In this study, a biopolymer-based adsorptive membrane was designed for simultaneous removal of differently charged heavy metals from water. Polylactic acid (PLA)/hydroxyapatite (HAp) adsorptive membranes with various content of HAp were fabricated using the non-solvent induced phase separation method. The effect of incorporating different weight content of HAp ranging from 0 to 3.0 wt% was studied on the structural morphology, hydrophilicity, porosity, mechanical properties, pure water permeability, and lead (Pb) and arsenic (As) adsorption capacity of the fabricated membranes. The results revealed that adsorptive membrane with 2.5 wt% HAp exhibited high porosity and hydrophilicity, acceptable mechanical strength, and ultrahigh pure water flux (1100 L m⁻² h⁻¹). This membrane showed proper removal efficiency in batch adsorption, 97% for Pb and 82% for As solutions (100 ppb), which are comparable to most of the readily available adsorbents. Dynamic adsorption results divulged that the adsorptive membrane with 2.5 wt% HAp content provided a promising filtrate of Pb and As solutions with a concentration below 10 ppb for even four and five consequent regeneration cycles. Additionally, the adsorptive performance of the optimum HAp content membrane was better than batch adsorption, especially in Pb removal.

在这项研究中，设计了一种基于生物聚合物的吸附膜，用于同时去除水中不同带电的重金属。使用非溶剂诱导相分离方法制备了具有各种 HAp 含量的聚乳酸 (PLA)/羟基磷灰石 (HAp) 吸附膜。研究了 0 至 3.0 wt% 不同重量含量的 HAp 对制备的膜的结构形态、亲水性、孔隙率、机械性能、纯水渗透率以及铅 (Pb) 和砷 (As) 吸附能力的影响. 结果表明，含 2.5 wt% HAp 的吸附膜具有高孔隙率和亲水性、可接受的机械强度和超高纯水通量 (1100 L m ^-2  h ^-1）。该膜在批量吸附中显示出适当的去除效率，对 Pb 为 97%，对 As 溶液 (100 ppb) 为 82%，与大多数现成的吸附剂相当。动态吸附结果表明，具有 2.5 wt% HAp 含量的吸附膜为浓度低于 10 ppb 的 Pb 和 As 溶液提供了有希望的滤液，甚至可以用于随后的 4 和 5 次再生循环。此外，最佳HAp含量膜的吸附性能优于批量吸附，尤其是在Pb去除方面。