Adsorption behaviour of Fe(II) and Fe(III) ions in aqueous solution on chitosan and cross-linked chitosan beads

Pd embedded in chitosan microspheres as tunable soft-materials for Sonogashira cross-coupling in water–ethanol mixture

“…This has been confirmed by DRIFT where the typical signal of primary amine at 1592 cm -1 significantly 10 decreases at the expense of new band at 1638 cm -1 due to (C=N) vibration (S3, SI). 13 C MAS NMR spectroscopy reveals the existence of additional peaks with respect to those of native chitosan (signals around 27.9, 43.6 and 96.7 ppm can be respectively attributed to central CH2-CH2-CH2, the CH2-CH2- 15 HC=N and the carbon directly attached to nitrogen atom (C=N)) (S4, SI). In the case of CS-SH material, carbon signals of the grafted thiol overlaps with those of native chitosan.…”

“…18,19 At this point, three Pd-hosted alcogel-and aerogel-based materials with similarities in their intrinsic textural properties of the support (macroporous fibrillar network and millimetric 10 dimension of the microspheres), but with different metalsupport coordination strength (weakly coordinated Pd in CS, incarcerated Pd nanoparticles in CS-Glu and strongly coordinated Pd 2+ in CS-SH) were prepared. Beside our motivation to elucidate -for the first time -the difference on 15 the performance of support in catalysis between CS alcogels and aerogels, a second important point is to determine how CS functionalization influences the catalytic activity and if there is a borderline between efficient scavenger and efficient catalyst. To address thes issues, Sonogashira cross-coupling of aryl 20 iodide and acetylene derivatives was selected as a prototypical reaction.…”

Optimization of Sorption Parameters for Color Removal of Textile Dye by Cross-linked Chitosan Beads Using Box-Behnken Design

“…Crosslinked chitosan-epichlorohydrine beads (CEB) of particles size (<250 μm) was prepared according to the same procedure described previously [13]. −1 , and with 50% dye content was chosen as adsorbate.…”

Equilibrium modeling of mono and binary sorption of Cu(II) and Zn(II) onto chitosan gel beads

“…This is because in acidic solutions, more protons will be available to protonate amine groups to form groups -NH 3 , reducing the number of binding sites for the adsorption of Cu(II) and/or Zn(II). Whereas, at higher solution pH adsorption increases due to the decreased inhibitory effect of H + (Wan Ngah et al, 2005). Therefore heavy metal ions were better sorbed by chitosan at higher solution pH.…”