基于负载氯化钙的聚丙烯酰胺水凝胶的可持续低成本吸附剂
Sustainable, low-cost sorbents based on calcium chloride-loaded polyacrylamide hydrogels
AI总结：
本文提出一种负载高浓度氯化钙的聚丙烯酰胺水凝胶吸附剂，通过优化溶胀过程实现低成本、高吸水性能，在相对湿度30%和70%下吸水量分别达0.92和2.38 g/g，成本性能比超越氯化锂系统，且循环稳定性良好。
摘要：
吸附剂是应用于大气集水、热能储存和被动冷却的极具前景的材料，从而应对水资源短缺和全球能源转型相关的核心挑战。近期，吸湿性水凝胶复合材料作为高性能吸附剂崭露头角。然而，许多此类系统采用不可持续且昂贵的吸附剂材料制造，阻碍了其广泛部署。本文展示了负载前所未有的氯化钙量的高性能、高性价比聚丙烯酰胺水凝胶的合成。为此，优化了聚丙烯酰胺水凝胶在氯化钙水溶液中的溶胀过程。将水凝胶中可达到的盐负载量表征为温度、溶胀溶液中的氯化钙浓度以及水凝胶制备条件的函数。结果表明，所得的水凝胶-盐复合材料在反复的吸附-解吸循环中保持稳定，并能在 30% 和 70% 相对湿度下分别实现每克干材料 0.92 和 2.38 克水的吸水量。由此产生的成本性能比大幅超越基于氯化锂的系统。此外，关于水凝胶与盐相互作用机理的见解可为未来水和能源应用中可持续、低成本吸附剂材料的设计提供指导。
英文摘要：
Sorbents are promising materials for applications in atmospheric water harvesting, thermal energy storage, and passive cooling, thereby addressing central challenges related to water scarcity and the global energy transition. Recently, hygroscopic hydrogel composites have emerged as high-performance sorbents. However, many of these systems are fabricated with unsustainable and costly sorbent materials, which hinders their wide deployment. Here, the synthesis of high-performance, cost-efficient polyacrylamide hydrogels loaded with unprecedented amounts of calcium chloride is demonstrated. To this end, the swelling procedure of polyacrylamide hydrogels in aqueous calcium chloride solutions is optimized. The achievable salt loading in the hydrogel is characterized as a function of temperature, calcium chloride concentration in the swelling solution, and the hydrogel preparation conditions. The obtained hydrogel-salt composites are shown to be stable under repeated sorption-desorption cycling and enable water uptakes of 0.92 and 2.38 grams of water per gram of dry materials at 30% and 70% relative humidity, respectively. The resulting cost-performance ratio substantially exceeds lithium chloride-based systems. Further, the mechanistic insights on hydrogel salt interactions can guide the design of sustainable and low-cost sorbent materials for future applications in water and energy.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
