Details
| Original language | English |
|---|---|
| Article number | 1128 |
| Pages (from-to) | 1-17 |
| Number of pages | 17 |
| Journal | CATALYSTS |
| Volume | 10 |
| Issue number | 10 |
| Publication status | Published - 1 Oct 2020 |
Abstract
A simplified ammonolysis method for synthesizing single phase TaON nanoparticles is presented and the resulting photoelectrochemical properties are compared and contrasted with as-synthesized Ta 2O 5 and Ta 3N 5 . The protocol for partial nitridation of Ta 2O 5 (synthesis of TaON) offers a straightforward simplification over existing methods. Moreover, the present protocol offers extreme reproducibility and enhanced chemical safety. The morphological characterization of the as-synthesized photocatalysts indicate spherical nanoparticles with sizes 30, 40, and 30 nm Ta 2O 5, TaON, and Ta 3N 5 with the absorbance onset at ~320 nm, 580 nm, and 630 nm respectively. The photoactivity of the catalysts has been examined for the degradation of a representative cationic dye methylene blue (MB) using xenon light. Subsequent nitridation of Ta 2O 5 yields significant increment in the conversion (ζ: Ta 2O 5 < TaON < Ta 3N 5) mainly attributable to the defect-facilitated adsorption of MB on the catalyst surface and bandgap lowering of catalysts with Ta 3N 5 showing > 95% ζ for a lower (0.1 g) loading and with a lamp with lower Ultraviolet (UV) content. Improved Photoelectrochemical performance is noted after a series of chronoamperometry (J/t), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) measurements. Finally, stability experiments performed using recovered and treated photocatalyst show no loss of photoactivity, suggesting the photocatalysts can be successfully recycled.
Keywords
- Methylene blue, Photocatalysis, Photoelectrochemistry, Ta N, Ta O, TaON
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: CATALYSTS, Vol. 10, No. 10, 1128, 01.10.2020, p. 1-17.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - A Selective Synthesis of TaON Nanoparticles and Their Comparative Study of Photoelectrochemical Properties
AU - Khanal, Vijay
AU - Soto-Harrison, Eric
AU - Chandra, Dhanesh
AU - Balayeva, Narmina O.
AU - Bahnemann, Detlef W.
AU - Subramanian, Vaidyanathan (Ravi)
N1 - Funding Information: The support from the Alexander von Humboldt foundation to R.S.V. is acknowledged. Notable contribution from Cara DuMonte as an undergraduate intern is also acknowledged. The assistance provided by Mojtaba Ahmedian with obtaining SEM and HRTEM images is gratefully acknowledged. The support of the National Science Foundation (CHE-1429768) for the purchase of the powder X-ray diffractometer is gratefully acknowledged.
PY - 2020/10/1
Y1 - 2020/10/1
N2 - A simplified ammonolysis method for synthesizing single phase TaON nanoparticles is presented and the resulting photoelectrochemical properties are compared and contrasted with as-synthesized Ta 2O 5 and Ta 3N 5 . The protocol for partial nitridation of Ta 2O 5 (synthesis of TaON) offers a straightforward simplification over existing methods. Moreover, the present protocol offers extreme reproducibility and enhanced chemical safety. The morphological characterization of the as-synthesized photocatalysts indicate spherical nanoparticles with sizes 30, 40, and 30 nm Ta 2O 5, TaON, and Ta 3N 5 with the absorbance onset at ~320 nm, 580 nm, and 630 nm respectively. The photoactivity of the catalysts has been examined for the degradation of a representative cationic dye methylene blue (MB) using xenon light. Subsequent nitridation of Ta 2O 5 yields significant increment in the conversion (ζ: Ta 2O 5 < TaON < Ta 3N 5) mainly attributable to the defect-facilitated adsorption of MB on the catalyst surface and bandgap lowering of catalysts with Ta 3N 5 showing > 95% ζ for a lower (0.1 g) loading and with a lamp with lower Ultraviolet (UV) content. Improved Photoelectrochemical performance is noted after a series of chronoamperometry (J/t), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) measurements. Finally, stability experiments performed using recovered and treated photocatalyst show no loss of photoactivity, suggesting the photocatalysts can be successfully recycled.
AB - A simplified ammonolysis method for synthesizing single phase TaON nanoparticles is presented and the resulting photoelectrochemical properties are compared and contrasted with as-synthesized Ta 2O 5 and Ta 3N 5 . The protocol for partial nitridation of Ta 2O 5 (synthesis of TaON) offers a straightforward simplification over existing methods. Moreover, the present protocol offers extreme reproducibility and enhanced chemical safety. The morphological characterization of the as-synthesized photocatalysts indicate spherical nanoparticles with sizes 30, 40, and 30 nm Ta 2O 5, TaON, and Ta 3N 5 with the absorbance onset at ~320 nm, 580 nm, and 630 nm respectively. The photoactivity of the catalysts has been examined for the degradation of a representative cationic dye methylene blue (MB) using xenon light. Subsequent nitridation of Ta 2O 5 yields significant increment in the conversion (ζ: Ta 2O 5 < TaON < Ta 3N 5) mainly attributable to the defect-facilitated adsorption of MB on the catalyst surface and bandgap lowering of catalysts with Ta 3N 5 showing > 95% ζ for a lower (0.1 g) loading and with a lamp with lower Ultraviolet (UV) content. Improved Photoelectrochemical performance is noted after a series of chronoamperometry (J/t), linear sweep voltammetry (LSV), and electrochemical impedance spectroscopy (EIS) measurements. Finally, stability experiments performed using recovered and treated photocatalyst show no loss of photoactivity, suggesting the photocatalysts can be successfully recycled.
KW - Methylene blue
KW - Photocatalysis
KW - Photoelectrochemistry
KW - Ta N
KW - Ta O
KW - TaON
UR - http://www.scopus.com/inward/record.url?scp=85091911547&partnerID=8YFLogxK
U2 - 10.3390/catal10101128
DO - 10.3390/catal10101128
M3 - Article
VL - 10
SP - 1
EP - 17
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 10
M1 - 1128
ER -