title: Effective removal of Cu (II) ions from aqueous solution by amino-functionalized magnetic nanoparticles.
abstract: A novel magnetic nano-adsorbent (MNP-NH(2)) has been developed by the covalent binding of 1,6-hexadiamine on the surface of Fe(3)O(4) nanoparticles for removal of Cu(2+) ions from aqueous solution. Various factors affecting the uptake behavior such as contact time, temperature, pH, salinity, amount of MNP-NH(2) and initial concentration of Cu(2+) were investigated. The kinetics was evaluated utilizing the Lagergren pseudo-first-order, pseudo-second-order, Elovich and intra-particle diffusion models. The equilibrium data were analyzed using Langmuir, Freundlich, and Dubinin-Radushkevich isotherms. The adsorption was relatively fast and the equilibrium was established within 5 min, and its kinetics followed the pseudo-second-order mechanism, evidencing chemical sorption as the rate-limiting step of sorption mechanism. The best interpretation for the equilibrium data was given by Langmuir isotherm, and the maximum adsorption capacities was 25.77 mg g(-1) at pH 6, and 298 K. Thermodynamic parameters showed that the adsorption process was spontaneous, endothermic and chemical in nature. The successive adsorption-desorption studies indicated that the MNP-NH(2) sorbent kept its adsorption and desorption efficiencies constant over 15 cycles. Importantly, MNP-NH(2) was able to remove 98% of Cu(2+) from polluted river and tap water.
authors.affiliation: College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, 19(A) Yu Quan Road, Beijing 100049, China. Electronic address: ymhao@gucas.ac.cn.
authors.forename: Yong-Mei
authors.initials: YM
authors.lastname: Hao
authors.affiliation: College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, 19(A) Yu Quan Road, Beijing 100049, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Man
authors.affiliation: College of Materials and Photoelectric Technology, Graduate University of Chinese Academy of Sciences, 19(A) Yu Quan Road, Beijing 100049, China. Electronic address: huzq@gucas.ac.cn.
authors.forename: Zhong-Bo
authors.initials: ZB
authors.lastname: Hu
mesh_terms: D000327:Adsorption; D003300:Copper / Q000302:isolation & purification*; D005290:Ferric Compounds / Q000737:chemistry*; D007700:Kinetics; D008280:Magnetics; D053768:Metal Nanoparticles; D014867:Water / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D014867:Water; C000499:ferric oxide; D003300:Copper