Fabrication of the Diethylenetriamine Grafted Polyacrylonitrile Electrospun Nanofibers Membrane for the Aqueous Removal of Cationic Dyes
Diethylenetriamine (DETA) grafted polyacrylonitrile ((PAN) DETA-g-PAN) nanofibers (NFs) membrane was prepared by using electrospinning and chemical grafting techniques. Grafting of DETA to PAN was confirmed by Fourier Transform Infrared (FT-IR) spectroscopy. Adsorption kinetics of methylene blue (MB), rhodamine B (RB), and safranin T (ST) dyes onto PAN and DETA-g-PAN NFs membranes showed that adsorption leveled off at ∼60 min. The kinetics data showed good fitting to pseudo second-order model. No change in the intra-particle diffusion pattern was observed for DETA-g-PAN membrane. The equilibrium adsorption data fitted well to Lang- muir and Freundlich equations. The correlation coefficient (r 2) varied from 0.940–0.995 for Langmuir and 0.941 to 0.999 for Freundlich equation. The maximum adsorption capacities (q max) of dyes increased in the order: MB (42.66 mg/g for PAN and 184.84 mg/g for DETA-g-PAN) < ST (72.46 mg/g for PAN and 195.7 mg/g for DETA-g-PAN) < RB (99.31 mg/g for PAN and 367.65 mg/g for DETA-g-PAN). These values are far higher than the values reported in literature.
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Document Type: Research Article
Publication date: February 1, 2015
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