title: Removal of Lead(II) ions from aqueous solutions using biocompatible polymeric nano-adsorbents: A comparative study.
abstract: Low-cost and biocompatible chitin nanofiber and chitosan nanoparticle as natural polymers synthesized successfully by means of a mechanical and a chemical procedure respectively. The surface properties and size of chitin nanofibers (CNFs) and chitosan nanoparticles (CNPs) were characterized using a scanning electron microscope (SEM). CNF and CNP were utilized for separation of lead(II) metal ions from aqueous solution, and the influence of effective factors were investigated. It was found that both adsorbents can adsorb lead ions from the solution effectively, but sorption efficiency for CNP at all the stages was greater than CNF. Furthermore, the results of corresponding equilibrium data with adsorption isotherms revealed that CNF and CNP are more compatible with Freundlich and Langmuir adsorption isotherms respectively. It shows that, for CNF, adsorption process occurs as a heterogeneous and multi-layer process, while for CNP, adsorption process is predicted to befall as a homogenous and single-layer process. At the end kinetics and thermodynamic studies were performed for both Nano-adsorbents.
authors.affiliation: Department of Chemistry, Faculty of Sciences, University of Tehran, P.O. Box 14155- 6455, Tehran, Iran. Electronic address: Siahkamari.mohsen@yahoo.com.
authors.forename: Mohsen
authors.initials: M
authors.lastname: Siahkamari
authors.affiliation: Department of Chemistry, Faculty of Sciences, University of Tehran, P.O. Box 14155- 6455, Tehran, Iran.
authors.forename: Abbas
authors.initials: A
authors.lastname: Jamali
authors.affiliation: Polymer Engineering Department, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box: 14155-143, Tehran, Iran.
authors.forename: Alireza
authors.initials: A
authors.lastname: Sabzevari
authors.affiliation: Department of Chemistry, Faculty of Sciences, University of Tehran, P.O. Box 14155- 6455, Tehran, Iran. Electronic address: Alireza.shakeri@khayam.ut.ac.ir.
authors.forename: Alireza
authors.initials: A
authors.lastname: Shakeri
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D007477:Ions; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D057139:Nanofibers; D053758:Nanoparticles; D012996:Solutions; D014867:Water
chemical_list: D007477:Ions; D012996:Solutions; D014867:Water; D007854:Lead; D048271:Chitosan
keywords: Biocompatible polymer; Chitin nanofibers; Chitosan nanoparticles; Kinetics study; Lead(II) removal; Thermodynamic study