Abstract

Dyes disposal in water has become a global concern due to its toxicity to humans and the aquatic ecosystem. Membrane separation processes can be an option to deal with this environmental issue. In this study, graphene oxide was functionalized with tannic acid (TA-GO) to coat the surface of a microfiltration membrane (MF_TA-GO). The ATR-FTIR, SEM, and WCA techniques confirmed that the membrane surface was successfully modified. MF_TA-GO obtained excellent removal rates for the twilight yellow and safranine orange dyes, maintaining the water flux recovery at high levels (> 66%). These results were superior to those obtained by the pure membrane and the membrane modified solely with GO. They can be attributed to the higher compatibility of TA-GO with the membrane surface. In addition, MF_TA-GO may be reused in consecutive cycles, demonstrating an operational advantage. The proposed process can be an alternative to improve the characteristics of microfiltration membranes used for dye removal from contaminated water.

摘要

由于其对人类和水生生态系统的毒性，水中的染料处理已成为全球关注的问题。膜分离工艺可以成为解决这一环境问题的一种选择。在这项研究中，氧化石墨烯用单宁酸（TA-GO）功能化以涂覆微滤膜（MF _TA-GO）的表面。ATR-FTIR、SEM和WCA技术证实膜表面已成功改性。MF _TA-GO对暮黄和藏红橙染料具有出色的去除率，将水通量恢复保持在高水平 (> 66%)。这些结果优于纯膜和仅用 GO 修饰的膜获得的结果。它们可归因于 TA-GO 与膜表面更高的相容性。此外，MF_TA-GO可以在连续的循环中重复使用，展现出操作优势。所提出的工艺可以作为改善用于从污染水中去除染料的微滤膜的特性的替代方案。