Adsorption Equilibrium of Rhodamine 6G onto the Conchiolin Layer from Aqueous Solution

Title & Authors
Adsorption Equilibrium of Rhodamine 6G onto the Conchiolin Layer from Aqueous Solution
Shin Choon-Hwan; Song Dong-lk;

Abstract
In order to develop a dye coloring technology on Conchiolin layer in cultured pearls, appropriate dyes were selected, their solubilities in various solvents were studied, and adsorption and desorption experiments were performed. Solubilities of several basic dyes known to suitable for the pearl coloring, i.e., Rhodamine 6G(R6), Rhodamine B(RB) and Methylene Blue(MB), in several solvents (distilled water, methanol, ethanol, and acetone) were investigated. Among these dyes, R6 was chosen as a dye for single component adsorption and desorption experiment due to the relatively good solubility in various solvents tested. Solubilities of dyes were judged to be enough to color the pearls since dye concentrations in pearl coloring are, in general, not so high. The internal surface area of the pearl layer is believed to be directly related to the dye adsorption, the single-point internal surface area of the pearl layer measured at the nitrogen relative pressure of 0.3 was found to be $\small{0.913m^2/g}$, and the BET internal surface area, $\small{1.01m^2/g}$ The most probable diameters of micropores and macropores were found to be $\small{40{\AA}}$and $\small{5000{\AA}}$ respectively, from the pore size distribution data. Adsorption isotherm was well fitted to the Langmuir isotherm model, resulting in q=$\small{\frac{1.62C}{1+1.09C^{.}}}$
Keywords
Language
Korean
Cited by
1.
수용액에서의 이성분 및 삼성분 염기성 염료의 진주층에 대한 경쟁흡착,신춘환;송동익;

대한환경공학회지, 2006. vol.28. 3, pp.270-275
References
1.

2.

3.
Jossens, L., 1978, Thermodynamics of Multi-Solute Adsorption from Dilute Aqueous Solutions, Chem. Eng. Sci., 33, 1097-1106

4.
Nayyar, S. P., D. A. Sabatini and J. H. Harwell, 1994, Surfactant Adsolubilization and Modified Admicellar Sorption of Nonpolar, Polar, and Ionizable Organic Contaminants, Environ. Sci. Tech., 28, 11, 1874-1881

5.
McKay, G., 1985, The Adsorption of Dyestuffs from Aqueous Solutions Using Activated Carbon: An External Mass Transfer and Homogeneous Surface Diffusion Model, AIChE, 31, 2, 335-339

6.
Few, A. V. and R. H. Ottewill, 1956, A Spectrophotometric Method for the Determination of Cationic Detergents, J. Colloid Science, 11, 34-38

7.
Radke, C. J. and J. M. Prausnitz, 1972, Thermodynamics of Multi-Solute Adsorption from Dilute Liquid Solutions, AIChE, 18, 4, 761-768

8.
Miller, C. T. and J. A. Pedit, 1992, Use of a Reactive Surface-Diffusion Model To Describe Apparent Sorption-Desorption Hysteresis and Abiotic Degradation of Lindane in a Sub-surface Material, Environ. Sci. Tech., 26, 1417-1427

9.

10.
Kleibaum, D. G. and L. L. Kuppes, 1978, Applied Regression and Other Multivariable Methods, Duxbury Press, North Scituate, MA

11.
Yen, C. Y., 1983, The Adsorption of Phenol and Substituted Phenols on Activated Carbon in Single- and Multi-Component Systems, Ph.D. Dissertation, University of the North Carolina at Chapel Hill, U.S.A

12.
J. M. Smith, 1981, Chemical Engineering Kinetics, McGraw Hill, 3rd ed., Tokyo