Antibacterial dynamic membranes loaded by cephalexin/amine-functionalized SBA_15 for Pb(II) ions removal

다국어 초록 (Multilingual Abstract)

Novel antibacterial dynamic membranes loaded by cephalexin/amine functionalized 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 3.5cm 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.

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