数字农科院2.0

Efficient recovery of high-concentration phosphorus from livestock wastewater: combined effects of magnesium-based metal-organic framework-derived metal oxide morphology and magnesium oxide different vacancie species

文献类型： 外文期刊

作者： Tian Yuan;Shiyu Lv;Xueyan Zhang;Yuan Luo;Menghan Feng;Weilin Fu;Pu Yang;Kerong Fu;Yanli Luo;Yanzhuan Cao;Feng Wang

作者机构：

关键词： DFT;Mg vacancy;MgO;MOFs sacrificial template;O vacancy;Phosphate recovery

期刊名称： Separation and Purification Technology

ISSN： 1383-5866

年卷期： 2025 年 374 卷

页码：

收录情况： SCIE（2025版） ; ; EI（2025版）

摘要： Livestock wastewater causes severe pollution because of its high phosphorus concentration and difficult treatment process. For efficient phosphate recovery, different organic ligands are calcined herein using the metal-organic framework (MOF) template sacrificial method to synthesize nano-magnesium oxides (MgOs) with varying morphologies, pore structures, and vacancie concentrations (oxygen vacancy and Mg vacancy). 2,5-Dihydroxyterephthalic acid (DHTA)-MgO, 1,3,5-benzenetricarboxylic acid (H3BTC)-MgO, and adipic acid (AA)-MgO primarily rely on chemical adsorption, supplemented by physical adsorption. AA-MgO exhibits an adsorption capacity of 323.9 mg P/L for phosphate at pH 8, which is 3.89 and 1.09 times higher than those of DHTA-MgO and H3BTC-MgO. X-ray photoelectron spectroscopy, electron paramagnetic resonance spectroscopy, and density functional theory calculations (DFT) confirm that the main mechanisms involved in phosphate adsorption are ligand exchange, intraspherical complexation, and electrostatic attraction. Moreover, the main phosphate adsorption sites on AA-MgO are oxygen vacancy, Mg, and Mg vacancy. When the inorganic phosphorus concentration = 38.39 ± 0.2 mg P/L, AA-MgO dosage = 1.2 g/L, the removal rate of phosphate in livestock wastewater reaches 100 %. Thus, the proposed method can be beneficial for improving the quality of acidic water bodies. This study provides a new approach for phosphate removal from livestock wastewater.

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