Investigation of the kinetics of imidacloprid adsorption onto bimetallic Cu-BTC MOF.

[Display omitted] • A novel porous Ag@Cu-BTC IPA composite was synthesized by modifying Cu-BTC with isopropyl alcohol and silver. • Imidacloprid was adsorbed onto Cu-BTC, Cu-BTC IPA and Ag@Cu-BTC IPA . • Maximum adsorption attained by Ag@Cu-BTC IPA at pH 7 was 83.6%. • Kinetic studies for adsorption and release were performed. Imidacloprid, which is harmful for humans as well as many other aquatic invertebrate species, is extensively present in water worldwide. Hydrophobic Cu-BTC IPA and a novel composite, Ag@Cu-BTC IPA , was synthesized for adsorption of imidacloprid from water. The synthesis of the composite and the increase in surface area and pore volume were confirmed by FTIR, XRD, SEM, and BET analysis. A comparative study of the adsorption efficiencies of the synthesized composites was performed. The maximum adsorption efficiency achieved was 83.6 % at pH 7 by the Ag@Cu-BTC IPA composite. Kinetic and isotherm analyses suggested multilayer chemisorption involving p-p conjugation and pore-filling mechanisms. Intra-particle diffusion was the rate limiting step. Release studies of imidacloprid from water showed that the percentage release amount was 90.2 % at 70 min. Kinetic analysis of the release process suggested release through chemisorption, with swelling-controlled release from the dosage form, corresponding to the super case II transport mechanism. [ABSTRACT FROM AUTHOR]