Related Experiment Video
Updated: Sep 23, 2025
10:08
Author Spotlight: Advancing 3D Coculture Systems with PVA-PCL Nanofibrous Membranes
Published on: December 27, 2024
442
Aminated EVOH nanofiber membranes for Cr(vi) adsorption from aqueous solution
Dandan Xu1, Jianwei Lu1, Shan Yan1
1State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University Shanghai 201620 P. R. China xiaoru@dhu.edu.cn.
RSC Advances
|May 11, 2022
Summary
Aminated ethylene vinyl alcohol (EVOH) nanofiber membranes effectively remove hexavalent chromium. DETA/EVOH membranes showed high efficiency and reusability, retaining 98.73% adsorption after six cycles.
Area of Science:
- Materials Science
- Environmental Science
- Chemical Engineering
Background:
- Ethylene vinyl alcohol (EVOH) nanofiber membranes offer potential for water treatment applications.
- Hexavalent chromium (Cr(VI)) poses significant environmental and health risks, necessitating efficient removal methods.
- Surface modification of nanofiber membranes can enhance their adsorption capabilities.
Purpose of the Study:
- To develop aminated-EVOH nanofiber membranes for effective hexavalent chromium removal.
- To investigate the impact of surface amination on the adsorption performance of EVOH membranes.
- To evaluate the adsorption kinetics, isotherm, thermodynamics, and reusability of the modified membranes.
Main Methods:
- EVOH nanofiber membranes were prepared using melt-blending extrusion and high-speed flow deposition.
- Surface amination was achieved through chemical modification, yielding l-Lys/EVOH, Cy/l-Lys/EVOH, and DETA/EVOH membranes.
- Membrane morphology and structure were analyzed using SEM, FT-IR, and XPS.
- Adsorption experiments were conducted to assess Cr(VI) removal efficiency, kinetics, isotherm, and thermodynamics.
Main Results:
- Amination significantly enhanced the Cr(VI) adsorption capacity of EVOH nanofiber membranes.
- The optimal pH for Cr(VI) removal was found to be 2.0.
- Adsorption followed Pseudo-second-order kinetics and was best described by the Freundlich isotherm model.
- The adsorption process was endothermic and spontaneous.
- DETA/EVOH membranes demonstrated excellent reusability, retaining 98.73% of initial adsorption efficiency after 6 cycles.
Conclusions:
- Aminated EVOH nanofiber membranes are highly effective for hexavalent chromium removal from aqueous solutions.
- The DETA/EVOH membrane exhibits superior performance and reusability, making it a promising candidate for wastewater treatment.
- The study highlights the potential of surface-modified nanofibers in addressing environmental contamination challenges.
