College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China; Key Laboratory of Bio-based Materials Science & Technology, Ministry of Education, Northeast Forestry University, Harbin 150040, PR China.
College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, PR China.
Int J Biol Macromol. 2020 Oct 1;160:652-659. doi: 10.1016/j.ijbiomac.2020.05.223. Epub 2020 May 30.
In this contribution, a novel cellulose acetate modified with dopamine (CA-DA) membrane material was designed and prepared by a two-step route consist of chlorination and further substitution reactions. The chemical structure of the prepared CA-DA material was determined by FTIR and H NMR, respectively. The CA-DA ultrafiltration membrane was subsequently fabricated by the scalable phase inversion process. Compared with cellulose acetate membrane as the control sample, the introduction of dopamine improved the porosity, pore size and hydrophilicity of the CA-DA membrane, which was helpful to the water permeability (181.2 L/mh) without obviously affecting the protein rejection (93.5%). According to the static protein adsorption and dynamic cycle ultrafiltration experiments, the CA-DA membrane displayed persistent antifouling performance, which was verified by flux recovery ratio, flux decline ratio and filtration resistance. Moreover, the water flux recovery ratio of the CA-DA membrane was retained at 97.3% after three-cycles of BSA solution filtration, which was much higher than that of the reference CA membrane. This new approach provided a long life and excellent ultrafiltration performance for polymer-based membranes, which has potential application prospects in the field of separation process.
在本研究中，设计并制备了一种新型的多巴胺改性醋酸纤维素（CA-DA）膜材料，采用两步法制备，包括氯化和进一步取代反应。通过傅里叶变换红外光谱（FTIR）和核磁共振氢谱（H NMR）分别确定了制备的 CA-DA 材料的化学结构。随后，通过可扩展的相转化工艺制备了 CA-DA 超滤膜。与作为对照样品的醋酸纤维素膜相比，多巴胺的引入提高了 CA-DA 膜的孔隙率、孔径和亲水性，有助于水通量（181.2 L/mh）的提高，而对蛋白质截留率（93.5%）没有明显影响。根据静态蛋白质吸附和动态循环超滤实验，CA-DA 膜表现出持久的抗污染性能，通过通量恢复率、通量下降率和过滤阻力得到验证。此外，CA-DA 膜在三次 BSA 溶液过滤后，水通量恢复率保持在 97.3%，远高于参考 CA 膜。这种新方法为基于聚合物的膜提供了更长的使用寿命和优异的超滤性能，在分离过程领域具有潜在的应用前景。
