title: Design of a new integrated chitosan-PAMAM dendrimer biosorbent for heavy metals removing and study of its adsorption kinetics and thermodynamics.
abstract: In this research, different generations of PAMAM-grafted chitosan as integrated biosorbents were successfully synthesized via step by step divergent growth approach of dendrimer. The synthesized products were utilized as adsorbents for heavy metals (Pb(2+) in this study) removing from aqueous solution and their reactive Pb(2+) removal potential was evaluated. The results showed that as-synthesized products with higher generations of dendrimer, have more adsorption capacity compared to products with lower generations of dendrimer and sole chitosan. Adsorption capacity of as-prepared product with generation 3 of dendrimer is 18times more than sole chitosan. Thermodynamic and kinetic studies were performed for understanding equilibrium data of the uptake capacity and kinetic rate uptake, respectively. Thermodynamic and kinetic studies showed that Langmuir isotherm model and pseudo second order kinetic model are more compatible for describing equilibrium data of the uptake capacity and kinetic rate of the Pb(2+) uptake, respectively.
authors.affiliation: Institute of Nano Science and Nano Technology, University of Kashan, Kashan, Iran.
authors.forename: Zabihullah
authors.initials: Z
authors.lastname: Zarghami
authors.affiliation: Institute of Nano Science and Nano Technology, University of Kashan, Kashan, Iran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Akbari
authors.affiliation: Applied Biotechnology Research Center, Baqiyatallah University of Medical Science, Tehran, Iran. Electronic address: amlatifi290@gmail.com.
authors.forename: Ali Mohammad
authors.initials: AM
authors.lastname: Latifi
authors.affiliation: Applied Biotechnology Research Center, Baqiyatallah University of Medical Science, Tehran, Iran.
authors.forename: Mohammad Ali
authors.initials: MA
authors.lastname: Amani
mesh_terms: D000327:Adsorption; D048271:Chitosan / Q000737:chemistry*; D050091:Dendrimers / Q000737:chemistry*; D004785:Environmental Pollutants / Q000737:chemistry / Q000302:isolation & purification; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification*; D008956:Models, Chemical; D013816:Thermodynamics
chemical_list: D050091:Dendrimers; D004785:Environmental Pollutants; D019216:Metals, Heavy; C104700:PAMAM Starburst; D007854:Lead; D048271:Chitosan
keywords: Adsorption isotherm; Biosorbent; Chitosan; Dendrimer-grafted; PAMAM