Chauke, VPMaity, ArjunChetty, A2016-02-232016-02-232015-07Chauke, V.P, Maity, A and Chetty, A. 2015. High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites. Journal of Molecular Liquids, vol. 211, pp 71-770167-7322http://ac.els-cdn.com/S0167732215301811/1-s2.0-S0167732215301811-main.pdf?_tid=d81b0a34-cc0b-11e5-ab40-00000aab0f02&acdnat=1454678874_07c7a33f64d06cb18d23688596ca1f2ehttp://hdl.handle.net/10204/8389https://www.sciencedirect.com/science/article/pii/S0167732215301811https://doi.org/10.1016/j.molliq.2015.06.044Copyright: 2016 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Journal of Molecular Liquids, vol. 211, pp 71-77Graphene oxide (GO) was functionalized with alpha cyclodextrin (aCD) through a covalent bond to form GO-aCD nanocomposites (NC). GO-aCD NC was further modified with polypyrrole (PPY) to afford an advanced GO-aCD-PPY NC for the removal of highly toxic Cr(VI) from water. The prepared GO-aCD-PPY NCs were successfully characterised with AT-FTIR, FE-SEM, HR-TEM, BET and XRD techniques. Adsorption experiments were performed in batch mode to determine optimum conditions that include temperature, pH, concentration of Cr(VI) and contact time. It was deduced from the experiments that the adsorption of Cr(VI) by the GO-aCD-PPY NC is pH and temperature dependent, where optimum adsorption was achieved at pH 2 and it increased with increasing temperature. The adsorption kinetics followed the pseudo-second-order model and the adsorption isotherms fitted well to the Langmuir isotherm model with maximum adsorption capacities ranging from 606.06 to 666.67 mg/g. Effect of co-existing ions studies revealed that cations and anions had no significant effect on the adsorption of Cr(VI). Desorption studies also illustrated that the NC can be re-used up to 3 cycles.enGraphene oxideNanocompositesPolypyrroleCyclodextrinCr(VI) removalArticleChauke, V., Maity, A., & Chetty, A. (2015). High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites. http://hdl.handle.net/10204/8389Chauke, VP, Arjun Maity, and A Chetty "High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites." (2015) http://hdl.handle.net/10204/8389Chauke V, Maity A, Chetty A. High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites. 2015; http://hdl.handle.net/10204/8389.TY - Article AU - Chauke, VP AU - Maity, Arjun AU - Chetty, A AB - Graphene oxide (GO) was functionalized with alpha cyclodextrin (aCD) through a covalent bond to form GO-aCD nanocomposites (NC). GO-aCD NC was further modified with polypyrrole (PPY) to afford an advanced GO-aCD-PPY NC for the removal of highly toxic Cr(VI) from water. The prepared GO-aCD-PPY NCs were successfully characterised with AT-FTIR, FE-SEM, HR-TEM, BET and XRD techniques. Adsorption experiments were performed in batch mode to determine optimum conditions that include temperature, pH, concentration of Cr(VI) and contact time. It was deduced from the experiments that the adsorption of Cr(VI) by the GO-aCD-PPY NC is pH and temperature dependent, where optimum adsorption was achieved at pH 2 and it increased with increasing temperature. The adsorption kinetics followed the pseudo-second-order model and the adsorption isotherms fitted well to the Langmuir isotherm model with maximum adsorption capacities ranging from 606.06 to 666.67 mg/g. Effect of co-existing ions studies revealed that cations and anions had no significant effect on the adsorption of Cr(VI). Desorption studies also illustrated that the NC can be re-used up to 3 cycles. DA - 2015-07 DB - ResearchSpace DP - CSIR KW - Graphene oxide KW - Nanocomposites KW - Polypyrrole KW - Cyclodextrin KW - Cr(VI) removal LK - https://researchspace.csir.co.za PY - 2015 SM - 0167-7322 T1 - High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites TI - High-performance towards removal of toxic hexavalent chromium from aqueous solution using graphene oxide-alpha cyclodextrin-polypyrrole nanocomposites UR - http://hdl.handle.net/10204/8389 ER -