Preparation of MoS2/PVA photothermal sponge and its water evaporation performance
Solar-driven interfacial evaporation is one of the most promising technologies for seawater desalination and waste water treatment.Low cost,simple preparation,and high photothermal conversion efficiency of solar photothermal materials are crucial factors for the successful large-scale application of this technology.In this work,water was used as the solvent,polyvinyl alcohol(PVA)as the matrix,and molybdenum disulfide(MoS2)as the photothermal material to prepare polyvinyl alcohol sponge loaded with molybdenum disulfide(MoS2/PVA)through a one-pot method.The structure and properties of the sponges were characterized by using scanning electron microscope and energy dispersive X-ray spectrometer,Fourier transform infrared spectrometer,X-ray diffraction,contact angle analyzer and water evaporation tester.Experimental results confirmed the successful loading of MoS2 into the PVA sponge matrix.The influence of MoS2 content on the light absorption performance,photothermal performance,and solar-driven interfacial water evaporation performance of MoS2/PVA sponge were studied.Results show that at a MoS2 mass fraction of 7.5%,the prepared MoS2/PVA sponge exhibited the highest water evaporation rate under a 1 kW/m2 solar intensity,reaching an evaporation rate of 1.37 kg/(m2·h),approximately 4.42 times higher than the pure water evaporation rate of 0.31 kg/(m2·h),and the pure water evaporation efficiency of the MoS2/PVA sponge reached 93.1%.
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