Volume 141, Issue 8 e54997
RESEARCH ARTICLE

Development of polyethersulfone/polylactic acid-blended nanocellulose membranes for enhanced removal of methylene blue dye

Senelisile Moyo

Senelisile Moyo

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Contribution: Conceptualization (equal), ​Investigation (equal), Methodology (equal), Project administration (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Oranso T. Mahlangu

Oranso T. Mahlangu

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Contribution: Methodology (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Gcina D. Vilakati

Gcina D. Vilakati

Department of Chemistry, Faculty of Science and Engineering, University of Eswatini, Kwaluseni, Kingdom of Eswatini

Contribution: Methodology (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Bhekie B. Mamba

Bhekie B. Mamba

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Contribution: Conceptualization (equal), ​Investigation (equal), Methodology (equal), Project administration (equal), Supervision (lead), Writing - original draft (equal), Writing - review & editing (equal)

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Lueta A. De Kock

Lueta A. De Kock

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Contribution: Conceptualization (equal), ​Investigation (equal), Methodology (equal), Project administration (equal), Supervision (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Nozipho N. Gumbi

Nozipho N. Gumbi

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Contribution: Conceptualization (equal), Funding acquisition (equal), ​Investigation (equal), Methodology (equal), Project administration (equal), Supervision (equal), Writing - original draft (equal), Writing - review & editing (equal)

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Edward N. Nxumalo

Corresponding Author

Edward N. Nxumalo

Institute for Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Johannesburg, South Africa

Correspondence

Edward N. Nxumalo, Institute for Nanotechnology and Water Sustainability, University of South Africa, Florida 1709, Johannesburg, South Africa.

Email: [email protected]

Contribution: Conceptualization (equal), Funding acquisition (lead), ​Investigation (equal), Methodology (equal), Project administration (equal), Supervision (lead), Writing - original draft (supporting), Writing - review & editing (supporting)

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First published: 10 December 2023

Abstract

Herein, adsorptive polyethersulfone/polylactic acid (PES/PLA) blends membranes with systematic concentrations of cellulose nanofibers (CNFs) (0.5–2.5 wt%) were developed via a modified phase inversion process for the enhanced removal of cationic methylene blue (MB) dye. To the best of our knowledge, this is the first time that such adsorptive membranes have been produced for potential use in wastewater treatment. The fabricated membranes were characterized for surface and cross-sectional morphology (scanning electron microscope), surface roughness (atomic force microscope), functionality (Fourier-transform infrared spectroscopy), thermal stability (thermal gravimetric analysis), wettability (contact angle measurements), antifouling behavior (flux recovery studies), and dye adsorption and reusability (adsorption and desorption tests). CNF incorporated membranes showed improved wetting properties, with contact angle decreasing from 76° in the pristine membranes to 48° in 2.5 wt% PES/PLA membranes. The membrane bulk porosity increased from 60.3% to 79.23%, while the pure water flux increased from 210.8 to 399.12 Lm−2 h−1. At optimal conditions, CNF-modified membranes removed >98% of MB compared with 8% removal by the pristine membranes. After five cycles of adsorption and desorption, the membrane with 2 wt% CNFs achieved over 70% dye removal showing excellent reusability properties. Adsorption followed pseudo-second-order and Freundlich models. The adsorption was attributed to electrostatic interactions between the negatively charged membrane surfaces and the positively charged dye molecules as well as through hydrogen bonding. Therefore, this work revealed that CNF-modified PES/PLA membranes can be used as adsorbents for the enhanced removal of organic pollutants in water treatment applications.

CONFLICT OF INTEREST STATEMENT

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

DATA AVAILABILITY STATEMENT

The data that supports the findings of this study are available from the corresponding author upon reasonable request.

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