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Cao H, Yin Z, Dong X, Li Y, Yang Y, Qiu J, Yang Z, Song Z. Enhancing the near-infrared upconversion photocatalytic activity of ZnO/Bi 3Ti 2O 8F:Yb 3+, Er 3+ by modulating the internal electric field through Z-scheme heterojunction construction. J Colloid Interface Sci 2024; 674:79-91. [PMID: 38917714 DOI: 10.1016/j.jcis.2024.06.161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 06/20/2024] [Accepted: 06/22/2024] [Indexed: 06/27/2024]
Abstract
Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/Bi3Ti2O8F:Yb3+, Er3+ (ZnO/BTOFYE) Z-scheme heterojunction based on a Bi3Ti2O8F:Yb3+, Er3+ (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er3+ enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.
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Affiliation(s)
- Haomiao Cao
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Zhaoyi Yin
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Xiaoyi Dong
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Yongjin Li
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China.
| | - Yong Yang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Jianbei Qiu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Zhengwen Yang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China
| | - Zhiguo Song
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 50093, China.
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Xiong Y, He H, Cui Y, Wu ZM, Ding S, Zhang J, Peng B, Yang L. Tuning Surface Electronics State of P-Doped In 2.77S 4/In(OH) 3 toward Efficient Photoelectrochemical Water Oxidation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:8533-8541. [PMID: 38606693 DOI: 10.1021/acs.langmuir.4c00135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
Indium sulfide with a two-dimensional layered structure offers a platform for catalyzing water oxidation by a photoelectrochemical process. However, the limited hole holders hinder the weak intrinsic catalytic activity. Here, the nonmetallic phosphorus atom is coordinated to In2.77S4/In(OH)3 through a bridge-bonded sulfur atom. By substituting the S position by the P dopant, the work function (surface potential) is regulated from 445 to 210 mV, and the lower surface potential is shown to be beneficial for holding the photogenerated holes. In2.77S4/In(OH)3/P introduces a built-in electric field under the difference of Fermi energy, and the direction is from the bulk to the surface. This band structure results in upward band bending at the interface of In2.77S4/In(OH)3 and P-doped sites, which is identified by density functional theory calculations (∼0.8 eV work function difference). In2.77S4/In(OH)3/P stands out with the highest oxidation efficiency (ηoxi = 70%) and charge separation efficiency (ηsep = 69%). Importantly, it delivers a remarkable water oxidation photocurrent density of 2.51 mA cm-2 under one sun of illumination.
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Affiliation(s)
- Yuli Xiong
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Huichao He
- Institute of Environmental Energy Materials and Intelligent Devices, School of Metallurgy and Materials Engineering, Chongqing University of Science and Technology. Chongqing 401331, P. R. China
| | - Yuting Cui
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Zhi-Min Wu
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Shoubing Ding
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Jie Zhang
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Bo Peng
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, P. R. China
| | - Lin Yang
- Key Laboratory of Optoelectronic Technology and System of Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400030, P. R. China
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Guo Y, Chen X, Liu Y, Chen Z, Guo P, Luo D, Zhang M, Liu X. Inorganic-Organic Dual-Ligand-Regulated Photocatalysis of CdS@Zn xCd 1-xS@ZnS Quantum Dots for Lignin Valorization. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38419339 DOI: 10.1021/acsami.3c18957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
In a dual-functional lignin valorization system, a harmonious oxidation and reduction rate is a prerequisite for high photocatalytic performance. Herein, an efficient and facile ligand manipulating strategy to balance the redox reaction process is exploited via decorating the surface of the CdS@ZnxCd1-xS@ZnS gradient-alloyed quantum dots with both inorganic ligands of hexafluorophosphate (PF6-) and organic ligands of mercaptopropionic acid (MPA). Inorganic ion ligands in this system provide a promotion for intermediator reduction reactions. By optimizing the ligand composition on the quantum dot surface, we achieve precise control over the extent of oxidation and reduction, enabling selective modification of reaction products; that is, the conversion rate of 2-phenoxy-1-phenylethanol reached 99%. Surface engineering by regulating the ligand type demonstrates that PF6- and thiocyanate (SCN-) inorganic ion ligands contribute significantly toward electron transfer, while MPA ligands have beneficial effects on the hole-transfer procedure, which is predominantly dependent on their steric hindrance, electrostatic action, and passivation effect. The present study offers insights into the development of efficient quantum dot photocatalysts for dual-functional biomass valorization through ligand design.
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Affiliation(s)
- Yudong Guo
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
| | - Xiya Chen
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
| | - Yuxin Liu
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
| | - Zhenjun Chen
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
| | - Peiyuan Guo
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
| | - Dongxiang Luo
- Huangpu Hydrogen Innovation Center/Guangzhou Key Laboratory for Clean Energy and Materials, School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, P. R. China
| | - Menglong Zhang
- College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, P. R. China
| | - Xiao Liu
- Guangdong Provincial Key Laboratory of Chip and Integration Technology, School of Semiconductor Science and Technology, South China Normal University, Foshan 528225, P. R. China
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Huang J, Wu T, Dai C, Xie Y, Zeng C. Improved Charge Separation and CO 2 Affinity of In 2O 3 by K Doping with Accompanying Oxygen Vacancies for Boosted CO 2 Photoreduction. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 38340084 DOI: 10.1021/acs.langmuir.3c03854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
The CO2 photocatalytic conversion efficiency of the semiconductor photocatalyst is always inhibited by the sluggish charge transfer and undesirable CO2 affinity. In this work, we prepare a series of K-doped In2O3 catalysts with concomitant oxygen vacancies (OV) via a hydrothermal method, followed by a low-temperature sintering treatment. Owing to the synergistic effect of K doping and OV, the charge separation and CO2 affinity of In2O3 are synchronously promoted. Particularly, when P/P0 = 0.010, at room temperature, the CO2 adsorption capacity of the optimal K-doped In2O3 (KIO-3) is 2336 cm3·g-1, reaching about 6000 times higher than that of In2O3 (0.39 cm3·g-1). As a result, in the absence of a cocatalyst or sacrificial agent, KIO-3 exhibits a CO evolution rate of 3.97 μmol·g-1·h-1 in a gas-solid reaction system, which is 7.6 times that of pristine In2O3 (0.52 μmol·g-1·h-1). This study provides a novel approach to the design and development of efficient photocatalysts for CO2 conversion by element doping.
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Affiliation(s)
- Jiayang Huang
- Institute of Advanced Materials, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, PR China
| | - Tao Wu
- Institute of Advanced Materials, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, PR China
| | - Chunhui Dai
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation, East China University of Technology, Nanchang 330013, PR China
| | - Yunchang Xie
- Institute of Advanced Materials, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, PR China
| | - Chao Zeng
- Institute of Advanced Materials, College of Life Sciences, Jiangxi Normal University, Nanchang 330022, PR China
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Mei H, Wang Z, Jin D, Zhang R, Wang X. Constructing BiOBr 1-xI x-y with Abundant Surface Br Vacancies for Excellent Visible-Light Photodegradation Capability of High-Concentration Refractory Contaminants. Inorg Chem 2023; 62:12822-12831. [PMID: 37525121 DOI: 10.1021/acs.inorgchem.3c01457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
Bismuth oxybromide (BiOBr) is a promising photocatalytic semiconductor material due to its unique hierarchical structure and band structure. However, its photocatalytic applications are restricted due to its narrow visible-light absorption range and poor photooxidation capability. In this study, BiOBr1-xIx-y with rich surface Br vacancies (BrVs-rich BiOBr1-xIx-y) was created via a facile indirect substitution strategy. Benefiting from the broadened visible-light response range and reduced recombination rate of photogenerated carriers, BiOBr1-xIx-y shows excellent visible-light photodegradation ability for high-concentration refractory contaminants, such as phenol, tetracycline, bisphenol A, rhodamine B, methyl orange, and even real wastewater. At the same time, the Br vacancies can regulate the band structure of BiOBr1-xIx-y and serve as trap states to promote charge separation, thus facilitating surface photoredox reactions. An in-depth investigation of the Br vacancy effect and photodegradation mechanism was conducted. This novel study revealed the significance of Br vacancies in enhancing the photocatalytic performance of BiOBr under visible light, providing a promising strategy for improving the utilization efficiency of sunlight in wastewater treatment.
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Affiliation(s)
- Hao Mei
- School of Future Technology, Nanchang University, 999 Xuefu Road, Nanchang 330031, China
| | - Zhichen Wang
- School of Future Technology, Nanchang University, 999 Xuefu Road, Nanchang 330031, China
| | - Dai Jin
- School of Future Technology, Nanchang University, 999 Xuefu Road, Nanchang 330031, China
| | - Rongbin Zhang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry and Chemical Engineering, Nanchang University, 999 Xuefu Road, Nanchang 330031, China
| | - Xuewen Wang
- Key Laboratory of Jiangxi Province for Environment and Energy Catalysis, College of Chemistry and Chemical Engineering, Nanchang University, 999 Xuefu Road, Nanchang 330031, China
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