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Abstract
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In this study, the modified 13X zeolite by copper nanoparticles (copper nanoparticles were coated
on a bed of 13X), was used as an adsorbent for adsorption of fenitrothion from aqueous solutions
in a batch process. The results indicated that the maximum adsorption rate was 97% (with values
of 6, 0.2 g, 20 min, and 20°C for pH, adsorbent mass, contact time, and temperature respectively).
Kinetic studies showed that the pesticide adsorption process could be well described using the
pseudo-second-order (Type 1) kinetic model. Langmuir-Type 1 isotherm, as well, covers the equilibrium data with a maximum absorption capacity of 63.29 mg/g for modified 13X. The results of the
tests showed that the temperature increase has a negative effect on the removal efficiency. The thermodynamic parameters showed that the adsorption of fenitrothion pesticide on modified 13X in the
studied conditions was spontaneous and exothermic.
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