Hematite microcube decorated TiO2 nanorods as heterojunction photocatalyst with in-situ carbon doping derived from polysaccharides bio-templates hydrothermal carbonization

Mohamad Azuwa Mohamed, Nurashina Abdul Rahman, M. F. M. Zain, Lorna Jeffery Minggu, Mohammad B. Kassim, Juhana Jaafar, Shuaiba Samad, Mohd Sufri Mastuli, Roong Jien Wong

Research output: Contribution to journalArticle

Abstract

The novel in-situ formation of a heterojunction photocatalyst consisting of C-doped TiO2 nanorods decorated on the surface of C-doped α-Fe2O3 microcubes was successfully achieved using a one-pot hydrothermal carbonization synthesis. In this work, the treated kapok fibers (t-KF) used as a polysaccharide bio-template provided a dual function for crystal growth control and in-situ carbon doping of the heterojunction photocatalyst. It was found that the α-Fe2O3 precursor concentration plays an essential role in the unique and well-developed C-doped TiO2/α-Fe2O3 heterojunction formation. Assessment of photocatalytic activity of all samples indicated that the sample prepared with 0.25 M of α-Fe2O3 precursor concentration (BT-TF-0.25) exhibited the most efficient bisphenol A photodegradation in aqueous solution. The highest photocatalytic activity of BT-TF-0.25 under simulated solar irradiation was mainly associated with C-doping and favorable heterojunction formation between C-doped TiO2 and C-doped α-Fe2O3. Excellent charge carrier and separation were confirmed from the photocurrent response and photoluminescence spectroscopy analysis. Overall, this study is expected to contribute to the development of more efficient visible light active heterojunction photocatalyst systems, as well as demonstrating the versatility of polysaccharide materials as a green and low-cost bio-templates.

Original languageEnglish
Article number153143
JournalJournal of Alloys and Compounds
Volume820
DOIs
Publication statusPublished - 15 Apr 2020

Fingerprint

Hematite
Carbonization
Polysaccharides
Photocatalysts
Nanorods
Heterojunctions
Carbon
Doping (additives)
Photoluminescence spectroscopy
Photodegradation
Crystallization
Charge carriers
Photocurrents
Crystal growth
ferric oxide
Irradiation
Fibers
Costs

Keywords

  • Bio-templates
  • Bisphenol A
  • Charge separation
  • In-situ carbon doping
  • In-situ heterojunction formation
  • TiO/α-FeO

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Hematite microcube decorated TiO2 nanorods as heterojunction photocatalyst with in-situ carbon doping derived from polysaccharides bio-templates hydrothermal carbonization. / Mohamed, Mohamad Azuwa; Rahman, Nurashina Abdul; M. Zain, M. F.; Minggu, Lorna Jeffery; Kassim, Mohammad B.; Jaafar, Juhana; Samad, Shuaiba; Mastuli, Mohd Sufri; Wong, Roong Jien.

In: Journal of Alloys and Compounds, Vol. 820, 153143, 15.04.2020.

Research output: Contribution to journalArticle

Mohamed, Mohamad Azuwa ; Rahman, Nurashina Abdul ; M. Zain, M. F. ; Minggu, Lorna Jeffery ; Kassim, Mohammad B. ; Jaafar, Juhana ; Samad, Shuaiba ; Mastuli, Mohd Sufri ; Wong, Roong Jien. / Hematite microcube decorated TiO2 nanorods as heterojunction photocatalyst with in-situ carbon doping derived from polysaccharides bio-templates hydrothermal carbonization. In: Journal of Alloys and Compounds. 2020 ; Vol. 820.
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AU - Mohamed, Mohamad Azuwa

AU - Rahman, Nurashina Abdul

AU - M. Zain, M. F.

AU - Minggu, Lorna Jeffery

AU - Kassim, Mohammad B.

AU - Jaafar, Juhana

AU - Samad, Shuaiba

AU - Mastuli, Mohd Sufri

AU - Wong, Roong Jien

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N2 - The novel in-situ formation of a heterojunction photocatalyst consisting of C-doped TiO2 nanorods decorated on the surface of C-doped α-Fe2O3 microcubes was successfully achieved using a one-pot hydrothermal carbonization synthesis. In this work, the treated kapok fibers (t-KF) used as a polysaccharide bio-template provided a dual function for crystal growth control and in-situ carbon doping of the heterojunction photocatalyst. It was found that the α-Fe2O3 precursor concentration plays an essential role in the unique and well-developed C-doped TiO2/α-Fe2O3 heterojunction formation. Assessment of photocatalytic activity of all samples indicated that the sample prepared with 0.25 M of α-Fe2O3 precursor concentration (BT-TF-0.25) exhibited the most efficient bisphenol A photodegradation in aqueous solution. The highest photocatalytic activity of BT-TF-0.25 under simulated solar irradiation was mainly associated with C-doping and favorable heterojunction formation between C-doped TiO2 and C-doped α-Fe2O3. Excellent charge carrier and separation were confirmed from the photocurrent response and photoluminescence spectroscopy analysis. Overall, this study is expected to contribute to the development of more efficient visible light active heterojunction photocatalyst systems, as well as demonstrating the versatility of polysaccharide materials as a green and low-cost bio-templates.

AB - The novel in-situ formation of a heterojunction photocatalyst consisting of C-doped TiO2 nanorods decorated on the surface of C-doped α-Fe2O3 microcubes was successfully achieved using a one-pot hydrothermal carbonization synthesis. In this work, the treated kapok fibers (t-KF) used as a polysaccharide bio-template provided a dual function for crystal growth control and in-situ carbon doping of the heterojunction photocatalyst. It was found that the α-Fe2O3 precursor concentration plays an essential role in the unique and well-developed C-doped TiO2/α-Fe2O3 heterojunction formation. Assessment of photocatalytic activity of all samples indicated that the sample prepared with 0.25 M of α-Fe2O3 precursor concentration (BT-TF-0.25) exhibited the most efficient bisphenol A photodegradation in aqueous solution. The highest photocatalytic activity of BT-TF-0.25 under simulated solar irradiation was mainly associated with C-doping and favorable heterojunction formation between C-doped TiO2 and C-doped α-Fe2O3. Excellent charge carrier and separation were confirmed from the photocurrent response and photoluminescence spectroscopy analysis. Overall, this study is expected to contribute to the development of more efficient visible light active heterojunction photocatalyst systems, as well as demonstrating the versatility of polysaccharide materials as a green and low-cost bio-templates.

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