Adsorption and dielectric properties of poly(1-vinylimidazole) on sepiolite

Autor: Nalan Tekin, A. Uğur Kaya, Kadir Esmer, Ali Kara
Přispěvatelé: Uludağ Üniversitesi/Fen Edebiyat Fakültesi/Kimya Bölümü., Kara, Ali, AAG-6271-2019
Rok vydání: 2012
Předmět:
Thermodynamic parameter
Entropy
Poly(4-Vinylimidazole)
Aminoacylation
Imidazoles
Ac conductivity
Analytical chemistry
Electric conductivity
Enthalpy
Ionic strength
Electrical conductivity
Aqueous solution
Polyvinylimidazole
Polymer
Ionic composition
Electrophorotic mobility
Chemistry
physical
Element mobility
pH
Chemistry
Sepiolite
Langmuir adsorption model
Silica
Geology
Mineralogy
Interface interaction
Isotherm data
Materials science
multidisciplinary
Surfaces
Adsorption poly(1 vinylimidazole)
symbols
Sorption
Thermodynamics
Pure polymers
Gibbs free energy
Dye
Experimental data
Parameterization
Dielectric
symbols.namesake
Adsorption
Geochemistry and Petrology
Separation factors
Isotherm
Behavior
Second order kinetics
Aqueous-solution
Experimental mineralogy
Langmuir isotherm models
Poly(1vinylimidazole)
Concentration (composition)
Dielectric property
Materials science
Electrical conductivity
dielectric properties
Kinetics
Electrokinesis
Permittivity
Temperature effect
Freundlich models
Removal
Model
Zdroj: Applied Clay Science. 57:32-38
ISSN: 0169-1317
DOI: 10.1016/j.clay.2011.12.007
Popis: The adsorption of poly(1-vinylimidazole) (PVI) onto sepiolite from aqueous solutions was investigated as a function of some parameters such as pH, ionic strength, and temperature. The adsorption of PVI was increased with increasing pH and with decreasing ionic strength and temperature. The Langmuir isotherm model fitted the isotherm data better than the Freundlich model. The electrophorotic mobility of sepiolite dispersions was measured at different PVI concentrations and pH. The thermodynamic parameters Gibbs free energy, enthalpy, and entropy were evaluated. The dimensionless separation factor (R-L.) revealed that sepiolite can be used for adsorption of PVI from aqueous solutions. The second-order kinetics equation best fitted the experimental data. Dielectric properties of sepiolite coated with PVI have been also investigated. The sample with adsorbed PVI at 25 degrees C has the maximum the AC conductivity and the charge carriers can move easily in comparison with other samples. The real permittivities of the PVI-adsorbed samples are quite high in comparison with those of the pure polymer as a result of interface interactions. Kocaeli Üniversitesi -2007/071 Balıkesir Üniversitesi Uygulamalı Bilimler Araştırma Merkezi (BURCAS)
Databáze: OpenAIRE
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