Preparation and adsorption behavior of diethylenetriamine/polyacrylonitrile composite nanofibers for a direct dye removal

Abstract

The diethylenetriamine (DETA)/polyacrylonitrile (PAN) composite nanofibers were prepared by using electrospinning technique. The surface morphology and chemical characterization of PAN/DETA composite nanofibers were investigated using scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy. Releasing possibility of DETA from nanofibers was tested by total organic carbon (TOC) analysis. Results indicated that the incorporation of DETA into PAN affects the morphology of nanofibers. In order to hinder DETA releasing, this compound was fixed to the polymer using alkali treatment. The obtained PAN/DETA composite nanofibers were evaluated for adsorption of C.I direct red 80 (DR80). The amount of the dye adsorbed onto the PAN/DETA nanofiber mats was influenced by the initial pH, DETA amount, contact time, and the initial concentration of the dye solutions. The maximal adsorption capacity of the dye on the PAN/DETA nanofiber mats was calculated from the Langmuir model.

Development of a Novel Mixed Titanium, Silver Oxide Polyacrylonitrile Nanofiber as a Superior Adsorbent and its Application for MB Removal in Wastewater Treatment

“…25 Recently, PAN surface modification has been performed by many researchers using diethylenetriamine, polyethyleneimine and ethylenediamine for heavy metal ions and dye adsorption. 26 It is reported that mixed metal oxides containing two or more metals were effective catalysts and catalytic supports for a wide variety of organic reactions. 27,28 Taking advantage of the high specific surface area of nanostructures, TiO 2 and other metal oxides have been utilized to enhance dye degradation adsorption purpose.…”

Fabrication of hollow and nonhollow SiO2 nanofibers for removal of cationic dyes from aqueous solutions

“…The intraparticle diffusion model is given as : where k p and I are the intraparticle diffusion rate constant (gmol −1 min −1/2 ) and intercept related to the adsorption steps, respectively. If the intraparticle diffusion is involved in the adsorption reaction, then a plot of q t against t 1/2 gave a straight line and the particle diffusion would be the controlling step if this line passed through the origin .…”

Current Advances of Polymer Composites for Water Treatment and Desalination

“…is chemical modification of the composite structure affected the removal efficiency of the direct dyes. Also, it is important to note that the amount of dye adsorbed had been affected by the ratio of the diethylenetriamine added to the composite, indicating how important the composition ratio is in the composite [21].…”

“…SEM images of diethylenetriamine incorporated with polyacrylonitrile (a) before and (b) after surface modification (reproduced with a permission from[21]). …”