Abstract
Using previously presented magnetic inorganic/organic magnetic nanocomposites, the adsorption of two known commercial-available pesticides (active ingredients deltamethrin and thiamethoxam, respectively) was achieved. The differences in adsorption observed can be explained by the reduced affinity of the nitro group in the ionized form from thiamethoxam towards the carboxyl groups from chitosan. From the kinetics studies it was determined that in case of thiamethoxam adsorption process is exothermic in nature, while in the case of deltamethrin the process is endothermic. The Sips isotherm was more suitable to describe the adsorption of pesticides on prepared adsorbents. The maximum adsorption capacity determined for the developed material was 247.12 mg/g (for deltamethrin) and 53.29 mg/g (for thiamethoxam).
Highlights
Using previously presented magnetic inorganic/organic magnetic nanocomposites, the adsorption of two known commercial-available pesticides was achieved
To determine the adsorption rate of thiamethoxam and deltamethrin on the prepared adsorbent three kinetic models such as Lagergren-first-order, pseudo-second-order kinetic models and intra-particle mass transfer diffusion model were applied in order to get insight on the adsorption process dynamics
The adsorption isotherm experimental data of pesticides were fitted by three common adsorption models: Langmuir, Freundlich and Sips [12]
Summary
Using previously presented magnetic inorganic/organic magnetic nanocomposites, the adsorption of two known commercial-available pesticides (active ingredients deltamethrin and thiamethoxam, respectively) was achieved. 0.02 g of adsorbent materials and mixing with 20 mL of pesticide solution (at a concentration of 200 mg/L) into glass tubes. For the evaluation of the adsorption equilibrium, 0.02 g of adsorbent and mixed with 20 mL pesticide solution (concentrations ranging from 10 to 200 mg/L) into glass tubes for 10 h in order to reach adsorption equilibrium.
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