Ionic liquid-modified silica-coated magnetic nanoparticles; promising anion-exchange sorbent for extraction of Cr(VI)

Characterization of a recombinant Aspergillus niger GZUF36 lipase immobilized by ionic liquid modification strategy

“…Fe 3 O 4 @SiO 2 @ILs were prepared according to the procedures outlined by Latifeh et al ( 2016 ) and Yamini et al ( 2017 ) with minor adjustments and involved four well-defined steps. First, Fe 3 O 4 was coated with silica.…”

Fe3O4–SiO2–graphene oxide–amino acid ionic liquid magnetic solid-phase extraction combined with inductively coupled plasma optical emission spectrometry for speciation of Cr(iii) and Cr(vi) in environmental water

“…31 So far, mainly five types of functionalized magnetic NMs have been applied for their selectivity towards particular Cr species, including amino functionalization, 21 carboxylic functionalization, 32 metal oxide functionalization, 33 graphene oxide functionalization, 34 and ionic liquid (IL) functionalization. 17,35,36 ILs are organic salts with unique chemical and physical properties, such as good stability, a low melting point and environmentally friendliness, 37,38 that have been used to modify the Fe 3 O 4 @SiO 2 magnetic core. For example, a methylimidazolium hexafluorophosphate ([mim][PF 6 ]) functionalized magnetic sorbent selectively adsorbed Cr(VI) at pH 5.5 through anionic exchange, 35 and 1-hexadecyl-3-methylimidazolium bromide ([C 16 mim][Br])-coated magnetic NMs adsorbed a Cr(VI) chelate with 9-phenyl-2,3,7-trihydroxy-6-fluorone at pH 5.0.…”

“…17,35,36 ILs are organic salts with unique chemical and physical properties, such as good stability, a low melting point and environmentally friendliness, 37,38 that have been used to modify the Fe 3 O 4 @SiO 2 magnetic core. For example, a methylimidazolium hexafluorophosphate ([mim][PF 6 ]) functionalized magnetic sorbent selectively adsorbed Cr(VI) at pH 5.5 through anionic exchange, 35 and 1-hexadecyl-3-methylimidazolium bromide ([C 16 mim][Br])-coated magnetic NMs adsorbed a Cr(VI) chelate with 9-phenyl-2,3,7-trihydroxy-6-fluorone at pH 5.0. 36 Very recently, PEG 4000-modified Fe 3 O 4 nanoparticles coated with dianionic amino acid ionic liquid (AAIL) were synthesized by Yang et al and applied to the MSPE of trypsin for the first time.…”

New composite sorbent for speciation analysis of soluble chromium in textiles

“…Furthermore, ionic liquids have been successfully applied in speciation analysis of trace elements as effective solvents for liquid-liquid extraction procedures [19,20], as well as layer coatings supported on appropriate carriers, e.g. chitosan [21], polyvinyl chloride [22], silica coated magnetic nanoparticles [23]. Effective "green" sorbents for Cr(VI) separation and enrichment have been recently introduced based on ionic liquids with high separation efficiency and selectivity supported on silica gel with high surface area, chemical activity and mechanical stability [24−29].…”