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MIL-160(Al) MOF’s potential in adsorptive water harvesting
Adsorption ( IF 3.0 ) Pub Date : 2021-01-04 , DOI: 10.1007/s10450-020-00286-5
M. P. Silva , A. M. Ribeiro , C. G. Silva , I. B. R. Nogueira , Kyung-Ho Cho , U.-Hwang Lee , J. L. Faria , J. L. Loureiro , Jon-San Chang , A. E. Rodrigues , A. Ferreira

The water crisis is one of the main global risks based on its societal impact, particularly the access to safe drinking water in regions with a dry (arid) or mainly dry (semi-arid) climate. Several techniques are being developed, namely the use of regenerative desiccant (e.g., MOFs) to water capture through adsorption processes. MIL-160(Al) belongs to the fumarate-based MOFs family, and it is one of the most promising MOFs for water harvesting and heat transformation applications. In this study, the potential of MIL-160(Al) as an adsorbent for water sorption based applications was evaluated. For this purpose, adsorption equilibrium isotherms, dynamic adsorption experiments, and MIL-160(Al) granules characterization were performed. H2O vapor adsorption equilibrium isotherm was studied at 303, 323, and 343 K presenting a type V shape and was fitted using the Cooperative Multimolecular Sorption model and Polanyi’s theory model. Additionally, CO2, N2, and O2 adsorption equilibrium isotherms were also measured but at 283, 303, and 323 K, presenting the following order of adsorption affinity: CO2 > O2 > N2. Water vapor adsorption breakthrough experiments corroborate the shape of the water adsorption equilibrium isotherms on MIL-160(Al). Water co-adsorption history proved that the presence of the other air components (CO2, O2, and N2) does not affect water adsorption behavior on MIL-160(Al). DRIFTS measurements proved the MIL-160(Al) structure remains stable during the water vapor exposure. The optimization of the TSA process allowed us to achieve maximum H2O productivity of 305 L·day−1·ton−1 for a regeneration temperature of 353 K and flow rate equal to 0.50 m3·s−1.



中文翻译:

MIL-160(Al)MOF在吸附水收集中的潜力

基于其社会影响,水危机是主要的全球风险之一,尤其是在干旱(干旱)或主要干旱(半干旱)的地区获得安全饮用水的情况。正在开发几种技术,即使用再生干燥剂(例如,MOF)通过吸附过程捕集水。MIL-160(Al)属于基于富马酸酯的MOF系列,是集水和热转化应用中最有前途的MOF之一。在这项研究中,评估了MIL-160(Al)作为基于水吸附应用的吸附剂的潜力。为此,进行了吸附平衡等温线,动态吸附实验和MIL-160(Al)颗粒表征。高2研究了在303、323和343 K处呈V型的O蒸气吸附平衡等温线,并使用合作多分子吸附模型和Polanyi理论模型进行了拟合。另外,还测量了CO 2,N 2和O 2的吸附平衡等温线,但在283、303和323 K时,表现出以下吸附亲和力顺序:CO 2  > O 2  > N 2。水蒸气吸附突破实验证实了MIL-160(Al)上水吸附平衡等温线的形状。水的共吸附历史证明存在其他空气成分(CO 2,O 2和N 2)不会影响MIL-160(Al)上的水吸附行为。DRIFTS测量证明,在暴露于水蒸气期间,MIL-160(Al)结构保持稳定。TSA工艺的优化使我们能够在353 K的再生温度和等于0.50 m 3 ·s -1的流速下实现305 L·day -1 ·ton -1的最大H 2 O生产率。

更新日期:2021-01-05
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