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Graft Gum Ghatti Caped Cu2O Nanocomposite for Photocatalytic Degradation of Naphthol Blue Black Dye

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Abstract

Photodecolorization of naphthol blue black dye through the use of Cu2O nanoparticles capped with a biopolymer matrix containing gum ghatti (Gg) grafted with acrylic acid (AA) and acrylamide (AAm) (Cu2O/Gg–AAm–AA) has been studied. While the homogeneous co-precipitation method was adopted for the synthesis of the Cu2O nanoparticle, its incorporation into the biopolymer matrix (Gg–AAm–AA) was performed through the graft copolymerization method. The synthesized Cu2O and Cu2O/Gg–AAm–AA were characterized using SEM, TEM, XRD, EDX and UV–Vis spectroscopies, and BET surface area analysis. The photodecolorization experiment was performed using simulated ultraviolet and visible light irradiations, and these results compared with that of adsorption studies. The influence of pH, catalyst dose and dye concentration on the decolorization efficiency were also taken into consideration. The results revealed the Cu2O/Gg–AAm–AA to be an excellent photocatalyst for effective elimination of naphthol blue black dye from water. The process was observed to be pH dependent, with pH 6 being the optimum value. The photodecolorization process increased with increasing catalyst concentration but decreased beyond the optimum value of 0.3 g L−1. The process also decreased with increasing dye concentration. The result of the recyclability study indicates that the Cu2O/Gg–AAm–AA nanocomposite can be effectively recycled and re-used over a number cycles.

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Acknowledgements

The authors appreciate the financial contributions made by the Faculty of Science, University of Johannesburg, South Africa, National Research Foundation (TTK14052167682) and Water Research Commission of South Africa toward this work.

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Authors and Affiliations

  1. Department of Applied Chemistry, University of Johannesburg, P.O. Box 17011, Doornfontein 2028, Johannesburg, South Africa

    William Wilson Anku, Sudheesh Kumar Shukla & Poomani Penny Govender

  2. Department of Biomedical Engineering, Ben-Gurion University of the Negev, Beersheba, 8410501, Israel

    Sudheesh Kumar Shukla

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  1. William Wilson Anku
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  2. Sudheesh Kumar Shukla
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  3. Poomani Penny Govender
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Correspondence to William Wilson Anku.

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Anku, W.W., Shukla, S.K. & Govender, P.P. Graft Gum Ghatti Caped Cu2O Nanocomposite for Photocatalytic Degradation of Naphthol Blue Black Dye. J Inorg Organomet Polym 28, 1540–1551 (2018). https://doi.org/10.1007/s10904-018-0875-y

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  • DOI: https://doi.org/10.1007/s10904-018-0875-y

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