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<p>Industrial effluents containing organic pollutants pose environmental hazards. A promising approach for wastewater treatment involves the degradation of these pollutants through advanced oxidation processes (AOP). This research focused on the photodegradation of phenol under ultraviolet (UV) illumination using bare TiO<sub>2</sub> and SiO<sub>2</sub>/TiO<sub>2</sub> nanoparticles as photocatalysts with various ratios (20:80, 10:90, 5:95, 2.5:97.5, and 1.25:98.75. They were prepared using sol-gel method and characterized using XRD, BET, FESEM, EDX, FTIR, and AFM. This study marks the first use of SiO<sub>2</sub>/TiO<sub>2</sub> with a molar ratio of 2.5:97.5, and 1.25:98.75 for phenol removal, supported by a new photocatalytic reactor having high capabilities was locally designed and manufactured for experiments, providing illumination intensities ranging from 64 to 192&#xa0;W/m<sup>2</sup> and constant temperature. The unique innovative reactor enhances mass transfer and light distribution, improving the production of hydroxyl radicals necessary for effective degradation. The research examined phenol photodegradation in batch mode under UV light, revealing that the SiO<sub>2</sub>/TiO<sub>2</sub> composite achieved 97% degradation, surpassing the performance of bare TiO<sub>2</sub>, which reached 65% within 5&#xa0;h under similar conditions (SiO<sub>2</sub>:TiO<sub>2</sub> ratio of 2.5:97.5, catalyst concentration of 2&#xa0;g/L, pH of 3, initial phenol concentration of 100&#xa0;mg/L, and irradiation power of 24 × 8&#xa0;W-UVC). The efficiency of the TiO<sub>2</sub>/SiO<sub>2</sub> is 3.25 times better than bare TiO<sub>2</sub> for the first-order kinetic model. This study demonstrates the capabilities of the novel constructed photoreactor as a more efficient option for dealing with wastewater for industrial and ecological purposes, and aiding in the advancement of sustainable water use and environmental protection.</p>

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Effective Oxidation of Phenol Compound by Silica Oxide-Titanium Dioxide Photocatalyst in a Well-Designed Photocatalysis Reactor

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • Sarmad A. Rashid,
  • Wadood T. Mohammed

摘要

Industrial effluents containing organic pollutants pose environmental hazards. A promising approach for wastewater treatment involves the degradation of these pollutants through advanced oxidation processes (AOP). This research focused on the photodegradation of phenol under ultraviolet (UV) illumination using bare TiO2 and SiO2/TiO2 nanoparticles as photocatalysts with various ratios (20:80, 10:90, 5:95, 2.5:97.5, and 1.25:98.75. They were prepared using sol-gel method and characterized using XRD, BET, FESEM, EDX, FTIR, and AFM. This study marks the first use of SiO2/TiO2 with a molar ratio of 2.5:97.5, and 1.25:98.75 for phenol removal, supported by a new photocatalytic reactor having high capabilities was locally designed and manufactured for experiments, providing illumination intensities ranging from 64 to 192 W/m2 and constant temperature. The unique innovative reactor enhances mass transfer and light distribution, improving the production of hydroxyl radicals necessary for effective degradation. The research examined phenol photodegradation in batch mode under UV light, revealing that the SiO2/TiO2 composite achieved 97% degradation, surpassing the performance of bare TiO2, which reached 65% within 5 h under similar conditions (SiO2:TiO2 ratio of 2.5:97.5, catalyst concentration of 2 g/L, pH of 3, initial phenol concentration of 100 mg/L, and irradiation power of 24 × 8 W-UVC). The efficiency of the TiO2/SiO2 is 3.25 times better than bare TiO2 for the first-order kinetic model. This study demonstrates the capabilities of the novel constructed photoreactor as a more efficient option for dealing with wastewater for industrial and ecological purposes, and aiding in the advancement of sustainable water use and environmental protection.