College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua, 321004, PR China.
Chemosphere. 2020 Mar;243:125446. doi: 10.1016/j.chemosphere.2019.125446. Epub 2019 Nov 25.
Multiple wall carbon nanotubes (MWCNTs), as an excellent material, have been used in various applications including preparation of polymer-MWCNTs composite membranes. However, few reports have combined the magnetic Ni@MWCNTs with polyether sulfone (PES) membrane to improve its antifouling performance to humic acid (HA), sodium alginate (SA), bovine serum albumin (BSA) and yeast (YE) solutions. In this study, the Ni@MWCNTs was generated by immersing MWCNTs into Ni solution where in-situ reduction reaction was launched by the adsorbed Ag on MWCNTs. Since the loaded Ni endowed magnetism to MWCNTs, the Ni@MWCNTs can be easily attracted onto the membrane surface by an external magnetic field during the phase inversion process. The morphology measurements confirmed that the Ni@MWCNTs headed out of the PES-Ni@MWCNTs membrane surface. Because the MWCNTs played a role of free channels for water molecules, the composite membrane water flux reached to threefold flux of the pristine membrane. Moreover, the PES-Ni@MWCNTs membranes displayed the obviously enhanced antifouling ability during all the three alternative filtration cycles of water and BSA, SA, YE and HA solutions. In addition, the optimal PES-Ni@MWCNTs membrane demonstrated a flux recovery rate (FRR) of 67.89%, 85.53%, 60.28 and 90.12% for BSA, SA, YE and HA, respectively, which were not only much higher than that of the pristine membrane, but also exhibited significant improvements comparing with the previous studies. Further results of extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory indicated that the modified membrane possessed advantageous interaction energies with contaminant molecules over the pristine membrane.
多壁碳纳米管（MWCNTs）作为一种优异的材料，已被广泛应用于各种领域，包括制备聚合物-MWCNTs 复合膜。然而，将磁性 Ni@MWCNTs 与聚醚砜（PES）膜结合以提高其对腐殖酸（HA）、海藻酸钠（SA）、牛血清白蛋白（BSA）和酵母（YE）溶液的抗污染性能的研究却很少。在本研究中，MWCNTs 被浸入 Ni 溶液中，通过 MWCNTs 上吸附的 Ag 引发原位还原反应，生成 Ni@MWCNTs。由于负载的 Ni 赋予 MWCNTs 磁性，因此在相转化过程中，Ni@MWCNTs 可以在外磁场的作用下很容易地被吸引到膜表面上。形貌测量证实，Ni@MWCNTs 从 PES-Ni@MWCNTs 膜表面突出。由于 MWCNTs 充当水分子的自由通道，复合膜的水通量达到原始膜通量的三倍。此外，在水和 BSA、SA、YE 和 HA 溶液的三个交替过滤循环中，PES-Ni@MWCNTs 膜均表现出明显增强的抗污染能力。此外，优化后的 PES-Ni@MWCNTs 膜对 BSA、SA、YE 和 HA 的通量恢复率（FRR）分别达到 67.89%、85.53%、60.28%和 90.12%，不仅远高于原始膜，而且与之前的研究相比也有显著的提高。进一步的扩展德加古因-兰德沃维尔-奥弗贝克（XDLVO）理论结果表明，改性膜与污染物分子之间具有有利的相互作用能，优于原始膜。
