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Norul Fatiha Mohamed Noah,Norela Jusoh,Norasikin Othman,Raja Norimie Raja Sulaiman,Nurul Asma Mohd Khairul Parker 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.66 No.-
This research addresses the development of stable green ELM process for chromium removal from industrial effluents where CrO42− and Cr2O72− is the predominant species. Types of carriers, diluents and stripping agents undergo screening via LLE process. Meanwhile, the parameters studied for ELM stability and extraction were surfactant and modifier concentrations, homogenizer speed and emulsifying time. The formulate condition of stable ELM process was 0.04 M TOMAC in palm oil, 0.05 M NaOH, 3% (w/v) Span 80, 5% (w/v) octanol, 10,000 rpm homogenizer speed and 3 min emulsifying time. At this condition, 97% of chromium was extracted with breakage rate of 10%.
Norela Jusoh,Norasikin Othman,Raja Norimie Raja Sulaiman,Norul Fatiha Mohamed Noah,Muhammad Abbas Ahmad Zaini 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
The emulsion liquid membrane (ELM) process for silver recovery containing synergistic Cyanex 302/Cyanex 272 carriers, palm oil as a diluent, acidic thiourea as a stripping agent, and sorbitan monooleate (Span 80) as a surfactant was attempted. A suitable range of mixed carrier concentration on the facilitated extraction performance of silver was first determined. Response surface methodology (RSM) was applied to optimize and evaluate the effect of mixed carrier concentration, stripping agent concentration, and treat ratio on the stability of the process. The results showed that the system was stable with no breakage or swelling. At the optimum condition of 8.26/12.39mM Cyanex 302/Cyanex 272, 1.27 M acidic thiourea, and 0.62 treat ratio, the silver extraction performance and recovery were 97% and 54% (4.33 times enrichment), respectively. Further modification of the process and addition of 5% w/v of modifier resulted in 6.57 times enrichment, which accounted for 82% of the silver recovery. Hence, this study shows the capability of silver recovery using a synergistic ELM process and potential to be applied in industrial effluent.