The Influence of Doping Concentration on Photocatalytic Activity of Bismuth-Doped Titanium (IV) Oxide
Keywords:
TiO2, Bi doped TiO2, sol-gel, photocatalytic activityAbstract
Titanium (IV) Oxides (TiO2) have been widely studied for photocatalytic applications due to their excellent electrical and optical properties. It has a band gap of 3.0 – 3.2eV and can be excited by ultraviolet (UV) light. Although TiO2 has been researched to be an efficient photocatalyst material by many researchers, its wide band gap limits its absorption of light into the UV portion of the electromagnetic spectrum. In this work, we reported a straightforward Sol-gel approach to synthesize both undoped and Bismuth (Bi) doped TiO2 in order to investigate the photocatalytic activity of Bi-TiO2. Various characterization methods, including XRD, FTIR, and DRS, were employed to investigate how the doping concentration of Bi affected the optical and structural characteristics of TiO2. From the results, the XRD spectrum indicated the tetragonal structure corresponding to the anatase phase of TiO2. DRS reveals that there is a slight decrease in the energy band gap for the sample from 3.23 eV – 3.15 eV as the concentration of Bi increases. The degradation of methylene blue and methylene orange through photocatalysis was used to examine the samples' photocatalytic activity. The outcomes of the photocatalytic activity showed that the undoped TiO2 has a better photocatalytic degradation percentage of 89.27% and 58.19% for Methylene blue and Methylene orange, respectively when compared with the Bi-TiO2 samples.
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