Adsorption of heavy metal ions from aqueous solution onto chitosan entrapped CM-cellulose hydrogels synthesized by irradiation

• Published in: Journal of applied polymer science Vol. 110; no. 3; pp. 1388 - 1395
• Main Authors: Zhao, Long, Mitomo, Hiroshi
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.11.2008; Wiley
• Subjects: adsorption; Applied sciences; carboxymethylcellulose; chitosan; Exact sciences and technology; hydrogel; irradiation; metal ions; Natural polymers; Organic polymers; Physicochemistry of polymers; Properties and characterization; Solution and gel properties; Starch and polysaccharides; Molecular structure; Crosslink density; Adsorption capacity; Metal ion; Property processing relationship; irradiation; Colloidal gel; Crosslinked polymer; Cellulose ether; Cellulose(carboxymethyl); adsorption; Polymer blends; Liquid solid adsorption; Electron beam; Experimental study; metal ions; Organic adsorbent; Radiochemical crosslinking; Polyelectrolyte; carboxymethylcellulose; Cellulose derivatives; Oside polymer; Polyacid; Chitosan; Hydrogel; Aqueous solution
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.28718

The application of novel environment-conscious hydrogels as an adsorbent for heavy metal ions adsorption from aqueous solutions was examined. Chitosan was blended with highly concentrated carboxymethylated cellulose (CM-cellulose) solution to form CM-cellulose/chitosan physical hydrogels, which were crosslinked by additionless irradiation technique. The adsorptive properties of the blend hydrogels against some divalent heavy metal ions were investigated by batch adsorption method. It was found that the addition of chitosan increased the crosslinking degree and the adsorption capacity of the blend hydrogels. As a typical example, experimental data of Cu(II) ion were exploited for kinetic and isothermal evaluations. Copper adsorption process was found to be initially transport-controlled, and its adsorption isotherm can be fitted well into the Langmuir equation. Cu(II) adsorption mechanism can be viewed as the complexation of the Cu(II) with carboxyl groups and amino groups on the CM-cellulose/chitosan gel during the adsorption. From these preliminary evaluations, it is possible to conclude that the CM-cellulose/chitosan blend hydrogels have great potential for applications in water treatment for the removal of heavy metal ions.