Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China E-mail:
The Institute of Seawater Desalination and Multipurpose Utilization, MNR(Tianjin), Tianjin 300192, China.
Water Sci Technol. 2019 May;79(9):1821-1832. doi: 10.2166/wst.2019.182.
Biofouling is a critical issue in the membrane separation process as it can increase the operational cost by lower down membrane permeability. Covalent binding of an antibacterial agent on the membrane surface to kill microorganisms to hinder biofouling formation process draws great attention. In this study, we used three kinds of capsaicin derivatives, MBHBA, HMBA, and HMOBA, to fabricate antibiofouling membrane via UV-assisted photo grafting method. The influence of these capsaicin derivatives on membrane properties was investigated and compared. The results suggest that HMBA showed the best UV activity, followed by HMOBA and MBHBA successively. Due to the difference of functional groups among capsaicin derivatives, there is an increase in membrane wettability of HMBA and HMOBA-modified membranes, while there is a decrease for MBHBA-modified membrane. MBHBA-modified membrane showed enhanced irreversible fouling, which is in contrast to that of HMBA- and HMOBA-modified membranes. The modified membranes showed similar antibacterial activity against Escherichia coli. The practicability of the modified membranes was examined by dipping them into tap water and seawater for 30 days, and the results displayed the modified surfaces have the potential to relieve biofouling for separation membranes.
生物污染是膜分离过程中的一个关键问题，因为它会降低膜的渗透性，从而增加运营成本。将抗菌剂通过共价键结合到膜表面上以杀死微生物来阻止生物污染的形成过程引起了极大的关注。在这项研究中，我们使用了三种辣椒素衍生物，MBHBA、HMBA 和 HMOBA，通过 UV 辅助光接枝法制备了抗生物污染膜。研究了这些辣椒素衍生物对膜性能的影响并进行了比较。结果表明，HMBA 表现出最好的 UV 活性，其次是 HMOBA 和 MBHBA。由于辣椒素衍生物之间的官能团不同，HMBA 和 HMOBA 改性膜的亲水性增加，而 MBHBA 改性膜的亲水性降低。MBHBA 改性膜表现出增强的不可逆污染，与 HMBA 和 HMOBA 改性膜相反。改性膜对大肠杆菌表现出相似的抗菌活性。通过将改性膜浸泡在自来水中和海水中 30 天来检验其实际应用，结果显示改性表面有可能缓解分离膜的生物污染。
