NEW JOURNAL OF CHEMISTRY
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2024
·Vol. 48
·期 27
·12306-12314
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IF 2.7
Ran Gao,Wensong Lin,Yeheng Zhang,Xin Mai,Junnan Chen,Huanxia Lin
Bi5O7I doped with Zn2+ (Zn2+/Bi5O7I) was prepared using a precipitation calcination method. Its photocatalytic activity was improved by adjusting the band gap of Bi5O7I, and its photocatalytic performance was evaluated by degrading RhB. The experimental results showed that Zn2+/Bi5O7I-8 had the highest photodegradation efficiency, and the degradation rate for RhB after exposure to light for 30 minutes was 91% and reached 100% in 60 minutes. The degradation rate constant k of Zn2+/Bi5O7I-8 reached 0.10813 min−1, which is 13 times more than that of Bi5O7I. As a result of Zn2+ being added into Bi5O7I, the band gap of Zn2+/Bi5O7I became narrower than that of Bi5O7I, and the photogenerated electrons and holes were successfully prevented from recombining; therefore, the photocatalytic activity of Zn2+/Bi5O7I was higher than that of Bi5O7I. After four rounds of photocatalytic experiments, the photocatalytic efficiency of Zn2+/Bi5O7I-8 remained high. The composition and microstructure of the materials were characterized using XRD, FTIR, XPS, SEM, and TEM. The optical properties and degradation mechanism of the material were investigated using DRS, PL, photocurrent response, and active substance capture experiments. A suggested mechanism for the photocatalytic degradation of RhB is presented.
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 MATERIALS RESEARCH
·
2025
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IF 2.9
He Yong,Lin Wensong,Gao Ran,Zhang Yeheng,Lin Huanxia
Bi 5 O 7 I was considered as a promising photocatalyst due to its unique structure. However, the recombination rate of electron–hole pairs generated by Bi 5 O 7 I is too fast, making it impossible for practical applications. In this study, Bi 5 O 7 I catalysts deposited with various amount of silver were manufactured and their photocatalytic efficiency for rhodamine B (RhB) was measured. It was found that Bi 5 O 7 I with a silver deposition of 15% (named as Bi 5 O 7 I/Ag-15) exhibits the highest catalytic performance, with a degradation rate of 97.34% for RhB after illumination for 90 min. The cyclic test results confirmed that Bi 5 O 7 I/Ag-15 still maintained high photocatalytic activity after six cycles of degradation. In addition, Bi 5 O 7 I/Ag-15 also exhibits an excellent photocatalytic performance in acidic or alkaline environments, indicating its potential for practical applications. A reasonable degradation mechanism for RhB photocatalysis was then proposed. Graphical abstract
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 ALLOYS AND COMPOUNDS
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2021
·
IF 5.316
Wendi Huang,Xinyan Xiao,Mingli Lu,Yu Xiao
A novel BiOCl/Bi 5 O 7 I (BOC-BOI) heterojunction was prepared by growing ultrathin 2D BiOCl nanosheets in situ on the surface of 3D Bi 5 O 7 I microspheres . The 2D/3D heterostructure of BOC-BOI composites inhibited the agglomeration of BiOCl nanosheets, and benefited the multiple reflection and refraction of light, which greatly enhanced the absorption and utilization of light. The 50-BOC-BOI composite showed 97.7% degradation efficiency of rhodamine B (RhB) after 70 min Xe light irradiation. And its apparent degradation rate constant ( k ) was 0.0377 min −1 , being 4.9 and 15.1 times than that of pristine BiOCl (0.0077 min −1 ) and Bi 5 O 7 I (0.0025 min −1 ), respectively. The enhanced photocatalytic activity of BOC-BOI composites was attributed to stronger light capture ability, more abundant active sites and higher charge carrier separation efficiency, confirmed by UV-Vis DRS, SEM, TEM, BET, Zeta potential and electrochemical characterizations. The free radical capture experiments showed that the main active species in this system were holes (h + ) and superoxide free radicals (·O 2 − ). Combining the results of UV-Vis DRS and Mott-Schottky test, a reasonable type II heterojunction mechanism was proposed.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Zhijia Zhu,Chenmiao Zhu,Ruiying Yang,Lingfeng Yan,Chunyan Hu,Baojiang Liu
Exploring the efficient and sustainable photocatalysts is the key pot for the improvement of photocatalytic efficiency. In this work, a series of Bi 5 O 7 I/BiOIO 3 composite materials were successfully prepared via a mild hydrothermal method to make layered BiOIO 3 nanosheets uniformly grown in-situ on the smooth surface of Bi 5 O 7 I microrods. The electronic channel at the interface constructed by the in-situ growth could drastically shorten the distance of electron transmission to accelerate the electron transfer. The formation of Bi 5 O 7 I/BiOIO 3 heterojunction was determined via the characterization of the composition and photochemical analysis. Benefited from this structure, the Bi 5 O 7 I/BiOIO 3 with the mass ratio of 1:1 exhibited over 90% efficiency in degradation of 4 different antibiotics after irradiation for 120 min. After that, 5 cycles proved that Bi 5 O 7 I/BiOIO 3 has excellent stability and reusability, which can guarantee the application in the practical process. Finally, the electron migration path and photocatalytic mechanism of the catalyst are inferred base on the capture experiment and ESR test, which proposed that h + and ·O 2 - were the primary active species in the photocatalytic process and confirmed the formation of Z-type heterojunctions between Bi 5 O 7 I and BiOIO 3 . The heterostructure with well-matched band structure enhances the separation and migration of photogenerated charges, which contributes to improve the photocatalytic activity. The design of novel photocatalyst with high efficiency and low-toxicity provides a new approach to achieve full utilization of solar energy and efficient environmental purification.
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 HAZARDOUS MATERIALS
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2024
·
IF 12.2
Jia Huang,Yunjie Zou,Lan Ling
Perfluorooctanoic acid (PFOA) is detected widely in surface and groundwater globally. Its removal poses a significant challenge due to its high chemical stability. This study demonstrates efficient PFOA degradation using poly-triazine-imides-tailored defective Bi 5 O 7 I (PTI/BB). Under 300 W Xe irradiation, 1 µg·L −1 PFOA could be degraded to 9.86 ng·L −1 after 3 h in the presence of 0.5 g·L −1 25 % PTI/BB. The mechanism investigation reveals that the oxygen vacancy (OV) in partially reduced Bi/Bi 5 O 7 I (BB) generates impurity states, enhancing the light-harvesting capacity. Furthermore, forming a type Ⅱ heterojunction between conjugated PTI and BB facilitates the efficient separation of photogenerated carriers. The resulting photogenerated electrons (reduction) and holes (oxidation) drive hydrogenation reduction and oxidative decarboxylation of PFOA, respectively. This synergistic effect consequently achieves significant defluorination of PFOA. The proposed PFOA degradation pathway via the PTI/BB catalyst offers new insights into the catalyst design for photocatalytic degradation of per- and polyfluoroalkyl substances (PFAS).
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
ENERGY & FUELS
·
2020
·
IF 3.421
Min Zhou,Jiang Wu,Huaning Wang,Dayong Guan,Xinfeng Dong,Jianmin Wang,Tao Jia,Qizhen Liu
Constructing a heterojunction and designing a band gap are effective methods to promote the efficiency of a photocatalyst and solar energy utilization. In this work, g-C3N4/Yb3+-Bi5O7I nanostructured photocatalysts were successfully prepared using a hydrothermal method with glycol as a solvent and a calcination method, and the performance of the photocatalysts containing different amounts of g-C3N4 was studied. A series of characterizations confirmed the successful complexation of g-C3N4 nanosheets with Bi5O7I, and Yb3+ was successfully doped into the lattice of Bi5O7I. g-C3N4 and Yb3+ have a synergistic effect on expanding the photoresponse range of CYB(g-C3N4/Yb3+-Bi5O7I) composite photocatalysts. As expected, CYB samples have wonderful photocatalytic performance and stability in the removal of Hg0, among which CYB-20 has the highest removal efficiency, reaching 79%. Yb3+ with upconversion characteristics can convert infrared light into visible light and form new energy levels in Bi5O7I. g-C3N4 and Bi5O7I form a Z-scheme heterojunction to improve the photocatalytic performance of Bi5O7I. Besides, the electron and hole transmission paths and the catalytic mechanism of the photocatalysts are also proposed. This work offers a new approach to construct a photocatalyst system for pollutant emission control with a wide wavelength range of sunlight, which may be helpful to develop environmentally benign functional materials.
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
ACS Applied Nano Materials
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2022
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IF 6.14
Jingchao Wang,Siyi Li,Kunlong Yang,Tianyong Zhang,Shuang Jiang,Xianggao Li,Bin Li
Coupling heterojunction is an effective and feasible approach to suppressing the electron–hole recombination of a photocatalyst. However, the heterojunction performance is limited by poor interface contact between two semiconductors. Therefore, an in situ partial conversion procedure was proposed to fabricate the flower-spherical BiOI/Bi5O7I (BBOI) heterojunction using bacitracin as a template. The introduction of bacitracin can regulate the assembly of nanosheets into a flower-spherical structure, which caused the BBOI photocatalysts to have larger specific surface areas than BiOI or Bi5O7I. In particular, the dosage of bacitracin can control the thermal conversion of BiOI to Bi5O7I. The in situ partial conversion of BiOI caused the formation of an intimate S-scheme heterojunction interface between BiOI and Bi5O7I, which efficiently inhibited the combination of photogenerated carriers. Upon visible-light irradiation, BBOI-3 exhibited the highest catalytic ability for the simultaneous reduction of Cr(VI) (100%) and oxidative degradation of tetracycline hydrochloride (TH) (80.0%). This work provides an opinion to construct the high-performance 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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2021
·
IF 19.503
Qi Li,Yi-lei Li,Bo Li,Ying-juan Hao,Xiao-jing Wang,Rui-hong Liu,Yuan Ling,Xinying Liu,Fa-tang Li
In layered Bi-O-X materials, {001} and {110} facets are regarded to be highly active. However, dominant facets in bismuth-rich materials are rarely studied so far. In this paper, the role of main {314} facet of Bi 5 O 7 I is investigated for the first time. Bi 5 O 7 I samples with adjustable {314} and {008} facet ratios are synthesized using ionic liquid self-combustion method. The inducing growth role of tetramethylammonium iodide for {314} main facet is revealed. Photocatalytic experiments indicate that the activity of Bi 5 O 7 I material with {314}/{008} facet ratio of 4.32 are lower than those of Bi 5 O 7 I with facet ratio of 5.23 and 4.56, implying the increase of {008} facet proportion could not effectively improve the redox performance. Meanwhile, the controllable oxygen vacancy concentration can be realized by constructing reduction atmosphere. Photoelectrochemical test results show that the synergistic effect of facet ratio and the oxygen vacancies lead to the improvement of charge carriers.
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 MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 6
·4822-4835
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IF 2.22
Zhou Nan,Tan Junjie,Li Xi,Wang Lu,Jin Chenglong,Chen Ming,Yu Zhengsong,Liang Yani,Qiu Zhidong,Li Wenlong,Dong Yulin,Xie Zhizhong,Lin Yawei,Qu Deyu,Zhang Chaocan
A series of Bi 5 O 7 I/MIL-53(Fe) (BOI/MIL- w ) composites were successfully prepared by a facile in-situ solvothermal approach. The matched energy bands enabled Bi 5 O 7 I and MIL-53(Fe) to form a Z-scheme heterojunction which resulted in an efficient separation of the photo-induced electron–hole pairs. The photocatalytic activity of BOI/MIL- w was evaluated by the degradation of Rhodamine B (RhB) in water under the visible light irradiation. Compared with Bi 5 O 7 I, photocatalytic performances of BOI/MIL- w notably boosted. When the content of added MIL-53(Fe) was 3 wt%, BOI/MIL-3 presented the highest activity with a degradation efficiency of 99.7% only after 60 min of irradiation. The reaction rate constant k could reach 0.0992 min −1 which was nearly 12.6 times as high as that of Bi 5 O 7 I. Moreover, BOI/MIL- w had a good stability and reusability, which could ensure its practical application. Trapping experiments confirmed that h + and ·O 2 − were the dominant active species during the photocatalytic process, and further demonstrated the formation of the Z-scheme heterojunction facilitated the photocatalytic performance of BOI/MIL- w .
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
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
·
IF 16.683
Chun-Shuai Cao,Jingzhen Wang,Xiaoyong Yu,Yinqing Zhang,Lingyan Zhu
Bisphenol analogues have been widely used and displayed adverse effects on human beings. Although many photocatalysts displayed remarkable performance in degrading bisphenol A (BPA) or bisphenol F (BPF), it is not clear if they may also efficiently decompose other bisphenol analogues. In this study, Bi 5 O 7 I with satisfactory photocatalytic activity was doped with metal-organic framework (UiO-67) to build up Bi 5 O 7 I/UiO-67 heterojunctions. The heterojunction enhanced the charge mobility and separation of the electron-hole pairs, which was conducive for improving the photocatalytic activity. Consequently, 4:1-Bi 5 O 7 I/UiO-67 realized highly effective degradation of seven bisphenol analogues in one hour. Density functional theory (DFT) calculations uncovered that the reaction rate constant k displayed a positive correlation with the Hirshfeld charge q (N) of tertiary butyl carbon attached with different substituent groups. This provides a prospective heterojunction catalyst to degrade a group of pollutants with similar structures, and sheds light on the structural relationship of degradation efficiency.
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
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2022
·
IF 3.754
Cailian Xia,Ruixin Lu,Qiaofeng Han
Bismuth-rich oxyiodides are promising photocatalysts owing to their unique layered structures, tunable band potentials and excellent redox ability. It is significant to explore a facile and energy-saving method to prepare Bi x O y I z -based heterojunction photocatalysts with enhanced photocatalytic performance. In this work, Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction was prepared at room temperature in the existence of thiourea (TU). The addition of TU not only reduced pH value to 6 for the generation of Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction from pH 11 in water, but also improved the photocatalytic performance. The as-prepared Bi 4 O 5 I 2 /Bi 5 O 7 I (pH 6) heterojunction exhibited superior photocatalytic activity for the degradation of tetracycline (TC) and malachite green (MG) with degradation efficiency of 89.8% and 98.2% within 120 min of visible light illumination, respectively. And the photocatalytic performance was better than those of Bi 4 O 5 I 2 /BiOI heterojunction obtained in the absence of NaOH (79.2%; 85.8%), pure BiOI synthesized without the addition of TU (pH 6) (81%; 81.4%), and Bi 4 O 5 I 2 /Bi 5 O 7 I heterojunction produced at pH 11 in water (38.7%; 85.4%). The enhanced photocatalytic activity of Bi 4 O 5 I 2 /Bi 5 O 7 I (pH 6) heterojunction could be attributed to smaller particles with higher specific surface area and high exposure ratio of (001) facet of Bi 5 O 7 I and (402) facet of Bi 4 O 5 I 2 .
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
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Jingzhen Wang,Chunshuai Cao,Yuanyuan Wang,Yingnan Wang,Binbin Sun,Lingyan Zhu
The strong persistence, wide presence and potential toxicities of perfluorooctanoic acid (PFOA) in aquatic environment makes it a challenge to develop advanced technologies to eliminate it from water. In this study, novel BiOI@Bi 5 O 7 I p-n heterojunction photocatalysts were facilely prepared by calcinating BiOI at 350 °C < T < 410 °C. Under simulated solar light irradiation, the degradation rate constant ( k = 0.247 h −1 ) of PFOA by the BiOI@Bi 5 O 7 I heterojunction prepared at 390 °C (T-390) was four times of that by pristine BiOI ( k = 0.061 h −1 ) and 1.2 times of that by Bi 5 O 7 I (prepared at 410 °C, k = 0.206 h −1 ). T-390 also exhibited excellent mineralization efficiency by removing about 60% of total organic carbon in 6 h of irradiation. The significantly enhanced photocatalytic activity of BiOI@Bi 5 O 7 I composite was mainly attributed by the unique band gap structure of the p-n heterojunction, which enhanced the visible-light absorbance and accelerated the separation of photogenerated charge carriers. The generated intermediate products were analyzed by ultra-performance liquid chromatography-mass spectrometry, and the results indicated that PFOA was decomposed by stepwise losing CF 2 units. The BiOI@Bi 5 O 7 I heterojunction also possessed very good durability and reusability, displaying a great potential in PFOA containing water treatment.
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
危险品化学品经营许可证（带存储）