title: Adsorption of Pb(2+) from aqueous solution using spinel ferrite prepared from steel pickling sludge.
abstract: In this paper, spinel ferrite with high crystallinity and high saturation magnetization was successfully prepared from steel pickling sludge by adding iron source and precipitator in the hydrothermal condition. The obtained spinel ferrite was characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), vibrating sample magnetometer (VSM), and Zeta potential methods and investigated as an adsorbent for removal of Pb(2+) from aqueous solution. Batch experiments were performed by varying the pH values, contact time, temperature and initial metal concentration. The result of pH impact showed that the adsorption of Pb(2+) was a pH dependent process, and the pH 5.8 ± 0.2 was found to be the optimum condition. The achieved experimental data were analyzed with various kinetic and isotherm models. The kinetic studies revealed that Pb(2+) adsorption onto spinel ferrite followed a pseudo-second order model, and the Langmuir isotherm model provided the perfect fit to the equilibrium experimental data. At different temperatures, the maximum Pb(2+) adsorption capacities calculated from the Langmuir equation were in the range of 126.5-175.4 mg/g, which can be in competition with other adsorbents. The thermodynamic results showed that the spinel ferrite could spontaneously and endothermically adsorb Pb(2+) from aqueous solution. The regeneration studies showed that spinel ferrite could be used five times (removal efficiency (%) >90%) by desorption with HNO3 reagent.
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China; Environmental Protection Department of Jiangsu Province, Nanjing 210036, China.
authors.forename: Binbin
authors.initials: B
authors.lastname: Fang
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Yubo
authors.initials: Y
authors.lastname: Yan
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Yang
authors.affiliation: China Energy Engineering Group Beijing Electric Power Construction Company, Beijing 100024, China.
authors.forename: Fenglian
authors.initials: F
authors.lastname: Wang
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Chu
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Xiuyun
authors.initials: X
authors.lastname: Sun
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Li
authors.affiliation: School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China E-mail: sunxyun@njust.edu.cn; Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, Nanjing 210094, China.
authors.forename: Lianjun
authors.initials: L
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D005290:Ferric Compounds / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis; D007700:Kinetics; D007854:Lead / Q000737:chemistry*; D013232:Steel; D013696:Temperature; D013816:Thermodynamics; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D013232:Steel; C001215:ferrite; D007854:Lead