GO membranes with well-defined sub-nanometer channels are optimal for desalination and wastewater purification.However,the inherent instability of the interlayer structure and the severe trade-off between selectivity ...GO membranes with well-defined sub-nanometer channels are optimal for desalination and wastewater purification.However,the inherent instability of the interlayer structure and the severe trade-off between selectivity and permeability pose a significant challenge for GO membranes to be effectively applied to nanofiltration.Herein,we synthesized a series of PSSNa-GO-EDA/Al_(2)O_(3) membranes by embedding poly(sodium 4-styrenesulfonate)(PSSNa)into ethylenediamine-crosslinked GO interlayers.The resultant membranes exhibited greater interlayer structures,in which new hydrophilic confined nanostructures were constructed.Effective nanofiltration performance was achieved through electrostatic-induced ion-confined partitioning.The PSSNa-GO-EDA-1/Al_(2)O_(3)(PGE-1)membrane showed high rejection rates of 86.0%for Na_(2)SO_(4) and 53.8%for NaCl while maintaining competitive pure water permeance of 10.85 L·m^(-2)·h^(-1)·bar^(-1)(1 bar=0.1 MPa),which is 12.1 times higher than that of the pristine GO membrane.More importantly,after immersion in pure water for 680 h,this membrane retained commendable separation performance.Overall,our work provides an effective strategy to finely fabricate confined nanostructures in lamellar GO-based nanofiltration membranes featuring excellent separation performance.展开更多
基金supported by the National Natural Science Foundation of China(21490581)China Petroleum&Chemical Corporation(317008-6)。
文摘GO membranes with well-defined sub-nanometer channels are optimal for desalination and wastewater purification.However,the inherent instability of the interlayer structure and the severe trade-off between selectivity and permeability pose a significant challenge for GO membranes to be effectively applied to nanofiltration.Herein,we synthesized a series of PSSNa-GO-EDA/Al_(2)O_(3) membranes by embedding poly(sodium 4-styrenesulfonate)(PSSNa)into ethylenediamine-crosslinked GO interlayers.The resultant membranes exhibited greater interlayer structures,in which new hydrophilic confined nanostructures were constructed.Effective nanofiltration performance was achieved through electrostatic-induced ion-confined partitioning.The PSSNa-GO-EDA-1/Al_(2)O_(3)(PGE-1)membrane showed high rejection rates of 86.0%for Na_(2)SO_(4) and 53.8%for NaCl while maintaining competitive pure water permeance of 10.85 L·m^(-2)·h^(-1)·bar^(-1)(1 bar=0.1 MPa),which is 12.1 times higher than that of the pristine GO membrane.More importantly,after immersion in pure water for 680 h,this membrane retained commendable separation performance.Overall,our work provides an effective strategy to finely fabricate confined nanostructures in lamellar GO-based nanofiltration membranes featuring excellent separation performance.
