Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Jinghao Hua,Sheng Feng,Changchang Ma,Haitao Huang,Kai Wei,Xiaojun Dai,Kaidi Wu,Haihong Wang,Zhaowei Bian
In this study, a novel 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst was prepared by combining NiFe-LDH with Bi 5 O 7 Br through self-assembly. Under simulated solar irradiation, compared with pure NiFe-LDH and Bi 5 O 7 Br, the 2D/2D Z-scheme Bi 5 O 7 Br/NiFe-LDH photocatalyst revealed a significant improvement in the efficiency of photocatalytic reduction of CO 2 . Z-scheme heterojunction promotes the separation of photo generated charge carriers and 2D/2D structure is conducive to exposing more active site and enhancing the migration rate of interface carriers. The photocatalytic activity experiment revealed that the CH 4 production efficiency of the Bi 5 O 7 Br/NiFe-LDH (37.77 μmol/g/h) after 8 h of light exposure was 2 times and 10 times that of Bi 5 O 7 Br (22.41 μmol/g/h) and NiFe-LDH (3.84 μmol/g/h), respectively. The successful formation of Z-scheme heterojunction was determined through band analysis and related characterization. The advantage of Z-scheme heterojunction is that it has high electron mobility and low resistivity. This work launches a feasible design strategy of special structure photocatalysts to enhance the photocatalytic activity for the CO 2 reduction.
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
RSC Advances
·
2016
·Vol. 6
·期 34
·28263-28269
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IF 3.289
Xiumin Ma,Quantong Jiang,Weimin Guo,Meng Zheng,Weichen Xu,Fubin Ma,Baorong Hou
In this study, a sandwich-structured C3N4/Au/CdZnS photocatalyst with Au nanoparticles sandwiched between C3N4 and CdZnS was fabricated. The results showed that there was a 6.3 mmol g−1 increase of hydrogen production for C3N4/Au/CdZnS photocatalyst compared to C3N4/CdZnS in 4 h. The photoinduced I–t curve, electrochemical impedance spectrum (EIS), photogenerated electron lifetime and photoluminescence spectra showed that the photocatalytic ability of the composite was enhanced by anchoring Au as the electron transfer mediator between C3N4 and CdZnS through the Z-scheme charge-carrier transfer mechanism. Au functioned as an electron transition mediator, which could induce a combination between photogenerated electrons and holes in the CdZnS and C3N4, respectively. These photogenerated holes of CdZnS can be involved in the S2−/SO32− oxidation process and the electrons from the C3N4 surface might be involved in the water to hydrogen reduction reaction, thus enhancing the photocatalysis performance of C3N4/Au/CdZnS photocatalyst.
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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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Dandan Liu,Jinghao Hua,Weijie Zhang,Kai Wei,Shushan Song,Qianyu Wang,Ziheng Song,Huarui Han,Changchang Ma,Sheng Feng
Building efficient catalysts is an urgent issue in the field of photocatalytic CO 2 reduction, and Z-scheme heterojunction structures can availably suppress the recombination of photo generated carriers and improve photocatalytic performance. This study successfully prepared a new type of Bi 4 O 5 Br 2 /Bi-MOF composite photocatalyst through self-assembly method. After 5 h of simulated sunlight exposure, the optimized sample 50-Bi 4 O 5 Br 2 /Bi-MOF photocatalytic reduction of CO 2 to CO efficiency (23.78 μmol·g −1 ·h −1 ) was 5.09 times higher than pure Bi 4 O 5 Br 2 , and the CH 4 yield (5.39 μmol·g −1 ·h −1 ) was 2.52 times that of pure Bi-MOF. In addition, in the cyclic experiment, the catalyst had high stability and reusability. The Z-scheme charge transfer mechanism was confirmed through band structure analysis, Electron spin resonance (ESR), Ultraviolet photoelectron spectroscopy (UPS) and other related characterizations. This work provided an important strategy for designing efficient Z-scheme heterojunction 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
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2022
·Vol. 33
·期 20
·16077-16098
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IF 2.779
Chen Keke,Feng Hange,Li Lingwei,Luo Menghao,Xue Shaolin,Sang Jingxin
The excellent photoresponse of semiconductors enables them as a promising photocatalyst for photocatalytic degradation of organic pollutants and antibiotics, but their practical applications are limited by photogenerated carrier recombination, instability, and fixed energy band positions. Herein, we designed and synthesized a dual Z-scheme flower-like spherical Ag 3 PO 4 /MoS 2 /g-C 3 N 4 (AMN) photocatalyst loaded with different mass of g-C 3 N 4 (3, 5 and 7 mg). Under visible light irradiation, MoS 2 enhanced the light absorption range of AMN composite. The holes concentrated in the valence band of Ag 3 PO 4 provide strong oxidation capacity, and the electrons retained in conduction band of g-C 3 N 4 provide strong reduction ability in the photocatalytic system. It is helpful to improve the separation efficiency of photogenerated carriers and enhance the photocatalytic activity of AMN composite. The AMN photocatalyst loaded with 5 mg g-C 3 N 4 (AMN-5) has the optimal photocatalytic activity. The photocatalytic degradation efficiency of the photocatalyst for methylene blue (MB) within 24 min is 3.98, 1.85, and 1.17 times that of g-C 3 N 4 , Ag 3 PO 4 , and Ag 3 PO 4 /MoS 2 , respectively. After three cycles, the degradation efficiency of AMN-5 for MB decreased from 99.44% to 90%, about 3.79 times of Ag 3 PO 4 (23.77%). In addition, the optimal AMN-5 photocatalyst also has excellent photocatalytic degradation efficiency for Rhodamine B (RhB) and tetracycline (TC). This design and concept provide a promising insight for the photocatalytic degradation of pollutants.
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 SURFACE SCIENCE
·
2020
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IF 6.182
Min Zhang,Jiacheng Yao,Muhammad Arif,Bo Qiu,Hongfei Yin,Xiaoheng Liu,Shen-ming Chen
The electronic transmission mode can effectively influence the photogenerated electron-hole separation efficiency, which further influence the photocatalytic hydrogen production performance. Herein, we synthesized a CeO 2 /ZnIn 2 S 4 composite photocatalyst having a 0D/2D heterojunction by facile solvothermal and room temperature precipitation methods. The successful construction of the heterojunction was demonstrated by XRD and XPS. Meanwhile, the interesting findings shows that the 0D “chess” CeO 2 compounded on the 2D “checkerboard” ZnIn 2 S 4 in SEM and TEM. The ESR test of O 2 − and OH demonstrates the photocatalytic mechanism of Z-scheme electron transport in the catalyst. The highest hydrogen production rate of the catalyst reaches 847.42 μmol·g −1 ·h −1 . This work provides a simple and effective strategy to achieve a rationally design photocatalyst for efficient, stable and cost-effective solar hydrogen production applications.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
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2025
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IF 3.5
Zheng Nan,Gou Jialin,Lan Meng,Dong Xiaoli,Liu Yujun,Du Jinpeng
Photocatalytic technology has received widespread attention as an effective means of treating organic pollutants in wastewater, but the development of effective and sustainable photocatalysts remains a serious challenge. In this study, a novel Mn 0.2 Cd 0.8 S (MCS)/Bi 4 O 5 Br 2 (BOB) heterojunction photocatalyst was successfully prepared by a two-step solvothermal method. The photocatalytic activity of the MCS/BOB heterojunction photocatalyst for degrading Rhodamine B (RhB) is significantly enhanced relative to Mn 0.2 Cd 0.8 S and Bi 4 O 5 Br 2 . When the molar content of Mn 0.2 Cd 0.8 S was 15% of Bi 4 O 5 Br 2 , the prepared 15% MCS/BOB had the best photocatalytic performance toward RhB with the degradation rate of 91.7% under 60 min of visible light irradiation. The apparent rate constant of 15% MCS/BOB is 10 and 7 times higher than that of Mn 0.2 Cd 0.8 S and Bi 4 O 5 Br 2 , respectively. The excellent photocatalytic performance is associated with the increased specific surface area, extended light absorption range, and proper construction of Z-scheme heterojunction that facilitate effective charge separation and excellent redox capacity. In addition, the heterojunction photocatalyst shows remarkable photocatalytic stability. This study constructs a novel and effective Z-scheme heterojunction photocatalyst and promotes the exploration of photocatalyst in the purification of organic wastewater.
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
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Yulong Xiang,Xinbin Ji,Xiaoli Dong,Yu Wang,Nan Zheng,Chundong Liu,Menglin Wang,Chumin Yan
Photoreduction of toxic Cr(VI) in wastewater to less toxic Cr(III) presents an effective approach to address the environmental issues. Nevertheless, the photocatalytic performance of these photocatalysts is severely constrained by their narrow light absorption range and the rapid recombination of photo-generated electrons and holes. Herein, DUT-67/Fe 2 O 3 heterojunction photocatalysts were prepared by a simple mechanical grinding method. The formation of DUT-67/Fe 2 O 3 heterostructures not only increased the specific surface area and light absorption range, but also improved the separation of photogenerated charge carriers. Compared to the pristine DUT-67, DUT-67/Fe 2 O 3 exhibited significantly improved photocatalytic performance in the reduction of Cr(VI), achieving a reduction efficiency of up to 94 % within 40 min. Active species trapping experiments identified that electrons served as the primary species in the photocatalytic process. Coupled with electron spin resonance and density functional theory (DFT) calculations, a comprehensive mechanism for the photocatalytic reduction of Cr(VI) by DUT-67/Fe 2 O 3 Z-scheme heterojunction was proposed. This work offers new insights into the underlying mechanisms involving in the interfacial charge transfer and Cr(VI) photoreduction processes.
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
LANGMUIR
·
2025
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IF 3.9
Guang Lu,Lunqiu Zhang,Jiling Liang,Wei Li,Zheng Li,Xuejun Zou,Xiaodong Zhang
Herein, first, MIL-125 samples were synthesized via a hydrothermal method. Then, Ag species were doping on the surface of MIL-125 samples via the photolysis of silver nitrate. Finally, the Z-scheme MIL-125/Ag/BiOBr composite was synthesized via a directed liquid assembly method. The structure, morphology, and optical properties of the prepared samples were investigated via X-ray diffraction, scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive X-ray spectroscopic mapping, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, N2 adsorption–desorption analysis, ultraviolet–visible spectroscopy, photoluminescence spectroscopy, surface photovoltage analysis, transient photocurrent response analysis, electrochemical impedance spectroscopy, and electron spin resonance analysis. Photocatalytic experiments indicated that the photocatalytic Cr6+ reduction efficiency of MIL-125/Ag/BiOBr heterojunctions was 85.7% at pH = 6, which was approximately 5.5 and 2.2 times higher than that using BiOBr and MIL-125 alone, respectively. This performance was attributed to the intimate interfacial contact between MIL-125 and BiOBr and the doping of Ag species, which increased the transfer and separation of photogenerated carriers and inhibited the recombination of electrons and holes. Furthermore, the possible photocatalytic Cr6+ reduction mechanism of the Z-scheme MIL-125/Ag/BiOBr photocatalyst was proposed.
研究领域:
材料科学
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环境科学
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DOI
PubMed
高影响因子
ACS Catalysis
·
2018
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IF 11.384
Chunwei Dong,Siyu Lu,Shiyu Yao,Rui Ge,Zidong Wang,Ze Wang,Pengfei An,Yi Liu,Bai Yang,Hao Zhang
Recently, ultrathin 2D photocatalysts have attracted people’s attention due to their performances in the area of solar energy conversion. However, the synthesis of ultrathin 2D photocatalysts with a nonlayered crystal structure is still full of challenges. Herein, ultrathin 2D BiVO4 nanosheets (NSs) with monoclinic crystal structure are synthesized through a convenient colloidal two-phase method. The as-prepared BiVO4 NSs possess a thickness of less than 3 nm but a diameter larger than 1.2 μm. Furthermore, the presence of HNO3 facilitates the growth of BiVO4 NSs with nearly naked surfaces, largely exposed {010} planes, and widely distributed oxygen vacancies (VO) inside the crystalline structure, which are of great benefit to their photocatalytic activity under visible light irradiation. As a result, our ultrathin 2D BiVO4 NSs exhibit an impressive photocatalytic performance for water oxidation. The O2 evolution rate is 107.4 μmol h–1, and the apparent quantum yield (AQY) is as high as 26.1% (420 nm). Furthermore, by employing our ultrathin 2D BiVO4 NSs as the O2-evolving photocatalyst, Ru-SrTiO3:Rh and Fe3+/Fe2+ as the H2-evolving photocatalyst, and the redox mediator, respectively, a Z-scheme overall water splitting system is successfully constructed. Under visible light irradiation, our Z-scheme photocatalytic system presents high H2 and O2 evolution rates (16.7 and 8.0 μmol h–1) with an AQY of 1.88% (420 nm) and good photocatalytic stability.
研究领域:
材料科学
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光催化技术
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能源转换
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产品关联
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 18
·6271-6280
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IF 6.119
Jiaqi Dong,Jianqiang Hu,Anyu Liu,Jiale He,Qingling Huang,Yanru Zeng,Wenjing Gao,Zhen Yang,Yongcai Zhang,Yong Zhou,Zhigang Zou
Direct Z-scheme MgIn2S4/Bi2WO6 hierarchical heterostructures were simply fabricated via immobilising MgIn2S4 nanoflakes onto the surface of Bi2WO6 hierarchical nanosheet-like structures towards photocatalytic reduction of Cr(VI). The analyses of the energy band structure, UPS tests and DMPO-ESR spin-trap experiments confirm that the intimate MgIn2S4/Bi2WO6 heterointerface allows an efficient Z-scheme interfacial charge migration route between MgIn2S4 and Bi2WO6, leading to higher redox ability of photoexcited carriers, and thus favours the separation of photoexcited carriers, proved by the results of PL spectroscopy, photoluminescence decay traces, transient photocurrent densities and EIS. In addition, the MgIn2S4/Bi2WO6 heterostructures also exhibit obviously enhanced ultraviolet-visible-light absorption according to UV-vis DRS analysis, and can generate more electron–hole pairs under UV-visible light illumination, effectively improving the photocatalytic activity. Therefore, because of their synergistic effects, all the MgIn2S4/Bi2WO6 hierarchical heterostructures show distinctly improved photoreduction activities for Cr(VI), compared with pure Bi2WO6. The optimal hybrid (MIS/BWO-0.35) displays nearly 100% Cr(VI) reduction into Cr(III) after 40 min of simulated sunlight illumination, which is better than the majority of the reported Bi2WO6 and other semiconductor photocatalysts before. Its reaction rate constant for the photoreduction of Cr(VI) (0.1063 min−1) is about 4.5 times higher than that of the pristine Bi2WO6 (0.0237 min−1). This work provides a valid approach for developing efficient Z-scheme photocatalytic materials in removing Cr(VI).
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
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Jinghang Chen,Yaqiang Wu,Zihao Cui,Qianqian Zhang,Zeyan Wang,Zhaoke Zheng,Hefeng Cheng,Yuanyuan Liu,Xin Li,Shukui Shi,Baibiao Huang,Peng Wang
The carbonyl compounds synthesized from benzyl alcohol by selective photocatalysis have a wide range of applications in the chemical, pharmaceutical and food industries, while the fine chemical synthesis remains challenged by inefficient carrier separation and inadequate redox potential control in conventional semiconductor systems. The stability and eco-friendly attribute of lead-free bismuth halide perovskites emerge as promising photocatalysts for practical applications. Herein, we design and synthesize a Z-scheme heterojunction between Cs 3 Bi 2 Br 9 and Bi 2 WO 6 by an anti-solvent method. The optimized Cs 3 Bi 2 Br 9 /Bi 2 WO 6 composite demonstrates enhanced photocatalytic performance for benzyl alcohol oxidation, achieving 95 % conversion efficiency with 99 % benzaldehyde selectivity under AM 1.5G irradiation. Systematic in situ characterizations, including electron spin resonance, X-ray photoelectron spectroscopy and diffuse reflectance infrared Fourier-transform spectroscopy, evidence the Z-scheme charge transfer mechanism in Cs 3 Bi 2 Br 9 /Bi 2 WO 6 , track key intermediates during the oxidation pathway, and mechanistically identify superoxide radicals (• O 2 - ) as the predominant active species. This study not only advances the understanding of photocatalytic mechanisms in Z-scheme organic transformations but also provides a foundational framework for the design of efficient photocatalytic systems.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2020
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IF 16.683
Shu Xu,Shuaiqi Gong,Hua Jiang,Penghui Shi,Jinchen Fan,QunJie Xu,YuLin Min
In this paper, we have designed the composite material of black phosphorus/tungsten nitride (BP/WN) with near-infrared light (NIR light) response as a noble-metal free photocatalyst for the first time. Modification of bulk BP by ball milling can control the band gap of the composite material to achieve efficient photocatalytic hydrogen evolution in the near-infrared region. At wider than 420 nm, and with illumination wider than 700 nm, a certain amount of hydrogen can be produced without any hole quencher. The rate of photocatalytic hydrogen evolution from pure water reaches 10.77 μmolg −1 h −1 under NIR light without any cocatalyst. The presence of a Z-type heterojunction effectively separates photogenerated carriers and prolongs the lifetime of photogenerated carriers, thereby enhancing the photocatalytic performance. The results indicate that BP/WN photocatalysts can provide a new approach to artificial photosynthesis and renewable energy conversion.
研究领域:
材料科学
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能源化学
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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）