Chinese Journal of Chemical Engineering, Vol.28, No.1, 46-53, 2020
Highly efficient [C(8)mim][Cl] ionic liquid accompanied with magnetite nanoparticles and different salts for interfacial tension reduction
The 1-octyl-3-methylimidazolium chloride, [C(8)mim][Cl] ionic liquid (IL) was used as a novel surfactant in n-heptane/water system. The interfacial tensions (IFT) were measured and corresponding variations were investigated. An IFT reduction of 80.8% was appropriate under the IL CMC of about 0.1 mol.L-1 and stronger effects were achieved when magnetite nanopartides and salts were present profoundly under alkaline pHs. The equilibrium IFT data were accurately simulated with the Frumkin adsorption model. Hereafter, the saturated surface concentration, equilibrium constant and interaction parameter were obtained and their variations were demonstrated. Further, emulsion stability and contact angle of oil/water interface over quartz surface were studied. The oil/water emulsion stability was hardly changed with nanopartides; however, the stability of oil/ water + IL emulsions was significantly improved. It was also revealed that the presence of sodium and calcium chloride electrolytes fortifies the IL impact, whereas sodium sulfate weakens. From dynamic ITT data and fitting with kinetic models, it was found that the IL migration toward interface follows the mixed diffusion-kinetic control model. Consequently, the IL diffusion coefficient and the appropriate activation energy were determined. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.