The Cover Feature shows a very strong, super tough, antibacterial, and UV‐blocking biodegradable poly(vinyl alcohol) nanocomposite film, in which the homogeneously interspersed antibacterial agent TA@LS‐Ag of about 20 nm was prepared from the green biomass sodium lignosulfonate and tannic acid with extremely low silver content (0.032–0.32 wt ‰). More information can be found in the Full Paper by X. Zhang et al.
Solar interfacial evaporation based
on wood-derived materials has
been considered a promising strategy for desalination and wastewater
purification. Herein, we adopted delignified wood (DW) as the water
transport substrate and lignosulfonate (LS)-modified narrow-band gap
semiconductor nickel disulfide (NiS2) as the light-absorbing
agent (LS-NiS2) to fabricate a high-efficiency evaporator
(LS-NiS2@DW). On the one hand, the high absorbance (>95%)
within a broad wavelength range and excellent photothermal conversion
efficiency of LS-NiS2 endow efficient solar energy utilization.
On the other hand, the hydrophilicity of DW facilitates water activation,
which results in a lower evaporation enthalpy of LS-NiS2@DW (1274.4 kJ kg–1) than that of pure water. By
combining LS-NiS2 and DW, LS-NiS2@DW achieved
an evaporation rate as high as 2.80 kg m–2 h–1 under one sun irradiation (1 kW m–2), and the evaporation efficiency reached 87.4%. Notably, LS-NiS2@DW exhibits a high evaporation rate (2.42–2.69 kg
m–2 h–1) in simulated seawater
for 24 h with no salt crystals formed on the surface. Moreover, LS-NiS2@DW shows high antibacterial activity with about 90% reduction
in bacterial survival rate. This work could provide new perspectives
for the design of a high-efficiency wood-based photothermal evaporator.
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