Abstract
Solar driven interfacial evaporation (SDIE) holds significant potential in water treatment and soil improvement. This study innovatively designed a photothermal water purification and soil amelioration system based on salt crystallization migration. Its purpose is to efficiently purify brackish water and improve saline-alkali soil using solar stream evaporator. The core of this system lies in the utilization of cellulose nanofibers (CNF), vinyltrimethoxysilane (VTMO), and carbon nanotubes (CNT) as raw materials. The hydroxyl groups provided by CNF chemically crosslink with the methoxy groups provided by VTMO, and a gradient temperature reduction method is employed to shape a photothermal material (CNT-V-CNF) with aligned channels. CNT-V-CNF exhibits high light absorption (95 %), superhydrophilicity, and excellent thermal insulation properties, enabling a high photothermal evaporation rate (1.7 kg·m−2·h−1). The incorporation of the salt migration carrier significantly strengthens the salt tolerance of CNT-V-CNF, allowing it to maintain efficient and stable photothermal conversion performance in actual brackish water conditions. This achievement results in a daily water production capacity of 10.23 kg·m−2·d−1. After irrigating saline-alkaline soil with the purified freshwater for 52 days, the germination rate of wheat seeds sown in the soil has increased by approximately 65 %. The results of this study demonstrate the tremendous potential of SDIE centered on CNT-V-CNF in the agricultural irrigation and soil remediation practices.
Published Version
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