Nano Research
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2023
·Vol. 16
·期 7
·8871-8881
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IF 9.9
Zhang Kunfeng,Chen Hongxia,Pei Wenbo,Dai Hongxing,Li Junshan,Zhu Yongfa
Herein, a series of three-dimensionally ordered macroporous (3DOM) Bi 4 O 5 Br 2 photocatalysts with different macropore sizes were successfully fabricated via a polymethyl methacrylate (PMMA) template method. The photocatalytic activity for phenol degradation over 3DOM Bi 4 O 5 Br 2 first increased and then decreased with the rise in macropore size. Specifically, 3DOM Bi 4 O 5 Br 2 -255 (macropore diameter ca. 170 nm) exhibits the best photocatalytic activity in the static system, which is about 4.5, 7.3, and 11.9 times higher than those of bulk Bi 4 O 5 Br 2 , Bi 2 WO 6 , and g-C 3 N 4 , respectively. Meanwhile, high phenol conversion (75%) is also obtained over 3DOM Bi 4 O 5 Br 2 -255 in the flow system under full spectrum irradiation. Furthermore, 3DOM Bi 4 O 5 Br 2 -255 also shows strong mineralization capacity owing to the downward shift of valance band position (0.15 V) as compared with Bi 4 O 5 Br 2 . Total organic carbon (TOC) removal rate over 3DOM Bi 4 O 5 Br 2 -255 (62%) is much higher than that of Bi 4 O 5 Br 2 (17%). The enhancement in photocatalytic performance of 3DOM Bi 4 O 5 Br 2 -255 is attributable to its better phenol adsorption, O 2 activation, and charge separation and transfer abilities. This work combines the advantages of 3D structure and surface dangling bonds, providing new possibilities for designing highly efficient photocatalysts for pollutants removal.
研究领域:
环境科学
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材料科学
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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
·1280-1292
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IF 3.709
Zhiyang Zhang,Xinyan Xiao,Mingli Lu
BACKGROUND With the rapid development of industry and commerce, organic pollutants such as RhB are detrimental to human health and living environment. As a promising technology for treating the organic pollutants in wastewater, photocatalysis technology has received worldwide attention. For practical application, a novel photocatalyst with superior photocatalytic activity should be developed. RESULTS A novel Bi 4 O 5 Br 2 /BiOCl (BC2) heterojunction photocatalyst with 2D/2D structure was fabricated via a facile one-pot solvothermal method. Compared with pure Bi 4 O 5 Br 2 and BiOCl, the BC2 heterojunction exhibited enhanced photocatalytic performance which reached 91% photodegradation efficiency for RhB under 120 min irradiation of simulated solar-light at pH 7. And 99% RhB was degraded by BC2 under 60 min irradiation at pH 6. CONCLUSION According to experimental and characterization analytical results, the enhanced photocatalytic activity of Bi 4 O 5 Br 2 /BiOCl (BC2) heterojunction could be attributed to the following four points: (i) The BC2 heterojunction with excellent visible light response could effectively utilize the simulated solar-light. (ii) The more negative surface electronegativity of BC2 favored the adsorption of RhB during the photodegradation process. (iii) The 2D/2D BC2 heterojunction had large interface region and internal electric field, thus it displayed superior carriers transfer capability and enhanced charge separation efficiency. (iv) The carriers transfer mechanism of Z-scheme could hinder the recombination of photoinduced charge carriers and endow this photocatalyst with enough redox capacity to degrade RhB. Moreover, slightly acidic condition (pH 6) could promote degradation of RhB, due to the enhanced adsorption capacity of BC2 heterojunction. © 2022 Society of Chemical Industry (SCI).
研究领域:
环境科学
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材料科学
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
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IF 3.8
Yuqing Shi,Yuhang Li,Yumeng Xue
Photocatalytic technique is one of the clean and promising routes for wastewater purification. In this work, a different CuBi 2 O 4 /Bi 4 O 5 Br 2 Z-scheme heterojunction were successfully prepared via an in-situ mechanical agitation method. The 10 % CuBi 2 O 4 /Bi 4 O 5 Br 2 (10 % CBO/BOB) heterojunction showed the highest photocatalytic degradation activity for catechin, and ∼99.8 % catechin was degrade within 40 min visible light stimulation, which is (0.0757/min) about 6.2-folds and 8.8-folds to that of Bi 4 O 5 Br 2 (0.0122/min) and CuBi 2 O 4 (0.0086/min), The pH = 7 is the optimal reaction condition for catechin degradation. Besides, The photocatalytic degradation capacity of the 10 % CBO/BOB heterojunction displayed the positive and negative relationship to the dosage of catalyst and initial concentration of catechin, respectively. The enhanced photocatalytic activity of CuBi 2 O 4 /Bi 4 O 5 Br 2 Z-scheme heterojunction can be ascribed to the improvement of the charge separation and light utilization rate. The results of ESR and trapping experiments revealed that the ·O 2 − , h + and ·OH are the primarily reactive substances for catechin degradation. Additionally, the transfer pathway of the photogenerated charges in the CuBi 2 O 4 /Bi 4 O 5 Br 2 Z-scheme heterojunction as revealed by the ESR, Mott-Schottky curve and UV–Vis diffuse reflectance absorption spectroscopy. This work provide a new idea for designing and preparing the novel Bi 4 O 5 Br 2 -based photocatalyst for TCM wastewater purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Surfaces and Interfaces
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2025
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IF 6.3
Huanxian Shi,Xiaofei Zhang,Guolong Li,Yanlei Zhang,Zhishu Tang,Chongbo Zhao,Jing Sun,Jun Wan
The development of a recoverable photocatalyst with exceptional photocatalytic activity is an idea strategy for wastewater purification. In this study, a novel recoverable magnetic biochar/Bi 4 O 5 Br 2 heterojunction with high-efficient removal efficiency for polyphenolic compounds was successfully prepared. Under 30 min visible light irradiation, approximately 98 % of polyphenolic compounds (catechin) was effectively eliminated, which is ∼2.77-folds and 4-folds to that of pure Bi 4 O 5 Br 2 and magnetic biochar, respectively. The influence of catalyst dosage, solution pH and initial concentration of catechin on the removal efficiency of magnetic biochar/Bi 4 O 5 Br 2 heterojunction were systematically investigated. Furthermore, the degradation pathway of polyphenolic compounds was studied using a LC–MS. The mechanism investigations revealed that h + , ·O 2 − , and ·OH are the primary active substances responsible for polyphenolic compounds degradation. The enhanced removal rate of magnetic biochar/Bi 4 O 5 Br 2 heterojunction can be attributed to the synergistic effects of adsorption and photocatalytic reaction. Additionally, a n-p transfer pathway at the interface of the magnetic biochar/Bi 4 O 5 Br 2 heterojunction was proposed, which improved the efficiency of charge separation and transfer, resulting in the enhanced photocatalytic activity. This work provides a valuable insight into designing a recoverable and high-efficient biochar-based photocatalyst for pharmaceutical wastewater purification.
研究领域:
环境科学
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材料科学
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高影响因子
CRYSTENGCOMM
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2020
·Vol. 22
·期 35
·5871-5881
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IF 3.117
Zhaohui Wu,Min Wu,Zhongfu Li,Yue Pan,Junhao Qiu,Taige Li,Kaiqiang Xu,Shiying Zhang,Difa Xu,Manman Guo
In this study, the phase transition from tetragonal BiOBr to monoclinic Bi4O5Br2 was regulated in the presence of branched polyethyleneimine (BPEI) containing massive amino groups via a hydrothermal route. Based on the crystal phase of the products obtained at different concentrations of the BPEI and Br− sources, the relative concentration of BPEI (the concentration ratio of the BPEI and Br− sources, BPEI/Br−) played the decisive role in this phase transition. In particular, a BPEI/Br− value over 0.2 g mmol−1 with excessive BPEI was critical for the phase transition. Further, a reasonable theory referring the synergistic effect of the “drag force” and facet recognition of excessive BPEI underlying this phase transition was confirmed through a series of systematically designed experiments. The protonated amino groups from excessive BPEI could not only act as a “drag force” to extract the bromine ions from the solid-state BiOBr nanosheets but also recognize the (001) facet of BiOBr, thereby distorting the tetragonal structure of the BiOBr nanosheets and forming monoclinic Bi4O5Br2 nanosheets. This work provides a new insight and proof of the regulation of the phase transition of BiOBr to Bi4O5Br2.
研究领域:
材料科学
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化学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
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IF 9.446
Danjun Mao,Shanshan Ding,Lingjun Meng,Yuxuan Dai,Cheng Sun,Shaogui Yang,Huan He
The novel Bi-rich Bi 4 O 5 Br 2 with tunable morphologies of two-dimentional (2D) nanosheets (NSs), three-dimentional (3D) monodisperse layered microspheres (LMs) and hollow spheres (HSs) have been successfully synthesized via an ionic liquid-in-water (IL/W) microemulsion method. Surfactant TX-100 served as the stabilizer of the IL/W microemulsion, and its concentration significantly influenced the morphology and size of the resulting Bi 4 O 5 Br 2 crystal. Possible formation mechanisms have also been discussed. UV–vis diffuse-reflectance spectra and Density function theory (DFT) calculations indicated that Bi 4 O 5 Br 2 possessed stronger visible light adsorption and more negative conduction band minimum (CBM), which is beneficial to effectively activate molecular oxygen to produce O 2 − . The photocatalytic activity of Bi-rich Bi 4 O 5 Br 2 with varied shapes was investigated and compared with BiOBr for the removal of fungicide o-phenylphenol (OPP) and antibacterial agent norfloxacin (NOR) and tetracycline hydrochloride (TC) under visible light irradiation. The as-prepared Bi 4 O 5 Br 2 HSs and LMs possess higher photocatalytic efficiency than Bi 4 O 5 Br 2 and BiOBr NSs, which is attributed to the hollow/layered spherical structures and Bi-rich strategies. The O 2 − and h + are identified to be the major photoactive species during the photo-degradation process by scavenger experiments and EPR methods. This study is expected to provide a stepping stone to purposively design and explore other novel hollow structures with controllable morphology and enhanced photocatalytic activity.
研究领域:
材料科学
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环境科学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 3
·1977-1993
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IF 4.682
Weng Peijie,Cai Qing,Wu Huadong,Zhang Linfeng,Wu Kun,Guo Jia
The flower-like CQDs/ S -Bi 4 O 5 Br 2 composites photocatalyst with high visible-light response is prepared by adjusting bismuth-rich, S -doped, and introducing carbon quantum dots (CQDs) into the bismuth oxybromide (BiOBr). Particularly, the prepared C 10 /S 6 –Bi 4 O 5 Br 2 composite shows the highest degradation efficiency for the ciprofloxacin (CIP) under visible-light irradiation with the apparent rate constants k of 0.03798 min −1 , which is 26.3 times and 10.1 times higher than that of BiOBr and Bi 4 O 5 Br 2 , respectively. The sulfur doping leads to the increase of the specific surface area and decreases of the band gap but retains the original flower-like morphology of Bi 4 O 5 Br 2 . Compared to the pure Bi 4 O 5 Br 2 , CQDs/Bi 4 O 5 Br 2 , and S -Bi 4 O 5 Br 2 , the CQDs introduction and S -doping can improve both of the light absorption range and intensity, as well as the charge transfer efficiency for the C 10 /S 6 –Bi 4 O 5 Br 2 composites. Furthermore, because of the combination of the CQDs and S doped for the Bi 4 O 5 Br 2 composites, the separation efficiency of photo-generated carriers is improved with the recombination rate greatly reduced. Graphical Abstract
研究领域:
材料科学
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环境科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jianxin Liu,Rui Li,Xiang Zu,Xiaochao Zhang,Yunfang Wang,Yawen Wang,Caimei Fan
Photocatalysis can produce NH 3 using N 2 and H 2 O at room temperature and atmospheric pressure, which has been considering as a safe, clean, and sustainable NH 3 synthesis. However, the poor solubility and slow diffusion rate of N 2 in water severely limited the nitrogen activation efficiency. Herein, we solve this problem by developing a hydrophilic-hydrophobic structure photocatalyst with gas-liquid-solid triphase reaction interface, where hydrophilic Bi 4 O 5 Br 2 is deposited on the surface of hydrophobic ZIF-8 to form a novel Bi 4 O 5 Br 2 /ZIF-8 composite photocatalyst. Such triphase interface architecture allows the direct delivery of N 2 from gas phase to the photocatalytic reaction interface replaced the diffusion of N 2 through the liquid phase. This rapid supply of N 2 can efficiently capture photoinduced electrons, thereby promoting the utilization efficiency of photo-induced electrons and the nitrogen fixation activation. This novel Bi 4 O 5 Br 2 /ZIF-8(30%) composite photocatalyst with good triphase contact performance shows obviously improved photocatalytic nitrogen fixation activity 327.338 μmol·L −1 ·h −1 ·g −1 (3.6 times than that of Bi 4 O 5 Br 2 ). Furthermore, efficient molecular nitrogen activation by Bi 4 O 5 Br 2 /ZIF-8 further brings out an attractive potential to improve other gas-consumption reactions, such as CO 2 reduction, according to this concept of triphase direct contact.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
ACS Applied Nano Materials
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2024
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IF 5.3
Xiang Yu,Yuwei Mi,Zihan Gong,Yongfang Zhang,Lei Wang,Suyuan Zeng
Constructing heterojunctions is an effective strategy for increasing semiconductor photocatalytic activity. Herein, a Bi2O3/Bi4O5Br2 type-II heterojunction was synthesized using a simple one-pot solvothermal route. The 0-dimensional (0D) Bi2O3 nanoparticles are uniformly distributed within the 2D Bi4O5Br2 nanosheets with (101̅) facets dominantly exposed. In comparison with pure Bi2O3 and Bi4O5Br2, they show higher photocatalytic activity degradation of resorcinol (RO) and Rhodamine B (RhB). The Bi2O3/Bi4O5Br2 composite containing 10% Bi2O3 (BOB4) displays the best photocatalytic activity. For instance, compared with pure Bi4O5Br2 and Bi2O3, the k(RO) values of BOB4 (0.58 h–1) are 3.1 and 4.8 times higher. The enhanced photocatalytic activity is attributed to the formation of a large heterojunction interface that results from the homogeneous distribution of Bi2O3 nanoparticles in the Bi4O5Br2 nanosheet, which effectively enhances the photogenerated charge separation in a type-II mode. Major active species include superoxide radicals (•O2–), hydroxyl radicals (•OH), and holes (h+). In addition, the Bi2O3/Bi4O5Br2 photocatalysts exhibit outstanding resistance to inorganic ions, pH, water matrix, as well as outdoor sunlight and favorable stability and biocompatibility. This work presents a simple method to construct Bi-based heterojunction architectures for photoactivity improvement.
研究领域:
材料科学
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环境科学
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化学
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2021
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IF 7.312
Zhengqing Cai,Yining Huang,Haodong Ji,Wen Liu,Jie Fu,Xianbo Sun
A novel g-C 3 N 5 /Bi 4 O 5 Br 2 surface heterojunction was developed via in-situ growth of Bi-rich Bi 4 O 5 Br 2 on g-C 3 N 5 nanosheets. The optimal composite achieved 3.6- and 16.0- times of sulfathiazole (STZ) degradation activity when compared with pristine Bi 4 O 5 Br 2 and g-C 3 N 5 . The interlayer stacking morphology and extra nitrogen in triazine units significantly narrowed the conduction band of g-C 3 N 5 , which greatly promoted its visible utilization; while the bismuth-rich property of Bi 4 O 5 Br 2 prolonged the excited charge carrier lifetime. Both photoluminescence and electrochemical impedance spectroscopy analysis demonstrated that the type-II surface heterojunction (g-C 3 N 5 /Bi 4 O 5 Br 2 ) offered remarkable charge transfer and separation due to the matched energy band structure. The STZ degradation mechanism and pathways were proposed based on experiments and density functional theory calculation, and the contribution of reactive species for STZ degradation followed the order of O 2 ∙ - > h + > OH. Moreover, the toxicity evolution of STZ was evaluated, suggesting that sufficient mineralization is required to ensure safe discharge. The Box-Behnken experimental design methodology study revealed that g-C 3 N 5 /Bi 4 O 5 Br 2 exhibited high reactivity for antibiotics degradation under different water matrix. This study suggested that g-C 3 N 5 /Bi 4 O 5 Br 2 has great application potential for cost-effective remediation of persistent organic contaminants by using solar light.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Sciences
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2020
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IF 4.302
Yingying Chen,Ruiping Li,Yan Gu,Hailin Tian,Yingping Huang,Junsong Chen,Yanfen Fang,Changying Yang
Photocatalytic process represents a promising approach to overcome the pollution challenge associated with the antibiotics-containing wastewater. This study provides a green, efficient and novel approach to remove cephalosporins, particularly cefoperazone sodium (CFP). Bi 4 O 5 Br 2 was chosen for the first time to systematically study its degradation for CFP, including the analysis of material structure, degradation performance, the structure and toxicity of the transformation products , etc. The degradation rate results indicated that Bi 4 O 5 Br 2 had an excellent catalytic activity leading to 78% CFP removal compared with the pure BiOBr (38%) within 120 min of visible light irradiation. In addition, the Bi 4 O 5 Br 2 presents high stability and good organic carbon removal efficiency. The effects of the solution pH (3.12 - 8.75) on catalytic activity revealed that CFP was mainly photocatalyzed under acidic conditions and hydrolyzed under alkaline conditions. Combined with active species and degradation product identification, the photocatalytic degradation pathways of CFP by Bi 4 O 5 Br 2 was proposed, including hydrolysis, oxidation, reduction and decarboxylation . Most importantly, the identified products were all hydrolysis rather than oxidation byproducts transformed from the intermediate of β-lactam bond cleavage in CFP molecule, quite different from the mostly previous studies. Furthermore, the final products were demonstrated to be less toxic through the toxicity analysis. Overall, this study illustrates the detailed mechanism of CFP degradation by Bi 4 O 5 Br 2 and confirms Bi 4 O 5 Br 2 to be a promising material for the photodegradation of CFP.
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
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IF 19.503
Zhaohui Wu,Jie Shen,Nan Ma,Zhongfu Li,Min Wu,Difa Xu,Shiying Zhang,Wenhui Feng,Yongfa Zhu
Enhancing spatial charge separation efficiency through directional charge transfer is one of the vital strategies to improve the photocatalytic performances. Bi 4 O 5 Br 2 nanosheets with vertical aligned (11−3), (32−2), and (112) facets were constructed to achieve the efficient directional charge transfer and separation based on the distinctive electronic and band structures of different facets. That is, the photoexcited electrons migrate to the top surface of (11−3) facet of the Bi 4 O 5 Br 2 nanosheets, while the holes transfer to the lateral surface of (32−2) and (112) facets. As a result, such Bi 4 O 5 Br 2 nanosheets with vertical aligned facets has highly strengthened the visible-light photodegradation efficiency of bisphenol A (BPA), which is around 6 times higher than that of BiOBr nanosheets. This work provides new sight to rational design the facets of photocatalysts for effective separation of charge carriers and promoted photocatalytic performances.
研究领域:
材料科学
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环境科学
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纳米技术
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光催化
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DOI
高影响因子
危险品化学品经营许可证（带存储）