title: Surface modifications of illite in concentrated lime solutions investigated by pyridine adsorption.
abstract: The surface properties and functionality of an illite-containing clay mineral in alkaline solutions containing increasing quantities of calcium hydroxide were investigated using FTIR monitored pyridine adsorption at various temperatures. Results showed that the binding behavior of electron donor pyridine molecules to illite platelets is mostly governed by electron acceptor sites located at the edges of the clay particles. The binding of bulky hydrated calcium ions at the surface of the illite platelets decreases the surface area of illite. Moderate thermal treatments up to 450°C do not affect the structure of the clay mineral but strongly decrease the number of Lewis and Brönsted sites available at the edges of the clay platelets.
authors: LCMI, Laboratoire de Chimie des Matériaux Inorganiques, UFR SSMT, Université de Cocody-Abidjan, 22 BP 582 Abidjan 22, Côte d'Ivoire. leonkonan2000@yahoo.fr
authors: K L
authors: KL
authors: Konan
authors: C
authors: C
authors: Peyratout
authors: A
authors: A
authors: Smith
authors: J-P
authors: JP
authors: Bonnet
authors: P
authors: P
authors: Magnoux
authors: P
authors: P
authors: Ayrault
mesh_terms: D000327:Adsorption; D000538:Aluminum Silicates / Q000737:chemistry; D001665:Binding Sites; D002118:Calcium / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D002126:Calcium Hydroxide / Q000737:chemistry*; D000077215:Clay; D004583:Electrons; D006358:Hot Temperature; D007477:Ions / Q000737:chemistry; D008903:Minerals / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties
chemical_list: D000538:Aluminum Silicates; D017610:Calcium Compounds; D007477:Ions; D008903:Minerals; D010087:Oxides; D011725:Pyridines; C099089:illite; C016538:lime; C023666:pyridine; D002126:Calcium Hydroxide; D002118:Calcium; D000077215:Clay