The Malaysian Journal of Analytical Sciences Vol 11 No 1 (2007): 48 – 56

 

 

SYNTHESIS OF ZINC-ALUMINIUM-PAMOATE NANOCOMPOSIT E USING DIRECT CO-PRECIPITATION AND ION-EXCHANGE METHODS

 

Zaemah binti Jubri^*1,3 ,  Mohd Zobir bin Hussein ^2,3 , Asmah Hj Yahaya³   and Zulkarnain Zainal³

 

¹Department of Engineering Sciences and Mathematics, College of Engineering,

Universiti Tenaga Nasional,  43009 Kajang, Selangor, Malaysia.

²Nanomaterial Programme, Advanced Material Laboratory, Institute of Advanced Technology (ITMA),

UPM, 43400, Serdang, Selangor, Malaysia.

³Multifunctional Nanomaterials for Industrial Application (MULIA) Research Group,

Department of Chemistry, Universiti Putra Malaysia,

43400 Serdang, Selangor, Malaysia.

 

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-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 2   = 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.

 

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

 

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