NDLI: Adsorption of divalent metal ions from aqueous solutions using graphene oxide

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Heimann, Jan Sitko, Rafal Wrzalik, Roman Turek, Edyta Malicka, Ewa Feist, Barbara Zawisza, Beata Talik, Ewa Gagor, Anna
Description	Author Affiliation: Sitko R ( University of Silesia, Institute of Chemistry, ul. Szkolna 9, 40-006 Katowice, Poland. rafal.sitko@us.edu.pl)
Abstract	The adsorptive properties of graphene oxide (GO) towards divalent metal ions (copper, zinc, cadmium and lead) were investigated. GO prepared through the oxidation of graphite using potassium dichromate was characterized by scanning electron microscopy ( SEM ), powder X-ray diffraction ( XRD ), X-ray photoelectron spectroscopy ( XPS ) and infrared spectroscopy ( FT-IR ). The results of batch experiments and measurements by flame atomic absorption spectrometry ( F-AAS ) indicate that maximum adsorption can be achieved in broad pH ranges: 3–7 for Cu(II), 5–8 for Zn(II), 4–8 for Cd(II), 3–7 for Pb(II). The maximum adsorption capacities of Cu(II), Zn(II), Cd(II) and Pb(II) on GO at pH = 5 are 294, 345, 530, 1119 mg $g^{−1},$ respectively. The competitive adsorption experiments showed the affinity in the order of Pb(II) > Cu(II) ≫ Cd(II) > Zn(II). Adsorption isotherms and kinetic studies suggest that sorption of metal ions on GO nanosheets is monolayer coverage and adsorption is controlled by chemical adsorption involving the strong surface complexation of metal ions with the oxygen-containing groups on the surface of GO. Chemisorption was confirmed by XPS (binding energy and shape of O1s and C1s peaks) of GO with adsorbed metal ions. The adsorption experiments show that the dispersibility of GO in water changes remarkably after complexation of metal ions. After adsorption , the tendency to agglomerate and precipitate is observed. Excellent dispersibility of GO and strong tendency of GO–Me(II) to precipitate open the path to removal of heavy metals from water solution. Potential application of GO in analytical chemistry as a solid sorbent for preconcentration of trace elements and in heavy metal ion pollution cleanup results from its maximum adsorption capacities that are much higher than those of any of the currently reported sorbents.
ISSN	14779226
Issue Number	16
Journal	Dalton Trans.
Volume Number	42
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2013-04-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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