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Alireza Nezamzadehejhieh - One of the best experts on this subject based on the ideXlab platform.
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effect of the supported zno on clinoptilolite nano particles in the photodecolorization of semi real sample Bromothymol Blue aqueous solution
Materials Science in Semiconductor Processing, 2015Co-Authors: Mohse Ahrami, Alireza NezamzadehejhiehAbstract:Abstract Photodecolorization of Bromothymol Blue (BTB) aqueous solution using supported ZnO onto clinoptilolite nanoparticles (NCP) under Hg lamp irradiation was studied. NCP was prepared by a mechanical method using a planetary ball mill. ZnO supported samples (ZnO–NCP) were obtained by calcinations at 450 °C for 12 h followed by ion exchanging of the parent NCP with zinc(II) nitrate aqueous solutions (0.1, 0.2, 0.3 and 0.5 M) for 24 h. Raw and modified samples were characterized by XRD, FT-IR, DRS, TEM, SEM and BET. The degradation extent was monitored by UV–vis absorption as well as COD. The decolorization kinetics was fitted well to the Langmuire–Hinselwood first order rate law.
Fawzi S. Kodeh - One of the best experts on this subject based on the ideXlab platform.
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Adsorptive–removal of Bromothymol Blue as acidic–dye probe from water solution using Latvian sphagnum peat moss: thermodynamic assessment, kinetic and isotherm modeling
Current Green Chemistry, 2019Co-Authors: Said H. Lubbad, Balsam Kamal Abu Al-roos, Fawzi S. KodehAbstract:A green and environmental–friendly method for the removal of the hazardous Bromothymol Blue from aqueous solution was considered applying a hydrophilic, biocompatible and biodegradable natural sorbent of Latvian sphagnum peat moss, applying shaking-dispersive solid-phase extraction. First, the influence of shaking speed was evaluated at 300, 600, 900 U. Furthermore, the optimum conditions of dye-adsorption, such as pH, adsorption-equilibrium contact time, adsorbent mass, and adsorbate initial concentration were investigated. In addition, the adsorption equilibrium isotherms, thermodynamics, and kinetics were studied. Thus, the optimum removal of Bromothymol Blue was concluded at a shaking speed of 600 U. Regarding the dye adsorption at different pH, Bromothymol Blue showed two removal maxima at acidic (pH 2.5) and almost neutral (pH 7.5) media, reaching dye % removal of 80.8 and 88.2 %, respectively, in 120 min of adsorption equilibrium contact time. Moreover, the dye removal improved reasonably by increasing the concentration and the sphagnum dose. Additionally, the equilibrium isotherm plot correlated comparably to Langmuir's and Freundlich's models. Also, the adsorption kinetic study demonstrated a better correlation to pseudo-secondorder plot than to pseudo-first-order one. Finally, excellent reproducibility in % removal was demonstrated with RSD values of 2.2 and 2.7% at pH of 7.5 and 2.5, respectively.
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Sol–gel entrapment of Bromothymol Blue (BTB) indicator in the presence of cationic 16E1Q and 16E1QS surfactants
Journal of Sol-Gel Science and Technology, 2016Co-Authors: Issa M. El-nahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H. Abd El-salam, Sharbat A. BakerAbstract:Sol–gel entrapment method was used to entrap Bromothymol Blue (BTB) pH indicator into mesoporous silica materials in the presence of cationic surfactants: 2-(hexadecyloxy)-2-oxoethyl-N,N,N-triethyl ammonium iodide (16E1Q) and 2-(hexadecyloxy)-2-oxoethanaminium-p-toluene sulfonate (16E1QS). The use of this new family of surfactants has modified the morphology and porosity of silica host matrix for better sensing capability and for faster response toward pH change. The physical interactions between BTB molecules and host mesoporous silica network were based on the nature of the surfactant. The presence of surfactants has shifted pKa values of more basic in comparison with that of BTB-entrapped silica system.
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sol gel entrapment of Bromothymol Blue btb indicator in the presence of cationic 16e1q and 16e1qs surfactants
Journal of Sol-Gel Science and Technology, 2016Co-Authors: Issa M Elnahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma Abd H Elsalam, Sharbat A. BakerAbstract:Sol–gel entrapment method was used to entrap Bromothymol Blue (BTB) pH indicator into mesoporous silica materials in the presence of cationic surfactants: 2-(hexadecyloxy)-2-oxoethyl-N,N,N-triethyl ammonium iodide (16E1Q) and 2-(hexadecyloxy)-2-oxoethanaminium-p-toluene sulfonate (16E1QS). The use of this new family of surfactants has modified the morphology and porosity of silica host matrix for better sensing capability and for faster response toward pH change. The physical interactions between BTB molecules and host mesoporous silica network were based on the nature of the surfactant. The presence of surfactants has shifted pKa values of more basic in comparison with that of BTB-entrapped silica system.
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Sol–gel encapsulation of Bromothymol Blue pH indicator in presence of Gemini 12-2-12 surfactant
Journal of Sol-Gel Science and Technology, 2014Co-Authors: Issa M. El-nahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H. Abdel-salamAbstract:A sol–gel approach was used to encapsulate Bromothymol Blue (BTB) C27H28Br2O5S pH indicator into mesoporous silica material, in presence of ethanediyl-1,2-bis(dimethyldodecylammonium chloride) (Gemini 12-2-12) surfactant. An ordered mesoporous inorganic matrix including Gemini 12-2-12 and BTB was obtained. It is found that encapsulated BTB/Gemini 12-2-12 exhibit same behavior for pH change as that of the free BTB, which indicate that only physical interaction between BTB molecules and host mesoporous silica network are obtained. The addition of Gemini 12-2-12 surfactant has increased the porosity of the host silica material and increased its sensing capability. The presence of Gemini 12-2-12 surfactant has shifted pKa values of the system to more acidic in comparison with that of free BTB, BTB entrapped silica and BTB/CTAB entrapped silica.
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sol gel encapsulation of Bromothymol Blue ph indicator in presence of gemini 12 2 12 surfactant
Journal of Sol-Gel Science and Technology, 2014Co-Authors: Issa M Elnahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H AbdelsalamAbstract:A sol–gel approach was used to encapsulate Bromothymol Blue (BTB) C27H28Br2O5S pH indicator into mesoporous silica material, in presence of ethanediyl-1,2-bis(dimethyldodecylammonium chloride) (Gemini 12-2-12) surfactant. An ordered mesoporous inorganic matrix including Gemini 12-2-12 and BTB was obtained. It is found that encapsulated BTB/Gemini 12-2-12 exhibit same behavior for pH change as that of the free BTB, which indicate that only physical interaction between BTB molecules and host mesoporous silica network are obtained. The addition of Gemini 12-2-12 surfactant has increased the porosity of the host silica material and increased its sensing capability. The presence of Gemini 12-2-12 surfactant has shifted pKa values of the system to more acidic in comparison with that of free BTB, BTB entrapped silica and BTB/CTAB entrapped silica.
Mohse Ahrami - One of the best experts on this subject based on the ideXlab platform.
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effect of the supported zno on clinoptilolite nano particles in the photodecolorization of semi real sample Bromothymol Blue aqueous solution
Materials Science in Semiconductor Processing, 2015Co-Authors: Mohse Ahrami, Alireza NezamzadehejhiehAbstract:Abstract Photodecolorization of Bromothymol Blue (BTB) aqueous solution using supported ZnO onto clinoptilolite nanoparticles (NCP) under Hg lamp irradiation was studied. NCP was prepared by a mechanical method using a planetary ball mill. ZnO supported samples (ZnO–NCP) were obtained by calcinations at 450 °C for 12 h followed by ion exchanging of the parent NCP with zinc(II) nitrate aqueous solutions (0.1, 0.2, 0.3 and 0.5 M) for 24 h. Raw and modified samples were characterized by XRD, FT-IR, DRS, TEM, SEM and BET. The degradation extent was monitored by UV–vis absorption as well as COD. The decolorization kinetics was fitted well to the Langmuire–Hinselwood first order rate law.
Shehata M. Zourab - One of the best experts on this subject based on the ideXlab platform.
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Sol–gel entrapment of Bromothymol Blue (BTB) indicator in the presence of cationic 16E1Q and 16E1QS surfactants
Journal of Sol-Gel Science and Technology, 2016Co-Authors: Issa M. El-nahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H. Abd El-salam, Sharbat A. BakerAbstract:Sol–gel entrapment method was used to entrap Bromothymol Blue (BTB) pH indicator into mesoporous silica materials in the presence of cationic surfactants: 2-(hexadecyloxy)-2-oxoethyl-N,N,N-triethyl ammonium iodide (16E1Q) and 2-(hexadecyloxy)-2-oxoethanaminium-p-toluene sulfonate (16E1QS). The use of this new family of surfactants has modified the morphology and porosity of silica host matrix for better sensing capability and for faster response toward pH change. The physical interactions between BTB molecules and host mesoporous silica network were based on the nature of the surfactant. The presence of surfactants has shifted pKa values of more basic in comparison with that of BTB-entrapped silica system.
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sol gel entrapment of Bromothymol Blue btb indicator in the presence of cationic 16e1q and 16e1qs surfactants
Journal of Sol-Gel Science and Technology, 2016Co-Authors: Issa M Elnahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma Abd H Elsalam, Sharbat A. BakerAbstract:Sol–gel entrapment method was used to entrap Bromothymol Blue (BTB) pH indicator into mesoporous silica materials in the presence of cationic surfactants: 2-(hexadecyloxy)-2-oxoethyl-N,N,N-triethyl ammonium iodide (16E1Q) and 2-(hexadecyloxy)-2-oxoethanaminium-p-toluene sulfonate (16E1QS). The use of this new family of surfactants has modified the morphology and porosity of silica host matrix for better sensing capability and for faster response toward pH change. The physical interactions between BTB molecules and host mesoporous silica network were based on the nature of the surfactant. The presence of surfactants has shifted pKa values of more basic in comparison with that of BTB-entrapped silica system.
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Sol–gel encapsulation of Bromothymol Blue pH indicator in presence of Gemini 12-2-12 surfactant
Journal of Sol-Gel Science and Technology, 2014Co-Authors: Issa M. El-nahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H. Abdel-salamAbstract:A sol–gel approach was used to encapsulate Bromothymol Blue (BTB) C27H28Br2O5S pH indicator into mesoporous silica material, in presence of ethanediyl-1,2-bis(dimethyldodecylammonium chloride) (Gemini 12-2-12) surfactant. An ordered mesoporous inorganic matrix including Gemini 12-2-12 and BTB was obtained. It is found that encapsulated BTB/Gemini 12-2-12 exhibit same behavior for pH change as that of the free BTB, which indicate that only physical interaction between BTB molecules and host mesoporous silica network are obtained. The addition of Gemini 12-2-12 surfactant has increased the porosity of the host silica material and increased its sensing capability. The presence of Gemini 12-2-12 surfactant has shifted pKa values of the system to more acidic in comparison with that of free BTB, BTB entrapped silica and BTB/CTAB entrapped silica.
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sol gel encapsulation of Bromothymol Blue ph indicator in presence of gemini 12 2 12 surfactant
Journal of Sol-Gel Science and Technology, 2014Co-Authors: Issa M Elnahhal, Shehata M. Zourab, Fawzi S. Kodeh, Fatma H AbdelsalamAbstract:A sol–gel approach was used to encapsulate Bromothymol Blue (BTB) C27H28Br2O5S pH indicator into mesoporous silica material, in presence of ethanediyl-1,2-bis(dimethyldodecylammonium chloride) (Gemini 12-2-12) surfactant. An ordered mesoporous inorganic matrix including Gemini 12-2-12 and BTB was obtained. It is found that encapsulated BTB/Gemini 12-2-12 exhibit same behavior for pH change as that of the free BTB, which indicate that only physical interaction between BTB molecules and host mesoporous silica network are obtained. The addition of Gemini 12-2-12 surfactant has increased the porosity of the host silica material and increased its sensing capability. The presence of Gemini 12-2-12 surfactant has shifted pKa values of the system to more acidic in comparison with that of free BTB, BTB entrapped silica and BTB/CTAB entrapped silica.
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ENCAPSULATION OF Bromothymol Blue INTO A POLYSILOXANE NETWORK MATRIX IN THE PRESENCE OF SURFACTANTS
Journal of Dispersion Science and Technology, 2011Co-Authors: I M El Nahhal, Shehata M. Zourab, F S QuidahAbstract:Bromothymol Blue (BTB) pH indicator was encapsulated into polysiloxane network using the sol-gel process. Transparent monolithic disks of entrapped BTB were obtained in the presence of cetyl trimethyl ammonium bromide (CTAB) or dodecyl dimethyl amino oxide (Genaminox LA, GLA) surfactant. Ultraviolet visible spectra showed that the encapsulated BTB retains its structure in terms of its response to pH. The kinetic studies reveal that there was a faster response to pH in the case of GLA surfactant than in the case of CTAB. It is found that the co-entrapment of cationic surfactant CTAB or zwitterionic surfactant GLA with TEOS has shifted the equilibrium of the BTB to the ionized form due to the electrostatic interaction between the surfactant and the BTB anion and therefore the base form becomes more pronounced (e.g., shift from yellow to red) than that of sol-gel matrix without surfactant.
Ahmed F. Al-hossainy - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, structural characterization, DFT, kinetics and mechanism of oxidation of Bromothymol Blue: application to textile industrial wastewater treatment
Chemical Papers, 2020Co-Authors: Samia M. Ibrahim, Ahmed F. Al-hossainyAbstract:Oxidation of Bromothymol Blue [BTB] by oxyanion potassium permanganate as a strong oxidizing agent in acid solutions using perchloric acid at a constant ionic strength has been obtained keto Bromothymol Blue [BTB]^Keto and studied kinetically spectrophotometrically. Different characterization techniques for [BTB] and [BTB]^Keto such as Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–Vis), and optical properties have been used. The order about the permanganate ion is first, while a fractional first order was released as regards [H^+] and [BTB] fractional first order. Dependence on the concentration of hydrogen ions in the concentrations indicates that the oxidation process is acid catalyzed. The absence of either transient Mn^III and/or Mn^IV as involving species in the oxidation process was verified by Mn^II applied to the oxidation reaction. Formation of 1:1 intermediate complex formation kinetically was revealed during the rate-determination step. In the slowest step, two-electron transfer processes of the inner-sphere form have been proposed. A mechanism of the tentative reaction was proposed and explored concerning kinetic parameters. The density functional theory ( DFT ) by DMol ^ 3 and CASTEP was used for the optimization of dye [BTB] and [BTB]^Keto as an isolated molecule. From the UV–Vis spectrum of [BTB] and [BTB]^Keto, the $$E_{\text{Direct}}^{\text{Opt}}$$ E Direct Opt values are 2.849 eV and 2.35 eV using Tauc`s equation, respectively, related to direct transitions of electrons. Using DMol ^ 3 method with DFT simulation, the HOMO and LUMO values for [BTB] and [BTB]^Keto as isolated molecule are 3.047 eV and 2.869 eV, respectively. The simulated FTIR, molecular electrostatic potential (MEP) and optical properties by Gaussian software and CATSTEP are in great agreement with the experimental study. Graphic Abstract
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Synthesis, structural characterization, DFT, kinetics and mechanism of oxidation of Bromothymol Blue: application to textile industrial wastewater treatment
Chemical Papers, 2020Co-Authors: Samia M. Ibrahim, Ahmed F. Al-hossainyAbstract:Oxidation of Bromothymol Blue [BTB] by oxyanion potassium permanganate as a strong oxidizing agent in acid solutions using perchloric acid at a constant ionic strength has been obtained keto Bromothymol Blue [BTB]^Keto and studied kinetically spectrophotometrically. Different characterization techniques for [BTB] and [BTB]^Keto such as Fourier-transform infrared spectroscopy (FTIR), ultraviolet–visible spectroscopy (UV–Vis), and optical properties have been used. The order about the permanganate ion is first, while a fractional first order was released as regards [H^+] and [BTB] fractional first order. Dependence on the concentration of hydrogen ions in the concentrations indicates that the oxidation process is acid catalyzed. The absence of either transient Mn^III and/or Mn^IV as involving species in the oxidation process was verified by Mn^II applied to the oxidation reaction. Formation of 1:1 intermediate complex formation kinetically was revealed during the rate-determination step. In the slowest step, two-electron transfer processes of the inner-sphere form have been proposed. A mechanism of the tentative reaction was proposed and explored concerning kinetic parameters. The density functional theory ( DFT ) by DMol ^ 3 and CASTEP was used for the optimization of dye [BTB] and [BTB]^Keto as an isolated molecule. From the UV–Vis spectrum of [BTB] and [BTB]^Keto, the $$E_{\text{Direct}}^{\text{Opt}}$$ E Direct Opt values are 2.849 eV and 2.35 eV using Tauc`s equation, respectively, related to direct transitions of electrons. Using DMol ^ 3 method with DFT simulation, the HOMO and LUMO values for [BTB] and [BTB]^Keto as isolated molecule are 3.047 eV and 2.869 eV, respectively. The simulated FTIR, molecular electrostatic potential (MEP) and optical properties by Gaussian software and CATSTEP are in great agreement with the experimental study. Graphic Abstract
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Kinetics and mechanism of oxidation of Bromothymol Blue by permanganate ion in acidic medium: Application to textile industrial wastewater treatment
Journal of Molecular Liquids, 2020Co-Authors: Samia M. Ibrahim, Ahmed F. Al-hossainyAbstract:Abstract Oxidation of Bromothymol Blue (BTB) by oxyanion potassium permanganate as a strong oxidizing agent in acidic solutions using perchloric acid at a constant ionic strength of 1.0 mol dm−3 has been studied kinetically spectrophotometrically. The order is first-order in [MnO4−], while a fractional-first-order in both [H+] and [BTB]. The dependency on the hydrogen ion concentration of the rates shows the oxidation reaction is acid-catalyzed. Absence of either MnIII and/or MnIV transient species as involvement species in the oxidation process was confirmed from MnII added to the oxidation reaction. Formation of 1:1 intermediate complex formation kinetically was revealed during the rate-determining step. In the slowest step two-electron transfer processes of the inner-sphere form have been proposed. A mechanism of tentative reaction was proposed and explored with respect to kinetic parameters. Identification of the oxidation product revealed the formation of keto-BTB as derivative of Bromothymol Blue oxidation. The product of oxidation was isolated and identify using elemental analysis and Fourier Transform Infrared (FTIR) spectra.
