MIL型金属有机框架材料空气除湿性能研究

固体除湿装置因其结构简单、可利用低品位能源等优点，在空气调节及空气取水中发挥重要作用。除湿材料是固体除湿装置的关键部分，关乎整个设备的效率和能耗。采用水热法合成了MIL-101(Cr)、MIL-101(Fe)和MIL-100(Fe),通过X射线衍射对其进行了表征。搭建了固定床吸附/脱附实验台，测定了水蒸气在3种除湿材料上的吸附等温线和吸附动力学特性。对比研究了MIL-101(Cr)、MIL-101(Fe)和MIL-100(Fe)3种金属有机框架化合物对水蒸气的吸附性能。结果表明：MIL-101(Cr)和MIL-101(Fe)对水蒸气具有超高吸附能力，分别高达1.50 g/g和1.33 g/g。MIL-101(Fe)吸附速率最快，吸附穿透时间最短，并且吸附速率随相对湿度的增大而减小。相对湿度50%时，MIL-101(Fe)吸附速率达到了0.738。10次循环后MIL-101(Cr)和MIL-101(Fe)的吸附容量的损失分别为3.33%和3.22%,循环吸附表明MIL-101(Cr)和MIL-101(Fe)对水蒸气吸附具有优异的可逆性和稳定性。

Air dehumidification performance of MIL-type metal-organic frameworks

Solid dehumidification device plays an important role in air conditioning and air water intake because of its simple structure and low-grade energy. Dehumidifying material is the key part of solid dehumidification device, which is related to the efficiency and energy consumption of the whole equipment. MIL-101(Cr), MIL-101(Fe) and MIL-100(Fe) were synthesized by hydrothermal method and characterized by XRD. A fixed-bed adsorption/desorption experiment platform was set up to determine the adsorption isotherms and adsorption kinetic characteristics of water vapor on three dehumidification materials. The water vapor adsorption properties of MIL-101(Cr), MIL-101(Fe) and MIL-100(Fe) metal-organic frameworks were compared. The experimental results show that MIL-101(Cr) and MIL-101(Fe) have super high adsorption capacity for water vapor, up to 1.50 g.g-1 ^{and 1.33} g.g^-1, respectively. MIL-101(Fe) has the fastest adsorption rate and the shortest breakthrough time, and the adsorption rate decreases with the increase of relative humidity. The adsorption rate of MIL-101(Fe) reached 0.738 at 50% relative humidity. After 10 cycles, the loss of adsorption capacity of MIL-101(Cr) and MIL-101(Fe) was 3.33% and 3.22%, respectively. Cyclic adsorption showed that MIL-101(Cr) and MIL-101(Fe) had excellent reversibility and stability for water vapor adsorption.