Copolymer networks with contorted units and highly polar groups for ultra-fast selective cationic dye adsorption and iodine uptake. (17th January 2022)

• Record Type: Journal Article
• Authors: Baig, Noorullah; Shetty, Suchetha; Pasha, Sheik Saleem; Pramanik, Sumit Kumar; Alameddine, Bassam
• Is Part Of: Polymer. Volume 239(2022)
• Publication Date: 2022-01-17
• Subjects: Porous polymers -- Polycondensation -- Dyes and iodine adsorption -- Environmental remediation; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2021.124467
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: Three organic copolymer networks CP1-3 were synthesized using a mild polycondensation reaction of the commercially available tetrafluoroterephthalonitrile with three different building blocks with contorted geometries and bearing two hydroxyl groups, namely, triptycene 1a, fluorescein 1b, and phenolphthalein 1c . The target cross-linked copolymers CP1-3 revealed ultra-fast uptake of the cationic dye methylene blue (MB ) with an adsorption capacity reaching 300 mg/g. In addition, selectivity studies proved the preference of CP2 towards the cationic dye MB over the anionic dyes, such as, methyl orange (MO ) and Congo red (CR ). Copolymers CP1-3 also show superior iodine uptake properties reaching ∼150 wt% with virtually no loss in the adsorption capacity even after several successive adsorption-desorption cycles. The easy preparation and promising dyes adsorption and iodine uptake capacities promote the contorted copolymers CP1-3 as promising materials for environmental remediation applications. Graphical abstract: Image 1 Highlights: Versatile synthesis of three copolymer networks CP1-3 bearing contorted units and polar groups. CP1-3 disclose high thermal stability with a 10% weight loss temperature >385ᵒC. Ultrafast uptake of methylene blue in few minutes with a maximum capacity reaching 300 mg g −1 Selectivity tests show a quantitative preference towards cationic over anionic dyes. Superior iodine adsorption reaching 150 wt% even after several cycles.