Chitosan/polyamide nanofibers prepared by Forcespinning® technology: A new adsorbent to remove anionic dyes from aqueous solutions. (15th February 2017)

• Record Type: Journal Article
• Authors: Dotto, G.L.; Santos, J.M.N.; Tanabe, E.H.; Bertuol, D.A.; Foletto, E.L.; Lima, E.C.; Pavan, F.A.
• Is Part Of: Journal of cleaner production. Volume 144(2017)
• Page Start: 120
• Page End: 129
• Publication Date: 2017-02-15
• Subjects: Anionic dyes -- Chitosan -- Forcespinning® -- Nanofibers -- Polyamide; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2017.01.004
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: Chitosan/polyamide nanofibers (CP nanofibers) were prepared by a new Forcespinning ® technology, and used as alternative adsorbent to remove Reactive Black 5 (RB5) and Ponceau 4R (P4R) dyes from aqueous solutions. The results demonstrated that under the best operational conditions (30 G½" needles, spinneret rotation of 12000 rpm for 10 min and chitosan polyamide ratio of 1.00/1.50), chitosan/polyamide nanofibers were produced at a rate of 3 g h −1 . CP nanofibers presented a semi–crystalline structure, with several functional groups and diameter from 100 to 500 nm. The adsorption of RB5 and P4R on the CP nanofibers was favored at pH of 1.0. Pseudo–second order (RB5) and Elovich (P4R) models were the more adequate to represent the kinetic data. The equilibrium data followed the Langmuir model, being the maximum adsorption capacities of 456.9 mg g −1 for RB5 and 502.4 mg g −1 for P4R. The adsorption was spontaneous, favorable and endothermic. Desorption and reuse was possible for four times, maintaining the same adsorption capacity. In brief, it can be concluded that the Forcespinning ® technology is an alternative to obtain chitosan/polyamide nanofibers with suitable characteristics. These nanofibers in turn, can be successfully applied to remove dyes from aqueous media. Graphical abstract: Highlights: Chitosan/polyamide nanofibers were developed by the forcespinning technology. Nanofibers presented diameter from 80 to 400 nm and were able to adsorb dyes. The adsorption capacities were of 456.9 mg g −1 for RB5 and 502.4 mg g −1 for P4R. The nanofibers can be used four times, maintaining the adsorption capacity.