Novel nitrogen and sulphur co-doped carbon quantum dots/titanium oxide photocatalytic membrane for in-situ degradation and removal of pharmaceutical compound

Weng Shin Koe, Woon Chan Chong, Yean Ling Pang, Chai Hoon Koo, Mahmoudi Ebrahim, Abdul Wahab Mohammad

Research output: Contribution to journalArticle

Abstract

In this study, a novel photocatalytic membrane had been successfully fabricated through the incorporation of N,S-CQDs/TiO2 nanocomposite on polysulfone (PSF) membrane for the photodegradation of pharmaceutical compound namely diclofenac (DCF) in water. The N,S-CQDs/TiO2 nanocomposites were synthesized with different loadings of N,S-CQDs (1.0 g, 1.5 g and 2.0 g) on TiO2 nanoparticles. Subsequently, the synthesized N,S-CQDs/TiO2 nanocomposites were deposited on the PSF membrane via in-situ phase inversion method. The membranes were evaluated for the photodegradation of 10 ppm of DCF under UV light and visible light irradiation. Different characterization techniques including FTIR, XRD, SEM-EDX and sessile drop analysis methods were employed to characterize the membranes. The 1.5 N,S-CQDs/TiO2 membrane exhibited the highest photodegradation performance among the membranes with 62.3% of DCF removal under visible light while the pure TiO2 membrane only showed 3.33% removal. The study showed that 1.5 g loading of N,S-CQDs on TiO2 had successfully shifted and broadening the light absorption wavelength from UV range to visible light range and enhanced the photodegradation performance. In addition, the 1.5 N,S-CQDs/TiO2 membrane showed improved hydrophilicity with the highest permeability of 277 L/m2.hr.bar. This study demonstrated that N,S-CQDs/TiO2 is a promising photocatalyst for the photocatalytic membrane fabrication.

Original languageEnglish
Article number101068
JournalJournal of Water Process Engineering
Volume33
DOIs
Publication statusPublished - Feb 2020

Fingerprint

Quantum Dots
Titanium oxides
Sulfur
Drug products
titanium
Semiconductor quantum dots
drug
Nitrogen
Carbon
sulfur
oxide
membrane
Membranes
Degradation
degradation
nitrogen
carbon
Pharmaceutical Preparations
Photolysis
Photodegradation

Keywords

  • Carbon dots
  • Pharmaceutical
  • Photocatalyst
  • Photocatalytic membrane
  • Visible light

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

Cite this

Novel nitrogen and sulphur co-doped carbon quantum dots/titanium oxide photocatalytic membrane for in-situ degradation and removal of pharmaceutical compound. / Koe, Weng Shin; Chong, Woon Chan; Pang, Yean Ling; Koo, Chai Hoon; Ebrahim, Mahmoudi; Mohammad, Abdul Wahab.

In: Journal of Water Process Engineering, Vol. 33, 101068, 02.2020.

Research output: Contribution to journalArticle

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abstract = "In this study, a novel photocatalytic membrane had been successfully fabricated through the incorporation of N,S-CQDs/TiO2 nanocomposite on polysulfone (PSF) membrane for the photodegradation of pharmaceutical compound namely diclofenac (DCF) in water. The N,S-CQDs/TiO2 nanocomposites were synthesized with different loadings of N,S-CQDs (1.0 g, 1.5 g and 2.0 g) on TiO2 nanoparticles. Subsequently, the synthesized N,S-CQDs/TiO2 nanocomposites were deposited on the PSF membrane via in-situ phase inversion method. The membranes were evaluated for the photodegradation of 10 ppm of DCF under UV light and visible light irradiation. Different characterization techniques including FTIR, XRD, SEM-EDX and sessile drop analysis methods were employed to characterize the membranes. The 1.5 N,S-CQDs/TiO2 membrane exhibited the highest photodegradation performance among the membranes with 62.3{\%} of DCF removal under visible light while the pure TiO2 membrane only showed 3.33{\%} removal. The study showed that 1.5 g loading of N,S-CQDs on TiO2 had successfully shifted and broadening the light absorption wavelength from UV range to visible light range and enhanced the photodegradation performance. In addition, the 1.5 N,S-CQDs/TiO2 membrane showed improved hydrophilicity with the highest permeability of 277 L/m2.hr.bar. This study demonstrated that N,S-CQDs/TiO2 is a promising photocatalyst for the photocatalytic membrane fabrication.",
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AB - In this study, a novel photocatalytic membrane had been successfully fabricated through the incorporation of N,S-CQDs/TiO2 nanocomposite on polysulfone (PSF) membrane for the photodegradation of pharmaceutical compound namely diclofenac (DCF) in water. The N,S-CQDs/TiO2 nanocomposites were synthesized with different loadings of N,S-CQDs (1.0 g, 1.5 g and 2.0 g) on TiO2 nanoparticles. Subsequently, the synthesized N,S-CQDs/TiO2 nanocomposites were deposited on the PSF membrane via in-situ phase inversion method. The membranes were evaluated for the photodegradation of 10 ppm of DCF under UV light and visible light irradiation. Different characterization techniques including FTIR, XRD, SEM-EDX and sessile drop analysis methods were employed to characterize the membranes. The 1.5 N,S-CQDs/TiO2 membrane exhibited the highest photodegradation performance among the membranes with 62.3% of DCF removal under visible light while the pure TiO2 membrane only showed 3.33% removal. The study showed that 1.5 g loading of N,S-CQDs on TiO2 had successfully shifted and broadening the light absorption wavelength from UV range to visible light range and enhanced the photodegradation performance. In addition, the 1.5 N,S-CQDs/TiO2 membrane showed improved hydrophilicity with the highest permeability of 277 L/m2.hr.bar. This study demonstrated that N,S-CQDs/TiO2 is a promising photocatalyst for the photocatalytic membrane fabrication.

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