PDF(Pubmed)
Abstract：
Dehumidifying air via refrigerant cooling method consumes a tremendous amount of energy. Independent humidity control systems using desiccants have been introduced to improve energy efficiency. This research aimed to find an alternative to the commonly used solid desiccant, silica gel, which has weak physical adsorption properties. It also aimed to overcome the limitation of liquid desiccants that may affect indoor air quality and cause corrosion. This study reports on the synthesis of poly(vinyl alcohol-co-acrylic acid), P(VA-AA), through solution polymerisation by hydrolysing poly(vinyl acetate-co-acrylic acid), P(VAc-AA). This viable copolymer was then incorporated with graphene oxide (GO) at different concentrations (0 wt.%, 0.5 wt.%, 2 wt.% and 5 wt.%) to enhance the adsorption-desorption process. The samples were tested for their ability to adsorb moisture at different levels of relative humidity (RH) and their capability to maintain optimum sorption capacity over 10 repeated cycles. The nanocomposite film with 2% GO, P(VA-AA)/GO2, exhibited the highest moisture sorption capacity of 0.2449 g/g for 60-90% RH at 298.15 K, compared to its pristine copolymer, which could only adsorb 0.0150 g/g moisture. The nanocomposite desiccant demonstrated stable cycling stability and superior desorption in the temperature range of 318.15-338.15 K, with up to 88% moisture desorption.
摘要：
通过制冷剂冷却方法对空气进行除湿会消耗大量的能量。已引入使用干燥剂的独立湿度控制系统以提高能源效率。本研究旨在寻找一种替代常用的固体干燥剂，硅胶,具有弱的物理吸附性能。它还旨在克服可能影响室内空气质量并引起腐蚀的液体干燥剂的限制。本研究报道了聚乙烯醇-共丙烯酸的合成，P(VA-AA),通过水解聚（乙酸乙烯酯-共丙烯酸）的溶液聚合，P（VAc-AA）。然后将该可行的共聚物与不同浓度(Owt.%,0.5wt.%,2wt.%和5wt。%)以增强吸附-解吸过程。测试样品在不同相对湿度(RH)水平下吸附水分的能力和在10个重复循环中保持最佳吸附能力的能力。含有2%GO的纳米复合膜，P（VA-AA）/GO2，在298.15K下60-90％RH下表现出0.2449g/g的最高吸湿能力，与其原始共聚物相比，只能吸附0.0150g/g水分。纳米复合干燥剂在318.15-338.15K的温度范围内表现出稳定的循环稳定性和优异的解吸，高达88%的水分解吸。
