CHEMOSPHERE
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2021
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IF 7.086
Ran Ma,Sai Zhang,Xuewei Liu,Mingtai Sun,Jianzhong Cao,Jian Wang,Suhua Wang,Tao Wen,Xiangke Wang
Two-dimensional (2D) bismuth-based semiconductors have aroused intensive concern owing to their prominent photocatalytic activity for organic pollutants removal . In this work, a facile strategy for introducing oxygen vacancy in Bi-based oxyiodides (Bi x O y I z ) sheet-like architectures to activate molecular oxygen was proposed. The structure, photoelectric properties and visible light (λ > 420 nm) induced photocatalytic activities of these samples for decomposition of bisphenol A (BPA) were systematically characterized and evaluated. The as-prepared Bi 7 O 9 I 3 with a feeding Bi/I molar ratio of 1:1 exhibited the best photocatalytic activity comparable to those of similarly synthesized Bi 7 O 9 I 3 with other molar ratios and BiOIO 3 catalysts. The optimal Bi 7 O 9 I 3 achieved excellent photocatalytic activity with 99.6 % degradation efficiency of BPA within 20 min and superior structural stability with 95.1 % degradation retention over 5 cycling tests. In addition, the resulting Bi 7 O 9 I 3 sample displayed a high mineralization efficiency of BPA. Importantly, the plenty of oxygen vacancies (V o s) exsiting in Bi 7 O 9 I 3 played the dominant role in both accelerating electron transfer and activating molecular oxygen to facilitate the generation of superoxide radical (O 2 ·- ) and singlet oxygen ( 1 O 2 ), thereby proceeding oxidative degradation of BPA molecules during photoreactions. The efforts and attempts are also extendable to synthesis other 2D photocatalysts, providing potential for effective charge-carrier separation and molecular oxygen activation.
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
PubMed
高影响因子
WATER SCIENCE AND TECHNOLOGY
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2015
·Vol. 72
·期 12
·2122-2131
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IF 1.106
Xu MengMeng,Zhao YaLei,Yan QiShe
Bi 7 O 9 I 3 , a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi 7 O 9 I 3 . The result of SEM observation shows that the as-synthesized Bi 7 O 9 I 3 consists of a large number of micro-sheets with parallel rectangle structure. The optical test exhibited strong photoabsorption in visible light irradiation, with 617 nm of absorption edges. Moreover, the difference in the photocatalytic efficiency of as-prepared Bi 7 O 9 I 3 at different seasons of a whole year was investigated in this study. The chemical oxygen demand removal efficiency and concentration of NO 3 − and SO 4 2– of solution after reaction were also researched to confirm whether degradation of the pollutant was complete; the results indicated a high mineralization capacity of Bi 7 O 9 I 3 . The as-synthesized Bi 7 O 9 I 3 exhibits an excellent oxidizing capacity of sulfadiazine sodium and favorable stability during the photocatalytic reaction.
研究领域:
环境化学
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光催化
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材料科学
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环境污染治理
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药物降解
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DOI
高影响因子
APPLIED SURFACE SCIENCE
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2022
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IF 7.392
Lingli Zhu,Dekui Shen,Kai Hong Luo
The design and development of high-efficient photocatalysts are confined by the limited light-harvesting capacity and rapid electron-hole recombination. The Bi 7 O 9 I 3 nanosheets decorated by lignin-derived carbon quantum dots (CQDs) were prepared through a facile hydrothermal process, which was applied for the photocatalytic degradation of tetracycline hydrochloride (TC). The prepared CQDs/Bi 7 O 9 I 3 composite with 3% CQDs content (CQDs/Bi 7 O 9 I 3 -3) showed the optimal photocatalytic degradation efficiency of 100% for TC under 300 W Xe lamp irradiation within 45 min. The corresponding degradation rate was 0.08133 min −1 , which was 4.74 times higher than that of pure Bi 7 O 9 I 3 . The superoxide radicals ( O 2 − ) and holes (h + ) were identified as the key reactive species for TC degradation through the photocatalytic mechanism exploration. The photocatalytic activity of CQDs/Bi 7 O 9 I 3 -3 composite could maintain above 80% after five recycles of degradation reaction, signifying its outstanding stability and reusability. The superior photocatalytic performance of CQDs/Bi 7 O 9 I 3 -3 is explained by the enhanced sunlight harvesting ability, accelerated electron transfer, and the formation of reactive species after the incorporation of CQDs. This work offers a promising strategy for constructing high-performance and environmentally friendly photocatalysts for water pollution treatment through the decoration of biomass-derived CQDs.
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
SEPARATION AND PURIFICATION TECHNOLOGY
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2026
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IF 9.1
Ao Sun,Mingliang Sun,Sen Yang,Tianyi Yang,Hongwei Zhu,Erhan Qin,Cong Wang,Xin Li,Yan Xing
Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction was constructed for PNRR. • Ce doping modulates the Fermi level and strengthens the built-in electric field. • The enhanced BIEF promotes directional charge transfer across the heterojunction. • Strengthened charge separation improves photocatalytic N 2 fixation performance. • N 2 reduction proceeds via an associative distal reaction pathway. Photocatalytic nitrogen fixation offers a sustainable route for ammonia synthesis under ambient conditions, but its practical application is severely limited by inefficient charge separation and sluggish interfacial charge-transfer kinetics. Herein, we develop a Ce-doped Bi 7 O 9 I 3 /TiO 2 S-scheme heterojunction through dopant-mediated Fermi level engineering to strengthen the interfacial built-in electric field (BIEF) and enhance photocatalytic nitrogen fixation. The charge transfer behavior and N 2 reduction mechanism was investigated using photoelectrochemical measurements, Kelvin probe force microscopy (KPFM), ultraviolet photoelectron spectroscopy (UPS), theoretical calculations, and in situ FT-IR spectroscopy. Ce doping shifts the Fermi level of Bi 7 O 9 I 3 upward, thereby enlarging the Fermi level difference between Bi 7 O 9 I 3 and TiO 2 and strengthening the interfacial BIEF. The enhanced BIEF promotes directional interfacial charge transfer and suppresses photogenerated carrier recombination, leading to improved charge separation. Consequently, the optimized photocatalyst achieves an NH 3 production rate of 53.70 μmol g −1 h −1 in pure water, which is 8.21- and 3.76-fold higher than those of pristine Bi 7 O 9 I 3 and the undoped Bi 7 O 9 I 3 /TiO 2 heterojunction, respectively. In situ FT-IR spectroscopy and theoretical calculations indicate that the photocatalytic nitrogen reduction proceeds through an associative distal pathway. This work demonstrates that dopant-induced Fermi level engineering can effectively regulate interfacial electric fields and charge transfer behavior in S-scheme heterojunctions, providing a rational strategy for BIEF engineering in efficient photocatalytic nitrogen fixation. Download: Download high-res image (166KB) Download: Download full-size image
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DOI
高影响因子
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2022
·Vol. 97
·期 5
·1326-1335
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IF 3.709
Dandan You,Ming Li,Zhuren Pan,Zhenyang Yin,Ning Wang
BACKGROUND 2,4-Dichlorophenol (2,4-DCP) is widely used as a preservative, pesticide, germicide, etc. However, it is very damaging to organisms and the environment, and it is difficult to decompose because of its high stability. To improve the photocatalytic ability of photocatalysts for degrading hazardous substances, like 2,4-DCP, constructing heterojunction is an effective strategy because of its restraint of electron–hole recombination and extension of light absorption spectra. RESULTS A novel photocatalyst Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was successfully synthesized by one-step in-situ co-crystallization method. The formation of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 composite was confirmed by X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS), fourier transform infrared spectrometer (FTIR spectrometer) and transmission electron microscope (TEM). The obtained optimal composite exhibited an excellent photocatalytic performance of degrading 2,4-DCP with an efficiency of 95% under visible-light irradiation. The trapping experiments indicated that superoxide radicals, electrons, and singlet oxygen played vital roles in 2,4-DCP decomposition and confirmed the dual Z-scheme heterojunction structure of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 . Furthermore, the possible reaction pathway was deduced based on the trapping experiments and the intermediate products detected by liquid chromatography tandem mass spectrometry. CONCLUSION The photocatalytic performance of Bi 7 O 9 I 3 /BiOIO 3 /g-C 3 N 4 was enhanced because the more efficient separation and transfer of photogenerated charge carriers was achieved due to the formation of dual Z-scheme heterojunction. This work presented a simple and feasible synthesis method to prepare a ternary photocatalyst for improving the photocatalytic ability, and it can assist in further understanding the reaction mechanism of 2,4-DCP degradation. © 2022 Society of Chemical Industry (SCI).
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
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