Xiaohan Sun,Qianqian Yu,Haiyue Yang,Xin Wang,Zhaolin Yang,Yudong Li,Chengyu Wang
Organic oils and dyes are universal contaminants in the water environment that is exceptionally hazardous to health. However, low flux and degradation efficiency hinder those contaminants remove. Herein, the wood-based filtration device handles oily-dyed water by deep eutectic solvent (DES) treatment, exhibiting high specificity surface area and porosity. Life cycle assessment (LCA) provides evidence that the DES one-step treatment introduces fewer environmental impacts (EI) than the traditional two-step method of wood pretreatment. Moreover, DES-treated wood substrate (DTWS) decorated with palladium nanoparticles (PdNPs) shows high oil/water separation efficiency (98.9%) and excellent catalytic activity to convert MB (99.8%). Compared with numerous existing filtration membrane materials, the enhancement factors for outstanding oil/water separation and excellent catalytic performances are related to the high porosity and PdNPs content by adjusting DES treatment time. This wood-based filtration device with environmental-friendly, high flux, and excellent degradation efficiency gains optimistic expectations for practical sewage treatment application.
Liu Yushan,Cao Xiongxiong,Yang Mengfan,Wei Meng,Mao Jingya,Sun Jingjing,Xiang Huizhi,Wang Haihua
To address the low efficiency and flammability of wood-based phase change materials (WPCMs) in solar energy storage, this study developed a series of WPCMs (PEG/TPP/DW-P) with both flame retardancy and solar-thermal energy storage properties by vacuum-impregnating polyethylene glycol (PEG), triphenyl phosphate (TPP), and polydopamine (PDA)-functionalized carbon dots (PCDs) into delignified wood (DW). In addition to surface tension and capillary forces, the polyhydroxy structures of cellulose and hemicellulose in DW formed strong hydrogen bonds with PCDs, PEG, and TPP, further hindering the leakage of phase change materials (PCMs) during the “solid–liquid” phase Change process. The leakage rate was lower than that of most studies, at 4.67%, and the composite material could still maintain shape stability after 150 heating–cooling cycles. The PDA with a larger specific surface area in PCDs conducted efficient electron transfer with the carbon dots (CDs) loaded on it, resulting in the occurrence of non-radiative transitions. The photothermal energy storage efficiency was 90.68%, far exceeding those of pure CDs. The P-containing PCM-TPP synergistically interacted with the N in PCDs to generate a flame-retardant carbon layer. Compared with PEG/DW, the peak heat release rate and total heat release of PEG/TPP/DW-P were reduced by 28.19% and 13.45%, respectively. We also explored the practical application of WPCMs in simulating roofs, which showed good flame-retardant and thermal insulation properties. This study achieved the integration of the photothermal agent and flame retardant in WPCMs into the same nanomaterial-PCDs, minimizing the reduction in latent heat value caused by the addition of multiple components. The current research has very broad application potential in the practical application of WPCMs as buildings. Graphical Wood-based composite phase change materials based on polydopamine functionalized carbon dots for efficient solar-to-thermal energy storage and flame-retardant applications.
Tingting Zhang,Jin Qu,Jing Wu,Fan-Zhen Jiao,Changjun Li,Fu-Lin Gao,Ji Liu,Zhong-Zhen Yu,Xiaofeng Li
Solar-driven steam generation has emerged as a sustainable technology for addressing freshwater scarcity. However, significant challenges still exist in developing high-performance, multifunctional evaporators that are adept at both efficiently evaporating water and degrading pollutants, primarily because of the trade-offs among functional designs. Here, a self-floating solar evaporator is reported by functionalizing balsa wood with solar-thermal conversion material carbon nanotubes and catalytic manganese dioxide (MnO 2 ) nanoflowers for simultaneous solar evaporation and pollutant degradation. MnO 2 nanoflowers are rich in oxygen vacancies that can effectively activate peroxymonosulfate to generate reactive oxygen species for efficient organic pollutant degradation. A distinctive non-wetted porous interior structure and a precisely targeted water pathway are spontaneously established in the multifunctional evaporator, ensuring fast water supply, thermal insulation, efficient mass transfer, and high buoyancy. The resulting evaporators successfully combine an impressive evaporation rate of 2.74 kg m −2 h −1 , a high pollutant degradation efficiency (98.3% for 100 mg L −1 tetracycline and 97.4% for 200 mg L −1 Methyl orange), and stable self-floating and self-standing capabilities that ensure long-term operation stability even in complex real-world environments. This work provides an approach to design multifunctional solar evaporators, ensuring strong alignment with practical requirements while expanding their potential application scenarios.
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