Synthesis of Zinc-Aluminium-Pamoate Nanocomposite Using Direct Co-precipitation and Ion-Exchange Methods.

Zaemah Jubri, and Mohd. Zobir Hussein, and Asmah Hj. Yahaya, and Zulkarnain Zainal, and Hussein, M.Z. See Mohd. Zobir Hussein and Zainal, Z. See Zulkarnain Zainal (2007) Synthesis of Zinc-Aluminium-Pamoate Nanocomposite Using Direct Co-precipitation and Ion-Exchange Methods. Malaysian Journal of Analytical Sciences, 11 (1). pp. 48-56. ISSN 13942506

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Affiliations

Universiti Tenaga Nasional, College of Engineering, Dept. of Engineering Sciences and Mahematics
Universiti Putra Malaysia, Institute of Advanced Technology, Advance Material Laboratory, Nanomaterial Programme
Universiti Putra Malaysia, Institute of Advanced Technology, Advance Material Laboratory, Nanomaterial Programme
Universiti Putra Malaysia, Dept. of Chemistry, 3Multifunctional Nanomaterials for Industrial Application (MULIA) Research Group

Abstract

The intercalation of pamoate anions into the interlamellae of zinc-aluminium layered double hydroxide (LDH) was carried out by two different methods; direct co- recipitation 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.

Penyisipan anion pamoat ke dalam lapisan hidrosida berlapis ganda (HBG) zink-aluminium telah dilakukan menggunakan dua kaedah berbeza iaitu kaedah pemendakan bersama dan penukar ion. Nisbah molar Zn/Al, R bagi HBG ditetapkan pada 2 –5 (x = 0.33 –0.16), di mana x = [Al3+]/[(Zn2+ + Al3+)] dengan kepekatan ion pamoat 0.02 M. Puncak yang tajam, berkeamatan tinggi dan simetri dapat diperhatikan daripada analisis pembelauan sinar-X (XRD) bagi kesemua sampel yang disediakan menggunakan kaedah pemendakan bersama, ini menunjukkan bahan nanokomposit berada dalam susunan yang teratur. Manakala, corak XRD bagi nanokomposit yang disediakan dengan kaedah penukar ion menunjukkan puncak kedua (006) yang lebar dan tidak simetri, ia mungkin disebabkan oleh pertindihan dua puncak pada 2q = 10°, yang menunjukkan kehadiran HBG dengan nitrat sebagai pengimbang cas. Peratus PA yang tersisip di antara lapisan nanokomposit yang disediakan dengan kaedah penukar ion adalah antara (29–45)%, yang mana ia lebih rendah berbanding dengan yang disediakan dengan kaedah pemendakan bersama, (43-51)%. Kajian ini menunjukkan kaedah pemendakan bersama menghasilkan nanokomposit dengan penyisipan bahan organik yang lebih tinggi dan kehabluran bahan yang lebih baik berbanding menggunakan kaedah penukar ion.

Item Type:

Journal

Additional Information:

We are grateful to the Malaysian Government for providing the grant under IRPA No: 09-02-0897-EA001. One of us (Z.J.) would like to thank Universiti Tenaga Nasional (UNITEN) for the scholarship.

Keywords:

Organic-inorganic hybrid; pamoic acid; layered double hydroxide, nanocomposite, Nanomaterials

Subjects:

Q Science

ID Code:

1002