Electrospinning Nanofibrous Sodium Alginate/β‐Cyclodextrin Composite Membranes for Methylene Blue Adsorption

Abstract

To effectively remove the toxic dyes from wastewater, sodium alginate (SA)/𝜷-cyclodextrin(𝜷-CD) nanofibrous composite membranes with average fiber diameters of 167-174 nm are obtained by an electrospinning method. The adsorption capacity of the SA/𝜷-CD membrane for methylene blue is 2776 mg g -1 , much higher than that of a pure SA membrane (1780 mg g -1 ). The incorporation of 𝜷-CD also improves the adsorption rate significantly. The adsorption mechanism is mainly the synergy of the electrostatic attraction of SA and the host-guest interaction of 𝜷-CD. Meanwhile, the SA/𝜷-CD nanofibrous membranes can be used in a wide pH range, and maintain excellent adsorption capacity after four cycles. The rapid adsorption efficiency and excellent adsorption capacity of SA/𝜷-CD nanofibrous membrane endows great potential in the field of wastewater treatment.

Preparation of β-cyclodextrin/PVDF composite films for efficient adsorption of Cu2+

“…While the β-CD/PVDF composite film exhibited partial diffraction peaks of PVDF and β-CD at 20.24°and 27.31°, respectively. This phenomenon might arise from the influence of the organic solvent or high-voltage electric field during the electrospinning process, which affected the crystalline structure of β-CD, resulting in the disappearance of its partial diffraction peaks [44].…”

“…This phenomenon could be attributed to the presence of numerous active sites on the surface of films and the higher concentration gradient of Cu 2+ during the initial phase, which facilitated rapid binding with active sites [45]. However, as the adsorption time prolongs, these active sites gradually were occupied, resulting in a gradual approach towards equilibrium [44]. In comparison with the PVDF film, the addition of β-CD significantly enhanced the adsorption efficiency of Cu 2+ by β-CD/PVDF composite films, and the adsorption efficiency gradually increased with increasing β-CD content.…”

Electrospun Polyurethane Nanofiber Membranes for Microplastic and Nanoplastic Separation

“…Faris et al developed a polystyrene-based fibrous membrane with GO functionalization using plasma treatment for MB adsorption with an MB adsorption capacity of 114 mg g –1 . Xiaolong Ma et al developed a sodium alginate/β-cyclodextrin electrospun composite membrane to remove toxic dyes from contaminated water. It showed a high adsorption capacity of 2776 mg g –1 .…”