Search

Your search keyword '"Shah, Ambreen"' showing total 2 results
Start Over Author "Shah, Ambreen" Topic thermal analysis
2 results on '"Shah, Ambreen"'

1. A New Method of Synthesis of Polythiols Schiff Base with Sulphur and Azomethine Donors and their Characterizations by Willgeordt Kindlier.

Author

Shah, Ambreen, Mirrani, Mehtab, and Memon, G. Zuhra

Subjects
*SULFUR, *POLAR solvents, *SULFHYDRYL group, *PHENYLENEDIAMINES, *ELEMENTAL analysis, *DIAMINES, *THERMAL analysis
Abstract

Some new polythiols were derived from aromatie aldehyde (2-hydroxy benzaldehyde) and different diamines (semiearbazide, 4-phenyl, 3-thiosemiearbazide, 4-4'-oxydianiline and N, N'- dimethyl p-phenylenediamine), in the presenee of elemental sulphur. The proeess of eondensation is earried out by the Willgerodt Kindler (WK) reaetion of azomethine donor or derivatives with elemental sulphur in the presenee of a strong base as a eatalyst. The polythiols (polythioamides) were eharaeterized by different teehniques like elemental miero analysis, FTIR, UV-Vis speetroseopies, thermal analysis and viseosity measurement. The FT-IR showed the main band around 1235-1265/em-1 beeause of the formation of thiol groups in respeeted polythiols to vC=S vibrations. The polythiols indieated improved thermal solidity up to 600 °C. These polythiols were soluable in highly polar organie solvents due to their eomplex struetures. The intrinsie viseo-metrieal data of these polythiols reaehed about 0.393-0.5201 dL/g in THF. [ABSTRACT FROM AUTHOR]

Published
2023

2. Evaluation of sorption behavior of polymethylene-bis(2-hydroxybenzaldehyde) for Cu(II), Ni(II), Fe(III), Co(II) and Cd(II) ions

Author

Muhammad Yar Khuhawar, Shah Ambreen, and A Shah Asif

Subjects
Langmuir, Polymers and Plastics, Chemistry, General Chemical Engineering, Metal ions in aqueous solution, Analytical chemistry, Sorption, Metal, Adsorption, Reaction rate constant, visual_art, Materials Chemistry, visual_art.visual_art_medium, Freundlich equation, Thermal analysis
Abstract

Poly[5,5′-methylene-bis(2-hydroxybenzaldehyde)1,2-phenylenediimine] resin was prepared and characterized by employing elemental, thermal analysis, FTIR, and UV–visible spectroscopy. The metal uptake behavior of synthesized polymer towards Cu(II), Co(II), Ni(II), Fe(III) and Cd(II) ions was investigated and optimized with respect to pH, shaking speed, and equilibration time. The sorption data of all these metal ions followed Langmuir, Freundlich, and Dubinin–Radushkevich isotherms. The Freundlich parameters were computed 1/n = 0.31 ± 0.02, 0.3091 ± 0.02, 0.3201 ± 0.05, 0.368 ± 0.04, and 0.23 ± 0.01, A = 3.4 ± 0.03, 4.31 ± 0.02, 4.683 ± 0.01, 5.43 ± 0.03, and 2.8 ± 0.05 mmol g−1 for Cu(II), Co(II), Ni(II), Fe(III), and Cd(II) ions, respectively. The variation of sorption with temperature gives thermodynamic quantity (ΔH) in the range of 36.72–53.21 kJ/mol. Using kinetic equations (Morris–Weber and Lagergren equations), values of intraparticle transport and the first-order rate constant was computed for all the five metals ions. The sorption procedure is utilized to preconcentrate these ions prior to their determination by atomic absorption spectrometer. It was found that the adsorption capacity values for metal-ion intake followed the following order: Cd(II) > Co(II) > Fe(III) > Ni(II) > Cu(II).

Published
2012

Catalog

Books, media, physical & digital resources
See catalog results