title: Removal of cobalt ions from aqueous solution by an amination graphene oxide nanocomposite.
abstract: A newly designed amination graphene oxide (GO-NH2), a superior adsorption capability to that of activated carbon, was fabricated by graphene oxide (GO) combining with aromatic diazonium salt. The resultant GO-NH2 maintained a high surface area of 320 m(2)/g. When used as an adsorbent, the GO-NH2 demonstrated a very quick adsorption property for the removal of Co(II) ions, more than 90% of Co(II) ions could be removed within 5 min for dilute solutions at 0.3g/L adsorbent dose. The adsorption capability approaches 116.35 mg/g, which is one of the highest capabilities of today's materials. The thermodynamic parameters calculated from temperature-dependent adsorption isotherms suggested that the Co(II) ions adsorption on GO-NH2 was a spontaneous process. Considering the superior adsorption capability, the GO-NH2 filter membrane was fabricated for the removal of Co(II) ions. Membrane filtration experiments revealed that the removal capabilities of the materials for cobalt ions depended on the membrane's thickness, flow rate and initial concentration of Co(II) ions. The highest percentage removal of Co(II) exceeds 98%, indicating that the GO-NH2 is one of the very suitable membrane materials in environmental pollution management.
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China; College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China.
authors: Fang
authors: F
authors: Fang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. Electronic address: ltkong@iim.ac.cn.
authors: Lingtao
authors: L
authors: Kong
authors: College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China.
authors: Jiarui
authors: J
authors: Huang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230039, China.
authors: Shibiao
authors: S
authors: Wu
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
authors: Kaisheng
authors: K
authors: Zhang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China; School of Chemistry and Chemical Engineering, Anhui University, Hefei, Anhui 230039, China.
authors: Xuelong
authors: X
authors: Wang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
authors: Bai
authors: B
authors: Sun
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
authors: Zhen
authors: Z
authors: Jin
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China.
authors: Jin
authors: J
authors: Wang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. Electronic address: xjhuang@iim.ac.cn.
authors: Xing-Jiu
authors: XJ
authors: Huang
authors: Research Center for Biomimetic Functional Materials and Sensing Devices, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei, Anhui 230031, China. Electronic address: jhliu@iim.ac.cn.
authors: Jinhuai
authors: J
authors: Liu
mesh_terms: D000327:Adsorption; D000586:Amination; D003035:Cobalt / Q000737:chemistry*; D005374:Filtration; D006108:Graphite / Q000737:chemistry*; D008567:Membranes, Artificial; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D011145:Polyvinyls; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods; D005465:Fluorocarbon Polymers
chemical_list: D003035:Cobalt; D006108:Graphite; D008567:Membranes, Artificial; D010087:Oxides; D011145:Polyvinyls; D014874:Water Pollutants, Chemical; C024865:polyvinylidene fluoride; D005465:Fluorocarbon Polymers
keywords: Adsorption; Cobalt; GO-NH(2); Kinetics; Membrane; Thermodynamics