(377m) High Vying Ti3C2Tx Mxene Nanosheets with Mehpa to Release Mercury from a Loaded Oil Phase | AIChE

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(377m) High Vying Ti3C2Tx Mxene Nanosheets with Mehpa to Release Mercury from a Loaded Oil Phase

Authors 

Laki, S. - Presenter, Drexel University
Arabi Shamsabadi, A., Drexel University
Alimohammadi, F., Temple University
Anasori, B., Drexel University
Soroush, M., Drexel University
Solvent extraction is a method of selectively removing metal ions present in very low concentration in an aqueous medium. In recent years there has been an increased interest in using the technique in wastewater treatment1-4. Because metals are usually not soluble in organic solvents, the process requires the introduction of an extractant that will combine with the metal ion to form an organic soluble complex. The loaded solvent is then stripped with a suitable acidic aqueous phase, and the metal is transferred from the oil phase to the desired aqueous solution or stripping phase. The advent of nanotechnology has provided a great opportunity for the invention of desired nanomaterials with large surface-to-volume ratios and unique functionalities to treat pollutants. Nanomaterials now play a key role in environmental remediation and are used for the treatment of natural waters, sediments, soils, and industrial and domestic waste water5-9. Two-dimensional (2D) nanomaterials have been found to be efficient adsorbents for heavy metals10-12. Their abundant active sites, negative zeta potential, excellent dispersity in water, and large surface areas have made them ideal adsorbents for environment remediation11-23. The appealing features of 2D nanomaterials have motivated us to use them as oil-phase strippers in solvent extraction. Sorption of mercury removal from aqueous solutions has been studied by many researchers24-27. However, heavy metals stripping from an oil phase has not been reported yet.

In this paper, we present results from our study of mercury stripping from a loaded oil phase. First, we conducted solvent extraction studies to transfer mercury ions from drinking water to an organic phase (kerosene) by using di(2-ethylhexyl) phosphoric ethyl hexyl) phosphoric acid (MEHPA) as the extractant. We determined the mechanism for the formation of MEHPA-Hg complex by assuming a thermodynamically ideal extraction system and using the Ritcey and Ashbrook model28-29. We then used different 2D nanomaterial suspensions like GO, MoS2, MnO2 and Ti3C2Tx MXene as stripping reagents. The 2D material suspensions were added to a mixture of the loaded organic phase (kerosene containing MEHPA–Hg complex) obtained from solvent extraction. The effects of the parameters such as pH, the contact time, concentrations of extractant and 2D nanomaterial, and temperature were investigated. The equilibrium stripping data were evaluated using the Langmuir isotherm model.

Keywords: Mercury, 2D Nanomaterials, Wastewater Treatment, MXene, Stripping Reagent

References

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