期刊
ACS ES&T ENGINEERING
卷 -, 期 -, 页码 -出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsestengg.3c00126
关键词
COFs; Cu(II); fast adsorption kinetics; removal of ammonia nitrogen; high selectivity
In this study, highly efficient ammonia nitrogen adsorbents were constructed by installing multiple ion-exchange complexation coordination-hydrogen bonding sites onto covalent organic frameworks (COFs). The prepared COFs exhibited high adsorption kinetics and adsorption selectivity, showing potential applications in water and wastewater treatment.
Abundant and diverse functional groups of adsorbentsare essentialfor their adsorption performances. Herein, we report a strategy toconstruct highly efficient ammonia nitrogen adsorbents by installingmultiple ion-exchange complexation coordination-hydrogen bonding sitesonto covalent organic frameworks (COFs). As a proof of concept, weprepared a COF (TpPa-SO3H) via a modified mechanical grindingsynthetic method and then obtained a sulfonated COF bearing singleCu sites (TpPa-SO3Cu0.5) by post-loading. Benefitingfrom the highly exposed active sites and ordered COF channels, TpPa-SO3Cu0.5 exhibited the highest adsorption kineticsamong reported ammonia nitrogen adsorbents proven by the highest pseudo-second-orderadsorption rate constant (k (2)) of 8.97g mg(-1) min(-1) with its maximumadsorption capacity (30.45 mg N g(-1)) higher thanmost adsorbents (<0.001-0.994 g mg(-1) min(-1) and 0-25 mg N g(-1)). Furthermore,TpPa-SO3Cu0.5 exhibited excellent adsorptionselectivity with its selective coefficient 328 times as high as thatof TpPa-SO3H in real water (10 mg N L-1, pH = 10). It also showed good stability and recyclability witha high ammonia recycle ratio (95.1%) after 5 adsorption-regenerationcycles. These findings pave a new way to develop unique COFs as platformsfor ultrafast and selective pollutants in water and wastewater treatment.
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