School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, 200093, China.
School of Computer Engineering and Science, Shanghai University, Shanghai, 200444, China.
Chemosphere. 2024 Sep;363:142831. doi: 10.1016/j.chemosphere.2024.142831. Epub 2024 Jul 10.
The common polyvinylidene fluoride (PVDF) membrane itself is susceptible to membrane fouling, especially biofouling, which is a serious threat. In this study, PVDF membrane was modified with ciprofloxacin (CIP) through co-blending to investigate the filtration properties, bacterial inhibition and fouling resistance. Modified membranes were prepared by adding 0.3 g (M), 0.6 g (M), 0.9 g (M) and 1.2 g (M) CIP per 100 g casting solution. Among these modified membranes, M showed the best filtration performances, with the pure water flux stabilized at about 416.67 L/(m·h) and bovine serum albumin (BSA) rejection of 92.0% at a trans-membrane pressure of 0.1 MPa. The pore size was reduced, the average roughness was reduced to 29.4 nm, the contact angle was lowered to 68.9°, and the hydrophilicity was greatly improved. The width of the inhibition circle produced by M was 0.35-0.45 mm, and the modified membrane showed good inhibition of non-specific bacteria and algal removal during urban river water filtration. The rejection of BSA was increased by 16.32% compared to the base membrane and the adsorption rate for BSA was reduced by 68.45%. In addition, the removal of conventional pollutants in urban river water by the modified membranes for was also improved. Compared with that of the base membrane, the removal of TN, NH-N, TP and COD by M was increased by 10.58%, 12.45%, 15.44% and 13.53%. The results showed that CIP co-blending modified PVDF membrane could effectively improve membrane performances and has good value for water treatment.
常见的聚偏氟乙烯（PVDF）膜本身易受膜污染，尤其是生物污染，这是一个严重的威胁。在这项研究中，通过共混将环丙沙星（CIP）改性 PVDF 膜，以研究过滤性能、抑菌和抗污染性。通过向每 100g 铸膜液中添加 0.3g（M）、0.6g（M）、0.9g（M）和 1.2g（M）CIP 制备改性膜。在这些改性膜中，M 表现出最好的过滤性能，纯水通量在 0.1MPa 跨膜压力下稳定在约 416.67L/（m·h），牛血清白蛋白（BSA）截留率为 92.0%。孔径减小，平均粗糙度降低至 29.4nm，接触角降低至 68.9°，亲水性大大提高。M 产生的抑菌圈宽度为 0.35-0.45mm，改性膜在城市河水过滤过程中对非特异性细菌和藻类去除具有良好的抑制作用。与基膜相比，BSA 的截留率提高了 16.32%，BSA 的吸附率降低了 68.45%。此外，改性膜对城市河水常规污染物的去除也得到了提高。与基膜相比，M 对 TN、NH-N、TP 和 COD 的去除率分别提高了 10.58%、12.45%、15.44%和 13.53%。结果表明，CIP 共混改性 PVDF 膜可以有效改善膜性能，在水处理方面具有很好的应用价值。
