Characteristics and Mechanism of Cu(II) Extraction with Polymeric Particles with Interconnected Spherical Pores Impregnated with LIX84-I

Preparation of Hydrophobic Cryogel Containing Hydroxyoxime Extractant and Its Extraction Properties of Cu(Ⅱ)

“…This equilibrium reaction between Cu(II) and LIX84-I in the cryogels is same as that in the polymer particles with inter-connected spherical pores impregnating LIX84-I [48] In all conditions, the extraction behavior of Cu(II) into the hydrophobic cryogels conformed well to Langmuir-type adsorption as shown in Equation ( 1).…”

“…This equilibrium reaction between Cu(II) and LIX84-I in the cryogels is same as that in the polymer particles with inter-connected spherical pores impregnating LIX84-I [48] and that in PVA/Alg cross-linked gel microcapsules immobilized fine droplets of LIX84-I [53].…”

“…The relationship between the molar content of LIX84-I per gram of the polymeric particles, E*, and the maximum molar amount of Cu(II) extracted into the polymeric particles, Q max , gave a straight line with a slope of 1/2 when considering that the purity of LIX84-I is 52.4 wt% [48] as shown in Figure 8. It is assumed that two molecules of LIX84-I react with each Cu(II) ion.…”

“…In contrast, hydrophilic crosslinked gels encapsulating fine droplets of LIX84-I and commercial microporous particles impregnated with LIX84-I resulted in slower extraction, requiring several hours or more to become constant concentration of Cu(II) [49,53]. This hydrophobic cryogel containing LIX84-I, which has a similar structure to the LIX-84-I impregnated polymeric particles with cross-linked spherical pores [47,48], has a high specific surface area, and at the outermost surface of the cryogel, hydrophobic chains of the extractant are inserted into the hydrophobic polymer chain network that makes the cryogel walls and hydrophilic binding sites that interact with Cu(II) are exposed on the surface. This configuration is believed to contribute to an accelerated extraction rate.…”

“…An extractant is a specialized functional molecule that selectively interacts with and extracts metal ions in the solvent extraction method from an aqueous solution. The porous microcapsules and porous polymer particles interconnect with spherical pores on the surface and their inside, which are prepared using W/O/W emulsions as a template [7,[46][47][48]. It has been found that by using microcapsules or microparticles with interconnected spherical pores, the aqueous phase moves quickly into the microparticles, and the extraction rate of metals is very fast [49].…”