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<p>TiO<sub>2</sub> was immobilized on a polypropylene polyhedral (PP) ball using polyamide (PA) hot melt adhesive to generate floating photocatalyst TiO<sub>2</sub>-PA/PP with high photocatalytic activity, which was further coupled with denitrification biofilm to form TiO<sub>2</sub>-PA/PP biofilm system. The analysis of SEM, EDS, XRD, and FTIR confirmed that TiO<sub>2</sub> was immobilized on the surface of PP without any changes in the crystal structure of TiO<sub>2</sub>. The photocatalytic experiments showed that the degradation efficiencies of p-phenylenediamine, sucrose, humic acid, and bovine albumin by TiO<sub>2</sub>-PA/PP were 58.3%, 48.0%, 97.1%, and 66.6%, respectively. •O<sub>2</sub><sup>−</sup> and h<sup>+</sup> were the key reactive oxygen species (ROSs) in photocatalytic degradation of organic matter in the TiO<sub>2</sub>-PA/PP system under solar irradiation. In the synthetic water, 95.5% humic acid and 43.2% nitrate were simultaneously removed in TiO<sub>2</sub>-PA/PP biofilm reactor, confirming the coupling of photocatalytic degradation and denitrification. In the actual micro-polluted surface water, the coupling photocatalytic and biofilm reactor reduced chemical oxygen demand (COD) by 68.4% and nitrate by 38.9% in 480&#xa0;min. This study provided a new option for the in-situ removal of organic matter and nitrate from micro-polluted surface water.&#xa0;&#xa0;</p> Graphical Abstract <p></p>

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Coupling of titanium dioxide loaded carrier and denitrification biofilm for the advanced treatment of micro-polluted water

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Kaige Hou,
  • Qianwen Song,
  • Jiaojiao Xu,
  • Xinghao Ren,
  • Yulan Wang,
  • Shoujun Yuan,
  • Wei Wang,
  • Zhen-Hu Hu

摘要

TiO2 was immobilized on a polypropylene polyhedral (PP) ball using polyamide (PA) hot melt adhesive to generate floating photocatalyst TiO2-PA/PP with high photocatalytic activity, which was further coupled with denitrification biofilm to form TiO2-PA/PP biofilm system. The analysis of SEM, EDS, XRD, and FTIR confirmed that TiO2 was immobilized on the surface of PP without any changes in the crystal structure of TiO2. The photocatalytic experiments showed that the degradation efficiencies of p-phenylenediamine, sucrose, humic acid, and bovine albumin by TiO2-PA/PP were 58.3%, 48.0%, 97.1%, and 66.6%, respectively. •O2− and h+ were the key reactive oxygen species (ROSs) in photocatalytic degradation of organic matter in the TiO2-PA/PP system under solar irradiation. In the synthetic water, 95.5% humic acid and 43.2% nitrate were simultaneously removed in TiO2-PA/PP biofilm reactor, confirming the coupling of photocatalytic degradation and denitrification. In the actual micro-polluted surface water, the coupling photocatalytic and biofilm reactor reduced chemical oxygen demand (COD) by 68.4% and nitrate by 38.9% in 480 min. This study provided a new option for the in-situ removal of organic matter and nitrate from micro-polluted surface water.  

Graphical Abstract