![]() ![]() In the year 2013 alone, Department of Environment Malaysia reported that a total of 103,994.37 metric tonnes of industrial waste containing heavy metals were generated from various industries in this country. reported on the dramatic increasing trend of heavy metal emission since the onset of industrial revolution. One of them is the emission of heavy metal with a great potential to pollute the environment. Introduction Rapid industrialization which begun in 1960s has raised many critical issues regarding environmental pollution. 98.6% of Cd(II) ions were successfully removed from the external aqueous phase at this condition.ġ. The best performance of ELM in extracting Cd(II) ions was recorded at speed of 300 rpm for 15 min. The influence of stirring speed and extraction time on the solute removal efficiency was observed. The W/O emulsion was prepared using 0.1M NaOH as the internal phase while the membrane phase consist of 3 wt% Span 80 and Aliquat 336, dissolved in corn oil. The analysis showed that Aliquat 336 is highly selective towards Cd(II) as it able to remove almost all Cd(II) ions from the aqueous solution while Span 80 has assisted in the formation of a stable emulsion. ![]() It is learned that corn oil showed a promising results to be incorporated in ELM to dissolve Span 80 and Aliquat 336 as surfactant and carrier in the membrane phase, respectively. A compatibility study was conducted to investigate its feasibility to be used as diluent in ELM. Vegetable oil tested in this study are sunflower, corn and palm oil. The result of this research showed that liquid-liquid extraction gave more optimum separation of Co and Ni metals rather than the emulsion liquid membrane extraction.In this work, the potentialities of vegetable oil to be incorporated as diluent in Emulsion Liquid Membrane (ELM) formulation was explored. While liquid-liquid extraction gave the optimum extraction at pH 4 with extractant concentration was 0.6 M with Co and Ni metals extracted 42.64% and 34.73%. The optimum extraction of Co and Ni metals using emulsion liquid membrane was obtained at pH 6 with Co and Ni metals extracted 47.09% and 29.49%. The liquid-liquid extraction process was then employed by varying the pH of the aquatic solution and the extractant concentration in order to obtain optimum separation of Co and Ni metals. In emulsion liquid membrane extraction, the metals from aqueous solution was extracted using 0.7 M Cyanex 272 in kerosene solvent, 10% w/v SPAN 80 as surfactant and 0.1 M H 2SO 4 as stripping agent by varying the pH of the aquatic solution. In this research, the aqueous solution contains Co and Ni metals, both respectively 4533 mg/L and 945 mg/L. Cyanex 272 is an acidic extractant that was used in this research and the extraction of Co and Ni metal take place through cation exchange mechanisms. In the emulsion liquid membrane extraction, pH of aqueous phase solution (4-6) was varied and in the liquid-liquid extraction, pH of aqueous solution (2-8) and extractant concentration (0.6-1.2 M) were varied. ![]() The methods to separate Co and Ni metals from the leaching solution was done in this research by using emulsion liquid membrane extraction and liquid-liquid extraction. However, the use of leaching method produces solutions containing a variety of metals, such as cobalt (Co) and nickel (Ni). Metals from spent lithium ion batteries are generally taken by using leaching method. ![]()
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