title: High performance NiFe layered double hydroxide for methyl orange dye and Cr(VI) adsorption.
abstract: The NiFe layered double hydroxides (LDHs) with different mole ratio of Ni/Fe (4:1, 3:1, 7:3 and 1:1) were prepared by a simple coprecipitation method. The adsorption performance were evaluated by the removal of methyl orange (MO) dye and hexavalent chromium(VI) heavy metal ion. It is found that Ni4Fe1-LDH can remove more than 92% of MO in 10 min at the 10 mg/L MO initial concentration, and 97% of Cr(VI) in 1 h at 4 mg/L Cr2O7(2-) initial concentration. The saturated adsorption capacity of Ni4Fe1-LDH is found to be as large as 205.76 mg/g for MO and 26.78 mg/g for Cr(VI). The adsorption behavior of this new adsorbent is ﬁtted well with Langmuir isotherm and the pseudo-second-order kinetic model, indicative of a monolayer and chemical adsorption that synergistically originates from exchangeable anions mechanism and layer charge density. Due to the excellent removal capacity of MO and Cr(VI), the NiFe-LDHs could be a promising adsorbent for wastewater treatment.
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China; National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Lu
authors.affiliation: National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China. Electronic address: lfang@cqu.edu.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Fang
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China.
authors.forename: Faling
authors.initials: F
authors.lastname: Ling
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China.
authors.forename: Jiemei
authors.initials: J
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China. Electronic address: fang01234@163.com.
authors.forename: Fang
authors.initials: F
authors.lastname: Wu
authors.affiliation: State Key Laboratory of Mechanical Transmission, College of Physics, Chongqing University, Chongqing 400044, China; School of Optoelectronic Information, Chongqing University of Technology, Chongqing 400054, China.
authors.forename: Xihua
authors.initials: X
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001391:Azo Compounds / Q000737:chemistry*; D002857:Chromium / Q000737:chemistry*; D006878:Hydroxides / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D008962:Models, Theoretical; D009532:Nickel / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D006878:Hydroxides; D014874:Water Pollutants, Chemical; D002857:Chromium; C074702:chromium hexavalent ion; C100258:methyl orange; D009532:Nickel; D007501:Iron
keywords: Anions exchange; Charge density; Cr(VI); Methyl orange (MO); NiFe-LDH