Functionalized Metal-Organic Frameworks for the Efficient Removal of Low Concentrations of Ammonia
Libo Li1, Yong Wang1, Jiangfeng Yang1
1College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, Shanxi, 030024, P. R. China.
Abstract:
The excellent ammonia adsorption properties of [Cu(bpy)2 (OTf)2 ]n (ELM-12; bpy=4,4'-bipyridine, OTf=trifluoromethanesulfonate) make it unique for the removal of ammonia at low concentrations, but its instability under humid conditions restrict its practical applications. Herein, a functionalized ELM-12@PDMS (PDMS=polydimethylsiloxane) composite was prepared by coating a nanoscale PDMS layer on the ELM-12 surface, which significantly increased its hydrophobicity. The dynamic ammonia adsorption properties of ELM-12 and ELM-12@PDMS were explored by means of kinetic breakthrough measurements under dry and humid conditions. ELM-12@PDMS can effectively capture ammonia at 100 ppm when maintained under 80 % relative humidity, which makes it promising for real applications.
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