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Electrochemically assisted adsorption/desorption of bentazone on activated carbon cloth

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Abstract

This paper investigates the use of electrochemical techniques for the removal of a common herbicide, bentazone, from water streams using a carbon-based electrode. Activated carbon cloth with high surface area and narrow micropores was used as electrode. For a better understanding of the process, adsorption was investigated under both open circuit and controlled polarization conditions, the latter in anodic and cathodic directions. It was found that anodic polarization enhances the kinetics of adsorption of the herbicide on the carbon cloth, the extent of which is strongly related to the applied current value. At converse, cathodic polarization induces the reversible desorption of the compound. Moreover, in-situ UV spectra recording on the solution did not show any structural change of the herbicide upon polarization, demonstrating the reversibility of the process for the regeneration of the adsorbent and the recovery of the compound. Based on these experiments, a mechanism is proposed to interpret the reversible sorption of bentazone under polarization.

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Abbreviations

C:

solution concentration (mg L−1)

Co :

initial solution concentration (mg L−1)

DFT:

density functional theory

DR:

Dubinin-Radushkevich method

E:

equilibrium reduction potential (Volts)

I:

applied current (mA)

K ads :

adsorption rate constant (min−1)

NHE:

Normal Hydrogen Electrode

p:

pressure

p0 :

saturation pressure

pHPZC :

pH of the point of zero charge (pH units)

PSD:

pore size distribution

q:

amount of bentazone adsorbed (mg g−1)

qe :

amount of bentazone adsorbed at equilibrium (mg g−1)

S BET :

apparent specific surface area obtained from the nitrogen adsorption data at −196°C by the BET model (m2 g−1)

t:

time (min)

U:

working electrode potential (Volts)

VCO2 :

narrow micropores volume, obtained from the CO2 adsorption data at 0°C, by the DR method (cm3 g−1)

Vmeso :

mesopores volume, obtained from the nitrogen adsorption data at −196°C, by the DFT method (cm3 g−1)

Vmicro :

micropores volume, obtained from the nitrogen adsorption data at −196°C, by the DFT method (cm3 g−1)

VTOTAL :

total pore volume obtained from the nitrogen adsorption data at −196°C, and evaluated at p/p0∼0.95 (cm3 g−1)

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Author notes

  1. C. O. Ania

    Present address: Instituto Nacional del Carbón, CSIC, Apdo. 73, 33080, Oviedo, Spain

Authors and Affiliations

  1. CRMD, CNRS-University, 1B rue de la Férollerie, 45071, Orléans, France

    C. O. Ania & F. Béguin

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  1. C. O. Ania
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  2. F. Béguin
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Correspondence to C. O. Ania.

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Ania, C.O., Béguin, F. Electrochemically assisted adsorption/desorption of bentazone on activated carbon cloth. Adsorption 13, 579–586 (2007). https://doi.org/10.1007/s10450-007-9024-6

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  • DOI: https://doi.org/10.1007/s10450-007-9024-6

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