Novel antibacterial dynamic membranes loaded by cephalexin/amine fiinctionalized SBA_15 were fabricated for heavy metal removal from aqueous solution. The mesoporous CPX/NH2-SBA_15 nanocomposite was formed as a uniform adsorptive and hydrophilic layer on the ultrafiltration polymeric membrane (PVDF). The modified adsorbent and membranes were characterized by SEM, XRD, N2 adsorption-desorption analysis, FT-IR, TGA, DSC and contact angle. A number of qualitative (well diffusion, disk diffusion) antibacterial assays were conducted against grampositive S. aureus and gram-negative E. coli. In addition, to evaluate its anti-biofouling performance, the model concentrated bacteria suspension in liquid medium was used as a feed solution. 100% bacteria mortality for certain concentration and suitable inhibition zones up to 3.5 cm were attained. An increment in the flux recovery from 55% (for UF) to 87% (for self-forming dynamic membrane (DM)) and 91% (for pre-coated DM) indicated that the dynamic layer improved the anti-biofouling property of the support membrane. High Pb(II) removal efficiency (99.8%) was achieved for the modified membrane during dynamic filtration test. CPX/NH2/SBA-15 dynamic membrane showed higher Pb2+ rejection than SBA-15 dynamic membrane because of amine groups located on the adsorbent surface. In general, membranes provide good performance like better flux and rejection besides antibacterial and anti-biofouling behavior.

中文翻译：

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由头孢氨苄/胺功能化 SBA_15 负载的抗菌动态膜用于去除 Pb(II) 离子

制备了由头孢氨苄/胺功能化的 SBA_15 负载的新型抗菌动态膜，用于去除水溶液中的重金属。介孔 CPX/NH2-SBA_15 纳米复合材料在超滤聚合物膜 (PVDF) 上形成均匀的吸附和亲水层。通过SEM、XRD、N2吸附-解吸分析、FT-IR、TGA、DSC和接触角对改性后的吸附剂和膜进行了表征。对革兰氏阳性金黄色葡萄球菌和革兰氏阴性大肠杆菌进行了许多定性（孔扩散、圆盘扩散）抗菌试验。此外，为了评估其抗生物污垢性能，将模型在液体培养基中的浓缩细菌悬浮液用作进料溶液。达到一定浓度的 100% 细菌死亡率和高达 3.5 cm 的合适抑菌圈。通量回收率从 55%（超滤）增加到 87%（自成型动态膜（DM））和 91%（预涂 DM）表明动态层提高了膜的抗生物污染性能。支撑膜。在动态过滤测试期间，改性膜实现了高 Pb(II) 去除效率 (99.8%)。CPX/NH2/SBA-15 动态膜表现出比 SBA-15 动态膜更高的 Pb2+ 截留率，因为胺基团位于吸附剂表面。一般而言，除抗菌和抗生物污损行为外，膜还提供良好的性能，例如更好的通量和截留率。在动态过滤测试期间，改性膜达到了 8%)。CPX/NH2/SBA-15 动态膜表现出比 SBA-15 动态膜更高的 Pb2+ 截留率，因为胺基团位于吸附剂表面。一般而言，除抗菌和抗生物污损行为外，膜还提供良好的性能，例如更好的通量和截留率。在动态过滤测试期间，改性膜达到了 8%)。CPX/NH2/SBA-15 动态膜表现出比 SBA-15 动态膜更高的 Pb2+ 截留率，因为胺基团位于吸附剂表面。一般而言，除抗菌和抗生物污损行为外，膜还提供良好的性能，例如更好的通量和截留率。