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

Diserahkan: 13 Januari 2009 / Diterima: 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

REFERENCES

Ahmad, A.A., Hameed, B.H. & Aziz, N. 2007. Adsorption of direct dye on palm ash: Kinetic and equilibrium modeling. Journal of Hazardous Materials 141: 70–76.

Beccera, N., toro, C., Zanocco, A.L., Lemp, E. & Gunther, G. 2008. Characterization of micelles formed by sucrose 6-O-monoesters. Colloids and Surfaces A: Physicochemical and Engineering Aspects 327: 134-139.

Beck, J.S., Vartuli, J.C., Roth, W.J., Leonowicz, M.E., Kresge, C.t., Schmitt, K.D., Chu, C.t.W., Olson, D.H., Sheppard, E.W., McCullen, S.B., Higgins, J.B. & Schlenker, J.L. 1992. A new family of mesoporous molecular-sieves prepared with liquid-crystal templates. Journal of the American Chemical Society 114: 10834-10843.

Bukallah, S.B., Rauf, M.A. & AlAli, S.S. 2007. Removal of Methylene Blue from aqueous solution by adsorption on sand. Dyes Pigments 74: 85-87.

Ganesh, R., Boardman, G.D. & Michelson, D. 1994. fate of azo dyes in sludges. Water Research 28: 1367-1376.

Ghosh, D. & Bhattacharyya, K.G. 2002. Adsorption of methylene blue on kaolinite. Applied Clay Science 20: 295-300.

Hameed, B.H., Ahmad, A.A. & Aziz, N. 2007. Isotherms, kinetics and thermodynamics of acid dye adsorption on activated palm ash. Chemical Engineering Journal 133: 195-203.

Hameed, B.H., Krishni, R.R. & Sata, S.A. 2008. A novel agricultural waste adsorbent for the removal of cationic dye from aqueous solutions. Journal of Hazardous Materials 6: 19-23.

Kannan, N. & Sundaram, M.M. 2001. Kinetics and Mechanism of removal of methylene blue by adsorption on various carbon-comparative study. Dyes Pigments 51: 25-40.

Kresge, C.t., Leonowicz, M.E., Roth, W.J., Vartuli, J.C. & Beck, J.S. 1992. Ordered mesoporous molecular sieves synthesized by a liquid-crystal template mechanism. Nature 359: 710-712.

Oʹzer, A. & Dursun, G. 2007. Removal of methylene blue from aqueous solution by dehydrated wheat bran carbon. Journal of Hazardous Materials 146: 262-269.

Pavan, F.A., Mazzocato, A.C. & Gushikem, Y. 2008. Removal of methylene blue dye from aqueous solutions by adsorption using yellow passion fruit peel as adsorbent. Bioresource Technology 99: 3162-3165.

Wang, J., Ng, S.H., Wang, G.X., Chen, J., Zhao, L., Chen, Y. & Liu, H.K. 2006. Synthesis and characterization of nanosize cobalt sulfide for rechargeable lithium batteries. Journal of Power Sources 159: 287-290.

Weber, E.J. & Adams, R.L. 1995. Chemical- and sediment-mediated reduction of azo dye disperse blue 79. Environmental Science and Technology 29: 1163-1170.

*Corresponding author; email: huangnayming@gmail.com