Polymeric‐hydrogel‐coated iron oxide magnetic particles for efficient solvent dehydration

Abstract

In this article, we report the synthesis of crosslinked polyacrylamide-hydrogel-coated iron oxide (Fe 3 O 4 -PAM) magnetic nanoparticles as a kind of novel and efficient solvent-dehydrating agent. With the use of commercially available toluene (containing trace water at 168-173 ppm) as a model organic solvent, an excellent dehydration performance of Fe 3 O 4 -PAM was observed; trace water as low as 48 ppm was efficiently removed, and this desiccant could compete with respect to the dehydration efficiency with common sodium treatments. To our knowledge, this is the first example of the application of such water-swollen hydrogel-coated Fe 3 O 4 magnetic nanoparticles for the efficient removal of trace water in solvents. Also, the Fe 3 O 4 -PAM magnetic nanoparticles could be easily separated from the solvents after the dehydration treatment; thus, they possess a great advantage over traditional organic solvent dry methods and may find a variety of applications, for example, in oil dehydration and organic solvent drying.

Multi‐functional magnetic hydrogel: Design strategies and applications

“…[46] When pH = 4.5, the maximum adsorption capacity of nano-beads for bovine serum albumin was the highest, reaching 127.3 mg⋅g −1 . In addition to the above applications, the absorbability of MHs could also be used for enzyme immobilization, [47] dehydrators, [48] data storage, [49] moisture transport, [50] and so on.…”

Entrapment in Hydril Gels: Hydro-Ionic Liquid Polymer Gels for Enzyme Immobilization

“…No examples of poly (acrylamide)-based hydrogels or IL gel shrinking in toluene were found in the literature. In fact, analogous hydrogels have been used to dehydrate commercial toluene [105], therefore showing the opposite behaviour observed in HydrIL gels. This illustrates the change in the nature of the internal environment of the HydrIL gel relative to unmodified hydrogels.…”