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Title: Incorporation of amine-grafted halloysite nanotube to electrospun nanofibrous membranes of chitosan/poly (vinyl alcohol) for Cd (II) and Pb (II) removal
Journal: Applied Clay Science
Author: 1,2. Romina HMT Shirazi, Toraj Mohammadi, 1,2,3. Amir Atabak Asadi
Year: 2022
Address: 1. Center of Excellence for Membrane Science and Technology, Department of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran 2. Research and Technology Centre of Membrane Separation Processes, School of Chemical, Petroleum and Gas Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran 3. Petroleum Refining Technology Development Division, Research Institute of Petroleum Industry (RIPI), Tehran, 14857-33111, Iran
Abstract: Amino group grafted halloysite nanotubes (Hal-NH2s) were used to enhance adsorption/filtration performance of chitosan (CS)/poly (vinyl alcohol) (PVA) electrospun nanofibers by coating on the polymeric membrane as well as embedding them into the polymer solution. The novel cactus-like nanofibers exerted considerably higher Cd(II) and Pb(II) adsorption capacity than other functionalized materials. The compositional changes of functionalized Hals were verified by Fourier Transform Infrared Spectroscopy (FT-IR) and X-Ray Diffraction (XRD). Morphology of Hal-NH2 loaded nanofibers was characterized as well as thermal/mechanical properties. Impacts of potentially affecting parameters including Hal-NH2 loading, pH, temperature, contact time, and initial concentration of heavy metal ions were optimized in the adsorption process. According to the well-fitted Langmuir model, the maximum adsorption capacity of Cd(II) and Pb(II) ions at 120 min were measured to be 454.5 and 476.2 mg/g for the Hal-NH2 entrapped nanofibers, while for the Hal-NH2 coated nanofibers, higher values of 516.3 and 551.6 mg/g were measured, respectively. Kinetics of the adsorption process was also studied, indicating that a pseudo-second-order model was fitted on the experimental data. In contrast to the Hal-NH2 coated nanofibers, the Hal-NH2 entrapped nanofibers were considered stable, and their adsorption capacity remained almost intact after five adsorption/desorption cycles. These affinity membranes revealed promising Cd(II) and Pb(II) ions removal, and uniform permeation flux, indicating their ability to be the next generation of adsorptive filters.
Keywords:
Application: Membrane
Product Model 1: Electroris
Product Model 2:
URL: #https://www.sciencedirect.com/science/article/abs/pii/S0169131722000552#