富含氧空位氧化镁微米棒选择性除磷性能与机理

胡启立; 庞舒月

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (2) : 776-786.

水污染与控制

富含氧空位氧化镁微米棒选择性除磷性能与机理

胡启立^1,2, 庞舒月²

作者信息 +

Selective phosphate removal of oxygen vacancy-rich magnesium oxide microrods: Performance and mechanism

HU Qi-li^1,2, PANG Shu-yue²

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文章历史 +

摘要

通过化学沉淀法耦合高温煅烧制备了富含氧空位氧化镁(OV-MgO)微米棒,探究了吸附剂投加量、溶液pH值以及共存离子和腐殖酸对其除磷特性的影响,采用吸附动力学和等温线模型分析了磷酸盐吸附的传质过程和平衡特性,并通过X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、电子顺磁共振(EPR)和X射线光电子能谱(XPS)等揭示了磷酸盐的吸附机理.结果表明, OV-MgO微米棒是一种介孔材料,总孔容为0.18cm³/g,在pH=3~6时具有良好的耐酸性.磷酸盐吸附受SO₄²⁻和HCO₃⁻离子的影响,但其吸附量仅分别下降了5.18%和4.67%,表现出极高的选择性.溶液中存在的NH₄⁺和Ca²⁺离子可通过形成鸟粪石晶体和磷酸钙沉淀促进磷酸盐吸附.磷酸盐在OV-MgO微米棒上吸附遵循分形伪一级动力学模型(Adj.R²=0.9979和RMSE=3.25). Vermeulen模型的拟合结果表明,颗粒内扩散是速率控制步骤.Langmuir等温线模型预测的最大吸附量为267.1mg/g (以PO₄³⁻-P计).磷酸盐吸附机理主要包括配体交换、表面沉淀和氧空位捕捉.

Abstract

Oxygen vacancy-rich magnesium oxide (OV-MgO) microrods were prepared through the combination of chemical precipitation method with high-temperature calcination. The effects of adsorbent dosage, pH values of the solution, coexisting ions and humic acid on the phosphate removal performance were explored. The adsorption kinetic and isotherm models were used to analyze the mass transfer process and the equilibrium characteristics of phosphate adsorption. X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR), electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) were adopted to reveal the phosphate adsorption mechanisms. The results indicated that OV-MgO microrod was a mesoporous material with a total pore volume of 0.18cm³/g, and had a good acid resistance. The phosphate adsorption was influenced by SO₄²⁻ and HCO₃⁻ ions, but its adsorption capacity only decreased by 5.18% and 4.67%, respectively, exhibiting an extremely high selectivity. NH₄⁺ and Ca²⁺ ions present in the solution contributed to the phosphate adsorption based on the formation of struvite crystals and calcium phosphate precipitates. The adsorption of phosphate on OV MgO nanorods followed the fractal-like pseudo-first-order kinetic model (Adj. R²=0.9979 and RMSE=3.25). The fitting result of the Vermeulen model indicated that the intraparticle diffusion was the rate-controlling step. The maximum adsorption capacity predicted by the Langmuir isotherm model was 267.1mg/g (as PO₄³⁻-P). The adsorption mechanisms of phosphate mainly included ligand exchange, surface precipitation and oxygen vacancy capture.

导出引用

胡启立, 庞舒月. 富含氧空位氧化镁微米棒选择性除磷性能与机理[J]. 中国环境科学. 2025, 45(2): 776-786

HU Qi-li, PANG Shu-yue. Selective phosphate removal of oxygen vacancy-rich magnesium oxide microrods: Performance and mechanism[J]. China Environmental Science. 2025, 45(2): 776-786

中图分类号： X703

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