Journal
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
Volume 71, Issue -, Pages 426-432Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jtice.2016.11.033
Keywords
Graphene oxide; Dithiocarbamate; Divalent lead ions; Adsorption; Functional groups; Adsorption mechanism
Categories
Funding
- National Natural Science Foundation of China [21571191, 21471163]
- Provincial Natural Science Foundation of Hunan [2016JJ1023]
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A novel adsorbent, dithiocarbamate group functionalized graphene oxide (DTC-GO), was prepared to promote the adsorption efficiency for Pb(II) ions in aqueous solution. To get insight of the structure and property of DTC-GO, the technologies of Fourier Transform Infrared (FT-IR) Spectroscopy, Scanning Electron Microscopy (SEM), Thermal gravimetric analysis (TGA) and Raman spectra were used. All characteristic results verified the successful introduction of dithiocarbamate group on graphene oxide. The effects of contact time, solution pH, initial metal ions concentration and temperature on the adsorption of Pb(II) with DTC-GO were studied systematically. The adsorption models of isotherms and kinetics were employed to investigate the adsorption mechanism. Based on experimental data, Langmuir isotherm and pseudo-second-order kinetic models showed a better correspondence to the adsorption process. Furthermore, the maximum uptake of DTC-GO obtained from Langmuir isotherm reached to 132.01 mg/g. The values of Delta G(theta) and Delta H-0 calculated from the experimental data indicated that the nature of the interaction between Pb (II) and DTC-GO was not only feasible and spontaneous but also exothermic in all cases. (C) 2016 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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