Ling Hao, Wang Lei, Zhou Haonan, Zhou Yunfeng, Yang Yang, Ge Wenjiao, Wang Xiaohui
State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China.
State Key Laboratory of Pulp & Paper Engineering, South China University of Technology, Guangzhou 510640, China.
J Colloid Interface Sci. 2024 Dec;675:515-525. doi: 10.1016/j.jcis.2024.06.248. Epub 2024 Jul 6.
The scarcity of freshwater resources and increasing demand for drinking water have driven the development of durable and sustainable desalination technologies. Although MXene composites have shown promise due to their excellent photothermal conversion and high thermal conductivity, their high hydrophilicity often leads to salt precipitation and low durability. In this study, we present a novel Cellulose (CF)/MXene paper with a Janus hydrophobic/hydrophilic configuration for long-term and efficient solar-driven desalination. The paper features a dual-layer structure, with the upper hydrophobic layer composed of CF/MXene paper exhibiting convexness to serve as a photothermal layer with exceptional salt rejection properties. Simultaneously, the bottom porous layer made of CF acts as an efficient thermal insulation. This unique design effectively minimizes heat loss and facilitates efficient water transportation. The Janus CF/MXene paper demonstrates a high evaporation rate of 1.11 kg mh and solar thermal conversion efficiency of 82.52 % under 1 sun irradiation. Importantly, even after 2500 h of operation in a simulated seawater environment, the paper maintains a stable evaporation rate without significant salt deposition and biodegradation due to an antibacterial rate exceeding 90 %. These findings highlight the potential of the Janus CF/MXene paper for scalable manufacturing and practical applications in solar-driven desalination.
淡水资源的稀缺以及对饮用水需求的不断增加推动了耐用且可持续的海水淡化技术的发展。尽管MXene复合材料因其优异的光热转换性能和高导热性而展现出应用前景，但其高亲水性常常导致盐沉淀和耐久性较低。在本研究中，我们展示了一种具有疏水/亲水双面结构的新型纤维素（CF）/MXene纸，用于长期高效的太阳能驱动海水淡化。该纸具有双层结构，上层由CF/MXene纸组成的疏水层呈现凸面，用作具有卓越拒盐性能的光热层。同时，由CF制成的底部多孔层作为高效隔热层。这种独特设计有效减少了热损失并促进了高效的水传输。在1个太阳光照下，双面CF/MXene纸的蒸发速率高达1.11 kg m⁻¹ h⁻¹，太阳能热转换效率为82.52%。重要的是，即使在模拟海水环境中运行2500小时后，由于抗菌率超过90%，该纸仍保持稳定的蒸发速率，且无明显盐沉积和生物降解现象。这些发现凸显了双面CF/MXene纸在太阳能驱动海水淡化的规模化制造和实际应用中的潜力。
