Towards a High Rejection Desalination Membrane: The Confined Growth of Polyamide Nanofilm Induced by Alkyl-Capped Graphene Oxide

Membranes

Xiaoxiao Song¹  Mengling Zhang¹  Shuhao Wang¹  Na Zhang¹  Congjie Gao¹  Biqin Wu¹  Yong Zhou¹  Saren Qi² 

[1] Center for Membrane and Water Science & Technology, Zhejiang University of Technology, Hangzhou 310014, China;Suzhou Institute of Nano-Tech and Nano-Bionics (SINANO), Chinese Academy of Sciences, Suzhou 215123, China;

关键词: two-dimensional nanomaterials;    confined growth;    diffusion control;    interfacial polymerization;    reverse osmosis membrane;   

DOI  :  10.3390/membranes11070488

来源: DOAJ

【 摘 要 】

In this paper, we used an octadecylamine functionalized graphene oxide (ODA@GO) to induce the confined growth of a polyamide nanofilm in the organic and aqueous phase during interfacial polymerization (IP). The ODA@GO, fully dispersed in the organic phase, was applied as a physical barrier to confine the amine diffusion and therefore limiting the IP reaction close to the interface. The morphology and crosslinking degree of the PA nanofilm could be controlled by doping different amounts of ODA@GO (therefore adjusting the diffusion resistance). At standard seawater desalination conditions (32,000 ppm NaCl, ~55 bar), the flux of the resultant thin film nanocomposite (TFN) membrane reached 59.6 L m⁻² h⁻¹, which was approximately 17% more than the virgin TFC membrane. Meanwhile, the optimal salt rejection at seawater conditions (i.e., 32,000 ppm NaCl) achieved 99.6%. Concurrently, the boron rejection rate was also elevated by 13.3% compared with the TFC membrane without confined growth.

【 授权许可】

Unknown