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Efficient and Cost-effective Photoelectrochemical Degradation of Dyes in Wastewater over an Exfoliated Graphite-MoO3 Nanocomposite Electrode

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Abstract

Herein, we prepared hexagonal MoO3 (h-MoO3) nanorods by homogenous co-precipitation and utilized them to fabricate a composite h-MoO3-exfoliated graphite (EG) electrode. The above composite was characterized by scanning electron microscopy, Raman spectroscopy, X-ray diffraction, and UV-Vis spectroscopy, and used for the degradation of cationic (methylene blue, MB) and anionic (methyl red, MR) dyes in synthetic wastewater. The efficiency of this degradation was assessed by UV-Vis spectroscopy and electrochemical techniques. Good dispersion of h-MoO3 in EG decreased the electron-hole recombination rate and enhanced the photon absorption efficiency of the EG-MoO3 electrode, which therefore exhibited a higher dye photodegradation efficiency than the bare EG one. Specifically, the efficiencies of 180-min MB photodegradation over EG and EG-MoO3 electrodes were 66.9 and 88.55%, respectively, whereas the corresponding values for MR were 68.0 and 92.22%, respectively, i.e., MR was degraded more effectively than MB. Furthermore, photoelectrochemical oxidation was shown to be more efficient than purely photolytic and electrochemical oxidation, which, together with the ease of preparation, low cost, and high photoactivity/stability of the fabricated nanocomposite electrode makes it potentially suitable for industrial wastewater treatment.

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Funding

The study is financially supported by the National Centre for Nano-structured Materials, CSIR Pretoria, PDRF University of Johannesburg and National Research Foundation, South Africa.

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Authors and Affiliations

  1. Department of Applied Chemistry, University of Johannesburg, Doornfontein, 2028, South Africa

    Onoyivwe Monday Ama, Neeraj Kumar & Suprakas Sinha Ray

  2. DST/CSIR National Centre for Nano-structured Materials, Council for Scientific and Industrial Research, Pretoria, 0001, South Africa

    Onoyivwe Monday Ama & Suprakas Sinha Ray

  3. Department of Petroleum Chemistry, American University of Nigeria, Yola, Nigeria

    Feyisayo Victoria Adams

Authors
  1. Onoyivwe Monday Ama
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  2. Neeraj Kumar
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  4. Suprakas Sinha Ray
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Correspondence to Onoyivwe Monday Ama.

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Ama, O.M., Kumar, N., Adams, F.V. et al. Efficient and Cost-effective Photoelectrochemical Degradation of Dyes in Wastewater over an Exfoliated Graphite-MoO3 Nanocomposite Electrode. Electrocatalysis 9, 623–631 (2018). https://doi.org/10.1007/s12678-018-0471-5

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