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Study of Natural Clay Adsorbent Sepiolite for the Removal of Caffeine from Aqueous Solutions: Batch and Fixed-Bed Column Operation

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Abstract

Sepiolite reveals as a low-cost and efficient adsorbent for the adsorption of caffeine from aqueous solutions. The characterization of this material was carried out by N2 adsorption–desorption at 77 K, Fourier transform infrared spectroscopy, thermogravimetric analysis, and electronic microscopy. Initially, batch adsorption experiments were developed in order to determine the equilibrium time and the adsorption isotherm of the system. Pseudo–first-order, Elovich equation, pseudo–second-order, and intra-particle diffusion models were applied to the experimental data to determine the adsorption kinetics. In continuous adsorption, the influence of several operation conditions (initial caffeine concentration, volumetric flow rate, and mass of adsorbent) on the shape of breakthrough curves and the mass transfer resistance was evaluated. Experimental data were fitted to the bed-depth service-time model bed-depth service-time (BDST). Through the calculation of the adsorption, parameters as breakthrough time or caffeine removal percentage can be concluded that the removal of this compound from aqueous solutions by adsorption in sepiolite beds is an alternative technique to the current methods, in order to eliminate this micropollutant.

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Abbreviations

α :

Elovich model initial adsorption rate, milligrams per gram per hour

b :

Langmuir adsorption equilibrium constant, liters per milligram

β :

Elovich model desorption constant, grams per milligram

C 0 :

Adsorbate inlet concentration, milligrams per liter

C :

Adsorbate concentration at any time, milligrams per liter

C b :

Adsorbate concentration at breakthrough time, milligrams per liter

C e :

Equilibrium adsorbate concentration, milligrams per liter

D :

Diffusion coefficient, square centimeters per hour

E :

Mean free energy of adsorption, kilojoules per mole

ε :

Polanyi potential

FBU:

Fractional bed utilization

K :

Dubinin–Radushkevich constant, moles squared per kilojoules squared

k AB :

BDST model adsorption rate constant, liters per milligram per hour

K F :

Freundlich constant, milligrams per gram

k 1 :

Pseudo–first-order model rate adsorption constant, per hour

k 2 :

Pseudo–second-order model rate adsorption constant, grams per milligram per hour

k i :

Intra-particle diffusion model rate parameter, milligram per gram per half hour

MTZ:

Mass transfer zone, centimeter

n F :

Freundlich constant

N 0 :

BDST model adsorption capacity, milligrams per liter

Q :

Volumetric flow rate, millimeters per minute

Q m :

Dubinin–Radushkevich maximum adsorption capacity, moles per gram

q :

Adsorption capacity at any time, milligrams per gram

q b :

Breakthrough adsorption capacity, milligrams per gram

q e :

Adsorption capacity at equilibrium, milligrams per gram

q s :

Saturation adsorption capacity, milligrams per gram

q sat :

Langmuir maximum adsorption capacity, milligrams per gram

r 0 :

Radius of the adsorbent particle, centimeters

R :

Gas constant, Joules per mole Kelvin

R L :

Separation factor

t :

Operation time, hours

t b :

Column breakthrough time, hours

t s :

Column saturation time, hours

t 1/2 :

Half adsorption time, hours

T :

Absolute temperature, Kelvin

U :

Linear flow velocity, centimeters per hour

W :

Mass of adsorbent, grams

Z :

Column length, centimeters

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Acknowledgments

The authors gratefully acknowledge the financial support from Ministerio de Economía y Competitividad CTQ2011-27169, by CONSOLIDER Program through TRAGUA Network CSD2006-44, and Comunidad de Madrid through REMTAVARES Network S2009/AMB-1588. Also, the authors would like to thank TOLSA, S.A., for providing the sepiolite.

Author information

Correspondence to Juan García.

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Sotelo, J.L., Ovejero, G., Rodríguez, A. et al. Study of Natural Clay Adsorbent Sepiolite for the Removal of Caffeine from Aqueous Solutions: Batch and Fixed-Bed Column Operation. Water Air Soil Pollut 224, 1466 (2013). https://doi.org/10.1007/s11270-013-1466-8

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Keywords

  • Adsorption
  • Caffeine
  • Emerging contaminant
  • Fixed-bed
  • Sepiolite