Water extraction from air is a promising strategy for alleviating the current water crisis since it provides inexhaustible water resources to the places where surface and groundwater are scarce. This study systematically assesses 12 selected microporous materials out of zeolites, aluminophosphate zeotypes (AlPOs), and metal-organic frameworks (MOFs), the most promising adsorbents to meet the stringy criteria for economic water harvesting. Through a comparative study of water adsorption isotherms, desorption enthalpies, regeneration temperatures, water capacity, and kinetics at the same condition, the zeotype aluminophosphate with AEI framework topology (AlPO-18) stands out. Using AlPO-18, 0.29 g/g water uptake is achieved in a narrow relative humidity range before 13%. The adsorbent regeneration is almost completed below 70 °C. Moreover, AlPO-18 is non-toxic and the synthesis is low-cost. Therefore, AlPO-18 is a good candidate for adsorbent in developing energy-saving atmospheric water harvest (AWH) technology to extract water from “dry” air.

中文翻译：

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评估不同类型的微孔材料用于节能大气水收集的效果

从空气中提取水是缓解当前水危机的一种有前途的策略，因为它为地表水和地下水稀缺的地方提供了取之不尽用之不竭的水资源。这项研究系统地评估了 12 种精选的沸石、磷酸铝沸石 (AlPO) 和金属有机框架 (MOF) 微孔材料，这些材料是最有希望满足经济集水严格标准的吸附剂。通过对相同条件下的水吸附等温线、解吸焓、再生温度、水容量和动力学的比较研究，具有AEI骨架拓扑结构的沸石型磷酸铝（AlPO-18）脱颖而出。使用 AlPO-18，在 13% 之前的较窄相对湿度范围内实现了 0.29 g/g 的吸水率。吸附剂再生在70℃以下几乎完成。而且AlPO-18无毒，合成成本低。因此，AlPO-18 是开发节能大气水收集（AWH）技术以从“干燥”空气中提取水的吸附剂的良好候选者。