Charge-Gated Ion Transport through Polyelectrolyte Intercalated Amine Reduced Graphene Oxide Membranes

• DOI: 10.1021/acsami.7b13724
• Publication Date: 2017-11-07T15:58:23Z
• Authors: Xiaoxiao Song; Rahul S. Zambare; Saren Qi; Bhuvana NIL Sowri...; Antony Prince Jam...; Chuyang Y. Tang; Congjie Gao
• Keywords: 02 engineering and technology; 0210 nano-technology; 6. Clean water

Charge-gated channels are nature's solutions for transport of water molecules and ions through aquaporins in biological membranes while excluding undesired substances. The same mechanism has good potentials to be adopted pressure or electrically driven membrane separation processes. Herein, we report highly charged nanochannels created polyelectrolyte (PE) intercalated amine reduced graphene oxide (PE@ArGO membrane). PE@ArGO membrane, with a rejection layer ∼160 nm thickness, features laminate structure smooth top surface low roughness (typically ∼17.2 nm). Further, modified (mPE@ArGO membrane) was developed situ using free chlorine scavenging post-treatment method, which designed alter the charge keeping alteration layered minimal. mPE@ArGO +4.37 −4.28 mC/m2 respectively. In processes, pure permeability 2.9 10.8 L m–2 h–1 bar–1, Salt is dependent on density surface, valence co-ions size hydrated form. For example, positively membranes, salts follows order of: R(MgCl2), 93.0% > R(NaCl), 88.2% ≈ R(MgSO4), 88.1% R(Na2SO4), 65.1%; negatively 90.3% 85.4% 68.3% 42.9%. To best knowledge authors, this first study based (GOBMs) high positive/negative gated ion behavior. What's more, rate along not been achieved by other types GOBMs.