Purification of soybean oil from diazinon insecticide by iron-based metal organic framework: Effect of geometrical shape and simulation study

Soybean oil is largely used in food industries and hence, its purification is highly recommended nowadays. In the present work, removal of diazinon insecticide from soybean oil was studied by using iron based metal organic frameworks (Fe-MOF). Two Fe-MOFs (MIL-101-NH2-Fe) different in geometrical shapes were felicitously prepared by using different metal precursors of ferric chloride and ferric nitrate. The micrographs showed that hexagonal spindle crystalline and semi-spherical crystals were obtained for Fe-MOF-1 (C24H15ClFe3N3O13) and Fe-MOF-2 (C24H15Fe3N3O13), respectively. The synthesized Fe-MOFs were applied in removal of diazinon from soybean oil. The pseudo-second order and Langmuir isothermal models were more suitable for investigating the adsorption equilibrium attitude. Owing to its higher surface area, Fe-MOF-2 showed significantly greater Langmuir removal capacity of 469.0 mg g(-1), than that of Fe-MOF-1 (356.8 mg g(-1)). Good recycling results were obtained and the removal capacity for Fe-MOF-2 was reduced from 321.4 mg/g to 270.1 mg/g after 5 recycles. The adsorption mechanism was explored by Monte Carlo simulation and declared that it can be linked to a combination of physical deposition and electrostatic reactions. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, iron-based metal organic frameworks (Fe-MOF) were successfully used for removing diazinon insecticide from soybean oil. Fe-MOF-2 showed a higher Langmuir removal capacity and better recycling results. The adsorption mechanism involved a combination of physical deposition and electrostatic reactions as explored by Monte Carlo simulation.