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A series of nonmetal-doped titanium dioxide (Nm  x  /TiO 2 , where x is the weight fraction of nonmetal elements) photocatalysts was prepared via ultrasonic-assisted impregnation for simultaneous hydrogen (H 2 ) production and chemical oxygen demand (COD) removal from industrial wastewater. Three types of Nm elements, carbon (C), silicon (Si), and phosphorus (P), were explored. The P 1 /TiO 2 exhibited a higher photocatalytic activity for H 2 production and COD removal than the C 1 /TiO 2 and Si 1 /TiO 2 photocatalysts. Approximately 6.43 mmol/g photocatalyst of H 2 was produced, and around 26% COD removal was achieved at a P 1 /TiO 2 loading of 4.0 g/L, a light intensity of 5.93 mW/cm 2 , and a radiation time of 4 h. This is because the P 1 /TiO 2 photocatalyst exhibited lower point of zero charge values and a more appropriate band position compared with other Nm  x  /TiO 2 photocatalysts to produce H + , which can consequently form H 2 , and reactive oxygen species (HO · and O 2  ·  - ), which serve as oxidizing agents to degrade the organic pollutants. Increasing the content of the P element doped into the TiO 2 -based material up to 7.0% by weight enhanced the H 2 production and COD removal up to 8.34 mmol/g photocatalyst and 50.6%, respectively. This is attributed to the combined effect of the point of zero charge value and the S  BET of the prepared photocatalysts. The photocatalytic activity of the P 7 /TiO 2 photocatalyst was still higher than the TiO 2 -based material after the fourth use.

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Ultrasound-Assisted Synthesis of Nonmetal-Doped Titanium Dioxide Photocatalysts for Simultaneous H<sub>2</sub> Production and Chemical Oxygen Demand Removal from Industrial Wastewater

Ultrasound-Assisted Synthesis of Nonmetal-Doped Titanium Dioxide Photocatalysts for Simultaneous H2 Production and Chemical Oxygen Demand Removal from Industrial Wastewater

Ultrasound-Assisted Synthesis of Nonmetal-Doped Titanium Dioxide Photocatalysts for Simultaneous H₂ Production and Chemical Oxygen Demand Removal from Industrial Wastewater