Novel chitosan-cellulose hydrogel adsorbents for lead adsorption
نویسنده
چکیده
In this study, we examined the properties of chitosan-cellulose hydrogel beads as an adsorbent and its application for lead ion adsorption. Chitosan was blended with cellulose to improve the mechanical strength of chitosan hydrogel beads and the chitosan-cellulose hydrogel beads were cross-linked with ethylene glycol diglycidyl ether (EGDE) to enhance their acid-resistant ability. Scanning electron microscopic (SEM) observation also showed that the crosslinking reaction resulted in the chitosan-cellulose hydrogel beads having porous surface structure. Batch adsorption experiments indicated that both the chitosan-cellulose and the crosslinked chitosan-cellulose hydrogel beads had high adsorption capacities for lead ion removal although the adsorption performances were pH-dependent. The adsorption isotherm of chitosan-cellulose beads and crosslinked chitosan-cellulose beads can be well fitted to the Freundlich model. The kinetic adsorption data obeyed the Fickan’s law and suggested an intraparticle-diffusion-controlled adsorption process. X-ray photoelectron spectroscopy (XPS) revealed that the amine groups on chitosan were involved in the surface complexation for lead ion adsorption.
منابع مشابه
Chitosan, the Marine Functional Food, Is a Potent Adsorbent of Humic Acid
Chitosan is prepared by the deacetylation of chitin, the second-most abundant biopolymer in nature, and has applicability in the removal of dyes, heavy metals and radioactive waste for pollution control. In weight-reduction remedies, chitosan is used to form hydrogels with lipids and to depress the intestinal absorption of lipids. In this study, an experimental method was implemented to simulat...
متن کاملInvestigations on the adsorbents for uremic middle molecular toxins (II) Influences of crosslinking agent chain length on the adsorption capacities of crosslinked chitosan adsorbents
Chitosan resins, which clinically served as adsorbents in hemoperfusion therapy, were prepared with reversed-phase suspension methodology using three differently structured crosslinking agents, methanal, glyoxal and glutaraldehyde. And the glyoxal and glutaraldehyde crosslinked chitosan resins were reduced with NaBH4 afterwards. By analyzing the results from FTIR and SEM, it was found that the ...
متن کاملAdsorption of Heavy Metal Ions: Role of Chitosan and Cellulose for Water Treatment
Rapid industrialization and modernization have introduced substantial amounts of toxic heavy metals into the aquatic and terrestrial environment which possess a serious threat to the flora and fauna. In recent years, considerable research work has been done and is currently underway on a number of natural biopolymers and their modifications to remove different kinds of heavy metal ions. Chitosa...
متن کاملNovel modification of chitosan hydrogel beads for improved properties as an adsorbent
Chitosan, a natural polysaccharide, has increasingly been studied as an adsorbent for heavy metal removal in recent years. The amine groups in chitosan are generally known to be the main adsorption sites for heavy metal ions. However, due to the instability of chitosan in acidic solutions, chemical crosslinking has often been used to enhance the acidic resistance of the material. Since most of ...
متن کاملAdsorption of Heavy Metals by Graphene Oxide/Cellulose Hydrogel Prepared from NaOH/Urea Aqueous Solution
By taking advantage of cellulose, graphene oxide (GO), and the process for crosslinking using epichlorohydrin (ECH), we propose a simple and novel method to prepare GO/cellulose hydrogel with good potential to adsorb metal ions. GO nanosheets containing carboxyl and hydroxyl groups were introduced into the surface of the cellulose hydrogel with retention of the gel structure and its nanoporous ...
متن کامل