Synergistic oxygen vacancies and surface hydroxyl groups in NFM@γ-Al2O3 for enhanced catalytic ozonation of refractory organics and phosphorus in swine wastewater

文献类型： 外文期刊

第一作者： Xiao, Yanchun

作者： Xiao, Yanchun;Huang, Jing;Xu, Qingxian;Liu, Ruilai;Yang, Fang;Xie, Haijiao

作者机构：

关键词： Swine wastewater; Catalytic ozonation; Complexation; Oxygen vacancies; Surface hydroxyl groups; Biodegradability

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 378 卷

页码：

收录情况： SCI

摘要： Secondary swine wastewater effluent (SSWE) contains carbon and phosphorus residues, which are challenging to remove using conventional treatment methods owing to its low biochemical oxygen demand (BOD5) to chemical oxygen demand (CODCr) ratio (BOD5/CODCr, <0.001). Catalytic ozonation provides a promising advanced solution to this treatment challenge. In this study, NH4NO3-modified Fe-Mn oxide-loaded gamma-Al2O3 (NFM@gamma-Al2O3) was synthesized and applied for SSWE treatment. Under optimized conditions, the removal efficiencies of CODCr and total phosphorus (TP) reached 86.15 % and 95.98 %, respectively, while wastewater biodegradability improved by a factor of 136.5. Further characterization and density-functional-theory calculations revealed that the efficient co-removal of carbon and phosphorus in the O-3/NFM@gamma-Al2O3 system was driven by the synergistic effects of oxidation and complexation. Singlet oxygen (O-1(2)) and hydroxyl radicals (OH) generated at oxygen vacancy sites oxidized organic carbon compounds into low-molecular-weight products (including CO2, H2O). Moreover, the cleavage of C-P bonds facilitated the conversion of organic phosphorus into inorganic phosphate ions, thereby increasing their concentration. These phosphate ions were captured by surface hydroxyl groups at Fe active sites on NFM@gamma-Al2O3, forming Fe-O-P inner-sphere complexes via ligand exchange. Pilot-scale experiments confirmed that the treatment wastewater met discharge standards (GB 18596-2001). After 20 reuse cycles, the NFM@gamma-Al2O3 system maintained stable removal of 76.26 % CODCr and 87.35 % TP. Overall, NFM@gamma-Al2O3 exhibits high catalytic activity, strong complexation capacity, and excellent stability, making it highly effective for carbon and phosphorus removal in wastewater treatment.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序