Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons

O. M. Couto; I. Matos; I. M. Fonseca; P. A. Arroyo; E. A. Silva; M. A.S.D. Barros

Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons

O. M. Couto, I. Matos, I. M. Fonseca, P. A. Arroyo, E. A. Silva, M. A.S.D. Barros

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

There has been little research into the effects of the water hardness and pH of surface waters on the adsorption of caffeine on activated carbons. The aim of this study was to determine the influence of these water characteristics on different activated carbons. Caffeine adsorption from the aqueous phase was studied using biomass derived activated carbons (DD: dendě coco and BB: babassu coco) and a commercially available activate carbon (NO: norit® GAC 1240 plus). The functionalized carbons in an inert atmosphere was also studied and were denominated DI, BI, NI. Results highlight the importance of pH in caffeine adsorption: the highest removals were obtained for pH 3.0 and decrease for higher pH. The adsorption isotherms obtained were fitted to the Freundlich and Langmuir equation. Calcium and magnesium ions were adsorbed to a varied extent on the activated carbons. The hardness in solution decreased their adsorption due to a competition effect. K_F and q_m from the Freundlich equation linearly decreased with water hardness due to salt-screened electrostatic repulsions between charged molecules. The amount adsorbed from deionized water was largest, because there was no competition between inorganic ions and molecules.

Original language	English
Title of host publication	21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014
Publisher	Czech Society of Chemical Engineering
Pages	1681-1700
Number of pages	20
Volume	3
ISBN (Electronic)	9781510828131
Publication status	Published - 1 Jan 2014
Event	21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014 - Prague, Czech Republic Duration: 23 Aug 2014 → 27 Aug 2014

Conference

Conference	21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014
Country/Territory	Czech Republic
City	Prague
Period	23/08/14 → 27/08/14

Keywords

Activated carbons
Adsorption kinetics
Caffeine
Water hardness

Cite this

Couto, O. M., Matos, I., Fonseca, I. M., Arroyo, P. A., Silva, E. A., & Barros, M. A. S. D. (2014). Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons. In 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014 (Vol. 3, pp. 1681-1700). Czech Society of Chemical Engineering.

Couto, O. M. ; Matos, I. ; Fonseca, I. M. et al. / Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons. 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014. Vol. 3 Czech Society of Chemical Engineering, 2014. pp. 1681-1700

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abstract = "There has been little research into the effects of the water hardness and pH of surface waters on the adsorption of caffeine on activated carbons. The aim of this study was to determine the influence of these water characteristics on different activated carbons. Caffeine adsorption from the aqueous phase was studied using biomass derived activated carbons (DD: dend{\v e} coco and BB: babassu coco) and a commercially available activate carbon (NO: norit{\textregistered} GAC 1240 plus). The functionalized carbons in an inert atmosphere was also studied and were denominated DI, BI, NI. Results highlight the importance of pH in caffeine adsorption: the highest removals were obtained for pH 3.0 and decrease for higher pH. The adsorption isotherms obtained were fitted to the Freundlich and Langmuir equation. Calcium and magnesium ions were adsorbed to a varied extent on the activated carbons. The hardness in solution decreased their adsorption due to a competition effect. KF and qm from the Freundlich equation linearly decreased with water hardness due to salt-screened electrostatic repulsions between charged molecules. The amount adsorbed from deionized water was largest, because there was no competition between inorganic ions and molecules.",

keywords = "Activated carbons, Adsorption kinetics, Caffeine, Water hardness",

author = "Couto, {O. M.} and I. Matos and Fonseca, {I. M.} and Arroyo, {P. A.} and Silva, {E. A.} and Barros, {M. A.S.D.}",

year = "2014",

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booktitle = "21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014",

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Couto, OM, Matos, I , Fonseca, IM, Arroyo, PA, Silva, EA & Barros, MASD 2014, Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons. in 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014. vol. 3, Czech Society of Chemical Engineering, pp. 1681-1700, 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014, Prague, Czech Republic, 23/08/14.

Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons. / Couto, O. M.; Matos, I.; Fonseca, I. M. et al.
21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014. Vol. 3 Czech Society of Chemical Engineering, 2014. p. 1681-1700.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

TY - GEN

T1 - Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons

AU - Couto, O. M.

AU - Matos, I.

AU - Fonseca, I. M.

AU - Arroyo, P. A.

AU - Silva, E. A.

AU - Barros, M. A.S.D.

PY - 2014/1/1

Y1 - 2014/1/1

N2 - There has been little research into the effects of the water hardness and pH of surface waters on the adsorption of caffeine on activated carbons. The aim of this study was to determine the influence of these water characteristics on different activated carbons. Caffeine adsorption from the aqueous phase was studied using biomass derived activated carbons (DD: dendě coco and BB: babassu coco) and a commercially available activate carbon (NO: norit® GAC 1240 plus). The functionalized carbons in an inert atmosphere was also studied and were denominated DI, BI, NI. Results highlight the importance of pH in caffeine adsorption: the highest removals were obtained for pH 3.0 and decrease for higher pH. The adsorption isotherms obtained were fitted to the Freundlich and Langmuir equation. Calcium and magnesium ions were adsorbed to a varied extent on the activated carbons. The hardness in solution decreased their adsorption due to a competition effect. KF and qm from the Freundlich equation linearly decreased with water hardness due to salt-screened electrostatic repulsions between charged molecules. The amount adsorbed from deionized water was largest, because there was no competition between inorganic ions and molecules.

AB - There has been little research into the effects of the water hardness and pH of surface waters on the adsorption of caffeine on activated carbons. The aim of this study was to determine the influence of these water characteristics on different activated carbons. Caffeine adsorption from the aqueous phase was studied using biomass derived activated carbons (DD: dendě coco and BB: babassu coco) and a commercially available activate carbon (NO: norit® GAC 1240 plus). The functionalized carbons in an inert atmosphere was also studied and were denominated DI, BI, NI. Results highlight the importance of pH in caffeine adsorption: the highest removals were obtained for pH 3.0 and decrease for higher pH. The adsorption isotherms obtained were fitted to the Freundlich and Langmuir equation. Calcium and magnesium ions were adsorbed to a varied extent on the activated carbons. The hardness in solution decreased their adsorption due to a competition effect. KF and qm from the Freundlich equation linearly decreased with water hardness due to salt-screened electrostatic repulsions between charged molecules. The amount adsorbed from deionized water was largest, because there was no competition between inorganic ions and molecules.

KW - Activated carbons

KW - Adsorption kinetics

KW - Caffeine

KW - Water hardness

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M3 - Conference contribution

AN - SCOPUS:85009144620

VL - 3

SP - 1681

EP - 1700

BT - 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014

PB - Czech Society of Chemical Engineering

T2 - 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014

Y2 - 23 August 2014 through 27 August 2014

ER -

Couto OM, Matos I , Fonseca IM, Arroyo PA, Silva EA, Barros MASD. Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons. In 21st International Congress of Chemical and Process Engineering, CHISA 2014 and 17th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2014. Vol. 3. Czech Society of Chemical Engineering. 2014. p. 1681-1700

Effect of solution ph and influence of water hardness on caffeine adsorption onto activated carbons

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