Zwitterionic hybrid aerobeads of binary metal organic frameworks and cellulose nanofibers for removal anionic pollutants. (November 2020)

• Record Type: Journal Article
• Authors: KarzarJeddi, Mohammad; Laitinen, Ossi; Mahkam, Mehrdad; Liimatainen, Henrikki
• Is Part Of: Materials & design. Volume 196(2020)
• Publication Date: 2020-11
• Subjects: Aerogel -- Nanocellulose -- Diclofenac -- Methyl orange -- Metal organic frameworks; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2020.109106
• Languages: English
• ISSNs: 0264-1275

Abstract

Abstract: Different adsorbents have been applied to remove various anionic pollutants in water treatment processes. However, the development of economic, sustainable, and high-performance adsorbents is still a challenge. Herein, we introduce a new strategy to produce highly porous (98.96%), very low density (0.015 g/cm 3 ), and cost-effective spherical and nanostructured hybrid aerogels, termed aerobeads, from cellulose nanofibers (CNF) and metal-organic frameworks (MOFs). The zwitterionic MOFs@CNF aerobeads (with 10–50 wt% MOF loading) were synthesized via simple dropping of a cross-linked hydrogel containing CNF and a binary mixture of anionic and cationic MOFs in liquid nitrogen, followed by freeze-drying. The flexible aerobeads (diameter of 2–3 mm) with hierarchical porous structure demonstrated an outstanding adsorption capacity toward both diclofenac (121.20 mg/g) and methyl orange (49.21 mg/g). Moreover, the aerobeads were easily collected after use from the solution without any complicated separation methods or the formation of secondary pollutants. Graphical abstract: Unlabelled Image Highlights: A novel freeze-drying approach for fabrication of functional, highly porous nanocellulose aerobeads was introduced. Zwitterionic aerobeads were obtained by mixing of anionic (HKUST-1) and cationic (ZIF-67) MOFs in nanocellulose framework. The aerobeads showed an outstanding adsorption toward both diclofenac (121.20 mg/g) and methyl orange (49.21 mg/g).