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Constructing a solar evaporator by stacking exhausted wood sponges for freshwater generation and fertilizer recovery

Von Wiley-VCH zur Verfügung gestellt

Solar water evaporation is an efficient and sustainable technology. To further reduce energy consumption and improve cost efficiency, the surface modification of wood sponge by polypyrrole-glutathione (PGWS) was achieved using an in-situ synthetic method. The PGWS exhibits excellent adsorption efficiency for Hg(II) ions with adsorption capacity of 330.8 mg g-1 at 25 °C. Following Hg(II) absorption, the PGWS could be upcycled for solar steam generation. A stackable device was constructed by stacking wood sponge under the Hg(II) saturated PGWS (PGWS-Hg(II)), which showed the highest water evaporation rate of 2.14 kg m-2 h-1 under 1 kW m-2. Moreover, collecting paper was inserted between the stacked PGWS-Hg(II) and wood sponge for the collection of salts. The salt can be successfully collected from the simulated fertilizer plant effluent and then used as a nutrient for growing plants using a hydroponic system. The facile design of stackable evaporation provides an opportunity for wastewater utilization by harvesting solar energy.

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