A Simple, Mild, and Low-Cost Method for Preparation of Wood-Nigrosine in Solar-Driven Interfacial Evaporation System

The solar-driven interfacial evaporation system has attracted much attention in recent years due to its reduced heat loss and accelerated steam generation. As a low-cost and readily available resource, wood is widely applied as photothermal materials in solar-driven interfacial evaporation system because of its superior water transfer and heat loss prevention properties. Herein, a simple, mild, and cost-effective method is employed to fabricate wood-based photothermal materials. The results demonstrate that the solar absorption rate of wood-nigrosine is more than 97.5% across a wide wavelength range (200–2500 nm), and an evaporation rate of 1.46 kg m −2 h −1 and evaporation efficiency (86.1%) are achieved under 1-sun illumination (100 mW cm −2 ). The solar-driven interfacial evaporation system based on wood-nigrosine exhibits strong structural stability and processing capability for dyes and seawater.