A cerium-based metal organic framework adsorbent material Ce-MOF was prepared by solvothermal method,and then Ce-MOF-NH2 functional material for phosphorus removal was synthesized by incorporating amino groups to its basis.The physicochemical properties of Ce-MOF and Ce-MOF-NH2 were characterized using scanning electron microscopy (SEM),BET specific surface area analysis,thermogravimetric analysis (TG),infrared spectroscopy (FT-IR),X-ray photoelectron spectroscopy (XPS),and other analytical techniques.Regeneration experiments were conducted to investigate the adsorption and regeneration properties of both materials.Adsorption kinetics and isotherm models were employed to analyze the adsorption mechanism.The results revealed that at an initial pH of 3,the phosphate removal rates of Ce-MOF and Ce-MOF-NH2 reached 91.26% and 95.08%,respectively.Amino modification significantly increased the specific surface area by 72.7% to reach 856.985m2/g,while also increasing pore volume by 44.8%.Moreover,Ce-MOF-NH2 exhibited a higher overall collapse temperature (641℃) compared to Ce-MOF (585℃),indicating improved stability after amino modification.After five cycles of adsorption and regeneration,Ce-MOF-NH2 maintained a phosphate removal rate of 83.65%,which was 11.19% higher than that achieved by Ce-MOF alone.The adsorption kinetics for both materials followed a quasi-second-order model,while the Freundlich isotherm model accurately described their respective adsorption isotherms.Combined FT-IR and XPS analyses suggested that surface precipitation,ligand exchange,and electrostatic attraction contributed to the phosphorus removal mechanisms in both materials.The introduction of amino groups provided additional adsorption sites for the adsorption process of Ce-MOF-NH2 for phosphate,enhancing electrostatic attraction effects and ultimately improving its overall adsorption capacity.Ce-MOF-NH2 demonstrated promising potential as a technical solution for efficient phosphorus removal in urban wastewater treatment plants under high emission standard.
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基金资助
辽宁省教育厅重点攻关项目(LJKZZ20220081)
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