A novel zerovalent manganese for removal of copper ions: synthesis, characterization and adsorption studies

被引：65
作者：
Dada A.O. [1 ]
Adekola F.A. [2 ]
Odebunmi E.O. [3 ]
机构：
[1] Department of Physical Sciences, Industrial Chemistry, Landmark University, P.M.B.1001, Omu-Aran, Kwara
[2] Department of Industrial Chemistry, University of Ilorin, P.M.B. 1515, Ilorin
[3] Department of Chemistry, University of Ilorin, P.M.B. 1515, Ilorin
来源：
Applied Water Science | 2017年 / 7卷 / 03期
关键词：
Characterization; Copper; Isotherm; Kinetics; Manganese nanoparticles; Thermodynamics;
D O I：
10.1007/s13201-015-0360-5
中图分类号：
学科分类号：
摘要：
Synthesis of nanoscale zerovalent manganese (nZVMn) by chemical reduction was carried out in a single pot system under inert environment. nZVMn was characterized using a combination of analytical techniques: Ultraviolet–Visible Spectroscopy, Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Transmission Electron Microscopy, Energy Dispersive X-ray, BET surface area and Point of Zero Charge. The adsorption physicochemical factors: pH, contact time, adsorbent dose, agitation speed, initial copper ion concentration and temperature were optimized. The kinetic data fitted better to Pseudo second-order, Elovich, fractional power and intraparticle diffusion models and their validity was tested by three statistical models: sum of square error, Chi-square (χ2) and normalized standard deviation (Δq). Seven of the two-parameter isotherm models [Freundlich, Langmuir, Temkin, Dubinin–Kaganer–Raduskevich (DKR), Halsey, Harkin–Jura and Flory–Huggins] were used to analyse the equilibrium adsorption data. The Langmuir monolayer adsorption capacity (Qmax = 181.818 mg/g) obtained is greater than other those of nano-adsorbents utilized in adsorption of copper ions. The equilibrium adsorption data were better described by Langmuir, Freundlich, Temkin, DKR and Halsey isotherm models considering their coefficient of regression (R2 > 0.90). The values of the thermodynamic parameters: standard enthalpy change ∆H° (+50.27848 kJ mol−1), standard entropy change ∆S° (203.5724 J mol−1 K−1) and the Gibbs free energy change ∆G° revealed that the adsorption process was feasible, spontaneous, and endothermic in nature. The performance of this novel nanoscale zerovalent manganese (nZVMn) suggested that it has a great potential for effective removal of copper ions from aqueous solution. © 2015, The Author(s).
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页码：1409 / 1427
页数：18
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