Evaluating Photodegradation Performance of Phosphate Glass Doped with Titanium Dioxide for Water Remediation System
DOI:
https://doi.org/10.11113/jomalisc.v4.107Keywords:
phosphate glass, titanium dioxide, photodegradation, uv irradiation, methyl orangeAbstract
The purpose of this study is to prepare, characterize and to evaluate the photodegradation properties of TiO2-doped phosphate glass with a focus on its ability to degrade methyl orange (MO) dye under ultraviolet (UV) light. Phosphate glasses known for their versatility and bioactive properties were doped with different amounts of TiO2 (ranging from 0% to 1.0 mol%) to enhance their photodegradation performance. The glass samples were made using the melt-quenching technique and their structures were analyzed using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS). The XRD results showed that the TiO2 in the phosphate glass formed a semi-crystalline structure with the rutile phase being dominant. UV-Vis DRS analysis revealed a slight narrowing of the optical band gap as TiO2 content increased from 5.41 eV (0% TiO2) to 5.19 eV (1.0% TiO2). While this suggested improved photodegradation performance, the photodegradation tests showed an unexpected increase in absorbance for all samples rather than a decrease. This suggests that the photodegradation process was less efficient than anticipated with the increase in absorbance being especially pronounced in samples with higher TiO2 concentrations which had the highest absorbance at 1.059 a.u. at 506 nm. FTIR analysis confirmed that TiO2 was integrated into the phosphate glass matrix and formed Ti–O–P bonds. However, the presence of non-bridging oxygens and shifts in the P–O–P vibrations indicated that the TiO2 was not uniformly dispersed which could have hindered its photodegradation performance. Based on these results, the study concluded that the photodegradation efficiency of TiO2-doped phosphate glass could be significantly improved by optimizing the crystallinity of TiO2, adjusting the TiO2 doping levels and improving the dispersion of TiO2 within the glass matrix.
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