Advanced Surface Molecular Engineering of Functional Lanthanum-Based Adsorbents for Phosphate Adsorption Performance

Résumé fourni par la source

Abstract Functional lanthanum-based adsorbents offer a promising strategy for addressing phosphate pollution in wastewater. Herein, porous layered lanthanum hydroxide (P-LHL) nanowire substrates were fabricated via a one-step hydrothermal strategy, and bovine serum albumin (BSA) was successfully anchored on the P-LHL surface through surface molecular engineering, yielding the BSA-modified composite (P-LHL@BSA). Modifying the lanthanum-based matrix with BSA not only increases the specific surface area, hydrophilicity, and positive surface charge of the materials but also enhances their affinity for phosphates. The optimized P-LHL@BSA exhibits excellent phosphate adsorption performance with an adsorption capacity of 172.06 mg g–1. The enhanced adsorption performance is attributed to the synergistic interaction between ligand exchange at the lanthanum hydroxide matrix and electrostatic attraction arising from the BSA-modified positively charged surface, which optimizes the internal Helmholtz plane and promotes phosphate adsorption efficiency. Notably, fixed-bed column experiments demonstrated that the breakthrough time of the modified nanowires was extended, while fabrication into a two-dimensional filtration membrane achieved a 100% removal efficiency for low-concentration phosphorus, underscoring the exceptional practicality of this modification approach. This study provides a feasible approach to the development of high-performance modified lanthanum-based adsorbents for phosphate removal and phosphorus resource recovery.