Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 263, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2023.112597
Keywords
Electrospinning; Nanofiber membrane; Solar-driven water evaporation; Cellulose acetate; Oil-in-water emulsion
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In this study, a cellulose acetate/graphene nanofiber membrane evaporator with superior oil resistance was prepared by electrospinning. The evaporator exhibits high solar absorption, high porosity, and low thermal conductivity. It can efficiently purify oil-in-water emulsion and stably desalinate seawater, providing a feasible solution to the water resource shortage issue.
Solar-driven water evaporation is a promising approach to solve the issue of water resource shortage. Herein, a cellulose acetate (CA)/graphene(G) nanofiber membrane evaporator with superior oil resistance was prepared by electrospinning and subsequently with the deacetylation process. The as-fabricated d-CA/G composite nanofiber membranes possess high solar absorption, high porosity, and low thermal conductivity. The evaporation rate of d-CA/G composite nanofiber membrane with a graphene concentration of 3 % for pure water can reach 1.38 kg m- 2 h-1 with the corresponding efficiency of 88.4 % under one sun illumination. Moreover, the d-CA/G com-posite nanofiber membrane possesses super hydrophilic and underwater superoleophobicity. Thus, the d-CA/G composite nanofiber membrane can resist fouling by oils and dissolve the concentrated salt back into bulk water, resulting in efficient purification capacity for oil-in-water emulsion and stable desalination performance for seawater in the long term. The evaporation rate of the d-CA/G evaporator can approach 1.37 kg m- 2 h-1 when used for the purification of oil-in-water emulsion. This study provides a facile way for the development of multifunctional nanofiber membrane evaporators with highly efficient and sustainable for seawater desalination and wastewater treatment.
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