JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiaqian Zhu,Yinghua Shen,Xiang Yu,Jia Guo,Yi Zhu,Yuanming Zhang
Immobilized CdS/BiOCl film photocatalysts were successfully synthesized by a facile two-step hydrothermal-hydrolysis method. The structures, morphologies, photocatalytic properties and reusabilities of the samples were studied. The photocatalytic activities of CdS/BiOCl were significantly improved compared with pure BiOCl. The photocatalytic activity of 6% CdS/BiOCl was the highest and 10 times higher than pure BiOCl, which was attributed to the enhanced visible light absorption and the higher separation of photogenerated carriers. Besides, 6% CdS/BiOCl also showed good recycling performance. A new photocatalytic mechanism, totally different from other mechanisms of BiOCl-based heterostructures , was revealed. It was part of electrons on the conducting band of CdS rather than the transferred electrons on the conducting band of BiOCl that oxidized O 2 into O 2 − , and O 2 − together with h + on the valence band of CdS degraded organic pollutants. BiOCl did not generate electrons and holes, but only served as the electron transferer as electrons on the conducting band of CdS transferred to the conducting band of BiOCl, facilitating the separation of hole-electron pairs. This work provided a good reference for design and synthesis of film photocatalysts and new insights into photocatalytic mechanisms for heterostructures.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Wujian Zhang,Zhiling Huang,Lianyang Zhang,Yue Meng,Zheming Ni,Haodong Tang,Shengjie Xia
Defect (vacancy) engineering can modulate the catalyst surface atoms and electrons, which is a low-cost and effective modification strategy for Z-scheme heterojunction . In this paper, metal and non-metal double vacancies (V Zn+O ) Z-scheme heterojunction photocatalysts (BiOCl/ZnS−V Zn+O ) were synthesized for the degradation of norfloxacin (NOR) for the first time. The results show that the built-in electric field of BiOCl/ZnS−V Zn+O catalyst induces the directional migration of photogenerated carriers, which greatly improves the carrier migration and separation efficiency. The introduced nonmetallic (O) vacancies can lower the conduction band of BiOCl, while the metallic (Zn) vacancies can enhance the valence band of ZnS. Due to the synergistic efficiency formed by the double vacancies and Z-scheme heterojunction, BiOCl/ZnS−V Zn+O showed excellent performance in photodegradation of NOR (97.9% degradation rate of 20 mg/L NOR in 50 min photodegradation). In addition, the mechanism of action, intermediates and degradation pathways of photodegradation were discussed in detail.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Xiuhua Yan,Wenxuan Chen,Wen Xiao,Guiyun Yu,Haijun Hou,Chao Liu
The development of green, thorough and high-efficiency photocatalysts for tetracycline hydrochloride (TCH) degradation is a hot spot in environmental and energy fields. In this work, the H + -restacked H 4 Nb 6 O 17 nanotubes (RHNT) were incorporated with BiOCl plates to successfully construct RHNT/BiOCl (RTB) composites with the 1D/2D heterostructure, which was beneficial to the charge carrier separation. The introduction of oxygen vacancies in RTB composites could promote the effective separation of charge carriers and the generation of reactive active species. The performance of the as-synthesized samples was evaluated by TCH photodegradation under simulated solar light. Compared to RHNT and BiOCl, the RTB composites, with an optimal sample of RTB-7, showed the enhanced photocatalytic activity for TCH degradation. The characterization results revealed that the enhanced TCH photodegradation activity for RTB composites was due to the synergistic effect of heterojunction formation and oxygen vacancies. During TCH photodegradation for RTB-7, the active radical species were determined by the radical trapping experiments and EPR spectra. The possible TCH photodegradation pathways and mechanism over RTB-7 were explored based on the characterization results. This work offers an effective approach for the rational design and construction of 1D/2D heterostructured photocatalysts with a high efficiency.
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
Nano-Micro Letters
·
2025
·Vol. 17
·期 1
·1-16
·
IF 36.3
Peng Ting,Wang Yiqing,Dong Chung-Li,Nga Ta Thi Thuy,Wu Binglan,Wang Yiduo,Guan Qingqing,Zhang Wenjie,Shen Shaohua
BiOCl atomic layers (BOCNSs-i) were prepared by exfoliating hydrothermally synthesized BiOCl (BOCNSs) via ultrasonication in isopropanol for efficient photocatalytic CO 2 overall splitting to CO and O 2 .
The obtained BOCNSs-i photocatalyst exhibits a distinctly improved photocatalytic performance to stoichiometrically produce CO and O 2 at the ratio of 2:1, with the CO evolution rate reaching 134.8 µmol g −1 h −1 under simulated solar light (1.7 suns) and reaching 13.3 mmol g −1 h −1 under concentrated solar irradiation (34 suns).
With the thickness of BiOCl photocatalyst reducing to atomic layers, the charge carrier transfer and separation were enhanced by shortened transfer distance and the increased built-in electric field intensity, and electrons enriched Bi sites were exposed for activating CO 2 molecules.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Guoxing Li,Hai-Tao Ren,Liyan Liu,Bing-Chiuan Shiu,Mei-Chen Lin,Ching-Wen Lou,Ting-Ting Li
This paper reports the preparation of BiVO 4 /BiOCl heterojunction photobiosensors with high sensitivity, stability and selectivity for detecting changes in dopamine concentration. BiVO 4 with nanostructures was prepared by electrostatic spinning, however, BiVO 4 semiconductor material is susceptible to complex inhibition of photogenerated carriers due to structural defects affecting the detection performance of the sensor, in order to solve this problem, BiVO 4 /BiOCl heterogeneous structures were prepared by hydrothermal synthesis. Not only the result of improving the interfacial charge separation efficiency, the photocurrent density was increased to 0.4 μA, but also the high sensitivity of the BiVO 4 /BiOCl heterojunction photovoltaic material for the detection of dopamine was improved. The linear response range for dopamine detection was 1-13 μM (R 2 = 0.99079) and the detection limit was 0.134 μM (S/N = 3). In addition, selective detection was achieved in the presence of a number of common interferences within human plasma, and the photocurrent response was tested for stability after sustained visible light irradiation.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xinxin Yuan,Jieyi Yang,Yiyang Yao,Hui Shen,Yue Meng,Bo Xie,Zheming Ni,Shengjie Xia
Single-phase photocatalysts exhibit low performance of photocatalytic degradation of pollutants, which is mainly due to the fact that most intrinsic photocatalysts can only produce one active species for degradation reactions. In order to solve this problem, the 0D/2D Cu 2 O/BiOCl S-scheme heterojunction was successfully constructed through a facile hydrothermal route. The obtained 0D/2D Cu 2 O/BiOCl displays high catalytic activity for tetracycline (TC) photodegradation, and 90.3% of TC was photodegraded within 80 min, which is much better than that by pure Cu 2 O and BiOCl. The excellent photocatalytic activity can be ascribed to the formation of S-scheme heterostructures, which enables the photocatalyst to generate superoxide radicals and hydroxyl radicals, and at the same time, makes the oxidation potential more positive and the reduction potential more negative. It is further proved by the results of experimental characterization and theoretical calculation show that the built-in electric field between Cu 2 O and BiOCl is a key factor in inducing the path of S-scheme electron transmission. In addition, the effects of various reaction conditions, including catalyst dosage, pH value and reaction temperature, on the photodegradation of tetracycline were discussed in detail. The intermediates and degradation path were also discussed in detail by liquid chromatography-mass spectrometry.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Jinyan Cao,Jianjun Li,Wei Chu,Wanglai Cen
Manganese-doped bismuth oxychloride (Mn-BiOCl) photocatalysts were facilely synthesized for the photodegradation of metronidazole (MTZ), and the as-prepared Mn-BiOCl was systematically characterized. The results show that the introduction of Mn 2+ to BiOCl increases its MTZ removal efficiency through increasing its specific surface area, broadening its light absorption region, and facilitating photoinduced carrier separation. The enhancement of the optical properties is ascribed to the generation of an intermediate Mn 3p-O 2d energy level in the forbidden gap of Mn-BiOCl based on the density functional theory calculations. Mn-BiOCl also exhibited favorable stability and recyclability after four cycles. Moreover, the results of the quenching experiments indicate that superoxide radicals (O 2 − ), hydroxyl radicals (OH ) and holes ( h + ) participated in MTZ degradation over Mn-BiOCl, and the electron spin resonance (ESR) test demonstrated that more OH was generated in the Mn-BiOCl process than the BiOCl process. This was explained by the H 2 O adsorption energy and bond parameter on the photocatalyst’s surface. Finally, the photodegradation pathway of MTZ was elaborated based on the intermediate analysis, and a mechanism for the promotion of MTZ photodegradation through Mn-doping BiOCl was proposed.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
Science of Advanced Materials
·
2013
·Vol. 5
·期 8
·1024-1031
·
IF 2.509
Xiong Jinyan,Cheng Gang,Wang Runming,Yang Hao,Xiao Shengqiang,Chen Rong
Different bismuth oxychloride (BiOCl) nanosheets were successfully synthesized via a facile solvothermal process in different solvents. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and UV–vis diffuse reflection spectroscopy
(DRS) and nitrogen adsorption. The prepared sheet-like BiOCl products showed different optical properties, BET surface areas and photocatalytic activities on the degradation of Rhodamine B (RhB) under visible light irradiation (> 400 nm). More importantly, the as-synthesized BiOCl
nanosheets exhibited superior photocatalytic activities compared with commercial BiOCl and TiO2 under visible light irradiation. The visible-light-induced degradation of RhB over the as-synthesized BiOCl photocatalysts was mainly ascribed to the photosensitization process and their
layered structures.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanli Sun,Xueliang Wang,Hooi Ling Lee
A simple and economical precipitation process was used to in situ synthesize a heterojunction of BiOBr(110)/BiOCl(110). Numerous techniques, such as SEM, XRD , HRTEM , BET, FTIR, and XPS , verified the successful creation of the heterostructure. In particular, the heterostructures exhibited significantly enhanced photocatalytic degradation efficiency towards ceftazidime (CFZ). The degradation kinetic constant of CFZ by BiOBr(110)/BiOCl(110) (5:5) was three times higher than those of BiOBr and BiOCl. Additionally, a type I heterojunction was reasonably suggested following UV–vis DRS and VB-XPS investigations. DFT calculations indicated that an internal electric field (IEF) was created when electrons (e - ) on the BiOBr surface were transferred to BiOCl in the dark. Upon visible light illuminated, photoinduced-e - was transferred from the conduction band (CB) of BiOCl to that of BiOBr under the action of IEF. In contrast, holes (h + ) moved in the opposite direction, realizing the separation of e - /h + pairs. Three degradation pathways were deduced based on intermediate products (IPs) detection by HPLC-MS. Importantly, the heterojunction catalyst exhibited efficient catalytic performance across solutions with different pH and maintained great reusability during four cycles of photodegradation . Overall, the work revealed distinctive insights concerning the mechanism of antibiotic degradation with BiOBr(110)/BiOCl(110) heterojunction structures .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2011
·Vol. 14
·期 2
·700-707
·
IF 4.006
Kun Zhang,Dieqing Zhang,Jie Liu,Kuaixia Ren,Hui Luo,Yingjie Peng,Guisheng Li,Xibin Yu
Iodine-incorporated BiOCl (I–BiOCl) core–shell microspheres were for the first time fabricated using a one-step approach under atmospheric pressure. The morphology and compositional characteristics of the 3D hierarchitectures (HAs) of BiOCl were investigated by various techniques such as XRD, FESEM, TEM, EDS, XPS and PL. On the basis of observing the structure of BiOCl and iodine-containing BiOCl at different intervals of reaction time, a three-stage growth mechanism that involves an initial Ostwald ripening process followed by a self-assembly process is proposed. Meanwhile, iodine anions were utilized as both structure-directing agents for fabricating hollow, core–shell, solid structure and doped ions incorporated into the framework of the core–shell BiOCl spheres to extend the light adsorption edge to the visible light region. UV-vis spectra reveal that the band energies of the iodine anions-modified BiOCl (I–BiOCl) hierarchical hollow, core–shell, and solid samples (2.43 eV, 2.28 eV and 2.04 eV, respectively) exhibit obvious red-shifts with respect to that of the pure hollow BiOCl sample (3.23 eV). I–BiOCl without adding poly(vinylpyrrolidone) (PVP) was researched. This result demonstrated that the formation of the core–shell structure is induced by a synergetic effect by iodine and PVP. The specific surface area and porosity of the iodine anions-modified hierarchical BiOCl were also investigated by using nitrogen adsorption–desorption isotherms. The as-prepared I–BiOCl core–shell microspheres showed much higher photocatalytic activity than that of the reported TiO2−x−yNxFy(SC)-3 and Bi2WO6, which was evaluated by the degradation of phenol under visible light (λ > 420 nm) and Rhodamine-B (RhB) dye under visible light (λ > 420 nm) and sun-light irradiation.
研究领域:
材料科学
·
纳米技术
·
光催化化学
✓ 已验证
DOI
高影响因子
Chemical Physics Impact
·
2024
·
IF 3.8
Mingzhang Liang,Anze Shui,Mei Cai,Hulei Yu
Semiconductor photocatalysis is an efficient technique to degrade the pollutants from wastewater. Herein, the doping of elements and the construction of heterojunctions are used to expand the visible light region and improve the transfer of photogenerated electrons-holes. The La-ZnO/BiOCl (LZB) heterojunction has been synthesized via the hydrothermal method. Furthermore, LZB-0.30 heterojunction is found to possess the optimal photodegradation efficiency of 100 % for RhB solution under the visible light within 45 min. Its degradation rate is ten times faster than that of La-ZnO, owing to positive development of photostimulated charge carriers. In addition, the results demonstrate that LZB-0.30, as an ideal photocatalyst, has great potential applications in the treatment of contaminants, providing a feasible strategy for environmental protection.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Beijia Yuan,Liang Bao,Huaiwei zhang,Yong-jun Yuan
In this paper, carbon supported Bi 2 O 3 -BiOCl-Bi heterostructures were successfully synthesized via a facile and simple hydrothermal method. A series of structure and morphology testing clearly showed that carbon and metallic Bi were deposited on the surface margin of Bi 2 O 3 -BiOCl, which benefited the rapid transfer of internal photogenerated electrons. Photophysical experiments including electron paramagnetic resonance (EPR) and X-ray photoelectron spectroscopy (XPS) indicated that the amount of surface oxygen vacancies (OVs) was significantly increased, which act as reactive active sites and therefore effectively enhance the photocatalytic performance. The photocatalytic N 2 reduction yield of C@Bi 2 O 3 -BiOCl-Bi was remarkably improved to 400 μg·L −1 , which was 3.63 times higher than that of BiOCl. This research demonstrated a feasible strategy to construct advanced photocatalyst by incorporating defect-rich structures and surface engineering.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
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