Abstract
Adsorption of phenols from aqueous solutions onto a polymeric sorbent, SP206, was carried out in a finite batch adsorber. Multicomponent adsorption equilibrium data were experimentally measured and compared with those predicted by the ideal adsorbed solution theory (IAST) based on the Langmuir equation as single species isotherms. Intraparticle diffusion during adsorption was assumed to be expressed by the pore diffusion and the surface diffusion mechanisms and the effective diffusion coefficient of each species was determined by comparing experimental and predicted concentration histories. The surface diffusion model incorporated with the IAST successfully simulated the adsorption behaviour of a phenols-polymeric sorbent system up to three-species mixtures. The regeneration of spent sorbents was also investigated to get information for a cyclic adsorption process.
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Abbreviations
- A:
-
surface area of sorbent particles
- b:
-
Langmuir constant
- C:
-
concentration in the liquid phase [mol/m3]
- Dm :
-
molecular diffusivity [m2/sec]
- Dp :
-
effective pore diffusion coefficient [m2sec]
- Ds :
-
effective surface diffusion coefficient [m2/s]
- E:
-
mean percent deviation defined in Eq. (24)
- kj :
-
film mass transfer coefficient [m/s]
- k:
-
Freundlich coefficients in Eq. (22)
- m:
-
number of species
- N:
-
number of data points
- n:
-
exponent in Eqs. (22) and (23)
- Q:
-
amount adsorbed [mol/kg]
- Qm :
-
amount adsorbed for monolayer formation [mol/kg]
- R:
-
gas constant and radius of particle [m]
- r:
-
radial distance [m]
- T:
-
temperature
- t:
-
time [s or hr]
- V:
-
volume of solution [m3]
- W:
-
weight of sorbents [kg]
- X:
-
dimensionless radial distance ( = r/R)
- Z:
-
mole fraction in the adsorbed phase
- α:
-
dimensionless group defined in Eq. (11)
- γi :
-
dimensionless group defined in Eq. (20)
- ε p :
-
particle porosity
- λ:
-
dimensionless group defined in Eq. (21)
- ξi :
-
normalized concentration ( = Ci/C10)
- ρ p :
-
apparent particle density, kg/m1
- π:
-
spreading pressure
- π:
-
modified spreading pressure defined in Eq (7)
- τ:
-
dimensionless time ( = Ds1t/R2)
- ψi :
-
dimensionless amount adsorbed ( = Qi/Q10)
- exp:
-
measured value
- pre:
-
calculated value
- IAST:
-
ideal adsorbed solution theory
- PCP:
-
p-chloruphenol
- PNP:
-
p-nitrophenol
- 0:
-
initial value
- i, j:
-
subscripts for species
- o:
-
single-species state
- p:
-
particle
- s:
-
surface
- T:
-
total
- —:
-
average
- *:
-
equilibrium
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Moon, H., Kook, S.K. & Park, H.C. Adsorption of phenols onto a polymeric sorbent. Korean J. Chem. Eng. 8, 168–176 (1991). https://doi.org/10.1007/BF02706679
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DOI: https://doi.org/10.1007/BF02706679