Removal of chromium (VI) from aqueous solution using exfoliated graphite/polyaniline composite

Show simple item record Tshemese, S.J. (Siyabulela) Mlaba, T.T. (Thubelihle) Tichapondwa, Shepherd Masimba Mhike, Washington 2021-03-25T10:03:26Z 2021-03-25T10:03:26Z 2020
dc.description.abstract Exfoliated graphite/polyaniline (EG/PANI) composites were successfully prepared via in situ polymerization of aniline monomer in the presence of exfoliated graphite. The PANI precipitated into the interlayer space of the graphite flake significantly improving physiochemical properties of EG. The particle morphology and interaction of the EG and PANI was determined using the scanning electron microscopy (SEM). The SEM images clearly showed the formation of PANI and EG/PANI composite with PANI greatly covering the EG flake. The presence of polyaniline and its major functional groups were confirmed using Fourier Transform Infrared Spectroscopy (FTIR) between 3,500 – 3,000 cm-1 and 1,500 - 500 cm-1 . A 68 % change in Brunauer- Emmett-Teller (BET) surface area was observed in the 0.35 g PANI/g EG after the in situ polymerization of the PANI. The effectiveness of the composite adsorbent on the removal of Cr (VI) from aqueous solutions was evaluated by evaluating the effects of parameters such as EG to PANI ratio and initial concentration. The optimum composite loading was found to be 0.35 g PANI/g EG and removed more than 99 % of Cr (VI) from an initial concentration of 100 ppm was removed at 20 g/L loading within 4 h. The Freundlich adsorption isotherm model best described the adsorption of Cr (VI) with a regression coefficient, r 2 of 0.99 showing the heterogeneous adsorption at the surface of the composite. The maximum capacity of the composite was 38.20 mg/g. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.librarian pm2021 en_ZA
dc.description.sponsorship The National Research Foundation of South Africa en_ZA
dc.description.uri en_ZA
dc.identifier.citation Tshemese S.J., Mlaba T.T., Tichapondwa S.M., Mhike W., 2020, Removal of Chromium (VI) from Aqueous Solution Using Exfoliated Graphite/Polyaniline Composite, Chemical Engineering Transactions, 81, 565-570, DOI:10.3303/CET2081095. en_ZA
dc.identifier.issn 2283-9216 (online)
dc.identifier.other 10.3303/CET2081095
dc.language.iso en en_ZA
dc.publisher Italian Association of Chemical Engineering en_ZA
dc.rights © 2020, AIDIC Servizi S.r.l. en_ZA
dc.subject Chromium (VI) en_ZA
dc.subject Aqueous solution en_ZA
dc.subject Exfoliated graphite/polyaniline (EG/PANI) en_ZA
dc.subject Scanning electron microscopy (SEM) en_ZA
dc.subject Fourier transform infrared spectroscopy (FTIR) en_ZA
dc.subject Brunauer- Emmett-Teller (BET) en_ZA
dc.title Removal of chromium (VI) from aqueous solution using exfoliated graphite/polyaniline composite en_ZA
dc.type Article en_ZA

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