Allmond Kelsey, Stone John, Harp Spencer, Mujibur Khan
Department of Mechanical Engineering, Georgia Southern University, Statesboro, GA, 30458, USA.
Department of Chemistry, Georgia Southern University, Statesboro, GA, 30458, USA.
Nanoscale Res Lett. 2017 Dec;12(1):6. doi: 10.1186/s11671-016-1798-6. Epub 2017 Jan 5.
We report the sonochemical synthesis of MOF (metal organic framework) nanoparticles of 30-200 nm in size and electrospraying of those particles on electrospun nanofibers to process a MOF-attached nanofibrous membrane. This membrane displayed significant selectivity towards CO and capacity of adsorbing with 4000-5000 ppm difference from a mixed gas flow of 1% CO and 99% N. Applying ultrasonic waves during the MOF synthesis offered rapid dispersion and formation of crystalline MOF nanoparticles in room temperature. The MOF nanoparticles of 100-200 nm in size displayed higher surface area and adsorption capacity comparing to that of 30-60 nm in size. Nanofibrous membrane was produced by electrospinning of MOF blended PAN solution followed by electrospraying of additional MOF nanoparticles. This yielded uniform MOF deposition on nanofibers, occurred due to electrostatic attraction between highly charged nanoparticles and conductive nanofibers. A test bench for real-time CO adsorption at room temperature was built with non-dispersive Infrared (NDIR) CO sensors. Comparative tests were performed on the membrane to investigate its enhanced adsorption capacity. Three layers of the as-produced membranes displayed CO adsorption for approximately 2 h. Thermogravimetric analysis (TGA) of the membrane showed the thermal stability of the MOF and PAN up to 290 and 425 °C, respectively.
我们报道了尺寸为30 - 200纳米的金属有机框架（MOF）纳米颗粒的声化学合成，以及将这些颗粒电喷雾到电纺纳米纤维上以制备附着有MOF的纳米纤维膜的过程。该膜对一氧化碳表现出显著的选择性，对于1%一氧化碳和99%氮气的混合气流，其吸附容量相差4000 - 5000 ppm。在MOF合成过程中施加超声波可在室温下实现晶体MOF纳米颗粒的快速分散和形成。尺寸为100 - 200纳米的MOF纳米颗粒比尺寸为30 - 60纳米的MOF纳米颗粒具有更高的表面积和吸附容量。纳米纤维膜是通过电纺MOF共混的聚丙烯腈溶液，然后电喷雾额外的MOF纳米颗粒制备而成。这导致MOF在纳米纤维上均匀沉积，这是由于高电荷纳米颗粒与导电纳米纤维之间的静电吸引所致。利用非分散红外（NDIR）一氧化碳传感器搭建了一个室温下实时一氧化碳吸附的测试平台。对该膜进行了对比测试以研究其增强的吸附容量。三层制备好的膜对一氧化碳的吸附时间约为2小时。该膜的热重分析（TGA）表明MOF和聚丙烯腈分别在高达290℃和425℃时具有热稳定性。
