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Journal of Environmental Science and Health, Part B
Pesticides, Food Contaminants, and Agricultural Wastes
Volume 51, 2016 - Issue 3
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ARTICLES

Kinetic and isotherm error optimization studies for adsorption of atrazine and imidacloprid on bark of Eucalyptus tereticornis L.

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Pages 192-203 | Received 23 Jul 2015, Published online: 16 Dec 2015
 

ABSTRACT

The aim of this study was to establish the bark of Eucalyptus tereticornis L. (EB) as a low cost bio-adsorbent for the removal of imidacloprid and atrazine from aqueous medium. The pseudo-first-order (PFO), pseudo-second-order (PSO), Elovich and intra-particle diffusion (IPD) models were used to describe the kinetic data and rate constants were evaluated. Adsorption data was analysed using ten 2-, 3- and 4-parameter models viz. Freundlich, Jovanovic, Langmuir, Temkin, Koble–Corrigan, Redlich–Peterson, Sips, Toth, Radke–Prausnitz, and Fritz-Schluender isotherms. Six error functions were used to compute the best fit single component isotherm parameters by nonlinear regression analysis. The results showed that the sorption of atrazine was better explained by PSO model, whereas the sorption of imidacloprid followed the PFO kinetic model. Isotherm model optimization analysis suggested that the Freundlich along with Koble–Corrigan, Toth and Fritz-Schluender were the best models to predict atrazine and imidacloprid adsorption onto EB. Error analysis suggested that minimization of chi-square (χ2) error function provided the best determination of optimum parameter sets for all the isotherms.

Acknowledgments

The authors are thankful to Mr. Bappa Das, Division of Agricultural Physics, Indian Agricultural Research Institute, New Delhi 110012, India, for his critical suggestions.

Nomenclature

Nomenclature
AFS=

Fritz–Schluender equilibrium constant (L mg−1)

aKC=

Koble–Corrigan parameter (Ln mg1-n g−1)

aR=

Redlich–Peterson model constant (mg L−1)−g

aRP=

Radke–Prausnitz model constant

aS=

Sips equilibrium constant (L mg−1)βs

AT=

Temkin isotherm equilibrium binding constant (L/mg)

bKC=

Koble–Corrigan parameter (L mg−1)n

bT=

Temkin isotherm constant

Cs=

adsorbate monolayer saturation concentration (mg L−1)

g=

Redlich–Peterson model exponent

KE=

Elovich equilibrium constant (L mg−1)

KF=

Freundlich isotherm constant (mg1-NF kg−1 LNF)

KJ=

Jovanovic isotherm constant (L mg−1)

KL=

Langmuir isotherm constant (L mg−1)

KRP=

Redlich–Peterson model isotherm constant (L mg−1)

KS=

Sips maximum adsorption capacity (mg kg−1)

KT=

Toth equilibrium constant

n=

number of data points

nF=

adsorption intensity

p=

number of fitted parameters

Q0=

monolayer coverage capacity (mg kg−1)

qe,avg=

average of the observed concentrations

qe,calc=

calculated adsorbate concentration at equilibrium (mg kg−1)

qe,meas=

measured adsorbate concentration at equilibrium (mg kg−1)

qm=

theoretical isotherm saturation capacity (mg kg−1)

qs=

theoretical isotherm saturation capacity (mg kg−1)

R=

universal gas constant (8.314 J mol−1K−1)

rR=

Radke–Prausnitz isotherm model constant

tT=

Toth model exponent

w=

weight factor

αFS=

Fritz–Schluender model exponent

βFS=

Fritz–Schluender model exponent

βR=

Radke–Prausnitz isotherm model exponent

βS=

Sips isotherm model exponent

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