Separation of manganese from aqueous solution using an emulsion liquid membrane

Abstract

The present study deals with the carrier-facilitated transport of manganese from this acidic leach solution in the ELM system. The ELM consists of MDEHPA as the extractant, industrial solvent as the inert diluent; non-ionic polyethylene glycol as a surfactant and sulfuric acid as the stripping solution. The main parameters influential affecting the ELM stability and extraction of manganese are the pH of the acidic leach solution, mixing speed, concentration of the stripping solution, extractant and surfactant, phase ratio and treatment ratio. With respect to the parameters mentioned, the optimum conditions for the process were determined. The results demonstrated the possibility of 93% extraction of manganese by ELM from the acidic leach solutions at optimum operational conditions.

Sustainable Recovery of Silver from Deactivated Catalysts Using a Novel Process Combining Leaching and Emulsion Liquid Membrane Techniques

“…The extraction efficiency was decreased surprisingly by further increasing the surfactant concentration to 7%. Excessive surfactant increases the mass transfer resistance at the membrane/external phase interfaces caused by high surfactant occupancy and high interfacial viscosity. ,, Therefore, a decrease in movement of inner droplets in the emulsion globules resulted in low silver ions extraction at the interface. ,, Considering ELM stability and extraction efficiency, the surfactant concentration of 6% was used.…”

“…Emulsion breakage results in transfer of the H ions from the internal phase to the external phase, so enhancement of the external phase acidity reveals the emulsion breakage. This method was used to optimally determine the emulsification time and stirring that maximize the ELM stability, quantified by the breakage ratio ( B ) of the emulsion: , where [H + ] i,0 is the initial concentration of H + ions in the internal phase, [H + ] e,0 is the initial concentration of total H + ions in the external phase, [H + ] e, t is the concentration of H + ions in the external phase at a time instant t , and V e and V i are the volumes of the external and the internal phases, respectively.…”

“…In recent years, the membrane technology has been investigated as an alternative that is more environmentally friendly, more efficient, and less expensive in terms of operating and capital costs than solvent extraction. − Liquid surfactant membranes, also called emulsion liquid membranes (ELMs), are a special type of liquid membranes based on liquid surfactants. The ELM technique is single stage, does not approach a thermodynamic equilibrium, is easy to operate (has a continuous operation), has a high selectivity, has a high metal transport flux from a low to a high concentration of the metal, and requires a small amount of a carrier. , It allows for transferring efficiently metal ions from an external aqueous phase to an organic membrane phase, and then from the membrane phase to a stripping phase. It involves the emulsification of an internal liquid phase in an immiscible liquid (membrane) and then the dispersion of the resulting emulsion in a third liquid called the feed (external) phase.…”

Investigation of experimental results and D-optimal design of hafnium ion extraction from aqueous system using emulsion liquid membrane technique

“…Another effective parameter on the emulsion stability is the concentration of the internal phase (stripping) [66]. Figure 5 shows the effect of internal phase concentration on emulsion stability.…”

Feasibility of hard acid–base affinity for the pronounced adsorption capacity of manganese(ii) using amino-functionalized graphene oxide

“…1 Although, it is an essential nutrient element in living systems that is found most oen in the +2 valence among various oxidation states, elevated levels of Mn content can result in toxic neurological effects. 2 There are many neurotoxic effects that cause a series of symptoms, such as adynamia, reduced coordination, masklike face, gait changes, sleep disturbances, muscular pain, hallucinations, and mental irritability, nally leading to a manganese-induced Parkinson like disease, called manganism. 3 Therefore, it is necessary to remove Mn ion contaminants from wastewater before release into the environment.…”