Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites

In this study, zinc-aluminium-nitrate-LDH (ZANO) at different Zn/Al molar ratios of 1, 2, 3 and 4 were successfully synthesised via co-precipitation method. Studies on intercalation of various anions namely dodecylsulphate (DS), acetate (AC), anthranilate (AN), salicylate (SAL) acetylsalicylate (...

Full description

Saved in:

Bibliographic Details
Main Author:	Mamat, Mazidah
Format:	Thesis
Language:	English English
Published:	2008
Subjects:	Layered double hydroxides Nanocomposites (Materials) Aluminum-zinc alloys
Online Access:	http://psasir.upm.edu.my/id/eprint/5157/1/FS_2008_39.pdf
Tags:	Add Tag No Tags, Be the first to tag this record!

id	my-upm-ir.5157
record_format	uketd_dc
spelling	my-upm-ir.51572013-05-27T07:20:48Z Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites 2008 Mamat, Mazidah In this study, zinc-aluminium-nitrate-LDH (ZANO) at different Zn/Al molar ratios of 1, 2, 3 and 4 were successfully synthesised via co-precipitation method. Studies on intercalation of various anions namely dodecylsulphate (DS), acetate (AC), anthranilate (AN), salicylate (SAL) acetylsalicylate (ASAL), 2,4-dichlorophenoxy acetate (24D), naphthalene acetate (NAA) and anthraquinone-2-sulfonate (AQ2) for the formation of the nanocomposites had been carried out. The anions of DS (having 12 C) and AC (having 2 C) were chosen to study the effect of the alkyl length on the formation of the nanocomposites and it was revealed that the basal spacing values were varied depending on the size of the anion. The nanocomposites of AN, SAL and ASAL with different ortho benzoate substitution groups were prepared via co-precipitation method. The basal spacing expansions of the nanocomposites: ZAA (ca. 1.3 nm), ZAS (ca. 1.6 nm) and ZAAS (1.6 nm) compared to that of the LDH (0.9 nm) are evidence of the successful intercalation process. Anion exchange study of various anions having different number of benzene rings (24D, NAA, AQ2) and different ortho benzoate substitution groups (AN, SAL, ASAL) were carried out. ZADS was chosen as a starting material where DS (interlayer anion), was expected to exchange with the newly introduced anions. Only AQ2 and AN were successfully exchanged with DS in between the layers. Thermal decomposition of the nanocomposites (ZAA, ZAS, ZAAS) at the heating temperature of 100-1000 ºC showed that the nanocomposites were thermally stable up to 300 ºC. The release profile of the ASAL anion from ZAAS in different solutions (pH 2, 6.5, 10) revealed that the ASAL anion was rapidly released into the medium at pH 2. The interlayer spacing of ZAAS slightly reduced at pH 6.5 and at pH 10 the basal spacing shrinks due to the replacing the ASAL anion by the carbonate anion. Kinetic models of pseudo-second order could be used to describe the release of the ASAL from ZAAS. Layered double hydroxides Nanocomposites (Materials) Aluminum-zinc alloys 2008 Thesis http://psasir.upm.edu.my/id/eprint/5157/ http://psasir.upm.edu.my/id/eprint/5157/1/FS_2008_39.pdf application/pdf en public phd doctoral Universiti Putra Malaysia Layered double hydroxides Nanocomposites (Materials) Aluminum-zinc alloys Science English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Layered double hydroxides Nanocomposites (Materials) Aluminum-zinc alloys
spellingShingle	Layered double hydroxides Nanocomposites (Materials) Aluminum-zinc alloys Mamat, Mazidah Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
description	In this study, zinc-aluminium-nitrate-LDH (ZANO) at different Zn/Al molar ratios of 1, 2, 3 and 4 were successfully synthesised via co-precipitation method. Studies on intercalation of various anions namely dodecylsulphate (DS), acetate (AC), anthranilate (AN), salicylate (SAL) acetylsalicylate (ASAL), 2,4-dichlorophenoxy acetate (24D), naphthalene acetate (NAA) and anthraquinone-2-sulfonate (AQ2) for the formation of the nanocomposites had been carried out. The anions of DS (having 12 C) and AC (having 2 C) were chosen to study the effect of the alkyl length on the formation of the nanocomposites and it was revealed that the basal spacing values were varied depending on the size of the anion. The nanocomposites of AN, SAL and ASAL with different ortho benzoate substitution groups were prepared via co-precipitation method. The basal spacing expansions of the nanocomposites: ZAA (ca. 1.3 nm), ZAS (ca. 1.6 nm) and ZAAS (1.6 nm) compared to that of the LDH (0.9 nm) are evidence of the successful intercalation process. Anion exchange study of various anions having different number of benzene rings (24D, NAA, AQ2) and different ortho benzoate substitution groups (AN, SAL, ASAL) were carried out. ZADS was chosen as a starting material where DS (interlayer anion), was expected to exchange with the newly introduced anions. Only AQ2 and AN were successfully exchanged with DS in between the layers. Thermal decomposition of the nanocomposites (ZAA, ZAS, ZAAS) at the heating temperature of 100-1000 ºC showed that the nanocomposites were thermally stable up to 300 ºC. The release profile of the ASAL anion from ZAAS in different solutions (pH 2, 6.5, 10) revealed that the ASAL anion was rapidly released into the medium at pH 2. The interlayer spacing of ZAAS slightly reduced at pH 6.5 and at pH 10 the basal spacing shrinks due to the replacing the ASAL anion by the carbonate anion. Kinetic models of pseudo-second order could be used to describe the release of the ASAL from ZAAS.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mamat, Mazidah
author_facet	Mamat, Mazidah
author_sort	Mamat, Mazidah
title	Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
title_short	Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
title_full	Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
title_fullStr	Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
title_full_unstemmed	Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites
title_sort	synthesis and physico-chemical properties of zinc aluminium-layered double hydroxide and its nanocomposites
granting_institution	Universiti Putra Malaysia
granting_department	Science
publishDate	2008
url	http://psasir.upm.edu.my/id/eprint/5157/1/FS_2008_39.pdf
_version_	1747810363561213952

Synthesis and Physico-Chemical Properties of Zinc Aluminium-Layered Double Hydroxide and Its Nanocomposites

Similar Items