A 3D Corncob-based interfacial solar evaporator enhanced by environment energy with salt-rejecting and anti-corrosion for seawater distillation

Biomass-derived, carbon converted from renewable biomass materials via the carbonization process, has been widely investigated for interfacial solar evaporators and is deemed a promising choice for solar desalination. However, salt accumulation at the evaporation interface is a great challenge. Studies show that the surface wetting and antifouling ability of carbonized-biomass, affects solar absorption, water supply, and water evaporation. In this paper, a simple two-step strategy completely different from carbonization is proposed for efficient solar evaporation and seawater desalination. In this regard, an interfacial solar evaporator is prepared based on the corn cob. The evaporator makes the best use of the raw three-dimensional interconnected fiber network structure, which extremely promotes the collection of solar energy, sufficient water supply, and vapor escape at the evaporation interface. Owing to the decrease in evaporation enthalpy and drawing energy from the environment, the evaporation rate and the photothermal conversion efficiency of proposed the evaporator reached 1.68 kg center dot m(-2)center dot h(-1) and 99.32 % under solar irradiation intensity of 1 kW center dot m(-2), respectively. The performance of the proposed scheme was investigated under various salinity levels and a great salt-rejecting and anti-corrosion performance was achieved. This simple strategy is a promising candidate for preparing biomass-based interfacial solar evaporators in practical applications.

Automated summary

In this paper, a simple two-step strategy using corn cob as the base for interfacial solar evaporators is proposed for efficient solar evaporation and seawater desalination. The proposed evaporator utilizes the three-dimensional interconnected fiber network structure to enhance solar energy collection, water supply, and vapor escape at the evaporation interface. The evaporator achieved an evaporation rate of 1.68 kg.m-2.h-1 and a photothermal conversion efficiency of 99.32% under a solar irradiation intensity of 1 kW.m-2. The proposed scheme showed excellent salt-rejecting and anti-corrosion performance, making it a promising candidate for biomass-based interfacial solar evaporators in practical applications.