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<p>Rapid industrialization and urbanization are polluting water supplies due to release of untreated wastewater in water bodies. Rhodamine B (RhB) is one of the commonly found pollutants in wastewater. In this study, dual-photoelectrode Photocatalytic Fuel Cell (PFC) prepared from ZnO/TiO<sub>2</sub> photoanode and Cu<sub>2</sub>O/CuO photocathode is used with Taguchi’s standard L16 Orthogonal Array to optimise RhB degradation and electricity generation. X-ray diffraction, field emission-scanning electron microscopes, energy dispersive X-ray and ultraviolet–visible diffuse reflectance spectroscopy are used for characterization of photoelectrodes. Analysis of mean revealed the maximum RhB removal of 91.77% and power density of 297.81 µA&#xa0;cm<sup>−2</sup> at pH 8, 44 W light-intensity, two number of TiO<sub>2</sub> layers, 550&#xa0;°C calcination temperature and 300&#xa0;min irradiation-time. While analysis of variation determined the percentage contribution of each process parameter in descending order for RhB degradation as pH &gt; irradiation time &gt; calcination temperature &gt; number of TiO<sub>2</sub> layers on photoanode &gt; light intensity. Kinetics study indicated that RhB degradation followed pseudo-first order model (kinetic constant = 0.0085&#xa0;min<sup>−1</sup>) at optimum conditions. While short-circuit current density (J<sub>sc</sub>), open-circuit voltage (V<sub>oc</sub>) and maximum power (P<sub>max</sub>) were 283.64 µA&#xa0;cm<sup>−2</sup>, 945.63&#xa0;mV and 297.81&#xa0;µW&#xa0;cm<sup>−2</sup>, respectively. Stability analysis revealed excellent stability of photoelectrodes for RhB degradation by 4th cycle, confirming reusability of photoelectrodes in PFC.</p>

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Taguchi’s optimization of process parameters for effective degradation of Rhodamine B and energy harvesting through photocatalytic fuel cell with dual photoelectrodes

  • 期刊论文

  • 发表日期：

    2025年2月5日

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  • Vaidehi G. Sonone,
  • Ajay R. Tembhurkar

摘要

Rapid industrialization and urbanization are polluting water supplies due to release of untreated wastewater in water bodies. Rhodamine B (RhB) is one of the commonly found pollutants in wastewater. In this study, dual-photoelectrode Photocatalytic Fuel Cell (PFC) prepared from ZnO/TiO2 photoanode and Cu2O/CuO photocathode is used with Taguchi’s standard L16 Orthogonal Array to optimise RhB degradation and electricity generation. X-ray diffraction, field emission-scanning electron microscopes, energy dispersive X-ray and ultraviolet–visible diffuse reflectance spectroscopy are used for characterization of photoelectrodes. Analysis of mean revealed the maximum RhB removal of 91.77% and power density of 297.81 µA cm−2 at pH 8, 44 W light-intensity, two number of TiO2 layers, 550 °C calcination temperature and 300 min irradiation-time. While analysis of variation determined the percentage contribution of each process parameter in descending order for RhB degradation as pH > irradiation time > calcination temperature > number of TiO2 layers on photoanode > light intensity. Kinetics study indicated that RhB degradation followed pseudo-first order model (kinetic constant = 0.0085 min−1) at optimum conditions. While short-circuit current density (Jsc), open-circuit voltage (Voc) and maximum power (Pmax) were 283.64 µA cm−2, 945.63 mV and 297.81 µW cm−2, respectively. Stability analysis revealed excellent stability of photoelectrodes for RhB degradation by 4th cycle, confirming reusability of photoelectrodes in PFC.