碳纳米管
吸附
解吸
化学工程
材料科学
相对湿度
扩散
纳米技术
水蒸气
动力学
吸附
碳纤维
化学
复合材料
有机化学
热力学
工程类
物理
复合数
量子力学
作者
Yue Hu,Fang Zhou,Xinyi Wan,Xu Ma,Shilin Wang,Shuaikang Fan,Mengyang Dong,Zhizhen Ye,Xinsheng Peng
标识
DOI:10.1016/j.cej.2021.133086
摘要
High equilibrium uptake capacity and rapid adsorption/desorption kinetics are essential to achieve efficient atmospheric water harvesting. In this work, carbon nanotubes decorated hollow MIL-101(Cr) particles (HMC-2) are prepared and utilized for solar-driven atmospheric water harvesting with nice water adsorption capacity and fast kinetics. The hierarchical porous hollow MIL-101(Cr) particles formed by post-etching show highly active defect sites and low mass transfer resistance, which promotes the adsorption and diffusion of water molecules. The resulted HMC-2 demonstrates a maximum water uptake of 1.074 g/g at 25 °C, 90% RH. Notably, the water adsorption capacity of HMC-2 in low humidity (40% RH) are increased by 113% and 202.6% compared to pure MIL-101(Cr) and carbon nanotubes decorated MIL-101(Cr). Due to the synergistic effect of CNTs and hollow MIL-101(Cr), the HMC-2 composites generate sufficient solar thermal heat and improve the desorption kinetics. The maximum adsorbed water of HMC-2 can be completely desorbed within 90 min under one sunlight. A single cycle of sorption–desorption of HMC-2 can be achieved within 210 min. This means that if the water harvesting cycle is performed three times daily, it is possible to harvest 3.22 L of water per kilogram of adsorbent at the area with high humidity. The water uptake and release rates of HMC-2 are competitive with even superior to most those reported. This may demonstrate a promising potential for atmospheric water generators.
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