科研之友
微信
新浪微博
Facebook
分享链接
摘要
Fouling remains one of the biggest challenges in a myriad of applications such as water filtration, ship hulls, biomedical devices, coating, and painting. Fouling severely hampers the performance and increases the operation and maintenance costs in industries. There is a critical need to develop antifouling surfaces, and two-dimensional (2D) materials, such as graphene oxide (GO) and molybdenum disulfide (MoS2), have shown potential for antifouling surface preparation due to some unique properties. Here, the antifouling properties of these two materials were investigated by observing the deposition kinetics of bacteria and natural organic matter (NOM) using a quartz crystal microbalance with dissipation monitoring (QCM-D). Suwannee River humic acid (SRHA) and E. coli K-12 were used as model NOM and bacteria, respectively. Overall, MoS2 showed slightly better antifouling properties compared to GO. In most cases, the deposition of NOM and E. coli was significantly lower on MoS2 than GO due to the presence of functional groups on GO that bind more easily with the foulants. Deposition of NOM was at least 1.5 times lower on the MoS2 surface than on the GO surface in the presence of both monovalent (Na+) and divalent (Mg2+) cations. However, the presence of 0.5 mM divalent cations (Ca2+, Mg2+) with NOM reduced the antifouling properties of both MoS2 and GO by a factor of 1.5 due to a salt bridging effect and reduced energy barrier.Environmental significance Two-dimensional graphene-based nanomaterials including graphene oxide ( GO) and reduced graphene oxide ( rGO) have shown antibacterial properties, which could be useful for different environmental applications. Many studies also reported the potential application of GO/ rGO for antifouling membrane preparation. While graphene-based materials have been extensively studied, recently molybdenum disulfide ( MoS2) nanosheets have gained lots of attention. Most of the research has focused on MoS2 for application in electronics, catalysis, biomedical devices and energy related fields. However, its use as an antifouling material has not been extensively explored. MoS2 has extremely low friction as well as low surface roughness and thus has great potential for antifouling surface preparation. Overall, MoS2 showed superior antifouling properties compared to GO in this study. Results indicate that MoS2 may be more suitable for antifouling surfaces in environmental applications. Integration of MoS2 for the preparation of antifouling surfaces could be applied in different applications such as water filtration, ship hulls, biomedical devices, coating, and painting.
- 出版日期2018-7-1
- 单位西北大学
