posted on 2021-07-08, 12:38authored byHanxue Sun, Yuanzhen Li, Jiyan Li, Zhaoqi Zhu, Wanting Zhang, Weidong Liang, Chonghua Ma, An Li
Solar-driven
interfacial water evaporation is one promising technology
for seawater desalination and sewage purification because it offers
a feasible and sustainable strategy to relieve global water scarcity.
Herein, a novel hybrid film composed of recycled carbon soot and poly(vinyl
alcohol) is developed by a very simple, green, and highly scalable
“salt-assisted” assembling method. The hybrid film possesses
characteristics with a porous structure, superhydrophilicity, ∼100%
light absorption, and low thermal conductivity, which can effectively
convert light into heat under solar illumination. Consequently, the
hybrid film can achieve a photothermal conversion efficiency of 91.5%
under a stimulated solar irradiation of 1 kW m–2. Furthermore, the hybrid film can be applied for seawater desalination
and dye wastewater purification. The findings of our work not only
provide a new photothermal platform with high light-to-thermal conversion
ability and good reusability but also open a new avenue for the applications
of carbon soot-based hybrid films in solar-assisted water evaporation
and sewage purification.