Clean Technology Approach for the Competitive Binding of Toxic Metal ions onto MnO2 nano-bioextractant
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Date
2016-01-15
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Springer
Abstract
The competitive extraction of Cr(III) onto Nauclea diderrichii seed epicarp doped with MnO2 nanoparticles (MnO2 nano-bioextractant (MNB)) in a single and binary batch system was studied. For validity of experimental data, chi square test, root mean square error, sum of the square errors, hybrid fractional error function, Marquart’s percent standard deviation and standard absolute error were used. Among the kinetic models used, pseudo-second-order and Langmuir equations gave the best fits for the experimental data, with qe (mg/g) for the uptake of Cr(III) in single metal system onto MNB, then Cr(III) with Cd(II), Pb(II), Hg(II), KCl and CaCl2 in binary metal systems onto MNB were 2.611, then 1.989, 1.016, 2.208, 1.249 and 1.868 from kinetic standpoint, respectively. The initial sorption rates, h (mg/g/min), and half lives, t1/2 (min), for the uptake of Cr(III) in single metal system onto MNB, then Cr(III) with Cd(II), Pb(II), Hg(II), KCl and CaCl2 in binary metal system onto MNB were 3.497, then 2.311, 2.274, 0.242, 2.956, 45.568 and 0.747, then 5.769, 1.766, 12.144, 1.762, and 2.415, respectively. Physicochemical surface analyses such as pH of point of zero charge, Brunauer–Emmett–Teller single point and multipoint techniques for surface area analyses, scanning electron microscopy and transmission electron microscopy were done on MNB and MnO2 nanoparticles in order to understand their surface microstructures. Desorption study showed that MNB can be recycled and used for future study. Hence, MNB showed good potential to remediate Cr(III) from wastewaters and polluted water.
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The authors acknowledge the support of The World Academy of Sciences—for the advancement of science in developing countries (TWAS), Italy and the Chinese Academy of Sciences (CAS), China for providing Fellowship (FR Number: 3240240234) to Dr Martins O. Omorogie at the Laboratory for Nanodevices of the National Center for Nanoscience and Technology, Beijing, China where this research was done. This work was also supported in part by the National Basic Research Program of China (973 Program No. 2011CB933401) and the National Natural Science Foundation of China (21005023). Prof. Jian R. Gong gratefully acknowledges the support of the K.C. Wong Education Foundation, Hong Kong.
Keywords
Nauclea diderrichii, Nano-bioextractant, Doping, Kinetics, Mass transfer
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