Preparation and characterization of chitosan/Cu(II) affinity membrane for urea adsorption

Abstract

We used silica particles as a porogen to prepare macroporous chitosan membranes and subsequently prepared macroporous chitosan/Cu(II) affinity membranes for urea adsorption. The morphology, porosity, Cu(II) adsorption capacity, and swelling ratio of the macroporous membrane were measured. SEM photographs show the pores in the membrane dispersed uniformly, a feature that didn't change much after the adsorption of Cu(II). The porosity of the membrane had a maximum value when the silica/chitosan ratio was about 12. The Cu(II) adsorption capacity in the membrane leveled off when the initial concentration of CuSO4 solution exceeded 5 × 10−2 mol/L. The macroporous chitosan/Cu(II) affinity membrane was successfully used for urea adsorption. The maximum urea adsorption capacity was 78.8 mg/g membrane, which indicates that the membrane has a great potential for hemodialysis for urea removal. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1108–1112, 2003

Physical Characteristics of Chitosan Based Film Modified With Silica and Polyethylene Glycol

“…On the other hand, formation of organic-inorganic composite film provides another approach to improve the physicochemical properties of chitosan and other biomaterials. Introduction of silica into the chitosan film increases its oxygen permeability, biocompatibility, and biodegradability [1][2][3][4][5][6][7][8].…”

“…The thermo stability and mechanical performances of the composite films are higher than that of chitosan film and increased with increasing the amount of silica added. However, the mechanical performance deteriorates with the excessive silica [1][2][3][5][6][7][8]. Addition of food-grade plasticizers (polyethylene glycol, PEG) to film-forming alleviates this problem.…”

Cu(II)-Cross-linked Chitosan Membrane (CCCM): Preparation, Characterization and Urea Removal Study Using the Diffusion-Cell Model (DCM)

“…The CS membranes were cut into pieces (5.0 cm × 5.0 cm) and kept in CuSO 4 solutions for 4 h. The films were taken out, washed extensively with distilled water and the dried to yield Cu(II)-immobilized CS membranes [28]. The CuSO 4 solution was analyzed spectrophotometrically (Shimadzu, Japan) for the remaining concentration of Cu(II) using the method described elsewhere [29].…”

“…Generally, the porous membranes are prepared by a phase-inversion method which involves use of liquid compounds as porogens [28]. In addition, porous membranes are also prepared by adding soluble substances (sugars, salts) into polymer solution before casting the membrane.…”

Extraction of Pb2+ using Silica from Rice Husks Ash (RHA) – Chitosan as Solid Phase

“…Adsorption is a good choice because this is the most economical method [2]. Adsorption of metal ions has been developed by utilizing a lot of adsorbents.…”