An approach for the explicit determination of adsorption isotherms constants and its validation by experimental data

Document Type : Research paper

Abstract

Adsorption behavior of most of the batch mode adsorption processes are defined by non-linear isotherms models such as Redlich-Peterson, Radke-Prausnitz, Sips, Koble–Corrigan- model, etc. To determine the isotherms’ parameters of this type of adsorption models, a trial and error based optimization methods are inevitable which are time consuming as usually are sensitive to the chosen first guess. Therefore, in the present paper an explicit method with no need to trial and error for the determination of the non-linear adsorption models’ parameters was presented. In this approach, first the differential form of the adsorption isotherm is achieved and then the exponential parameter is determined through the intercept of this equation.  Having the exponential parameter in hand, the other constants of the isotherm are obtained from the slope and intercept of the linear plot of the concentration and the adsorption capacity. To validate the method, catecholamine modified polysulfone was synthesized for the adsorption of chromium (VI), and different adsorption models were fitted to the resultant data. In the exponential parameter determination, in comparison with the trial and error method, the relative error was less than one percent.

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References

 
[1] Malamis, S.; Katsou, E. (2013) "A review on zinc and nickel adsorption on natural and modified zeolite, bentonite and vermiculite: Examination of process parameters, kinetics and isotherms". Journal of Hazardous Materials, 252–253: 428-461.
[2] ضیاپور، ع.؛ همزه، ی؛ ابیض، ع. (1391) «استفاده از پسماند سویا به عنوان جاذب رنگ اسید اورانژ 7 از محلول آبی». نشریه علوم و مهندسی جداسازی, 4(2): 38-29.
[3] Wu, F.-C.; Liu, B.-L.; Wu, K.-T.; Tseng, R.-L. (2010) "A new linear form analysis of Redlich–Peterson isotherm equation for the adsorptions of dyes". Chemical Engineering Journal, 162(1): 21-27.
[4] Foo, K.Y.; Hameed, B.H. (2010) "Insights into the modeling of adsorption isotherm systems". Chemical Engineering Journal, 156(1): 2-10.
[5] K.Y. Foo, B.H.H. (2010) "Insights into the modeling of adsorption isotherm systems". Chemical Engineering Journal, 156: 2-10.
[6] Zohre Shahryari, A.S.G.a.M.A. (2010) "Experimental study of methylene blue adsorption from aqueous solutions onto carbon nano tubes". International Journal of Water Resources and Environmental Engineering, 2(2): 16-28.
 
[7] G. Limousin, J.-P.G., L. Charlet, S. Szenknect, V. Barthe`s, M. Krimiss (2007) "Sorption isotherms: A review on physical bases, modeling and measurement". Applied Geochemistry, 22: 249-275.
[8] Y. S. HO, J.F.P., G. MCKAY (2002) "equilibrium isotherm studies for the sorption of divalent metal ions onto peat: copper, nickel and lead single component systems". Water, Air, and Soil Pollution, 141: 1-33.
[9] Radke, C.J.; Prausnitz, J.M. (1972) "Adsorption of Organic Solutes from Dilute Aqueous Solution of Activated Carbon". Industrial & Engineering Chemistry Fundamentals, 11(4): 445-451.
 
Journal of Separation Science and Engineering
Volume 8, Issue 2
January 0
Pages 31-41

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