Sains Malaysiana 38(6)(2009): 863–868

Sintesis dan Pencirian Kobalt Sulfida Menggunakan Misel Ester Sukrosa

dan Kegunaan sebagai Penjerap Pewarna

(Synthesis and Characterization of Cobalt Sulfide using Sucrose Ester

Micelles and Application as Dye Adsorption Agent)

N.M. Huang*, S. Radiman, C.H. Chia

School of Applied Physics, Faculty of Science & technology,

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E. Malaysia

H.N. Lim

Chemistry Department,Faculty of Science

Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D.E., Malaysia

P.S. Khiew & W.S. Chiu

Faculty of Engineering & Computer Science, Notingham University

Jalan Broga, 43500 Semenyih, Selangor D.E., Malaysia

R. Hashim

Chemistry Department, Universiti Malaya

50603 Kuala Lumpur, Malaysia

Received: 13 January 2009 / Accepted: 27 April 2009

ABSTRAK

Kobalt sulfida telah dihasilkan dengan kaedah pemendakan kimia di dalam kehadiran 0.1% ester sukrosa S1670s. Corak pembelauan sinar-x (XRD) menunjukkan kobalt sulfida yang dihasilkan mempunyai sifat amofos dan analisis sinar-x (EDX) menunjukkan kobalt sulfida yang terbentuk mempunyai nisbah atom Co: S dalam 1:1.08 iaitu CoS. CoS yang terbentuk mempunyai struktur liang bersaiz nano (~10 nm) apabila diperhatikan di bawah elektron mikroskop transmisi (TEM) dan disahkan oleh ujian penjerapan gas nitrogen (BET). Pembentukan struktur liang adalah disebabkan oleh struktur misel ester sukrosa yang mempunyai saiz misel dalam lingkungan 10 nm. CoS yang dihasilkan diuji keupayaan penjerapan dengan metilena biru sebagai sampel pewarna. Didapati keupayaan penjerapan optimum CoS ialah 110 mg/g dan pH yang paling sesuai untuk penjerapan berlaku adalah lebih daripada 6.

Kata kunci: Ester sukrosa; kobalt sulfida; misel; penjerapan pewarna

ABSTRACT

Cobalt sulfide has been successfully formed using chemical precipitation method in the presence of 0.1% sucrose ester S1670s. X-ray diffraction (XRD) pattern of cobalt sulfide formed shows amorphous structure and EDX analysis shows atomic ratio for Co:S is 1:1.08 which is an evident of formation of CoS. Under the transmission electron microscope (TEM), CoS showed pores structure in the range of ~ 10 nm and the result is in agreement with the BET results. The formation of pores structure in the CoS material is due to the structure of sucrose ester micelle which has diameter of ~ 10 nm. Adsorption ability of CoS formed was tested using methylene blue as model dyes. The optimum absorption ability for CoS is 110mg/g while the most suitable pH for adsorption was greater than 6.

Keywords: Cobalt sulfide; dye adsorption; micelles; sucrose ester

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*Pengarang untuk surat-menyurat; email: huangnayming@gmail.com