AI Article Synopsis

  • Researchers used an ice-templating method to create chitosan/UiO-66 polymer/MOF monoliths aimed at improving water treatment by effectively adsorbing a herbicide compound, MCPP.
  • The unique macropores in these monoliths facilitated easier mass transport and allowed for simple retrieval from water using tweezers.
  • After treatment to enhance stability, the adsorbent displayed significant adsorption capacity at 34.33 mg/g, showing potential for reuse, but also indicated that further optimization of the composite’s structure could enhance performance even more.

Article Abstract

An ice-templating process was used to fabricate polymer/MOF monoliths, specifically chitosan/UiO-66, as adsorbents for water treatment. The ice-templated macropores enhanced mass transport, while the monoliths could be easily recovered from solution. This was demonstrated by the adsorption of methylchlorophenoxypropionic acid (MCPP, a herbicide compound) from dilute aqueous solution. To enhance the stability, the freeze-dried monoliths were treated with NaOH solution, solvent exchanged, and dried. The treated chitosan/UiO-66 monolith achieved an adsorption capacity of 34.33 mg g (a maximum theoretic value of 334 mg g by the Langmuir model), closer to the capacity (36.00 mg g) of the freshly prepared UiO-66 nanoparticles and much higher than that of the NaOH-washed UiO-66 nanoparticles (18.55 mg g), by performing the tests in 60 ppm MCPP solution. The composite monolith could be easily picked up using tweezers and used for recycling tests. Over 80% of the adsorption capacity was retained after three more cycles. The powder X-ray diffraction and N sorption studies suggested the crystalline structure of UiO-66 was destroyed during NaOH washing procedure. This, however, provides the potential to improve the adsorption capacity by developing methods to fabricate true polymer/MOF composites.

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Source
http://dx.doi.org/10.1021/acsami.7b10872DOI Listing

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