Abstract
Background: Di- (2-ethyhexyl phosphoric acid), commonly known as D2EHPA, is an important extractant used for the recovery of Zn (II) from aqueous waste. The D2EHPA extractant encapsulated polymeric beads (EEPBs) were synthesized and investigated for the sorption of Zn (II) from aqueous medium.
Objective: Synthesis of D2EHPA impregnated polymeric beads for the extraction of Zinc from zincrich waste liquor.
Method: The beads were prepared by the phase inversion technique.
Results: The amount of Zn (II) extracted was found to increase with contact time, beads weight and concentration of solution. The kinetics measurement showed that about 250 min of equilibration time was enough to remove saturation amount of Zn (II) from the solution. The sorption kinetics data fitted well in the pseudo second order model and sorption results were found to follow Langmuir sorption isotherm model. Stripping investigations carried out using different stripping agents indicated that 2M HCl is effective for stripping the Zn (II) loaded onto the synthesized beads.
Conclusion: The maximum experimental capacity of the D2EHPA encapsulated beads was found to be 33.8 mg g-1 for Zn (II). The synthesized beads enabled the selective extraction of Zn (II) ions from a simulated complex waste matrix with good recyclability upto the studied 4 sorption and desorption cycles. The sorption capacity was found to be maximum at pH 5.0 and decreased significantly on either side of pH 5.0. These synthesized sorbent beads can be selectively and efficiently employed for the recovery of zinc from usual Zinc-rich waste liquor.
Keywords: D2EHPA, extractant-encapsulated beads, isotherm model, Langmuir sorption, waste liquor and Zn extraction.
Graphical Abstract
Call for Papers in Thematic Issues
Functional Conjugated Polymers and Sensor Applications
The term "conjugated polymer" refers to "conjugated polymers", which is a sub-branch of polymer science. Conjugated polymers are polymers formed by adding various functional groups (usually organic compounds) to one end of a polymer chain. These functional groups can change the properties of the polymer or cause certain changes in ...read more
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