Removal of Residual Aluminium-Dye Complex and Aluminium Ion from Spent Natural-Dye Solution Using Activated Carbons

  • Malee Tangsathitkulchai Suranaree University of Technology
  • Chaiyot Tangsathitkulchai Suranaree University of Technology
  • Kamonchanok Wongsooksin Suranaree University of Technology
  • Saowanee Chuyingsakuntip Nakhon Ratchasima Rajabhat University

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Abstract

The crude dye extracted from the heartwood of Ceasalpinia sappan Linn. was reacted with alum to form a solution containing a cationic dye complex of [Al(brazilien)2]+ and used for the dyeing of silk yarn. The dye solution left after dyeing was treated with coconut shell activated carbons with different pore structure and surface chemistry to remove the dye complex and with eucalyptus-based activated carbon to remove the residual aluminum ion (Al3+). Adsorption kinetics of this dye complex was well described by the pseudo-second order model and the time to reach equilibrium was relatively long, suggesting the intra-particle diffusion to be the controlling step. Isotherm data for dye adsorption of all tested carbons could be well fitted by the well-known Langmuir equation. Activated carbon containing mainly micropores was not effective in adsorbing the relatively large size of dye molecules. However, after oxidizing the carbon surface with HNO3 to fix the oxygen surface functional groups, the adsorption was enhanced significantly by electrostatic attraction. Porous activated carbon constituting larger proportion of mesopores gave higher adsorption capacity than that of microporous carbon with the dispersive-force attraction being the dominant adsorption mechanism. The adsorption of Al3+ by eucalyptus activated carbon followed the linear isotherm equation with Henry's constant of 0.74 L/mg and about 80% removal of the initial Al3+ content (8.2 mg/L) could be achieved using a typical carbon dosage of around 6 g carbon/L of dye solution.

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Author Biographies
Malee Tangsathitkulchai

School of Chemistry, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand

Chaiyot Tangsathitkulchai

School of Chemical Engineering, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand

Kamonchanok Wongsooksin

School of Chemical Engineering, Suranaree University of Technology, Muang District, Nakhon Ratchasima 30000, Thailand

Saowanee Chuyingsakuntip

Faculty of Science and Technology, Nakhon Ratchasima Rajabhat University, Thailand

Published
Vol 16 No 5, Jul 3, 2012
How to Cite
M. Tangsathitkulchai, C. Tangsathitkulchai, K. Wongsooksin, and S. Chuyingsakuntip, “Removal of Residual Aluminium-Dye Complex and Aluminium Ion from Spent Natural-Dye Solution Using Activated Carbons”, Eng. J., vol. 16, no. 5, pp. 29-44, Jul. 2012.

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