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Separation characteristics of some phenoxy herbicides from aqueous solution

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Abstract

The adsorption and desorption characteristics of some phenoxy herbicides (CPA 2,4-D, and MCPA) from an aqueous solution on the active carbon materials (GAC, F-400) were studied. Adsorption equilibrium capacities of the phenoxy herbicides increased with a decrease in pH of the solution. Adsorption equilibrium isotherms were represented by the Sips equation. Kinetic parameters were measured in a batch adsorber to analyze the adsorption rates of the phenoxy herbicides. The internal diffusion coefficients were determined by comparing the experimental concentration curves with those predicted from the surface diffusion model and the pore diffusion model. The adsorption model based on the linear driving force approximation (LDFA) was used to simulate the adsorption behavior of the phenoxy herbicides in a fixed bed adsorber. Over 95 percent desorption of the phenoxy herbicides was obtained using distilled water.

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Abbreviations

A s :

surface area of the adsorbent particles, m2

b :

isotherm parameter, m3/mol

c :

equilibrium concentration of the solution, mol/m3

c o :

initial liquid phase concentration, mol/m3

c i :

initial concentration of bulk fluid, mol/m3

c s :

concentration on the surface of adsorbent, mol/m3

D e,p :

effective diffusion coefficient, m2/sec

D L :

axial dispersion coefficient, m2/sec

D m :

molecular diffusion coefficient, m2/sec

d p :

particle diameter, m

D p :

effective pore diffusion coefficient, m2/sec

D s :

effective surface diffusion coefficient, m2/sec

k :

isotherm parameter, [mol/kg][mol/m3]−1/n

k f :

film mass transfer coefficient, m/sec

M :

total mass of sorbent particle, kg

n :

isotherm parameter, –

N A :

rate of mass transfer of adsobates to the external surface of the adsorbent, mol/s

q m :

maximum adsorption capacity of adsorbent, mol/kg

q o :

initial adsorbed phase adsorbate concentration, mol/kg

r :

radial distance, m

R p :

particle radius, m

t :

time, sec, hr

V :

volume of solution, m3

v :

interstitial velocity, m/s

W :

weight of adsorbent, kg

ρ p :

particle density, kg/m3

ε b :

bed porosity

ε p :

particle porosity

τ p :

tortuosity factor

Bi:

Biot number

GAC:

granular activated carbon

PDM:

pore diffusion model

Re:

Reynolds number

Sc:

Schmidt number

SDM:

surface diffusion model

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Authors and Affiliations

  1. Department of Environmental Engineering, Chonnam National University, Gwangju, 500-757, Korea

    Tae-Young Kim, Seung-Sik Park & Sung-Yong Cho

  2. Department of Environmental Engineering, Environmental Research Institute, Chonnam National University, Gwangju, 500-757, Korea

    Seung-Jai Kim

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  1. Tae-Young Kim
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  2. Seung-Sik Park
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Correspondence to Sung-Yong Cho.

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Kim, TY., Park, SS., Kim, SJ. et al. Separation characteristics of some phenoxy herbicides from aqueous solution. Adsorption 14, 611–619 (2008). https://doi.org/10.1007/s10450-008-9129-6

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  • DOI: https://doi.org/10.1007/s10450-008-9129-6

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