Synthesis of polyethyleneimine (PEI) and β‐cyclodextrin grafted PEI nanocomposites with magnetic cores for lipase immobilization and esterification

Abstract

BACKGROUND: Fabrication of nanocomposites with magnetic core and their applications

Novel Fe3O4/hydroxyapatite/β‐cyclodextrin nanocomposite adsorbent: Synthesis and application in heavy metal removal from aqueous solution

“…Also, O‐H stretching vibration at around 3395 cm −1 and O‐H bending vibration at 1615 cm −1 are observed showing the –OH functional groups on the surface of Fe 3 O 4. In Figure b, the bands at 1037 and 1107 cm −1 characterize the stretching mode of phosphate (PO 4 3− , P‐O), while the bending vibration bands of phosphate (PO 4 3− , O‐P) can be overlapped by Fe‐O stretching vibration bands . The absorption bands at 2854 and 2926 cm −1 in Figure c is associated with aliphatic C‐H bonds of β ‐CD .…”

“…To prepare HA modified Fe 3 O 4 NPs (Fe 3 O 4 @HA), Ca (NO 3 ) 2 .4H 2 O (1.77 g) was dissolved in DW (50 mL), and pH of the solution was adjusted to 10 with NaOH. Then, the solution was added dropwise into an aqueous solution (50 mL) of (NH 4 ) 2 HPO 4 (1.74 g) and Fe 3 O 4 (0.048 g) over 30 min with mechanical stirring at 1100 rpm.…”

“…Nanomagnetite is the most important ferric oxide, which has high surface area to volume ratio, high activity and magnetic properties that lead to its facile collection from the aqueous phase, and most importantly, it is biocompatible and non‐toxic . However, magnetite nanoparticles (MNPs) tend to agglomerate because of their strong dipole–dipole interactions and thus their surface area and sorption capacity decrease . Moreover, they lack suitable surface functional groups, are insoluble, and have inferior stability; hence their use in large‐scale remediation processes is restrained .…”

“…HA is an inorganic material which constitutes a main part of bones and teeth. It has excellent biocompatibility, excellent mechanical stability, slow biodegradation, and good adsorption capacity toward heavy metal ions, making it an excellent material to be combined with Fe 3 O 4 . Moreover, the adsorption capacity of the composite can be further increased by adding another organic constituent with suitable functional groups.…”

Synthesis, Thermal and Combustion Properties of New Polyamide/Amidoacid@Fe3O4 Nanocomposite

“…It is also known that the solubility of polymers is often increased when flexible bonds such as [-O-, -SO 2 -, -CH 2 -] are incorporated into the polymer backbone. [30][31][32][33][34][35][36] In the present work, a new biobased polyamide/amidoacid-functionalized Fe 3 [16][17][18][19][20][21][22][23][24][25] These nanocomposites represent a class of functionalized materials possessing various applications in batteries, electrochemical display devices, electromagnetic interference shielding, electro magneto rheological fluids, microwave absorbing materials, magnetic separations, enzyme immunoassay, and drug targeting.…”