▎ 摘 要
Graphene oxide (GO) composite membranes were fabricated on polyacrylonitrile (PAN) substrates via inserting copper hydroxide nanostrands (CHNs) between GO sheets and coupling with an ultrathin hydrophilic sodium alginate (SA) top-layer. The prepared membranes were characterized by using FESEM, FTIR, XRD, water contact angle and nanoscratch measurements. The intercalation of CHNs could enlarge ultrafast water permeation channels in base GO membrane without destroying its interlayered structure. Hydrogen bonding and electrostatic interaction ensured SA layer could firmly adhere onto base GO membrane, which should be conducive to swelling prevention and selective moisture enrichment. The dehydration performance was investigated as a function of SA deposit, CHNs intercalation, and feed temperature. Under optimal SA deposit, the permeation flux could be improved by 30 wt% after the intercalation of CHNs between GO sheets. The permeation flux through the prepared membrane could reach up to 3.65 kg m(-2) h(-1) with an excellent separation selectivity (99.70 wt% water content in permeate) at 70 degrees C for 10 wt% water-ethanol solution. The permeation flux and separation selectivity both increased with elevated temperatures, revealing the complete anti-trade-off behavior. The prepared membrane also possessed enhanced mechanical strength and firm interfacial adhesion, which ensured its integrity in practical operating conditions.