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Phosphate removal from water using hydrated iron oxide/polyvinylidene
fluoride composite adsorption membranes

Authors： XU Qianhui, XIA Longbo, ZOU Dong, NIE Guangze

Units： School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China

KeyWords： phosphate; hydrous ferric oxide; composite membrane; adsorption; separation

ClassificationCode：TQ028

year,volume(issue):pagination： 2025,45(3):54-65

Abstract：

In this work, a composite adsorption membrane (HFO@PVDF) was fabricated to address phosphate removal in complex aqueous systems by embedding hydrous ferric oxide (HFO) nanoparticles into the pores of a polyvinylidene fluoride (PVDF) membrane using a simple blending method. This composite membrane integrates the outstanding chemical stability, high permeability, and porous structure of PVDF membrane with the unique phosphate affinity of HFO, resulting in superior phosphate removal capabilities. The study systematically investigated the effects of pH, reaction time, initial concentration, coexisting anions, and macromolecular organics on the phosphate removal efficiency of the HFO@PVDF membrane. Results demonstrated that the membrane exhibited high phosphate removal efficiency and selectivity. Static and dynamic cycle experiments confirmed its excellent regeneration capacity. Practical applicability was further validated through real-water simulations. At a pH of 6.5, the HFO@PVDF membrane achieved a treatment capacity of 130 L/m2 for synthetic water containing 2 mg/L of phosphate. Importantly, the membrane not only efficiently removed phosphates but also enabled simultaneous removal of heavy metals like Pb2+, while effectively retaining suspended solids on the membrane surface. These findings highlight the HFO@PVDF membrane's strong potential for advanced purification of phosphate-containing wastewater, offering a new approach for utilizing HFO nanoadsorbents in practical aquatic environments.

Funds：

国家自然科学基金面上项目（22476091）

AuthorIntro：

许千卉（2000-），女，江苏海安人，硕士研究生，研究方向为环境功能材料

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