THERMAL AND MECHANICAL EFFECTS ON NATURAL AND ACTIVATED SMECTITE STRUCTURE

Authors
VOLZONE C SANCHEZ RMT
Citation
C. Volzone et Rmt. Sanchez, THERMAL AND MECHANICAL EFFECTS ON NATURAL AND ACTIVATED SMECTITE STRUCTURE, Colloids and surfaces. A, Physicochemical and engineering aspects, 81, 1993, pp. 211-216
Citations number
11
Categorie Soggetti
Chemistry Physical
Journal title
Colloids and surfaces. A, Physicochemical and engineering aspects → ACNP
ISSN journal
09277757
Volume
81
Year of publication
1993
Pages
211 - 216
Database
ISI
SICI code
0927-7757(1993)81:<211:TAMEON>2.0.ZU;2-A
Abstract
Thermal and mechanical treatment effects on a raw smectite (E), its ac id activated product (Ea) and a commercia activated smectite (F) were studied by X-ray diffraction (XRD) and isoelectric point (IEP) measure ments using the transport number method. The samples were divided into two groups: samples of one group were heated between 350 and 950-degr ees-C and those of the other group were ground for between 300 and 360 0 s. Both treatments, on natural and activated smectites, shift the pH of the IEP to higher values. IEP values of activated smectites (Ea an d F) were higher than that of natural samples (E), explained by a remo val of structural cations and their superficial adsorption.