Performance of sunflower oil as green solvent for Cr(VI) extraction using supported liquid membrane

Abstract

a b s t r ac tThis work is an experimental study on the extraction of Cr(VI) ions from aqueous acidic solutions using a flat sheet supported liquid membrane. Sunflower oil used as alternative solvent due to the stricter environmental regulations. Aliquat 336 and NaOH solution were employed as carrier and stripping agent. A hydrophobic microporous polytetrafluoroethylene (PTFE) support was impregnated with liquid membrane consist of solvent and carrier. The Cr(VI) pass through the supported liquid membrane from aqueous feed phase to the stripping phase by means of diffusion. Hydrochloric acid (HCl) was used to regulate the feed phase pH. The efficiency of the extraction was optimized as a function of the various parameters: Feed pH, stripping phase (NaOH) concentration, feed concentration, and carrier concentration. The maximum separation of Cr(VI) was about 95.2% in 10 h. Also, the results of experiments were compared with other organic solvents such as kerosene, n-octanol, dodecane, and tetrahydrofurane (THF) to evaluate the efficiency of sunflower oil. Results indicated that Cr(VI) extraction is on average about 0.5%-55% higher with sunflower oil. The optimum conditions were achieved as: pH = 2, NaOH = 0.1 M, feed concentration = 25 ppm, and Aliquat 336 = 35% v/v. The results indicate that the Cr(VI) ions can be efficiently transported through the SLM by using Aliquat 336 dissolved in sunflower oil as a green solvent.

Effect of Flower‐Like and Spherical Nanostructured MoS2 on the Adsorption Properties of Cr(VI) Ions

“…So, it is very urgent to deal with the pollution of Cr(VI). Until now, the removal methods of Cr(VI) were also various, including chemical precipitation, ion exchange, membrane filtration, solvent extraction, coagulation, and adsorption, etc . Among these methods, adsorption technology has advantages of its simple operation and wide availability, which is generally considered the most effective and economical …”

Application of Poly(Ethyl Eugenyl Oxyacetate) Compounds as the Ions Carrier for Heavy Metals Separation and Separation of Fe and Ni in Ferronickel Using Liquid Membrane Transport Method

“…Further addition of PEEOA volume even increases the thickness (viscosity) and the obstacle of the membrane. Thus, the transport percent of metal ions can decrease due to reducing ion activities at the membrane interface [10,13].…”

One-Step Fabrication of Recyclable Konjac Glucomannan-Based Magnetic Nanoparticles for Highly Efficient Cr(VI) Adsorption

“…Therefore, it is very urgent to deal with the problem of Cr(VI) contamination. Until now, a variety of methods have been used to treat Cr(VI) contamination, for example, chemical precipitation [7], ion exchange [8,9], membrane filtration [10], solvent extraction, coagulation and adsorption [11,12]. Among these methods, adsorption technology is more economical than membrane filtration is, easier to operate than coagulation/precipitation is, and more versatile than ion exchange is, which is considered as the most practical technology [13][14][15][16].…”