Adsorption of aqueous nitrophenols on clinoptilolite

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Vol. 180; no. 1; pp. 1 - 6
• Main Authors: Sismanoglu, T, Pura, S
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-05-2001
• Subjects: Adsorption rate; Freundlich and Langmuir type isotherm; Natural zeolite; Nitrophenols; Natural zeolite; Nitrophenols; Adsorption rate; Freundlich and Langmuir type isotherm
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/S0927-7757(00)00751-2

The adsorption of
o-,
m- and
p-nitrophenols on clinoptilolite type natural zeolite has been studied as a function of the solution concentration and temperature. The adsorption rates were observed to be equal to the first-order kinetics. The rate constants were calculated for 25.0–40.0–50.0°C at constant concentration. The activation energies, (
E
a) for nitrophenoles adsorption on zeolite, were estimated using the Arrhenius equation. Thermodynamic parameters were calculated for all nitrophenols. Adsorption isotherms of
o-,
m- and
p-nitrophenols on natural zeolite were determined. These isotherms were modeled according to the Freundlich and Langmuir adsorption isotherms. The isotherms for nitrophenols on clinoptilolite were assigned as L curves. The L curve of
p-nitrophenol is two step while the L curves of
o- and
m-nitrophenols are one-step.