title: Application of magnetic particles modified with amino groups to adsorb copper ions in aqueous solution.
abstract: A magnetic adsorbent can be easily recovered from treated water by magnetic force, without requiring further downstream treatment. In this research, amine-functionalized silica magnetite has been synthesized using N-[3-(trimethoxysilyl)propyl]-ethylenediamine (TPED) as a surface modification agent. The synthesized magnetic amine adsorbents were used to adsorb copper ions in an aqueous solution in a batch system, and the maximum adsorption was found to occur at pH 5.5 +/- 0.1. The adsorption equilibrium data fitted the Langmuir isotherm equation reasonably well, with a maximum adsorption capacity of 10.41 mg/g. A pseudo second-order model could best describe the adsorption kinetics, and the derived activation energy was 26.92 kJ/mol. The optimum condition to desorb Cu2+ from NH2/SiO2/Fe3O4 was provided by a solution with 0.1 mol/L HNO3.
authors.affiliation: Department of Chemical and Materials Engineering, "National" I-Lan University, I-Lan 260, Taiwan, China. yflin@niu.edu.tw
authors.forename: Yafen
authors.initials: Y
authors.lastname: Lin
authors.forename: Huawei
authors.initials: H
authors.lastname: Chen
authors.forename: Kaelong
authors.initials: K
authors.lastname: Lin
authors.forename: Boryann
authors.initials: B
authors.lastname: Chen
authors.forename: Chyowsan
authors.initials: C
authors.lastname: Chiou
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008280:Magnetics / Q000379:methods*; D008956:Models, Chemical; D052638:Particulate Matter / Q000737:chemistry*; D012996:Solutions; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
chemical_list: D000588:Amines; D007477:Ions; D052638:Particulate Matter; D012996:Solutions; D003300:Copper