title: The adsorption properties of Pb(II) and Cd(II) on functionalized graphene prepared by electrolysis method.
abstract: The functionalized graphene (GNS(PF6)) was fabricated by simple and fast method of electrolysis with potassium hexafluorophosphate solution as electrolyte under the static potential of 15 V. The characterization results of transmission electron microscopy, atom force microscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction, Raman spectroscopy and thermogravimetric analysis indicate that graphite rod was completely exfoliated to graphene layer containing 30 wt.% PF(6)- with the average thickness ca. 1.0 nm. Our sample of GNS(PF6) was developed for the removal of Pb(II) or Cd(II) ions from water, and the determined adsorption capacities are 406.6 mg/g (pH=5.1) for Pb(II) and 73.42 mg/g (pH=6.2) for Cd(II), which is much higher than that by our previous sample of GNS(C8P) and carbon nanotube. The adsorption processes reach equilibrium in just 40 min and the adsorption isotherms are described well by Langmuir and Freundlich classical isotherms models.
authors.affiliation: Key Laboratory of Polyoxometalates Science of Ministry of Education, College of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xiaojiao
authors.initials: X
authors.lastname: Deng
authors.forename: Lili
authors.initials: L
authors.lastname: Lü
authors.forename: Hongwei
authors.initials: H
authors.lastname: Li
authors.forename: Fang
authors.initials: F
authors.lastname: Luo
mesh_terms: D000327:Adsorption; D002104:Cadmium / Q000302:isolation & purification*; D002623:Chemistry Techniques, Analytical; D004572:Electrolysis / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D007700:Kinetics; D007854:Lead / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D002104:Cadmium; D007854:Lead; D006108:Graphite