Removal of caffeine from aqueous solution using multi-wall carbon nanotubes: kinetic, isotherm, and thermodynamics studies

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BAHRAMI M.; AMIRI M.J.; Koochaki S.

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Journal: POLLUTION Year:2017 | Volume:3 | Issue:4 Page(s): 539-552

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Title

Removal of caffeine from aqueous solution using multi-wall carbon nanotubes: kinetic, isotherm, and thermodynamics studies

Author(s)

BAHRAMI M. | AMIRI M.J. | Koochaki S. | Issue Writer Certificate

Keywords

equilibrium

MWCNTs

non-spontaneous

zdsorption

Abstract

The occurrence of contaminants in wastewaters, and their behavior during wastewater treatment and production of drinking water are key issues to re-use water resources. The present research aims to remove caffeine from aqueous solutions via adsorption technique, using Multi-Wall Carbon Nanotubes (MWCNTs) as an adsorbent under different experimental conditions. The processing variables such as pH (2-12), contact time (1-30 min), initial concentration of caffeine (2-314 mg/L), temperature (25, 50, 80 ° C), and adsorbent mass (0. 02-0. 15 g) have been investigated with equilibrium and kinetic studies on adsorption of caffeine onto MWCNTs being also developed. Maximum caffeine removal has been obtained at pH=7 and adsorption equilibrium has been achieved in 5 min. The use of pseudo second-order kinetic model with determination coefficient of 99. 3% (R2=0. 993), has made the adsorption kinetics to be well fitted. The caffeine equilibrium adsorption data have been best fitted to Langmuir-Freundlich Model with a relatively high determination coefficient of 96. 5% (R2=0. 965) and maximum adsorption capacity of 35. 61 mg/g of caffeine on MWCNTs. The thermodynamic parameters display that the adsorption of caffeine onto MWCNTs has been non-spontaneous and endothermic in nature.

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APA: Copy

BAHRAMI, M., AMIRI, M.J., & Koochaki, S.. (2017). Removal of caffeine from aqueous solution using multi-wall carbon nanotubes: kinetic, isotherm, and thermodynamics studies. POLLUTION, 3(4), 539-552. SID. https://sid.ir/paper/348732/en

Vancouver: Copy

BAHRAMI M., AMIRI M.J., Koochaki S.. Removal of caffeine from aqueous solution using multi-wall carbon nanotubes: kinetic, isotherm, and thermodynamics studies. POLLUTION[Internet]. 2017;3(4):539-552. Available from: https://sid.ir/paper/348732/en

IEEE: Copy

M. BAHRAMI, M.J. AMIRI, and S. Koochaki, “Removal of caffeine from aqueous solution using multi-wall carbon nanotubes: kinetic, isotherm, and thermodynamics studies,” POLLUTION, vol. 3, no. 4, pp. 539–552, 2017, [Online]. Available: https://sid.ir/paper/348732/en

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