Fe3O4 nanoparticles coated by new functionalized tetraaza-2,3 dialdehyde micro-crystalline cellulose: synthesis, characterization, and catalytic application for degradation of Acid Yellow 17

Abstract

International audienc

New sonochemical magnetite nanoparticles functionalization approach of dithiooxamide–formaldehyde developed cellulose: From easy synthesis to recyclable 4‐nitrophenol reduction

“…[ 11 ] DAC Schiff base condensations reactions have usually been carried out using primary amines [ 6–11 ] or primary diamines. [ 5,12–15 ] Dithiooxamide (or rubeanic acid NH 2 C (=S) C (=S) NH 2 )) is an organic molecule. [ 16 ] The existence of S and NH 2 as dithiooxamide functional groups is favored owing to the hard–soft acid base (HSAB) theory elaborated by Pearson.…”

“…[ 22 ] Generally speaking, combining magnetite nanoparticles (NPs) with natural or modified biopolymer chains gives rise to novel materials possessing consecutive improvement [ 23,24 ] in electrical, [ 25 ] thermal, [ 26 ] and mechanical [ 23 ] hosting material properties. Magnetite‐functionalized biopolymers seem to be easily eco‐friendly and recyclable green catalysts in organic compounds synthesis, [ 27–38 ] cancer therapy, [ 39 ] heavy metals removal [ 40–42 ] dyes degradation, [ 12,13,43 ] and epoxidation and oxidation catalytic processes. [ 44 ]…”

“…Besides, a review of the literature revealed several synthetic techniques of Fe 3 O 4 NPs such as coprecipitation, [ 12,13,15 ] hydrothermal, [ 47 ] spray pyrolysis technique, [ 48 ] microwave‐assisted method, [ 49 ] solvothermal method, [ 50 ] and polymerization oxidation. [ 51 ] Conventional synthetic methods fail to control the shape of Fe 3 O 4 NPs coated on an organic surface, extended reaction time, and magnetic NPs agglomeration.…”

Resource‐Saving Production of Dialdehyde Cellulose: Optimization of the Process at High Pulp Consistency

“…These modifications are mostly based on Schiff base reactions . Several applications for crosslinked DAC have been reported, ranging from protein or dye absorbers to nanoparticle carriers . Moreover, grafted surfaces, beads, and gels have been prepared from DAC.…”

“…[11,12] Severalapplications for crosslinked DAC have been reported, ranging from protein or dye absorbers to nanoparticle carriers. [13,14] Moreover, grafteds urfaces, [15][16][17] beads, and gels [18][19][20][21] have been prepared from DAC. DAC also raises interesta saprecursor to yield more complex materials, such as hollow spheres [22] and hairy cellulose nanocrystals.…”