Separating water from miscible organic solvents could significantly reduce the environmental impact of solvent waste,improve solvent purification and help recycling.Yet,it remains energy-and cost-intensive.Herein,we d...Separating water from miscible organic solvents could significantly reduce the environmental impact of solvent waste,improve solvent purification and help recycling.Yet,it remains energy-and cost-intensive.Herein,we demonstrate an electrostatic solvent nanofiltration(ESN)method that can separate water from a variety of miscible solvents with high flux and negligible energy consumption.The method utilizes the dramatic difference in electrical response between water and organic matter.By using a conductive,nonpermeable layered membrane with molecular narrow channels,we can selectively switch on the spontaneous permeation for water using a low-power(10^(−1) W m^(−2))electrical bias.As a result,water permeated at a flux of a few L m^(−2) h^(−1) under the pressure of its own gravity.The flux is comparable to the stateof-art pervaporation membranes while the specific energy consumption is negligible.Thanks to the poor electrical response of organics,during the ESN of a miscible mixture containing water,acetone,n-butanol,and iso-butanol,the rejection rate reached 99.64%for acetone,96.38%for n-butanol,and 98.33%for iso-butanol.We expect our work to advance the separation and recycling of solvents by exploiting their different physical properties on the molecular scale.展开更多
基金supported by the Natural Science Foundation of Shandong Province(ZR2023MB037)the National Key R&D Program of China(2022YFB3805900)+4 种基金the National Natural Science Foundation of China(22272194)the Key R&D Project of Shandong Province(2022CXGC010302)the Natural Science Foundation of Shandong Province(ZR2021YQ12)QIBEBT/SEI/QNESL(S202303)the Postdoctoral Applied Research Project of Qingdao.
文摘Separating water from miscible organic solvents could significantly reduce the environmental impact of solvent waste,improve solvent purification and help recycling.Yet,it remains energy-and cost-intensive.Herein,we demonstrate an electrostatic solvent nanofiltration(ESN)method that can separate water from a variety of miscible solvents with high flux and negligible energy consumption.The method utilizes the dramatic difference in electrical response between water and organic matter.By using a conductive,nonpermeable layered membrane with molecular narrow channels,we can selectively switch on the spontaneous permeation for water using a low-power(10^(−1) W m^(−2))electrical bias.As a result,water permeated at a flux of a few L m^(−2) h^(−1) under the pressure of its own gravity.The flux is comparable to the stateof-art pervaporation membranes while the specific energy consumption is negligible.Thanks to the poor electrical response of organics,during the ESN of a miscible mixture containing water,acetone,n-butanol,and iso-butanol,the rejection rate reached 99.64%for acetone,96.38%for n-butanol,and 98.33%for iso-butanol.We expect our work to advance the separation and recycling of solvents by exploiting their different physical properties on the molecular scale.
