Dong Feilong, Xu Bo, Ma Xiaoyan, Liu Tao, Luo Bin, Li Xuedi, Song Shuang, Nie Shuangxi
College of Environment, Zhejiang University of Technology, Hangzhou, 310014, China.
Shaoxing Research Institute, Zhejiang University of Technology, Shaoxing, 312085, China.
Small. 2025 May;21(21):e2500369. doi: 10.1002/smll.202500369. Epub 2025 Apr 4.
Due to the increasing shortage of freshwater resources and energy, solar-driven interfacial evaporation (SDIE) technology has emerged as a key solution for utilizing solar energy to produce freshwater. However, certain volatile contaminants tend to evaporate along with water vapor and condense into the freshwater. This study combined contact-electro-catalysis (CEC) with photocatalysis using solar energy to enhance the degradation efficiency of pollutants. A FeOCl/TiO/PVDF membrane based on photocatalysis and CEC is designed to evaluate the catalytic degradation performance using crystal violet (CV) as a model contaminant. The membrane exhibited a degradation rate of ≈95% for CV within 36 min. The degradation mechanism is further verified by intermediate identification, quenching experiments, and free radical detection. Under visible light, the CV degradation is driven by reactive radicals, such as hydroxyl radical and superoxide radical, which generated through dual electron transfer processes (from water molecules and FeOCl/TiO to PVDF). Additionally, the application of the droplet-based triboelectric nanogenerator (TENG) is proposed with the FeOCl/TiO/PVDF membrane in SDIE system to remove phenol in seawater desalination. This study expanded the applications of TENGs and provided strategy to solve the problem of pollutant accumulation in solar-driven seawater desalination systems.
由于淡水资源和能源日益短缺，太阳能驱动的界面蒸发（SDIE）技术已成为利用太阳能生产淡水的关键解决方案。然而，某些挥发性污染物往往会随着水蒸气一起蒸发并凝结到淡水中。本研究将接触电催化（CEC）与光催化相结合，利用太阳能提高污染物的降解效率。设计了一种基于光催化和CEC的FeOCl/TiO/PVDF膜，以结晶紫（CV）作为模型污染物来评估其催化降解性能。该膜在36分钟内对CV的降解率约为95%。通过中间产物鉴定、猝灭实验和自由基检测进一步验证了降解机理。在可见光下，CV的降解是由通过双电子转移过程（从水分子和FeOCl/TiO到PVDF）产生的羟基自由基和超氧自由基等活性自由基驱动的。此外，还提出了将基于液滴的摩擦纳米发电机（TENG）与FeOCl/TiO/PVDF膜应用于SDIE系统中，以去除海水淡化中的苯酚。本研究扩展了TENGs的应用，并提供了解决太阳能驱动海水淡化系统中污染物积累问题的策略。
