Composite Membranes of Cellulose Acetate and Zirconium Dioxide:  Preparation and Study of Physicochemical Characteristics

Abstract

The composite membranes of zirconium oxide-cellulose acetate were prepared in a twostep procedure combining the phase-inversion method and deposition-hydrolysis technique. The first step allowed the preparation of membranes with different morphologies, and the second step allowed a highly dispersed metal oxide to be deposited on the membranes. The XPS O1s binding energy indicated that the interaction between the oxide and the cellulose matrix is probably of hydrogen bonding type. Phosphate retentions were 75 and 90% for the composite membrane in permeation experiments. The water fluxes for a pressure of 1.7 atm were (3.7 ( 1.7) × 10 -2 and (13.0 ( 2.1) × 10 -2 mL min -1 cm -2 . The membranes are very stable under continuous use. Regeneration of the membrane using NaOH 0.01 M eluent solution did not decrease significantly, ca. 10%, the membrane efficiency. The great advantage of these membranes is the low operational pressure required to obtain high phosphate retention.

Cellulose acetate-Al2O3 hybrid material coated with N-Propyl-1,4-diazabicyclo [2.2.2] octane chloride: preparation, characterization and study of some metal halides adsorption from ethanol solution

“…The polymer is relatively inert because the hydroxyl groups, which are responsible for the majority of the reactions with organic and inorganic reagents, are involved into inter-and intramolecular hydrogen bonding. 2,3 In order to make cellulose acetate more reactive, the surface modified composites have been prepared with many metal oxides such as TiO 2 As these oxides behave as good Lewis acids, the coated celluloses have been used in separation processes 9 for enzyme immobilization, 10 to prepare semi-permeable membranes 11 and to support electroactive chemical species for use as potentiometric sensors. 12 The hybrid organic-inorganic material, Cel/Al 2 O 3 , is of particular interest.…”

Polyisobutylene‐based biomaterials

“…In Figure 5(d), the CAC, COH, and COC peaks appeared at slightly higher (0.2 eV) binding energies, indicating nonspecific physisorption of Ciprofloxacine onto nonfunctionalized PS. 93 The CON, COO, and CAO peaks shifted by 0.4 eV to lower binding energies, with broadening of the COO and CON peaks, demonstrating hydrogen bonding of the Ciprofloxacine onto the thymine carbonyls and amides of the polymer. 94 The two extra C 1s peaks represent the carbonyl and carboxylic carbons of the adsorbed Ciprofloxacine molecules.…”

Metal Nanoparticles/Ionic Liquid/Cellulose: Polymeric Membrane for Hydrogenation Reactions

“…The solvent was evaporated in an open atmosphere for 2 min. A similar method was used to prepare blank CA polymeric membrane, except that no Rh(0) or Pt(0) nanoparticles were used [45][46][47][48] .…”