Development of photocatalytic functional coatings via magnetron sputtering deposition and their integration into a laboratory-scale water treatment reactor
Abstract
Photocatalysis is an advanced oxidation process that only requires a photocatalyst, an appropriate light source and water to decompose a wide variety of pollutants. In recent years, it has been extensively studied for environmental wastewater treatment applications. Although promising, it has yet to be globally adopted, as it faces many challenges; namely cost, complexity and efficiency. To achieve this goal, two strategies have been employed in the A bismuth titanate composite photocatalyst was investigated as an alternative to the conventionally used titanium dioxide, to tackle the well-known drawbacks of fast chargecarrier recombination and low quantum efficiency of titania. Optimum deposition and annealing conditions were identified, to deposit bismuth titanate coatings by reactive magnetron sputtering. Bismuth titanate proved to be more efficient at decomposing methylene blue under UV light, with a pseudo first rate order constant of 1.40 and 0.52 (10-5 s-1) for bismuth titanate and titania coatings on glass substrates, respectively. Moreover, the reusability assessment of bismuth titanate thin films revealed an incremental performance increase after each consecutive test, leading to a 6-fold increase in photocatalytic activity. This behaviour was investigated by XPS and TRPL analysis and attributed to the formation of oxygen vacancies under UV irradiation. The oxygen vacancies-rich bismuth titanate was termed “black bismuth titanate” due to its dark colour, as opposed…
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