Effect of molecular weight and degree of deacetylation of chitosan on urea adsorption properties of copper chitosan

Abstract

Copper chitosan complexes prepared by different specifications of chitosan and copper sulfate were used as urea sorbents. Experimental results showed that the adsorption capacity for urea of copper chitosan increased with an increasing degree of deacetylation and decreasing molecular weight of chitosan. The urea adsorption capacity of copper chitosan was 120.0 mg/g, when 1.0 g of copper chitosan was admitted to 100 mL of a 1300 mg/mL (pH 6.0) urea solution, with chitosan degree of deacetylation of 84.3% and viscosity molecular weight of 6.5 ϫ 10 5 , at 37°C for 8 h. No elution of the copper from the copper chitosan could be detected under the optimal conditions.

Removal of cadmium from aqueous solution using low molecular weight chitosan derivative

“…The adsorption capacity (2.27 mg/g) of cross-linked low molecular weight chitosan pyruvic acid derivative was probably due to both secondary amine and carboxyl groups which were evident in the FTIR analysis. Also, the molecular weight of the chitosan in the present study contributed to the adsorption capacity value because small intermolecular distance enhances intermolecular interactions (Boamah et al, 2014;Zhou, Yang, Guo, & Chen, 2003).…”

Novel polyelectrolyte carboxymethyl konjac glucomannan–chitosan nanoparticles for drug delivery. I. Physicochemical characterization of the carboxymethyl konjac glucomannan–chitosan nanoparticles

“…Following centrifugation, it was then precipitated with aqueous NaOH, washed with deionized water, and dried at 60°C under reduced pressure. The degree of deacetylation of CS was 95% by the titration method 25. CKGM was purified by initially dissolving in deionized water.…”

Applications of Chitin and Chitosan in Industry and Medical Science: A Review

“…Like cellulose, chitin and chitosan can undergo many reactions such as etherification, esterification and crosslinking (Hon 1996). The main parameter that affects the characteristics of chitosan is its molecular weight (Zhou et al 2003) and degree of deacetylation (representing the proportion of deacetylated units).…”