Removal of carbaryl residues from sesame and mint oil using nano-metal organic framework

Abstract

Essential oils were used as anti inflammation, anti respiratory diseases, and anti infections, however, essential oils suffering from high amount of pesticide residues. This paper is an overview on possible methods used for the removal of pesticide residues from essential oils. Metal organic framework based calcium (Ca-MOFs) was chemically modified to be used directly in adsorption of carbaryl from contaminated oil. The carbaryl removal process from mint oil and sesame oil were investigated in details to reach the optimized conations of removal process. The capacity of equilibrium adsorption for carbaryl compounds from mint oil was 161.37 mg g−1, and the capacity was decreased in the case of sesame oil (121.41 mg g−1). Langmuir and Freundlich isotherm models were applied to understand the mechanism of carbaryl adsorption. Langmuir model showed the best fitting isotherm (R2 = 0.999). The mechanism of carbaryl removal from essential oil was depending on pi-pi stacking technique. Finally, the modified Ca-MOFs were best candidate for selective removal of carbaryl from essential oil without loss of oil characteristics as confirmed using GC and FTIR spectroscopy.