Voltammetric and potentiometric characterization of magnetite electrode for the assay of weak organic acids in non-aqueous media

Introduction: Herein we report the green synthesis and characterization of silverreduced graphene oxide nanocomposites (Ag-rGO) using Acacia nilotica gum for the first time. Experimental: We demonstrate the Hg2+ ions sensing ability of the Ag-rGO nanocomposites form aqueous medium. The developed colorimetric sensor method is simple, fast and selective for the detection of Hg2+ ions in aqueous media in presence of other associated ions. A significant color change was noticed with naked eye upon Hg2+ addition. The color change was not observed for cations including Sr2+, Ni2+, Cd2+, Pb2+, Mg2+, Ca2+, Fe2+, Ba2+ and Mn2+indicating that only Hg2+ shows a strong interaction with Ag-rGO nanocomposites. Under the most suitable condition, the calibration plot (A0-A) against concentration of Hg2+ was linear in the range of 0.1-1.0 ppm with a correlation coefficient (R2) value 0.9998. Results & Conclusion The concentration of Hg2+ was quantitatively determined with the Limit of Detection (LOD) of 0.85 ppm. Also, this method shows excellent selectivity towards Hg2+ over nine other cations tested. Moreover, the method offers a new cost effective, rapid and simple approach for the detection of Hg2+ in water samples.

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Preparation and characterization of Chicory leaf powder and its application as a nano-native plant sorbent for removal of Acid Blue 25 from aqueous media: isotherm, kinetic and thermodynamic study of the adsorption phenomenon

Journal of Nanostructure in Chemistry ◽

10.1007/s40097-019-00330-z ◽

2020 ◽

Vol 10 (1) ◽

pp. 75-86 ◽

Cited By ~ 1

Author(s):

Maryam Haghighizadeh ◽

Karim Zare ◽

Hossein Aghaie ◽

Majid Monajjemi

Keyword(s):

Aqueous Media ◽

Thermodynamic Study ◽

Native Plant ◽

Adsorption Phenomenon ◽

Leaf Powder ◽

Acid Blue 25 ◽

Kinetic And Thermodynamic Study ◽

Acid Blue

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Characterization of Cigar Tobaccos by Gas Chromatographic/Mass Spectrometric Analysis of Nonvolatile Organic Acids: Application to the Authentication of Cuban Cigars

Journal of Agricultural and Food Chemistry ◽

10.1021/jf001210y ◽

2001 ◽

Vol 49 (3) ◽

pp. 1132-1138 ◽

Cited By ~ 9

Author(s):

Lay-Keow Ng ◽

Michel Hupé, ◽

Micheline Vanier ◽

Dennis Moccia

Keyword(s):

Organic Acids ◽

Mass Spectrometric ◽

Mass Spectrometric Analysis ◽

Spectrometric Analysis ◽

Chromatographic Mass

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Synthesis and Characterization of Lanthanide Metal-Organic Frameworks with Perfluorinated Linkers

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.98.70 ◽

2016 ◽

Vol 98 ◽

pp. 70-74

Author(s):

Andrius Laurikėnas ◽

Jurgis Barkauskas ◽

Aivaras Kareiva

Keyword(s):

Metal Organic Frameworks ◽

Aqueous Media ◽

Xrd Analysis ◽

X Ray Diffraction ◽

Lanthanide Elements ◽

Diffusion Controlled ◽

Benzenedicarboxylic Acid ◽

Metal Organic ◽

Lanthanide Metal

In this study, lanthanide elements (Ln3+) and 2,3,5,6-tetrafluoro-1,4-benzenedicarboxylic acid (TFBDC) based metal-organic frameworks (MOFs) were synthesized by precipitation and diffusion-controlled precipitation methods. Powders insoluble in aqueous media and polar solvents were obtained. The microstructure and properties of Ln3+ MOFs were evaluated and discussed. X-ray diffraction (XRD) analysis, infrared (FTIR) spectroscopy, scanning electron microscopy (SEM) and fluorescence spectroscopy (FLS) were carried out to characterize Ln3+ MOF's crystallinity, the microstructure, chemical composition and optical properties.

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