Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 292, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2022.121037
Keywords
g-C3N4 nanosheets; MXene nanomaterials; Photocatalytic membrane; Self-cleaning; Pollutant removal
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Funding
- National Natural Science Foundation of China [42077185]
- Sichuan Science and Technology Program for Distinguished Young Scholars [2022JDJQ0010]
- National Key Research and Development Program of China [2020YFC1808300]
- Research Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection [SKLGP2020Z002]
- Applied Basic Research Programs of Science and Technology Commission Foundation of Sichuan Province [21YYJC0401]
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The present study combines photocatalysis and membrane technology to develop a novel photocatalytic composite membrane for wastewater treatment. The composite membrane exhibits excellent permeability, high removal efficiency for organic pollutants, and improved anti-fouling characteristics.
The present paper deals with the coupling the advantages of photocatalysis and membrane technology in order to resolve the issue of membrane fouling without any compromise on separation characteristics. The g C3N4 (CN) nanosheets have been used to modify two-dimensional (2D) MXene membrane, to obtain novel g C3N4@MXene/PES (CN MX) photocatalytic composite membrane through vacuum filtration for wastewater treatment. The 2D materials and membranes have been characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) to evidence successful modification. The CN-MX composite membrane exhibited higher permeability than that of pure MXene membrane, which achieved a maximum permeability of 1790 L.m(-2).h (-1).bar(-1). The composite membrane also showed a fabulous removal ratio for different organic pollutants: 98 % for Congo red (CR), 96 % for Trypan blue (TB) and 86 % for Tetracycline hydrochloride (TC), respectively. The best performed membrane (M3) was found to sustain three consecutive separation cycles without any performance deterioration and thereby, confirming a significant improvement in anti-fouling characteristic of the membrane.
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