Thermodynamic and kinetics study of phosphonium-based cellulose acetate supported ionic liquid membrane: wastewater treatment

摘要

The widespread use of pesticides and insecticides for agricultural and nonagricultural purposes have resulted in the presence of their residues in different environmental compartments and remain serious concern for polluting water bodies after industrial revolution, late 1960s. In this research work, carcinogenic insecticide "Pirimicarb" has been remediated from wastewater using an adsorption process. Phosphonium-based ionic liquid [P(Cy)(3)][BF4(-)] (PIL) and cellulose acetate supported IL membrane ([CA-P(Cy)(3)][BF4](-))(CA-PIL) were synthesized and characterized as adsorbents for Pirimicarb removal. Results of Fourier-transform infrared spectroscopy and scanning electron microscopy confirmed successful preparation of PIL and then incorporation in CA structure. Various parameters (concentration, temperature, and adsorbent mass) were analyzed using ultra violet--visible spectroscopy under close batch mode of 200 min. Comparison of percentage removal between PIL and CA-PIL membrane revealed better adsorption trend by CA-PIL membrane (72%) as compared with the prepared PIL (55%). Thermodynamic studies by calculating Delta G, Delta H, and Delta S showed that the reaction is an endothermic physiochemical sorption process. Kinetic studies favored pseudo-second-order Langmuir, Freundlich, and Temkin isotherms.