Institute of Environmental Science and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
School of Chemical and Materials Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan.
Environ Technol. 2020 Dec;41(28):3657-3669. doi: 10.1080/09593330.2019.1617355. Epub 2019 May 23.
Modification of active membrane surface is an auspicious way to enhance the membrane performance. In our study, a commercially available composite polyamide Nanofiltration (NF) membrane was modified by immobilizing silver doped TiO (Ag-TiO) nanoparticles. Ag-TiO with different nanoparticles concentration (0.05, 0.1, and 0.5 wt. %) were coated on the surface of the membrane by a dip coating method. The evidence of successful coating was evaluated by Scanning Electron Microscopy coupled with Energy Dispersive Spectroscopy and Atomic Force Microscopy images. Moreover, the Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR), contact angle measurement and permeation tests were carried out in order to evaluate the membrane performance after coating. The antifouling property of the modified membrane was evaluated for Gram-positive () and Gram-negative () bacteria by colony counting method. The results indicated that the modified membranes keep efficient antibacterial efficacy against both types of bacteria. The bacterial growth reduced approximately 93% and 91% on the modified membrane as compared to the unmodified membrane for and , respectively. Ag-TiO nanoparticles imbedded nanofiltration membranes inhibit the biofilm formation and facilitate in cleaning membrane surface without using excessive chemical agents.
改性活性膜表面是提高膜性能的一种有效方法。在我们的研究中，通过将掺银 TiO（Ag-TiO）纳米粒子固定在商业上可用的复合聚酰胺纳滤（NF）膜上来对其进行改性。采用浸涂法将不同浓度（0.05、0.1 和 0.5wt.%）的 Ag-TiO 纳米粒子涂覆在膜的表面。通过扫描电子显微镜结合能谱和原子力显微镜图像评估了成功涂覆的证据。此外，还进行了衰减全反射傅里叶变换红外光谱（ATR-FTIR）、接触角测量和渗透测试，以评估涂覆后的膜性能。通过菌落计数法评估了改性膜对革兰氏阳性（）和革兰氏阴性（）细菌的抗污染性能。结果表明，与未改性膜相比，改性膜对两种类型的细菌均保持高效的抗菌功效。与未改性膜相比，改性膜上的细菌生长分别减少了约 93%和 91%。嵌入了 Ag-TiO 纳米粒子的纳滤膜可以抑制生物膜的形成，并有助于在不使用过量化学试剂的情况下清洁膜表面。
