Structural and thermal properties of inorganic–organic montmorillonite: Implications for their potential environmental applications

Rathnayake, Suramya I., Xi, Yunfei, Frost, Ray L., & Ayoko, Godwin A. (2015) Structural and thermal properties of inorganic–organic montmorillonite: Implications for their potential environmental applications. Journal of Colloid and Interface Science, 459, pp. 17-28.

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Abstract

Inorganic;organic clays (IOCs), clays intercalated with both organic cations such as cationic surfactants and inorganic cations such as metal hydroxy polycations have the properties of both organic and pillared clays, and thereby the ability to remove both inorganic and organic contaminants from water simultaneously. In this study, IOCs were synthesised using three different methods with different surfactant concentrations. Octadecyltrimethylammonium bromide (ODTMA) and hydroxy aluminium ([Al13O4(OH)24(H2O)12]7+ or Al13) are used as the organic and inorganic modifiers (intercalation agents). According to the results, the interlayer distance, the surfactant loading amount and the Al/Si ratio of IOCs strictly depend on the intercalation method and the intercalation agent ratio. Interlayers of IOCs synthesised by intercalating ODTMA before Al13 and IOCs synthesised by simultaneous intercalation of ODTMA and Al13 were increased with increasing the ODTMA concentration used in the synthesis procedure and comparatively high loading amounts could be observed in them. In contrast, Al/Si decreased with increasing ODTMA concentration in these two types of IOCs. The results suggest that Al-pillars can be fixed within the interlayers by calcination and any increment in the amount of ODTMA used in the synthesis procedure did not affect the interlayer distance of the IOCs. Overall the study provides valuable insights into the structure and properties of the IOCs and their potential environmental applications.

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ID Code: 92193
Item Type: Journal Article
Refereed: Yes
Keywords: Montmorillonite, Octadecyltrimethylammonium bromide, Organoclay, Hydroxy aluminium polycation, Aluminium-pillared clay, Inorganic–organic clay
DOI: 10.1016/j.jcis.2015.07.071
ISSN: 0021-9797
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2015 Elsevier
Deposited On: 21 Jan 2016 04:29
Last Modified: 29 Aug 2016 18:32

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