Abstract
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.
Highlights
The development of technology undoubtedly contributes to the development of society; it causes environmental pollution
The usage of pesticides is intended to combat animals and plants that are harmful to crops, enabling increased yields and ensuring the sustainability of Veličković, Z. et al, Pulverized river shellfish shells as a cheap adsorbent for removing of malathion from water: examination of the isotherms, kinetics, thermodynamics ..., pp.871-904 the human population
The shell powder was washed in vacuo with deionized water, ethyl alcohol and dried in vacuo for 24 h at 110 oC to give the first MRM adsorbent
Summary
The development of technology undoubtedly contributes to the development of society; it causes environmental pollution. A distinct surge in the world’s population and an increase in food needs condition the development of intensive agricultural production based on the use of inputs to overcome factors that limit production such as insects, fungi, weeds, and land scarcity (Kamga, 2019). Due to its potential danger to health by entering the food chain for humans and animals, pesticide pollution has reached alarming proportions. Pesticides are ecologically very important because of their high toxicity to living organisms, including humans; the toxicological profile of this pollutant poses a potential risk to the environment and public health (Kamga, 2019). Many insecticides such as DDT, deildrin, heptachlor, and aldrin bioaccumulate in blood, milk, and tissues and are found in food products (Singh et al, 2010)
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