Functionalising Graphene Oxide Framework Membranes with Sulfonic Groups for Superior Aqueous Mixture Separation
Science Presentation | Guang Yang
Date & Time: Wednesday 15 May 2019, 12:00 | Location: Olympic Room
Hydrophilic pervaporation (PV) membranes with ultrahigh throughput and outstanding separation ability are highly beneficial for efficient separation of aqueous mixture such as solvent dehydration and desalination. However, it is still challenging to obtain high selectivity without compromising water permeation flux for the state-of-the-art PV membranes. Herein, a novel sulfosuccinic acid (SSA) covalently linked graphene oxide (GO) membrane is developed via a vacuum filtration process on a nylon substrate followed by heat treatment. During membrane fabrication, ester groups form through the dehydration condensation reaction between -COOH from the SSA and -OH from the GO, resulting in crosslinked graphene oxide framework (GOF) with well defined two-dimensional nanochannel, enhanced hydrophilicity and remarkable swelling resistance. As a result, the GOF-SSA membrane exhibits ultrahigh water flux towards both PV dehydration of alcohol and desalination with excellent separation property. For alcohol dehydration, the water content in the permeate above 99.6 wt% (separation factors greater than 1000) with exceptional high permeation flux (above 2.5 kg m-2 h-1) could be achieved for a range of alcohol at 30 °C. For desalination, salt rejections above 99.90% for various ions are obtained with unprecedented water permeation flux greater than 20 kg m-2 h-1 at 30 °C.
Guang Yang is currently a PhD student from Victoria University. In CSIRO, he is co-supervised by Zongli Xie (Manufacturing). His research topic is PVA based nanocomposite materials for pervaporation application.
- Stephen Gray (VU)
- Marlene Cran (VU)
- Mingmei Ding (Hohai Uni)
- Hang Xu (Hohai Uni)