemistry
2020
Abstract
Here, the carboxamide ligand N-(thiazole-2-yl) picolinamide (L) was synthesized in an ionic liquid tetrabutylammonium bromide (TBAB) as the benign reaction medium. The sensitivity of L towards different metal-ions was investigated, and a comprehensive, logical optical investigation was conducted for the IIB transition metal ions, Hg2+, Cd2+ and Zn2+, based on off-on switch sensor protocols. In the absence of these metal ions, L showed weak emission only, but fluorescence intensity increased considerably upon their addition to a sensitivity range of 10-6 M. This phenomenon was enhanced significantly in the presence of Zn2+ compared to other metal ions, likely due to the coordination of...