مختصر البحث:
In the present study, the efciency of Nanoemulsion Liquid Membrane (NELM) in the recovery of cadmium, cobalt, and
nickel ions from real wastewater was investigated and optimized by response surface methodology (RSM). An ecofriendly approach using…
In the present study, the efciency of Nanoemulsion Liquid Membrane (NELM) in the recovery of cadmium, cobalt, and
nickel ions from real wastewater was investigated and optimized by response surface methodology (RSM). An ecofriendly approach using sunfower oil-based diluent and silica nanoparticles is a signifcant advancement over traditional
methods. The proposed NELM included a diluent composed of 70% sunfower oil and 30% kerosene, Bis-(2-Ethylhexyl)
Phosphate (D2EHPA) used as a carrier, span80 used as surfactant, Silica Nanoparticles (SNPs) as co-surfactant and HCl
as stripping agent. The SNPs were characterized using a scanning electron microscope (SEM), Transmission Electron
Microscope (TEM), and X-ray Difraction (XRD). The comparison between the experimentally optimized and the RSM
optimized values was accomplished by optimizing the following parameters SNPs concentration, carrier concentration,
pH of the external phase, surfactant concentration, and emulsifcation speed. The results of RSM showed that the best
conditions obtained from the extraction process were at SNPs and span80 concentration of 0.294%(w/v) and 3.62%(v/v),
respectively, pH of the external phase of 5.49, emulsifcation speed of 11,075 rpm, and carrier concentration of 5.55%(v/v)
at extraction time of 8 min. At these conditions, the maximum extraction of Cd+2, Co+2, and Ni+2 ions was 93.43%, 91.02%,
and 79.43%, respectively. Based on the fndings of the regression analysis, it was possible to ft the experimental data
to a quadratic model with R2
of 93.53%, 91.76%, and 92.5% for Cd+2, Co+2, and Ni+2 ions respectively. The mechanism
of the Cd+2, Co+2, and Ni+2 ions extraction was presented. Also, the study of reusability of the prepared membrane was
discussed and showed that a slight decrease in the activity of the membrane at the end of four cycles where extraction
efciency decreased from 90.57%, 87.31%, and 77.62% in the frst cycle to 80.14%, 75.83%, and 68.72% at the fourth
cycle for Cd+2, Co+2, and Ni+2 ions, respectively, confrming the good reusability of the membrane during the treatment
of wastewater. Finally, the prepared NELM can efectively be used for the treatment of wastewater contaminated with
heavy metals due to its high extraction efciency at a low required time
