Synthesis of Zinc-Aluminium-Pamoate Nanocomposite using Direct Co-Precipitation and Ion-Exchange Methods

• Main Authors: Jubri @ Mohd Zufri, Zaemah, Hussein, Mohd Zobir, Yahaya, Asmah, Zainal, Zulkarnain
• Format: Article
• Language: English; English
• Published: Malaysian Society of Analytical Sciences 2007
• Online Access: http://psasir.upm.edu.my/id/eprint/11939/1/Synthesis%20of%20Zinc.pdf; http://psasir.upm.edu.my/id/eprint/11939/
• Institution: Universiti Putra Malaysia

The intercalation of pamoate anions into the interlamellae of zinc-aluminium layered double hydroxide (LDH) was carried out by two different methods; direct co-precipitation and ion-exchange methods. The Zn/Al molar ratio, R of the LDH was set at 2 - 5 (x = 0.33 – 0.16, where x = [Al3+]/[(Zn2+ + Al3+)] and the concentration of pamoate ion used was fixed at 0.02 M. A sharp, intense and symmetrical peak could be observed from the XRD patterns for all the samples synthesized by direct co-precipitation method, indicating a well-ordered nanolayered structure in the nanocomposite. However, the XRD patterns of the nanocomposite prepared by ion-exchange method show that the second peak for (006) reflection are broad and not symmetrical due to the overlapping of two peaks at 2q = 10°, which indicated the presence of LDH with nitrates as the counter anion. The percentage of PA intercalated into the interlamellae of the nanocomposite prepared by ion-exchange method is in the range of (29 – 45)%, which is lower than the one prepared by direct co-precipitation method, (43 – 51)%. This shows that direct co-precipitation method yielded nanocomposites with higher loading of the organic moiety and better crystallinity compared to the ion-exchange method.