Effect of Different Mole Ratios of ZnO:TiO2 Powders on the Photocatalytic Activity under Ultraviolet-A Light
Conference proceedings article
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Author list: Chaikan Wisetsing, Krisana Kobwittaya, Sanya Sirivithayapakorn
Publication year: 2020
Start page: 441
End page: 448
Number of pages: 8
Languages: Thai (TH)
Abstract
Mixed-metal oxides photocatalyst, which was prepared using the combination of zinc oxide (ZnO)
and titanium dioxide (TiO2) via solid-state reaction method, was employed in photocatalytic process for
challenging the efficiency and photocatalytic activity of treating Rhodamine B -contaminated synthetic
wastewater under the presence of UV-A light excitation source. Removal efficiency of the system was
investigated by considering the use of photocatalysts with different mole ratios of ZnO to TiO2, and evaluating the change in absorbance (Abs) and total organic carbon (TOC) values compared with reaction time. The experimental results showed that, with the reaction time of 60 minutes, when using mixed-metal oxides photocatalyst with the mole ratio of ZnO to TiO2 equal to 0.75 to 1 (0.75ZnO-TiO2), color removal efficiency was 100%, while the efficiency of decreasing total organic carbon was in the range of 35% to 50% when xZnO-TiO2 (x ≥ 1) photocatalysts were employed. Taking into account the case of using TiO2 photocatalyst singly, it was found that color and total organic carbon removal efficiencies were 70% and 20%, respectively. Therefore, using mixed-metal oxides photocatalyst could increase the performance of photocatalytic process higher than operating through single-component photocatalyst. Additionally, considering the capability of decreasing total organic carbon via photocatalytic process, it is found that the limitation of removing total organic carbon using this process is still valid.
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