Abstract
This work presented a highly efficient, porous and floatable sodium alginate/carbon black (SACB) gel beads by instantaneous gelation method for photothermal interfacial evaporation. We thoroughly examined how NaHCO3 and CB affect the performance of photothermal evaporation. As a consequence, the ideal porous SACB gel beads displayed an exceptional evaporation rate of 1.39 kg m−2 h−1 and a superior photothermal conversion efficiency of 97.76 % under 1 sun illumination. Additionally, the resulted SACB gel beads maintained good recyclability even after 10 repeated evaporation cycles, and the fresh water collected after evaporation complies with WHO and US Environmental Protection Agency (EPA). The SACB gel beads developed in this work have a remarkable capacity for photothermal conversion and would be a strong contender for solar-powered seawater desalination.
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