APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Yi Zhong,Chenglin Wu,Daimei Chen,Jinzhong Zhang,Yanmei Feng,Kang Xu,Weichang Hao,Hao Ding,Guocheng Lv,Yi Du,Lianzhou Wang
As 2D heterojunction photocatalysts, lateral heterojunctions (LHs) formed based on chemical bonding generally exhibit much higher photocarrier separation efficiency than vertical heterojunctions (VHs) formed by van der Waals bonds. However, little is known about the different detailed interfacial structures and photocarrier separation mechanisms of the two heterojunctions. Herein, 2D BiOCl and Bi 4 O 5 I 2 were selected as model building blocks to construct BiOCl/Bi 4 O 5 I 2 VHs and LHs. The LHs with direct charge carrier transport channels show stronger interfacial electric field and higher charge transfer efficiency than the VHs. The photogenerated charge carrier migration pathway in the LHs follows a Z-scheme model, while the VHs fits a type II model. As a result, the BiOCl/Bi 4 O 5 I 2 LHs exhibited higher redox performance than the VHs, which is 1.55, 1.56 and 2.1 times better for H 2 production, Cr(VI) photoreduction and phenol photodegradation , respectively. This study demonstrates a new approach to constructing highly efficient facet-dependent 2D heterojunction photocatalysts.
研究领域:
材料科学
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光催化
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2013
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IF 5.825
Xin Xiao,Chunlan Xing,Guangping He,Xiaoxi Zuo,Junmin Nan,Lishi Wang
A facile solvothermal route is successfully developed to synthesize Bi 4 O 5 I 2 , a novel I-poor bismuth oxyiodide, with hierarchical nanoflake structure. The composition, structure, morphology, formation mechanism, photoabsorption, energy band, and photocatalytic properties of this material are systematically investigated. The results reveal that highly pure Bi 4 O 5 I 2 can be easily obtained by reacting Bi 3+ , I − , and OH − at pH values of 6 to 10 under solvothermal conditions, and the formation of such hierarchical structure can be explained by a dissolution–recrystallization mechanism. The as-synthesized Bi 4 O 5 I 2 nanoflakes show a favorable energy band structure (bandgap energy 2.17 eV, conduction band edge potential is more negative than the reduction potential of superoxide radicals), a high specific surface area (38.6 m 2 g −1 ), and a hierarchical micro/nano structures. Thus, they exhibit superior photocatalytic and mineralization efficiency for the degradation of 4- tert -butylphenol (PTBP, a representative alkylphenol) under visible light irradiation, with a reaction rate is 6.8 and 57 times faster than that of BiOI microspheres and N-doped TiO 2 , respectively. The photogenerated reactive species and degradation intermediates are identified, and possible photocatalytic mechanism is proposed. What's more, the as-synthesized Bi 4 O 5 I 2 nanoflakes remain stable during the photocatalytic reaction and can be used repeatedly, revealing their promising applications in the treatment of organic wastewaters.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Jinru Lin,Pengfei Zhu,Mei Liu,Ming Duan,Han Lu,Zhaoxin Huang
An all-solid-state Z-scheme Bi 4 O 5 I 2 /GO/Bi 2 Sn 2 O 7 (BI41/1.5GO/BS41) ternary heterojunction was constructed by hydrothermal-ultrasonic assisted aqueous precipitation-heat treatment method. Taking the degradation effect of tetracycline hydrochloride (TC-HCl) as a reference, the BI41/1.5GO/BS41 composite catalyst exhibits the best photocatalytic performance, and its photocatalytic reaction rate constant is 3.82 that of Bi 2 Sn 2 O 7 . When the dosage of BI41/1.5GO/BS41 was 0.8 g/L, the degradation rate of TC-HCl solution with initial concentration of 15 mg/L was 90.31 % (pH=8) under visible light irradiation for 120 min. Moreover, the BI41/1.5GO/BS41 also has excellent salt tolerance, universality and recycling stability. The free radical capture experiments and electron paramagnetic resonance (EPR) tests found that •O 2 and h + were the main active substances for photocatalytic degradation of TC-HCl. The characterization results show that the improvement of photocatalytic performance of BI41/1.5GO/BS41 is due to the successful construction of all-solid-state Z-scheme heterojunction with graphene oxide (GO) as an electron transport medium, which not only reduces the transfer resistance of photogenerated electrons but also improves the separation efficiency of photogenerated carriers. Finally, the TC-HCl solution after visible light degradation was detected by the liquid chromatography mass spectrometry (LC-MS), and the possible intermediate products and degradation pathways were speculated. This work provides a new perspective on the application of all-solid-state Z-scheme heterojunction photocatalysts to environmental remediation.
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 COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Yanyu Song,Xianbo Sun,Long D. Nghiem,Jun Duan,Wen Liu,Yongdi Liu,Zhengqing Cai
Building a heterojunction is a fascinating option to guarantee sufficient carrier separation and transfer efficiency, but the mechanism of charge migration at the heterojunction interface has not been thoroughly studied. Herein, MIL-53(Fe)/Bi 4 O 5 I 2 photocatalyst with a Z-scheme heterojunction structure is constructed, which achieves efficient photocatalytic decontamination under solar light. Driven by the newly-built internal electric field (IEF), the formation of Fe-O-Bi electron migration channel allows for rapid separation and transfer of charge carriers at the heterojunction interface, confirmed by the material characterization and density functional theory (DFT) calculation. The narrower band gap and improved visible light response also contribute to the enhanced photocatalytic activity of composite materials. With levofloxacin as the target pollutant, the optimal MIL-53(Fe)/Bi 4 O 5 I 2 achieves complete removal of pollutant within 150 min, the photocatalysis rate of which is ca. 4.4 and 26.0 times that of pure Bi 4 O 5 I 2 and MIL-53(Fe), respectively. Simultaneously, the optimal composite material exhibits satisfactory photodegradation of seven fluoroquinolones, and the photocatalysis rates are as follows: lomefloxacin > ciprofloxacin > enrofloxacin > norfloxacin > pefloxacin > levofloxacin > marbofloxacin. DFT calculations reveal a positive relationship between degradation rate and Fukui index (ƒ 0 ) of main carbon atoms in seven fluoroquinolones. This study sheds light on the existence of electron migration channels at Z-scheme heterojunction interface to ensure sufficient photoinduced carrier transfer, and reveals the influence of pollutant structure on photolysis rate.
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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光化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Tianxing Cui,Yumei Su,Xionghui Fu,Yi Zhu,Yuanming Zhang
Herein, we fabricated hydroxyl groups decorated Bi 4 O 5 I 2 nanosheets, and the contents of hydroxyl groups on the surface could be controlled by changing the reducibility of organic solvents. The stronger reducibility of organic solvents, the more hydroxyl groups on the surface. The hydroxyl groups on the surface of Bi 4 O 5 I 2 nanosheets have significant effects on photocatalytic activity. For degradation of organic pollutants, the surface hydroxyls form hydrogen bonds with organic pollutants, which is conducive to the adsorption of the substrates. For NO removal, the NO adsorbed on the hydroxyl groups is more oxidized into a toxic by-product NO 2 instead of NO 3 - , so less hydroxyl groups are important for photocatalysts towards NO removal. These new discoveries provide new insights to improve photocatalytic activities by modulating surface functional groups of photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
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2023
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IF 3.8
Huijuan Zhang,Wenyan Luo,Zaichun Sun,Chunya Li
Bismuth oxyiodides have been gradually regarded as a kind of promising optoelectronic material, owing to their various merits, like relatively narrow and tunable band gap, high anisotropic crystal structure, and less toxicity. However, the investigation of bismuth oxyiodide-based photodetectors is still in the early stage, which might be attributed to the immature film deposition techniques in controlling their phase composition and surface morphology. In this work, high-quality Bi4O5I2 thin films were synthesized for the first time by a facile solution-based deposition technique, mist chemical vapor deposition. The synthesized Bi4O5I2 thin films were composed of vertically aligned nanoplatelets. With the increasing synthesis temperatures, the size of the nanoplates and film thickness increased. The iodide content was influenced by the synthesis temperatures such that the I:Bi molar ratio for the Bi4O5I2 thin films at intermediate temperature was close to 50%. The Bi4O5I2 photoelectrochemical (PEC)-type photodetectors were fabricated and exhibited excellent photodetection performance with the highest responsivity of 19.4 mA/W and detectivity of 3.54 × 1010 Jones. In addition, Bi4O5I2 PEC-type photodetectors presented good long-term stability in that the photocurrent density only decreased by around 25% after 6 h, which was superior to most 2D material-based PEC-type photodetectors. These results demonstrated that the Bi4O5I2 thin film has great potential in high-performance optoelectronic devices.
研究领域:
材料科学
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光电子学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2026
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IF 6.3
Xiang Li,Qiyao Li,Ping Du,Yunzhu Wang,Sufang He,Nengsheng Liu,Chunxia Liu
Covalent organic frameworks (COFs) are promising materials for wastewater purification owing to their wide photoresponse range, abundant active sites, adjustable porosity, and efficient electron transfer. In this work, a novel S-scheme heterojunction was constructed by coupling bismuth-rich bismuth iodide oxide Bi 4 O 5 I 2 with functional β-ketoenamine COFs (TATP) via in-situ solvothermal reaction. The optimized composite 2-TPBI exhibits enhanced photocatalytic activity, achieving 88.55 % TC removal within 120 min under visible light irradiation. This performance enhancement is attributed to improved light absorption and efficient spatial separation of photogenerated charge carriers by the S-scheme heterojunction. This work opened up a new avenue for designing high-performance heterostructured photocatalysts through an inorganic/organic coupling strategy for efficient wastewater remediation.
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Yakun Zhang,Haijin Liu,Jianbiao Peng,Jiao Guo,Li Ding,Xin Cao,Yu Chang,Wissem Ben Soltan,Guoguang Liu
For this study, a Sb 2 WO 6 /Bi 4 O 5 I 2 composite material was successfully prepared via a precipitation-calcination method. The Sb 2 WO 6 /Bi 4 O 5 I 2 heterostructure enhanced the light absorption and facilitated the separation of charge carriers. Under simulated sunlight exposure, the removal rates of tetracycline (TC) and doxycycline hyclate (DOX·HCl) reached 88.2% and 83.9%, respectively, over an optimized SWB2 composite (theoretical mole ratio of Sb 2 WO 6 : BiOI was 1.5:10). Further, the total organic carbon (TOC) removal rates were 37.6% and 33.7%, respectively. The experiments explored various parameters including catalyst dosage, initial concentrations of TC and DOX·HCl, solution pH, and common inorganic ions. The TC and DOX·HCl degradation pathways were speculated. Furthermore, SWB2 demonstrated remarkable stability and cyclability under simulated sunlight. Trapping experiments and electron paramagnetic resonance (EPR) tests revealed that •O 2 - played a major role as a free radical in the photocatalytic process, while h + and •OH also had significant contributions. Based on in-situ XPS, trapping experiments, EPR test, band bending analysis, and SPV tests, the formation of S-scheme heterojunction between Sb 2 WO 6 and Bi 4 O 5 I 2 was inferred. This study provides insights into the design strategy of S-scheme heterojunctions between Aurivillius-type compounds and bismuth-rich halide bismuth oxide , which is informative for the development of advanced environmental remediation concepts.
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DOI
高影响因子
OPTICAL MATERIALS
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2024
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IF 3.8
Junzhao Wang,Limin Wang,Chengzhi Chu
In this paper, bismuth-rich three-dimensional Bi 4 O 5 I 2 /BiOBr hollow flower spheres were prepared by a one-pot solvothermal method. The anionic contaminant Rhodamine B (RhB) was used as the photocatalytic test contaminant. The results showed that the degradation rate of RhB was more than 99 %. Then Br element was introduced into Bi 4 O 5 I 2 hollow flower balls, the diameter of flower balls decreased and flowers sparsely. With the increase of Br content, flower balls gradually increased in volume and became denser. Small and sparse flower balls increase the specific surface area of flower balls and increase the number of active sites, thus improving the REDOX capacity of photogenerated electrons and holes. Our findings suggest that both holes (h + ) and superoxide radical anions (•O 2 − ) are crucial players during photocatalysis. The aim of this study is to develop an efficient photocatalyst for the degradation of organic pollutants, and its photocatalytic mechanism is described theoretically.
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
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Chao Wang,Baokang Dang,Hanwei Wang,Yipeng Chen,Yushan Yang,Yingying Li,Ye Xiong
The assembly of heterogeneous photocatalysts with unique structures by 2D heterojunctions is an advanced strategy for efficient solar energy conversion. However, heterogeneous photocatalysts constructed from 2D materials will suffer from high photogenerated charge recombination and low light absorption due to the arbitrary stacking and weak bonding of lamellae. Here, flower-like Bi 4 O 5 I 2 / β -Bi 2 O 3 (FL-Bi 4 O 5 I 2 / β -Bi 2 O 3 ) heterojunctions are developed in situ using FL-δ-Bi 2 O 3 as the starting material. It is noteworthy that the basic compositional form of the material was well maintained throughout the synthesis. Besides, due to the random reaction of iodide ions with the exposed surface of δ-Bi 2 O 3 , multiple heterogeneous regions are displayed on the basic lamellar units constituting the Bi 4 O 5 I 2 /β-Bi 2 O 3 nanoflowers. Theoretical and experimental results reveal that FL-Bi 4 O 5 I 2 /δ-Bi 2 O 3 possesses not only improved photogenerated carrier separation, enhanced light harvesting, but also considerable CO 2 adsorption. Importantly, FL-Bi 4 O 5 I 2 / β -Bi 2 O 3 achieves S-scheme CO 2 conversion due to its reasonable energy band structure, and with the CO generation rate of up to 31.74 μmol g −1 h −1 under simulated sunlight.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Guangdong Wu,Juanqin Xue,Zhaoyuan Cao,Yanyan Zhou,Qiang Bi,Yan Zhao,Zhihua Leng
Constructing heterojunction photocatalysts that can make additional utilization of near-infrared (NIR) light has been a global scientific problem and has gained widespread research interest. Upconversion nanoparticles (UCNPs) collaborate with semiconductors to construct UCNPs-based photocatalysts that are used to improve solar energy utilization. In this work, the as-prepared UCNPs-based photocatalysts consisting of NaGdF 4 :Yb 3+ /Er 3+ (NGFYE) and bismuth oxyiodide (BOI) are synthesized by chemical epitaxial growth method and in-situ calcination process. The crystalline phase , morphology, optical and electrochemical properties of NGFYE@BOI samples are investigated in detail. Besides, Bi 4 O 5 I 2 /Bi 5 O 7 I Z-type heterojunction is confirmed by EPR test. Moreover, the photocatalytic elimination of tetracycline hydrochloride (TCH) and its photocatalytic mechanism by NGFYE@BOI samples are explored. This work may provide a promising idea for the efficient and controlled synthesis of UCNPs-based photocatalysts, which will contribute to the future utilization of solar energy.
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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产品关联
DOI
高影响因子
OPTICAL MATERIALS
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2026
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IF 4.3
Chunyang Han,Yao Liu,Dong Zhao,Zhao Li,Qian Zhang,Huiqiang Liu,Yue Zhao,Yunyan Liu
A novel Bi 4 O 5 I 2 /BiOBr Z-scheme heterojunction is fabricated via a room-temperature co-precipitation method. • The Z-scheme mechanism preserves strong redox potentials, generating abundant ·OH, ·O 2 - , and h + . • Bi 4 O 5 I 2 /BiOBr achieves 85.8% MB degradation in 150 min, with a rate constant 16.06 times that of BiOBr. • The composite exhibits excellent stability and reusability over four consecutive degradation cycles. • This work provides a green, scalable strategy for designing high-performance bismuth-based photocatalysts : Bismuth and bismuth-rich oxyiodides, such as BiOX and Bi 4 O 5 I 2 , are promising visible-light photocatalysts but suffer from rapid photogenerated carrier recombination. Here, we construct a novel Bi 4 O 5 I 2 /BiOBr heterojunction via a facile room-temperature co-precipitation method that creates a tight heterointerface between two layered bismuth-based semiconductors. This yields intimate contact confirmed by HRTEM and XPS. The composite also shows enhanced visible light absorption (UV–Vis DRS) and markedly suppressed photoluminescence, indicating efficient charge separation, further supported by higher photocurrent and smaller EIS arc radius. More importantly, the work proposes a Z-scheme charge transfer mechanism rather than a conventional type-II junction. Based on band-edge calculations (Mott–Schottky) and radical trapping experiments, the composite preserves the strong reduction ability of electrons in Bi 4 O 5 I 2 and the strong oxidation ability of holes in BiOBr, while the less energetic charge carriers recombine. This mechanism is a key conceptual advance because it overcomes the redox-capacity loss typical of type-II systems and generates highly reactive species (h + , ·OH, and ·O 2 - ), as verified by scavenger tests. The k value of Bi 4 O 5 I 2 /BiOBr-3 (0.01333 min -1 ) is 7.98 and 16.06 times higher than those of Bi 4 O 5 I 2 (0.00167 min -1 ) and BiOBr (0.00083 min -1 ), respectively. The composite also demonstrates excellent stability over four consecutive cycles. This work offers a simple, energy-efficient strategy for constructing high-performance bismuth-based Z-scheme heterojunctions, providing a viable route for wastewater remediation and advancing the rational design of photocatalysts with synergistic redox capability.
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DOI
高影响因子
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