Environmentally Friendly Gelatin/β-Cyclodextrin Composite Fiber Adsorbents for the Efficient Removal of Dyes from Wastewater

Abstract

In this paper, environmentally friendly gelatin/β-cyclodextrin (β-CD) composite fiber adsorbents prepared by electrospinning were used for the removal of dyes from wastewater. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and a universal materials tester were employed to characterize the internal structures, surface morphologies and mechanical strength of the composite fiber adsorbents. Additionally, the fiber was evaluated as an adsorbent for the removal of methylene blue (MB) from aqueous solution. The effects of the raw material ratio, pH, temperature, concentration and adsorption time were studied. The results show that the gelatin/β-CD composite fiber adsorbents possess excellent mechanical strength and high adsorption efficiency for MB. The adsorption equilibrium and adsorption kinetics are well-described by the Langmuir isotherm model and the pseudo-second-order kinetic model, respectively. The theoretical maximum adsorption capacity is 47.4 mg·g−1. Additionally, after nine successive desorption-adsorption cycles, the removal rate is still over 70%. Moreover, the gelatin/β-CD composite fiber adsorbents exhibit excellent adsorption capability for basic fuchsin, gentian violet, brilliant blue R and malachite green dyes. Therefore, owing to the characteristics of degradability, low cost and high-efficiency, the gelatin/β-CD composite fiber can be used as an efficient adsorbent for the removal of dyes from wastewater.

Electrospun Gelatin Fibers Surface Loaded ZnO Particles as a Potential Biodegradable Antibacterial Wound Dressing

“…As shown in Figure 6a, the spectra of GZ1 and GZ2 represent three characteristic peaks at 1629, 1531 and 1236 cm −1 corresponding to amide I, amide II and amide III, respectively. The amide I band is mainly attributed to the tensile vibration of -C=O, and the amide II and III bands are caused by the bending vibration of -NH and the stretching vibration of -C-N, respectively [34]. A weak absorption peak at 407 cm −1 in the GZ1 and GZ2 spectra is consistent with the characteristic absorption peak of ZnO (as mentioned in Section 3.1.1), which belongs to the stretching vibration of the Zn-O bond.…”

Preparation of Poly (Allylthiourea-Co-Acrylic Acid) Derived Carbon Materials and Their Applications in Wastewater Treatment

“…In this study, the pseudo first-order model and pseudo second-order model were used to characterize the adsorption kinetics toward Ni(II), as expressed as follows [ 34 , 35 ]:…”

Preparation of Electrospun Gelatin Mat with Incorporated Zinc Oxide/Graphene Oxide and Its Antibacterial Activity

“…A new peak appeared at 420 cm −1 in the case of the fibers containing ZnO/GO corresponding to the stretching vibration peak of the Zn-O bond (Figure 6b), and an extra peak at 668 cm −1 could be assigned to the metal-oxygen stretching mode [16], which represents that ZnO/GO have been incorporated in the gelatin fibers successfully. The characteristic peaks of amid I, amid II and amid III observed at 1637, 1540 and 1244 cm −1 , respectively, both in GELF and ZGF were mainly attributed to -C=O stretching, -NH stretching and -C-N stretching, respectively [27]. In addition, the characteristic peak at 1454 cm −1 was mainly attributed to the stretching vibration peak of the imide group (-CH=N), which was caused by the reaction between the aldehyde group of formaldehyde and the amino lysine residue of gelatin [29].…”

“…The result indicated that different from uncross-linked gelatin fibers, which dissolve in aqueous solutions instantly, GEL and ZGF could be degraded completely in 7 days. Chen et al used the steam of formaldehyde/ethanol solution to crosslink the gelatin membranes, which was basically degraded after 5 days [27]. Eldin et al added glutaraldehyde into gelatin and chitosan mixture to crosslink the membranes; the weight loss of the crosslinked membranes was about 42% after 6 days [28].…”