Pulverized river shellfish shells as a cheap adsorbent for removing of malathion from water: Examination of the isotherms, kinetics, thermodynamics and optimization of the experimental conditions by the response surface method
Introduction/purpose: In this study, we investigated the possibility of removing the organophosphorus pesticide malathion from water using a new adsorbent based on the biowaste of river shell shards from the Anodonta Sinadonta woodiane family, a material that accumulates in large quantities as w...
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| Autores principales: | , , , , , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
University of Defence in Belgrade
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/f2cd6c8620f94329b4cc0274e31f6cc7 |
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| Sumario: | Introduction/purpose: In this study, we investigated the possibility of
removing the organophosphorus pesticide malathion from water using a
new adsorbent based on the biowaste of river shell shards from the
Anodonta Sinadonta woodiane family, a material that accumulates in large
quantities as waste on the banks of large rivers. Two adsorbents were
tested - mechanically comminuted river shells (MRM) and
mechanosynthetic hydroxyapatite from comminuted river shells (RMHAp).
Methods: The obtained adsorbents were characterized and tested for the
removal of the organophosphorus pesticide malathion from water. In order
to predict the optimal adsorption conditions using the Response Surface
Method (RSM), the authors investigated the influence of variable factors
(adsorption conditions), pH values, adsorbent doses, contact times, and
temperatures on the adsorbent capacity.
Results: The best adsorption of malathion was achieved at mean pH
values between 6.0 and 7.0. The adsorption data for malathion at 25, 35,
and 45 °C were compared using the Langmuir, Freundlich, DubininRadushkevich (DR), and Temkin isothermal models, as well as pseudofirst order, pseudo-second order and Elovic kinetic models for modeling
adsorption kinetics. The maximum Langmuir adsorption capacity for MRM
and RMHAp at 25 °C was 46,462 mg g-1 and 78,311 mg g-1
, respectively.
Conclusion: The results have showed that malathion adsorption on both
adsorbents follows the pseudo-second kinetic model and the Freundlich
isothermal model. The thermodynamic parameters indicate the
endothermic, feasible, and spontaneous nature of the adsorption process. |
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