Novel Bi2Sn2O7 quantum dots/TiO2 nanotube arrays S-scheme heterojunction for enhanced photoelectrocatalytic degradation of sulfamethazine

Huizhong Wu; Zhongzheng Hu; Ruiheng Liang; Oluchi V. Nkwachukwu; Omotayo A. Arotiba; Minghua Zhou

doi:10.1016/j.apcatb.2022.122053

Novel Bi₂Sn₂O₇ quantum dots/TiO₂ nanotube arrays S-scheme heterojunction for enhanced photoelectrocatalytic degradation of sulfamethazine

Huizhong Wu, Zhongzheng Hu, Ruiheng Liang, Oluchi V. Nkwachukwu, Omotayo A. Arotiba, Minghua Zhou

Chemical Sciences

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

The step-scheme (S-scheme) heterojunction of Bi₂Sn₂O₇ quantum dots (QDs)/TiO₂ nanotube arrays (NTAs) photoanodes were prepared for efficient and stable photoelectrocatalytic (PEC) degradation of sulfamethazine (SMT) at low potential and light-emitting diode (LED) illumination. In the Bi₂Sn₂O₇/TiO₂ NTAs system, the synergistic factor of photocatalysis (PC) and electrocatalysis (EC) reached 10.1. The elevated performance was attributed to improved light-harvest capability by the decorated TiO₂ NTAs with Bi₂Sn₂O₇ QDs, lower charge transfer resistance, more efficient photoexcited charge separation, and higher redox ability to produce photogenerated holes (h⁺) and reactive oxygen species (ROS) with great efficiency. The possible PEC mechanism of S-scheme Bi₂Sn₂O₇/TiO₂ NTAs was elucidated by experimental studies and density functional theory (DFT) calculations, which confirmed the establishment of the internal electric field (IEF) promoted carrier separation and transport. This research provides a feasible approach for fabricating superior PEC photoanodes as well as new insights into heterojunction design.

Original language	English
Article number	122053
Journal	Applied Catalysis B: Environmental
Volume	321
DOIs	https://doi.org/10.1016/j.apcatb.2022.122053
Publication status	Published - Feb 2023

Keywords

LED lamp
Photoelectrocatalysis
Quantum dots
S-scheme heterojunction
Sulfamethazine degradation mechanism

ASJC Scopus subject areas

Catalysis
General Environmental Science
Process Chemistry and Technology

Access to Document

10.1016/j.apcatb.2022.122053

Cite this

@article{78d38d33be574f9daf2d5de4de73ea2f,

title = "Novel Bi2Sn2O7 quantum dots/TiO2 nanotube arrays S-scheme heterojunction for enhanced photoelectrocatalytic degradation of sulfamethazine",

abstract = "The step-scheme (S-scheme) heterojunction of Bi2Sn2O7 quantum dots (QDs)/TiO2 nanotube arrays (NTAs) photoanodes were prepared for efficient and stable photoelectrocatalytic (PEC) degradation of sulfamethazine (SMT) at low potential and light-emitting diode (LED) illumination. In the Bi2Sn2O7/TiO2 NTAs system, the synergistic factor of photocatalysis (PC) and electrocatalysis (EC) reached 10.1. The elevated performance was attributed to improved light-harvest capability by the decorated TiO2 NTAs with Bi2Sn2O7 QDs, lower charge transfer resistance, more efficient photoexcited charge separation, and higher redox ability to produce photogenerated holes (h+) and reactive oxygen species (ROS) with great efficiency. The possible PEC mechanism of S-scheme Bi2Sn2O7/TiO2 NTAs was elucidated by experimental studies and density functional theory (DFT) calculations, which confirmed the establishment of the internal electric field (IEF) promoted carrier separation and transport. This research provides a feasible approach for fabricating superior PEC photoanodes as well as new insights into heterojunction design.",

keywords = "LED lamp, Photoelectrocatalysis, Quantum dots, S-scheme heterojunction, Sulfamethazine degradation mechanism",

author = "Huizhong Wu and Zhongzheng Hu and Ruiheng Liang and Nkwachukwu, {Oluchi V.} and Arotiba, {Omotayo A.} and Minghua Zhou",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier B.V.",

year = "2023",

month = feb,

doi = "10.1016/j.apcatb.2022.122053",

language = "English",

volume = "321",

journal = "Applied Catalysis B: Environmental",

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publisher = "Elsevier",

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AU - Wu, Huizhong

AU - Hu, Zhongzheng

AU - Liang, Ruiheng

AU - Nkwachukwu, Oluchi V.

AU - Arotiba, Omotayo A.

AU - Zhou, Minghua

PY - 2023/2

Y1 - 2023/2

N2 - The step-scheme (S-scheme) heterojunction of Bi2Sn2O7 quantum dots (QDs)/TiO2 nanotube arrays (NTAs) photoanodes were prepared for efficient and stable photoelectrocatalytic (PEC) degradation of sulfamethazine (SMT) at low potential and light-emitting diode (LED) illumination. In the Bi2Sn2O7/TiO2 NTAs system, the synergistic factor of photocatalysis (PC) and electrocatalysis (EC) reached 10.1. The elevated performance was attributed to improved light-harvest capability by the decorated TiO2 NTAs with Bi2Sn2O7 QDs, lower charge transfer resistance, more efficient photoexcited charge separation, and higher redox ability to produce photogenerated holes (h+) and reactive oxygen species (ROS) with great efficiency. The possible PEC mechanism of S-scheme Bi2Sn2O7/TiO2 NTAs was elucidated by experimental studies and density functional theory (DFT) calculations, which confirmed the establishment of the internal electric field (IEF) promoted carrier separation and transport. This research provides a feasible approach for fabricating superior PEC photoanodes as well as new insights into heterojunction design.

AB - The step-scheme (S-scheme) heterojunction of Bi2Sn2O7 quantum dots (QDs)/TiO2 nanotube arrays (NTAs) photoanodes were prepared for efficient and stable photoelectrocatalytic (PEC) degradation of sulfamethazine (SMT) at low potential and light-emitting diode (LED) illumination. In the Bi2Sn2O7/TiO2 NTAs system, the synergistic factor of photocatalysis (PC) and electrocatalysis (EC) reached 10.1. The elevated performance was attributed to improved light-harvest capability by the decorated TiO2 NTAs with Bi2Sn2O7 QDs, lower charge transfer resistance, more efficient photoexcited charge separation, and higher redox ability to produce photogenerated holes (h+) and reactive oxygen species (ROS) with great efficiency. The possible PEC mechanism of S-scheme Bi2Sn2O7/TiO2 NTAs was elucidated by experimental studies and density functional theory (DFT) calculations, which confirmed the establishment of the internal electric field (IEF) promoted carrier separation and transport. This research provides a feasible approach for fabricating superior PEC photoanodes as well as new insights into heterojunction design.

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KW - Sulfamethazine degradation mechanism

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