Electrospun Cellulose Acetate–Polycaprolactone/Chitosan Core–Shell Nanofibers for the Removal of Cr(VI)

Abstract

Core-shell-structured cellulose acetate-polycaprolactone/chitosan (CA-PCL/CS) nanofibers with excellent removal performance of hexavalent chromium (Cr(VI)) are developed by coaxial electrospinning. The effect of core-to-shell ratio on adsorption capability is studied. The results show that all core-shell-structured fibers possess higher adsorption capability and good durability in acidic environment compared with the CS powder adsorbent. CA-PCL/CS fibers with coreto-shell ratio of 0.442 have a maximum adsorption capability of 126 mg g À1 at room temperature. The adsorption kinetics reveals that chemisorption serves as the rate-determining step by notable electron transfer, share, or exchange between adsorbents and adsorbates. The adsorption equilibrium data of the core-shell-structured CA-PCL/CS fiber adsorbents are all well described by the Freundlich isotherm model, indicating the multilayer adsorption process. Herein, it is highlighted that the core-shell-structured CA-PCL/CS nanofibers have a promising prospect in removing Cr(VI) ions from waste water.

Fabrication of biodegradable fibrous systems employing electrospinning technology for effluent treatment

“…Due to the improvement in mechanical properties with a core–shell nanofiber geometry, they have been introduced in industrial wastewater treatment applications. Ma et al 146 fabricated core–shell-structured cellulose acetate–polycaprolactone/chitosan (CA–PCL/CS) nanofibers via the coaxial electrospinning technique with a core-to-shell ratio of 0.442 to eliminate Cr( vi ) with a maximum removal efficiency of 126 mg g −1 at room temperature. The adsorption kinetics illustrated the mechanism of chemisorption with possible transferring, sharing, or exchange of electrons with the adsorbate and adsorbent.…”

Fe(III) Complexed Polydopamine Modified Mg/Al Layered Double Hydroxide Enhances the Removal of Cr(VI) from Aqueous Solutions

“…In addition, there may be competing adsorption between OHand Cr(VI) in the system [40]. With the increase of pH, the content of OHin the system gradually increases, which intensifies the competitive adsorption behavior between OHand Cr(VI) [41], thus reducing the adsorption amount of Cr(VI).…”

Removal of metal ions using Chitosan based electro spun nanofibers: A review

“…It was noticed that the core shell structured fibers possess higher adsorption capability and good durability in acidic environment and also reported that CA-PCL/CS fibers with core-to-shell ratio of 0.442 have a maximum adsorption capability of 126 mg/g at room temperature. It is reported that it have a significant role in the adsorption of chromium [79].…”