ChemSusChem
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2019
·Vol. 12
·期 12
·2740-2747
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IF 7.804
Xiaoli Jin,Chade Lv,Xin Zhou,Liqun Ye,Haiquan Xie,Yue Liu,Huan Su,Biao Zhang,Gang Chen
Graphical Triple boost ! The high abundance of oxygen vacancies in Bi 24 O 31 Cl 10 play the following three roles for fully optimizing the CO 2 conversion efficiency: (i) enhance charge density, (ii) improve separation of electron–hole pairs, and (iii) lower energy for the formation of intermediates during the process. Unearthing an ideal model to describe the role of defect sites for boosting photocatalytic CO 2 reduction is rational and necessary, but it still remains a significant challenge. Herein, oxygen vacancies are introduced on the surface of Bi 24 O 31 Cl 10 photocatalyst (Bi 24 O 31 Cl 10 -OV) for fine-tuning the photocatalytic efficiency. The formation of oxygen vacancies leads to a new donor level near the conduction band minimum, which enables a faster charge transfer and higher carrier density. Moreover, oxygen vacancies can considerably reduce the energy for the formation of COOH* intermediates during CO 2 conversion. As a result, the activity of Bi 24 O 31 Cl 10 -OV for selective photoreduction of CO 2 to CO is significantly improved, with a CO generation rate of 0.9 μmol h −1 g −1 , which is nearly 4 times higher than that of pristine Bi 24 O 31 Cl 10 . This study reinforces our understanding of defect engineering in Bi-based photocatalysts and underscores the potential importance of implanting oxygen vacancies as an effective strategy for solar energy conversion.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Wei Chen,Yiran Liang,Zhili Chen,Yunxiang Zhang,Jian Wang,Xin Chen,Chenliang Zhou,Keshun Nie,Zhongjie Wang,Qinfang Zhang
Designing of an efficient heterojunction for the practical application of photocatalysis has been considered as the promising topic for the settle of the energy crisis and environmental pollution. Herein, a dual Bi 2 O 3 /BiOCl/Bi 24 O 31 Cl 10 ternary heterojunction has been constructed by the in-situ photoreduction technique for the photocatalytic degradation of rhodamine B (RhB) and tetracycline hydrochloride (TCH). The significant difference in the work function ( W f ) among Bi 2 O 3 , BiOCl, and Bi 24 O 31 Cl 10 leads to the formation of the space charge region (built-in electric field) around the heterojunction interface along with band bending, which facilitates the directional migration and spatial separation of photogenerated carriers and offers the strong redox capacity of photogenerated electrons and holes. This process is beneficial for the generation of active species of superoxide free radical ( ∙ O 2 − ) and the photo-generated hole (h + ). The optimized removal efficiencies of RhB and TCH for the ternary heterojunction were nearly 7.19 and 1.28 times higher than these for the pure Bi 24 O 31 Cl 10 , respectively. Furthermore, the involved vital reactive radicals, potential degradation pathway, and the eco-toxicity of intermediates over Bi 2 O 3 /BiOCl/Bi 24 O 31 Cl 10 are evaluated through the trapping experiment, LC-MS calculation, and toxicity analysis. This work demonstrates a new heterojunction photocatalyst for the elucidation of pollutant degradation mechanism.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Yunxiang Zhang,Yu Wang,Chenliang Zhou,Hazem Abdelsalam,Wei Chen,Li Huang,Zhichao Mu,Zhili Chen,Diab Khalafallah,Qinfang Zhang
High photogenerated carrier recombination rate and weak spectral response are the two main factors restricting photocatalytic activities of photocatalysts. In this work, a novel Ag/Bi 24 O 31 Cl 10 heterojunction has been developed by the in-situ photoreduction technique to address the preceding issues. Physicochemical properties of as-synthesized 0.7 wt% Ag/Bi 24 O 31 Cl 10 photocatalysts were investigated in detail. The Ag clusters can be seen as surface plasmon polaritons to light absorption capacity and photothermal effect, which was demonstrated via Raman and UV–Vis diffuse reflectance spectra (UV–Vis DRS). Density functional theory (DFT) calculations show that the additional unoccupied crystal orbital by the silver (Ag) will accelerate the charge separation where some of the excited electrons to the conduction band of Bi 24 O 31 Cl 1 0 will drift to these orbitals which in turn prevent charge recombination. Therefore, Ag metal cluster-decorated Bi 24 O 31 Cl 10 photocatalysts can be identified as electron trappers to boost the spatial separation of the photogenerated carrier, and finally, the CH 4 generation rate and the rhodamine b (RhB) degraded efficiency of Ag/Bi 24 O 31 Cl 10 photocatalysts are enhanced about 1.54 and 5.20 times, respectively. The Ag/Bi 24 O 31 Cl 10 composite photocatalyst retained high photocatalytic activities after four cycles indicating the stability and repeatability of the Ag/Bi 24 O 31 Cl 10 composite. This work aims to provide new insight into modifying ideal semiconductor materials for high photocatalytic activity.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Zhilin Li,Chongyue Jin,Chunmei Lv,Min Wang,Jin Kang,Shiyu Liu,Yuanhua Xie,Tong zhu
To further promote the visible-light photocatalytic efficiency of Bi 24 O 31 Cl 10 , g-C 3 N 4 /Eu(III) doped Bi 24 O 31 Cl 10 heterojunction composites (CN/Eu-BCO) were successfully synthesized via modified solution combustion and immersion-calcination method. The effects of Eu(III) dopants and g-C 3 N 4 coupling on the micro-structures and the photocatalytic efficiency of Bi 24 O 31 Cl 10 towards Rhodamine B (RhB) degradation were investigated in detail. The results displayed that Eu(III) doping and coupling with g-C 3 N 4 can largely promote the photocatalytic efficiency of Bi 24 O 31 Cl 10 . The photodegradation rate of RhB over 5CN/0.01Eu-BCO can reach to be 91.9% in 40 min, which was 8.46 folds of Bi 24 O 31 Cl 10 , 1.91 folds of 0.01Eu-BCO, and 1.72 folds of 5CN/BCO. The main radical species being responsible for RhB degradation were ● O 2 − and ● OH. Furthermore, 5CN/0.01Eu-BCO composite photocatalyst exhibited good reusability and stability.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Mengying Yang,Yunfan Jia,Yun Chen,Pengcheng Yan,Li Xu,Junchao Qian,Feng Chen,Henan Li
Photoelectrochemical (PEC) aptasensor is a promising analysis platform with high selectivity and sensitivity. Exploration of photoelectric active material with excellent photoelectric conversion efficiency is the key condition to design a PEC aptasensor with excellent sensitivity. Herein, a PEC aptasensor was designed and constructed by g-C 3 N 4 /Bi 24 O 31 Cl 10 heterojunction as photoelectric active material for realizing sensitive detecting enrofloxacin (ENR) antibiotic. The formation of heterojunction can facilitate separation and transfer of photogenerated carriers and reduce the recombination rate, leading to the enhancement of photocurrent response compared to that of individual semiconductor. The ENR aptamer was introduced as the specific recognition element to realize excellent selectivity of the PEC aptasensor. Because ENR-aptamer complex can block the transfer of charge, the ENR-PEC aptasensor presented the decreased photocurrent response with the increasing of ENR concentration without external voltage. The developed ENR-PEC aptasensor presented excellent sensitivity and selectivity for detecting ENR with a detection range from 0.5 to 100 fM and a low detection limit of 0.167 fM (S/N = 3). The ENR-PEC aptasensor with good reproducibility may be potential for the determination of the actual samples.
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
高影响因子
Journal of Environmental Sciences
·
2023
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IF 6.9
Man Yang,Zhenzhen Shi,Shaodong Sun,Bian Yang,Jie Cui,Jianing Li,Daqin Yun,Nian Lei
Developing heterojunction photocatalyst with well-matched interfaces and multiple charge transfer paths is vital to boost carrier separation efficiency for photocatalytic antibiotics removal, but still remains a great challenge. In present work, a new strategy of chloride anion intercalation in Bi 2 O 3 via one-pot hydrothermal process is proposed. The as-prepared Ta-BiOCl/Bi 24 O 31 Cl 10 (TBB) heterojunctions are featured with Ta-Bi 24 O 31 Cl 10 and Ta-BiOCl lined shoulder-by-shouleder via semi-coherent interfaces. In this TBB heterojunctions, the well-matched semi-coherent interfaces and shoulder-by-shoulder structures provide fast electron transfer and multiple transfer paths, respectively, leading to enhanced visible light response and improved photogenerated charge separation. Meanwhile, a type-II heterojunction for photocharge separation has been obtained, in which photogenerated electrons are drove from the CB (conduction band) of Ta-Bi 24 O 31 Cl 10 to the both of bilateral empty CB of Ta-BiOCl and gathered on the CB of Ta-BiOCl, while the photogenerated holes are left on the VB (valence band) of Ta-Bi 24 O 31 Cl 10 , effectively hindering the recombination of photogenerated electron-hole pairs. Furthermore, the separated electrons can effectively activate dissolved oxygen for the generation of reactive oxygen species (·O 2 − ). Such TBB heterojunctions exhibit remarkably superior photocatalytic degradation activity for tetracycline hydrochloride (TCH) solution to Bi 2 O 3 , Ta-BiOCl and Ta-Bi 24 O 31 Cl 10 . This work not only proposes a Ta-BiOCl/Bi 24 O 31 Cl 10 shoulder-by-shoulder micro-ribbon architectures with semi-coherent interfaces and successive type-II heterojunction for highly efficient photocatalytic activity, but offers a new insight into the design of highly efficient heterojunction through phase-structure synergistic transformation strategy.
研究领域:
材料科学
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环境科学
·
化学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2014
·
IF 6.007
Fa-tang Li,Qing Wang,Xiao-jing Wang,Bo Li,Ying-juan Hao,Rui-hong Liu,Di-shun Zhao
A facile and fast method was developed for the preparation of novel BiOCl/Bi 24 O 31 Cl 10 heterojunctions via a self-combustion of ionic liquids (ILs) route. The ILs were prepared from Bi(NO 3 ) 3 ·5H 2 O and diethylamine hydrochloride ((C 2 H 5 ) 2 NH·HCl). The photocatalysts were obtained by heating the ILs to combustion. In the ILs system, (C 2 H 5 ) 2 NH·HCl serves not only as the source of cation in IL, but also as the main fuel. The prepared composites exhibit noticeable visible light photocatalytic activity in the degradation of organic pollutants, including anionic dye methyl orange and cationic dye rhodamine B, which is attributed to the narrow band gap (2.3 eV) and the effective electrons transfer from the conductive band of Bi 24 O 31 Cl 10 to that of BiOCl, improving the separation efficiency of the photo-generated electron/hole pairs. The heterojunction containing 60.4% BiOCl and 39.6% Bi 24 O 31 Cl 10 exhibits the highest photocatalytic activity. The heterojunction shows dramatic adsorption performance for cationic dye rhodamine B because of its surface negative charges. The radical scavengers result shows that hole is the main reactive species responsible for the degradation of pollutants and superoxide radials are also involved in the photocatalytic process. The results obtained may provide a new sight for broadening the application of ILs in the preparation of nanomaterials and for the in-situ one-step synthesis of heterostructural materials.
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DOI
高影响因子
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