International Journal of Nanoscience and Nanotechnology

International Journal of Nanoscience and Nanotechnology

Effect of TiO2-MWCNTs Nanocomposite on the Performance of Mixed Matrix Nanofiltration Membranes: Manganese Ion Removal

Document Type : Research Paper

Authors
Sedigheh Daroumi 1
Ramin Yavari 2
Mohammad Ali Aroon 3
Takeshi Matsuura 4
1 University of Tehran, Tehran, Iran
2 Nuclear Fuel Cycle School, Nuclear science and technology Research institute, (NSTRI), P.O.Box. 11365-8486, Tehran, Iran
3 School of Chemical Engineering, College of Engineering, University of Tehran,Tehran, Iran
4 Industrial Membrane Research Laboratory, Chemical Engineering Department, University of Ottawa, Ottawa, Canada
10.22034/ijnn.2025.2024498.2490
Abstract
This study aims to investigate the removal of manganese ions from aqueous residues of the chemical industries using neat and mixed matrix polyethersulfone (PES) membranes. Functionalized multi-walled carbon nanotubes (MWCNTs), titanium dioxide nanoparticles (TiO2), and multi-walled carbon nanotubes/titanium dioxide nanoparticles (TiO2-functionalized MWCNTs hybrid) were used as the fillers in the mixed matrix membranes to improve the membrane performance. MWCNTs were oxidized and functionalized using nitric acid. TiO2 and TiO2-functionalized MWCNTs nanoparticles were synthesized by the sol-gel method and Sun et al.’s method, respectively. These nanoparticles were characterized by transmission electron microscopy (TEM) and nitrogen adsorption/desorption isotherms (BET). Both neat and mixed matrix PES membranes were fabricated by the phase inversion method and characterized by SEM and contact angle measurement. They were further subjected to the filtration test for manganese removal. SEM images showed that all the tested membranes have an asymmetric structure with a top-dense control layer supported by a sublayer with finger-like pores. Results of the contact angle test demonstrated adding each of these particles (functionalized MWCNTs, TiO2, and TiO2-functionalized MWCNTs) reduced the contact angle and, thus, increased the hydrophilicity of the membrane. The results of the filtration tests are as follows; Adding 0.1% functionalized MWCNTs could increase the membrane flux to 28.65 L/m2s (with 89.3% manganese ions rejection), adding 0.1% TiO2 increased the manganese ion rejection percentage to 92.06% (with a flux of 8.97 L/m2s) and adding 0.1% TiO2-functionalized MWCNTs hybrid increased the flux to 26 L/m2s (with 87.04% manganese ions rejection).
Keywords
Manganese
Nanofiltration
MWCNTs
TiO2
TiO2-MWCNTs hybrid
Wastewater treatment
Subjects

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International Journal of Nanoscience and Nanotechnology
Volume 20, Issue 4
2024
Pages 231-248