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<p>Photocatalysis is widely acknowledged as an efficient technique for degrading a variety of pollutants, such as antibiotics, pesticides, herbicides, and microplastics. In this study, the micro-sized TiO<sub>2</sub> photocatalyst with the oxidizing agents (H<sub>2</sub>O<sub>2</sub>, periodate, and oxone) was investigated for the degradation of polyethylene (PE), polypropylene (PP), and sulfathiazole (STZ). Firstly, the photocatalytic activity of synthesized TiO<sub>2</sub> was evaluated by the decomposition of STZ (~ 94% within 30&#xa0;min), and then the microplastic degradation experiments were conducted. The changes before and after the experiment were characterized using SEM, FTIR, and XPS. The weight loss for PE under the different combinations of experiments was UV (0%), UV/TiO<sub>2</sub> (∼5.7%), UV/TiO<sub>2</sub>/H<sub>2</sub>O<sub>2</sub> (∼17%), UV/TiO<sub>2</sub>/Periodate (∼16%), and UV/TiO<sub>2</sub>/Oxone (∼13.4%). The PP globules (~ 4&#xa0;mm) did not have a significant impact on weight loss due to their large particle size and high rigidity. Meanwhile, PE showed improved weight loss due to a smaller particle size of ~ 20–100&#xa0;µm. SEM images confirmed the degradation of the PE was significant while only a few surface modifications can be observed for PP. FTIR analysis revealed changes in carbonyl groups of PE and PP, including ketones (1720&#xa0;cm<sup>−1</sup>), acids (1718&#xa0;cm<sup>−1</sup>), esters (1735&#xa0;cm<sup>−1</sup>), and vinyl groups (1650&#xa0;cm<sup>−1</sup>). The synergy between the oxidants and the photocatalyst unquestionably enhanced the oxidation of the microplastics.</p>

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Photocatalytic Degradation of Polyethylene, Polypropylene, and Sulfathiazole Using a UV/TiO2/Oxidant System

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Vikash Singh,
  • Seon Yeong Park,
  • Jun Ho Choi,
  • Chang Gyun Kim

摘要

Photocatalysis is widely acknowledged as an efficient technique for degrading a variety of pollutants, such as antibiotics, pesticides, herbicides, and microplastics. In this study, the micro-sized TiO2 photocatalyst with the oxidizing agents (H2O2, periodate, and oxone) was investigated for the degradation of polyethylene (PE), polypropylene (PP), and sulfathiazole (STZ). Firstly, the photocatalytic activity of synthesized TiO2 was evaluated by the decomposition of STZ (~ 94% within 30 min), and then the microplastic degradation experiments were conducted. The changes before and after the experiment were characterized using SEM, FTIR, and XPS. The weight loss for PE under the different combinations of experiments was UV (0%), UV/TiO2 (∼5.7%), UV/TiO2/H2O2 (∼17%), UV/TiO2/Periodate (∼16%), and UV/TiO2/Oxone (∼13.4%). The PP globules (~ 4 mm) did not have a significant impact on weight loss due to their large particle size and high rigidity. Meanwhile, PE showed improved weight loss due to a smaller particle size of ~ 20–100 µm. SEM images confirmed the degradation of the PE was significant while only a few surface modifications can be observed for PP. FTIR analysis revealed changes in carbonyl groups of PE and PP, including ketones (1720 cm−1), acids (1718 cm−1), esters (1735 cm−1), and vinyl groups (1650 cm−1). The synergy between the oxidants and the photocatalyst unquestionably enhanced the oxidation of the microplastics.