Pagliero Marcello, Comite Antonio, Costa Camilla, Rizzardi Ilaria, Soda Omar
Membrane & Membrane Research Group, Department of Chemistry and Industrial Chemistry, University of Genoa, Via Dodecaneso 31, 16146 Genova, Italy.
Membranes (Basel). 2021 Nov 19;11(11):896. doi: 10.3390/membranes11110896.
Membrane distillation is a growing technology that can address the growing problem of water shortage. The implementation of renewable energy and a reduction in the environmental impact of membrane production could improve the sustainability of this process. With this perspective, porous hydrophobic polyvinylidene fluoride (PVDF) membranes were prepared using triethyl phosphate (TEP) as a green solvent, using the non-solvent induced phase separation technique. Different amounts of carbon black were added to dope solutions to improve the photothermal properties of the membranes and to enable direct heating by solar energy. By optimizing the preparation conditions, membranes with porosity values as high as 87% were manufactured. Vacuum membrane distillation tests carried out using a concentrated NaCl solution at 50 °C showed distillate fluxes of up to 36 L/m h and a complete salt rejection. Some preliminary studies on the photothermal performance were also conducted and highlighted the possibility of using such membranes in a direct solar membrane distillation configuration.
膜蒸馏是一项不断发展的技术，能够解决日益严重的水资源短缺问题。可再生能源的应用以及膜生产对环境影响的降低可以提高这一过程的可持续性。从这个角度出发，使用磷酸三乙酯（TEP）作为绿色溶剂，采用非溶剂诱导相分离技术制备了多孔疏水聚偏氟乙烯（PVDF）膜。向铸膜液中添加不同量的炭黑以改善膜的光热性能，并实现太阳能直接加热。通过优化制备条件，制造出了孔隙率高达87%的膜。在50℃下使用浓NaCl溶液进行的真空膜蒸馏测试表明，馏出通量高达36 L/m²·h，且能完全拒盐。还对光热性能进行了一些初步研究，并强调了在直接太阳能膜蒸馏配置中使用此类膜的可能性。
