title: Novel negatively charged hybrids. 3. Removal of Pb2+ from aqueous solution using zwitterionic hybrid polymers as adsorbent.
abstract: Using zwitterionic hybrid polymers as adsorbent, the adsorption kinetics and isotherm, thermodynamic parameters of Delta G, Delta H and DeltaS for the removal of Pb(2+) from aqueous solution were investigated. It is indicated that the adsorption of Pb(2+) ions on these zwitterionic hybrid polymers followed the Lagergren second-order kinetic model and Freundlich isotherm model, demonstrating that the adsorption process might be Langmuir monolayer adsorption. The negative values of Delta G and the positive values of Delta H evidence that Pb(2+) adsorption on these zwitterionic hybrid polymers is spontaneous and endothermic process in nature. Moreover, the zwitterionic hybrid polymers produced reveal relatively higher desorption efficiency in 2 mol dm(-3) aqueous HNO(3) solution, indicating that they can be recycled in industrial processes. These findings suggest that these zwitterionic hybrid polymers are the promising adsorbents for Pb(2+) removal and can be potentially applied in the separation and recovery of Pb(2+) ions from the waste chemicals and contaminated water of lead-acid rechargeable battery.
authors.affiliation: Key Laboratory of Membrane Materials & Processes, Department of Chemical and Materials Engineering, Hefei University, 373 Huangshan Road, Hefei, Anhui 230022, China. jsliu@hfuu.edu.cn
authors.forename: Junsheng
authors.initials: J
authors.lastname: Liu
authors.forename: Yue
authors.initials: Y
authors.lastname: Ma
authors.forename: Yaping
authors.initials: Y
authors.lastname: Zhang
authors.forename: Guoquan
authors.initials: G
authors.lastname: Shao
mesh_terms: D000327:Adsorption; D000465:Algorithms; D002852:Chromatography, Ion Exchange; D007202:Indicators and Reagents; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D008962:Models, Theoretical; D011108:Polymers / Q000737:chemistry*; D012996:Solutions; D013816:Thermodynamics; D014867:Water
chemical_list: D007202:Indicators and Reagents; D011108:Polymers; D012996:Solutions; D014867:Water; D007854:Lead