Abstract
Diazinon and chlorpyrifos are two common organophosphorus poisons to fight the pests in Iran. The removal of these poisons from water by thermosensitive nanosphere polymer (TNP), synthesized from the copolymerization of N-isopropylacrylamide and 3-allyloxy-1,2-propanediol, was investigated. The effect of pH, contact time, and the initial concentration on the removal amount was studied. The highest removal amount of these poisons by TNP occurred at pH 7. The contact time increase improves the removal amount and the equilibrium contact time for diazinon and chlorpyrifos was 10 and 18 min, respectively. For low concentration of less than 50 mgL−1it was shown that removal capacity remains above 95%. The initial concentration above 50 mgL−1decreased the removal amount, in which chlorpyrifos showed a greater decrease. The kinetic data has been checked using pseudo first-order, pseudo second-order, and intraparticle diffusion equations. The intraparticle diffusion model had the best conformability for the adsorption process.
Highlights
Today, due to the growing number of population and the lack of natural resources, an increase in the agricultural products along with their better qualitative conditions seems really integral
The study of elemental analysis results proved the presence of one unit of APD for every two units of NIPAM in each copolymer chain unit
This paper focuses on and compares the removals of two organophosphorus poisons, diazinon and chlorpyrifos, from water by synthesized copolymer
Summary
Due to the growing number of population and the lack of natural resources, an increase in the agricultural products along with their better qualitative conditions seems really integral. According to the yearly report by Agricultural Jihad Organization of Guilan province, diazinon and chlorpyrifos are the most commonly used poisons of organophosphorus classification [4] This is why they were considered in this study. N-isopropylacrylamide (NIPAM) is the commonest whose chemical structure includes amide and isopropyl belonging to hydrophilic and hydrophobic groups, respectively This polymer has LCST around 32∘C [46, 47]. Among all the thermosensitive copolymers and according to the previous work, the polymerization of NIPAM with 3-allyloxy-1,2-propanediol (APD) was introduced as an absorbent to adsorb and remove diazinon pesticide from water. This absorbent successfully removed a high percentage of diazinon poison from water. The kinetic parameters of these poisons’ adsorption process were determined and compared with each other
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