Open AccessAdsorption Characteristics of Organic Dyes on Alumina Powder from Aqueous Solutions
Author(s) -
M. Saleem,
Adeel Afzal,
Talha Naeem,
F. Mahmood
Publication year - 1994
Publication title -
adsorption science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.682
H-Index - 36
eISSN - 2048-4038
pISSN - 0263-6174
DOI - 10.1177/026361749401100203
Subject(s) - adsorption , chemistry , aqueous solution , freundlich equation , orange (colour) , inorganic chemistry , methyl orange , organic chemistry , nuclear chemistry , catalysis , photocatalysis , food science
Adsorption of industrially important dyes (Acid Red 88, Acid Orange 8 and Bismark Brown R) on alumina from aqueous media has been investigated as a function of shaking time, amount of adsorbent, concentration of adsorbate and temperature. It is noted that the adsorption of Acid Red 88, Acid Orange 8 and Bismark Brown R on alumina decreases with an increase in temperature. The results obtained show that the adsorption isotherms at different temperatures are S-type and obey the Freundlich type of adsorption equation. Isosteric heats of adsorption (q st ) have also been calculated at different coverages from the adsorption isosters and have been interpreted. The qst values for all the adsorption systems decrease with increasing surface coverage indicating that the alumina used possessed a heterogeneous surface with sites of different activities. The results also indicate that initial adsorption, whether by chemical or physical means, occurs first on the most active sites and then, as the concentration of adsorbate is increased, on sites of lesser activity.