Preparation of ice-templated MOF-polymer composite monoliths and their application for wastewater treatment with high capacity and easy recycling

Fu, Q, Wen, L, Zhang, L, Chen, X, Pun, D, Ahmed, A, Yang, Y and Zhang, H ORCID: 0000-0001-5142-5824 (2017) Preparation of ice-templated MOF-polymer composite monoliths and their application for wastewater treatment with high capacity and easy recycling ACS Applied Materials and Interfaces, 9 (39). pp. 33979-33988. ISSN 1944-8244, 1944-8252

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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^-1 (a maximum theoretic value of 334 mg g^-1 by the Langmuir model), closer to the capacity (36.00 mg g^-1) of the freshly prepared UiO-66 nanoparticles and much higher than that of the NaOH-washed UiO-66 nanoparticles (18.55 mg g^-1), 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<inf>2</inf> 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.

Item Type:	Article
Uncontrolled Keywords:	ice-templating, porous monoliths, polymer/MOF composites, UiO-66, chitosan, water treatment
Depositing User:	Symplectic Admin
Date Deposited:	13 Oct 2017 14:25
Last Modified:	01 Mar 2026 05:27
DOI:	10.1021/acsami.7b10872
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3010058
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