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Optimization of Influential Factors on the Photocatalytic Performance of TiO2–Graphene Composite in Degradation of an Organic Dye by RSM Methodology

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Abstract

Photocatalytic behavior was investigated for TiO2–graphene nanocomposite in the degradation of acid orange 7 (AO7) as a model pollutant under ultraviolet light in aqueous solution. XRD, SEM, TEM, DRS, FT-IR and EDX techniques were used for the characterization of the prepared nanocomposite. The effect of synthesis variables such as weight ratio of TiO2 to graphene and operational key factors such as initial dye concentration, irradiation time, catalyst dosage and solution distance from UV lamp were studied in the photocatalytic degradation of AO7. This excellent catalytic ability is mainly attributed to the synergic effect of photocatalyst and adsorbent. The effect of operational variables was optimized for the photocatalytic degradation of AO7 as a pollutant model using the RSM technique. In this case, the amount of the determination coefficient (R2 = 0.97) shows that 97% of the variability in the response could be described by the model. The maximum degradation efficiency (96%) was achieved at the optimum operational conditions: catalyst dosage of 0.5 g L−1, the irradiation time of 50 min and distance the solution from UV lamp of 0.3 cm.

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Acknowledgements

Authors are grateful to Council of University of Tehran and Center for International Scientific Studies Collaboration for providing financial support to undertake this work.

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Authors and Affiliations

  1. School of Chemistry, College of Science, University of Tehran, Tehran, Iran

    Farnosh Tavakoli, Alireza Badiei & Jahanbakhsh Ghasemi

  2. Department of Life Science Engineering, Faculty of New Science and Engineering, Tehran, Iran

    Fatemeh Yazdian

  3. Department of Chemistry, Alzahra University, Vanak Square, P.O. Box 1993893973, Tehran, Iran

    Ghodsi Mohammadi Ziarani

Authors
  1. Farnosh Tavakoli
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  2. Alireza Badiei
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  3. Fatemeh Yazdian
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  4. Ghodsi Mohammadi Ziarani
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  5. Jahanbakhsh Ghasemi
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Correspondence to Alireza Badiei.

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Tavakoli, F., Badiei, A., Yazdian, F. et al. Optimization of Influential Factors on the Photocatalytic Performance of TiO2–Graphene Composite in Degradation of an Organic Dye by RSM Methodology. J Clust Sci 28, 2979–2995 (2017). https://doi.org/10.1007/s10876-017-1250-9

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  • DOI: https://doi.org/10.1007/s10876-017-1250-9

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