Biomass Hydrogel Solar-Driven Multifunctional Evaporator for Desalination, VOC Removal, and Sterilization
Ning An, Mengyu Ma, Yi Chen, Zhining Wang, Qian Li
Abstract
Solar-driven photothermal interfacial evaporation technology is currently perceived as one of the most green and effective freshwater production strategies available. However, when dealing with actual complex water bodies, it remains a challenge to combine steam generation with removing volatile organic compounds (VOCs) and inactivating bacteria at the same time to achieve multiple water purification effects. In this paper, a solar evaporator (SA/CCC/Cu 2+ ) integrating photothermal and photocatalytic effects was successfully constructed by using a Cu 2+ cross-linked biomass sodium alginate (SA) hydrogel as the basic skeleton and carbonized carboxymethyl chitosan (CCC) embedded internally as the photothermal material. During the solar evaporation process, the SA/CCC/Cu 2+ evaporator successfully realized the separation of distilled water from bulk water containing VOCs, achieving the VOC removal efficiency of 96.77% while maintaining an evaporation rate of 2.54 kg m –2 h –1 . In addition, it demonstrated remarkable capacity in inactivating Escherichia coli ( E . coli ), eliminating 100% of the bacteria within 40 min. With the rapid evaporation rate and impressive water purification effect, this design is anticipated to be a new path for solar-driven interfacial evaporative freshwater production.