Crystals
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2023
·Vol. 13
·期 11
·1531
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IF 2.7
Li Wang,Junbo Wang,Yanfei Fei,Heping Cheng,Hua Pan,Chunfeng Wu
Novel Ag3PO4/Bi2WO6catalysts with enhanced visible-light performance were synthesized using a hydrothermal method and characterized to investigate their morphology, microscopic structure, and binding energies. Photoluminescence spectrum (PL) and electrochemical impedance spectroscopy (EIS) data demonstrate that the formed Ag3PO4/Bi2WO6heterojunction effectively promotes hole (h+)–electron (e−) separation and transfer efficiency, resulting in the enhancement of photocatalytic activity. Ag3PO4/Bi2WO6displays higher photocatalytic activity than pure Bi2WO6or Ag3PO4alone. Photogenerated holes (h+), ·O2−, and ·OH were found to be the main active species for the degradation of malachite green (MG), methylene blue (MB), and Rhodamine B (RhB). The DFT calculation explains the photostability of Ag3PO4/Bi2WO6from the perspective of electronic structure. The bandgap of Ag3PO4/Bi2WO6between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is 1.41 eV, compared with that of Ag3PO4at 0.91 eV and Bi2WO6at 2.59 eV. Ag–O–Bi hybridization and the wide HOMO–LUMO bandgap lead to difficulty in electron transfer. As a consequence, Ag+is difficult to obtain electrons and difficult to convert into Ag0, which makes the catalyst stable.Keywords:Ag3PO4;Bi2WO6;heterojunction;photocatalyst;visible-light-driven
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
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Mei Cai,Bin Du,Anze Shui,Chao He
The photodegradation of pollutants is a significant and friendly technology to protect the environment. The fabrication of hierarchical heterojunction is the efficient method to improve the photocatalytic performance. Herein, the hierarchical type-II BiOBr@ZnIn 2 S 4 heterojunction is fabricated successfully via a simple chemistry method. The optimal sample BS170 (the volume of 170 mL ethylene glycol) exhibits the higher photodegradation under the visible light and presents 2.3 times higher than that of pure BiOBr for degradation of MO and the mass of BS170 is the half of BiOBr could achieve the same photocatalytic effect as BiOBr for the photodegradation of RhB. The results indicate the fabric of heterojunction could enhance the absorption capacity of visible light and separation efficiency of photoinduced electron-hole pairs to increase the photodegradation. Therefore, this work provides the novel strategy for fabricating the hierarchical type-II heterojunction photocatalyst for the degradation of dyes.
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
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2017
·Vol. 2017
·期 40
·4797-4802
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IF 2.444
Yulan Peng,Lingzhi Wang,Yongdi Liu,Haijun Chen,Juying Lei,Jinlong Zhang
Graphical A CoP-decorated g-C 3 N 4 composite catalyst was developed for highly efficient and stable photocatalytic production of H 2 O 2 under visible-light irradiation. The CoP nanoparticles act as a noble metal free cocatalyst for g-C 3 N 4 to enhance the visible-light absorption and promote the separation of photogenerated charge carriers. A composite catalyst combining CoP with g-C 3 N 4 was explored for the photocatalytic production of H 2 O 2 under visible-light irradiation. The composite catalyst was fabricated by growth of CoP nanoparticles on the surface of g-C 3 N 4 . The CoP nanoparticles were well dispersed on the surface of g-C 3 N 4 and could interact with g-C 3 N 4 to improve charge separation and electron transfer. The composite catalyst showed superior catalytic activity compared with pure CoP or g-C 3 N 4 under visible-light irradiation. The optimal catalyst with 1.76 wt.-% CoP loading exhibited the best photocatalytic efficiency with an H 2 O 2 production of 140 µ m in 2 h, which is about 4.6 and 23.3 times those of pure g-C 3 N 4 and pure CoP, respectively. A possible mechanism for the visible-light-driven photocatalytic production of H 2 O 2 is proposed. The composite catalyst exhibited stable performance without obvious loss of catalytic activity after seven successive runs, and thus has good application prospects in sustainable H 2 O 2 production.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Xu Yang,Zhaoxia Zhang,Xiaoyang Wang,Guanghua Wang,Xinlong Tian,Zhifu Wu
Overcoming the limited light harvest and sluggish charge transfer efficiency has remained a long-standing challenge for the practical application of visible-light driven hydrogen evolution . In this work, a novel cobalt doped titanium nitride interlaced nanotube was synthesized through a facile hydrothermal approach and subsequent ammonia gas nitrification route. The optimized Ti 0·75 Co 0·25 N (molar ratio of Ti:Co:N = 0.75:0.25:1) catalyst delivered the highest hydrogen yield in visible-light-induced water splitting, which was almost 2 times higher than the pristine TiN did. Further structure characterizations have unraveled that the cobalt atoms were partially substituted the titanium atoms in crystallite lattice, generating a significant synergistic regulation on band structure and electronic state. As a result, the narrowed energy bandgap, improved charge carrier mobility and lowered over-potential contributed to the high electron-hole separation efficiency and smoothed interface charge transfer, yielding an enhanced photocatalytic activity . This work is a significant contribution to the design of efficient and stable visible light driven water splitting catalysts.
研究领域:
材料科学
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催化化学
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DOI
高影响因子
Journal of the American Chemical Society
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2020
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IF 14.612
Peishen Li,Ziang Zhou,Qiang Wang,Ming Guo,Shaowei Chen,Jingxiang Low,Ran Long,Wen Liu,Peiren Ding,Yunyun Wu,Yujie Xiong
Photocatalytic nitrogen fixation represents a green alternative to the conventional Haber–Bosch process in the conversion of nitrogen to ammonia. In this study, a series of Bi5O7Br nanostructures were synthesized via a facile, low-temperature thermal treatment procedure, and their photocatalytic activity toward nitrogen fixation was evaluated and compared. Spectroscopic measurements showed that the tubular Bi5O7Br sample prepared at 40 °C (Bi5O7Br-40) exhibited the highest electron-transfer rate among the series, producing a large number of O2.– radicals and oxygen vacancies under visible-light photoirradiation and reaching a rate of photocatalytic nitrogen fixation of 12.72 mM·g–1·h–1 after 30 min of photoirradiation. The reaction dynamics was also monitored by in situ infrared measurements with a synchrotron radiation light source, where the transient difference between signals in the dark and under photoirradiation was analyzed and the reaction pathway of nitrogen fixation was identified. This was further supported by results from density functional theory calculations. The reaction energy of nitrogen fixation was quantitatively estimated and compared by building oxygen-enriched and anoxic models, where the change in the oxygen vacancy concentration was found to play a critical role in determining the nitrogen fixation performance. Results from this study suggest that Bi5O7Br with rich oxygen vacancies can be used as a high-performance photocatalyst for nitrogen fixation.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
PubMed
高影响因子
MATERIALS CHARACTERIZATION
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2020
·
IF 3.562
Xiaoxia Guo,Dan Wu,Xia Long,Zihan Zhang,Fenglin Wang,Guanghua Ai,Xiaohe Liu
The nanosheet-assembled Bi 2 WO 6 microspheres could be successfully synthesized in large quantities by a facile hydrothermal strategy in the presence of surfactant hexadecyl trimethyl ammonium bromide (CTAB) and polyvinylpyrrolidone (PVP) under mild conditions. The morphology and size of as-prepared Bi 2 WO 6 could be readily controlled by adjusting the synthetic parameters such as hydrothermal time. The probable formation mechanism of nanosheet-assembled Bi 2 WO 6 microspheres was discussed in detail. The hierarchical nanosheet-assembled microspheres could be constructed by orderly arranged nanosheets. The photocatalytic activity of the nanosheet-assembled Bi 2 WO 6 microspheres was evaluated by degrading rhodamine B (RhB) under irradiation of visible light. The brilliant photodegradation efficiency is about 98% under visible light irradiation for 50 min. The results suggest that the as-prepared Bi 2 WO 6 microspheres have good prospects as the photocatalyst for the removal of organic pollutants .
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 PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
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IF 3.306
Shuguang Li,Zhiyu Liu,Chunxiao Lu,Zhihui Qu,Congcong Piao,Jianhe Tang,Dawei Fang,Jun Wang
The use of co-catalysts can observably enhance photocatalytic hydrogen production activity. In this work, a novel visible-light driven photocatalyst, (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite, is prepared for the first time by loading Er 3+ :Y 3 Al 5 O 12 , MoSe 2 -RGO and RuO 2 on the surface of ZnS nanoparticles. Er 3+ :Y 3 Al 5 O 12 as an effective visible-to-ultraviolet up-conversion luminescence agent can provide the ultraviolet-light to activate wide band-gap ZnS. MoSe 2 -RGO and RuO 2 , acting as conduction band co-catalyst and valence band co-catalyst, respectively, can effectively separate the photo-generated carriers and supply more reactive sites. The activities of the photocatalysts were assessed via photocatalytic hydrogen production in Na 2 S and Na 2 SO 3 aqueous solution under 300 W xenon lamp irradiation. In addition, the visible-light irradiation time and used times of the prepared samples as influence factors on the photocatalytic hydrogen production were also investigated. It was easily found that the prepared (MoSe 2 -RGO)/(Er 3+ :Y 3 Al 5 O 12 /ZnS)/RuO 2 nanocomposite shows fairly high activity in photocatalytic hydrogen production, compared with single ZnS photocatalyst. It was mainly attributed to the excellent up-conversion luminescence property of Er 3+ :Y 3 Al 5 O 12 and the efficient separation of photo-generated electrons and holes caused by MoSe 2 -RGO and RuO 2 . This research may pave an effective way for photocatalytic hydrogen production utilizing solar light.
研究领域:
材料科学
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能源化学
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纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
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IF 5.155
Wei Li,Qiong Ma,Xiao Wang,Shu-ao He,Min Li,Longfang Ren
Due to the increasing pressure of social environment and the increasing demand of human for energy, it is urgent to seek a sustainable and pollution-free new energy. Hydrogen is considered as a new type of energy because of its high calorific value , no environmental pollution and low cost of raw materials. In this experiment, to improve the visible-light driven catalytic activity of two-dimensional g-C 3 N 4 , g-C 3 N 4 and Ag/AgBr nanoparticles (NPs) were used as the carrier and cocatalyst, and the g-C 3 N 4 /Ag/AgBr (CNAA-α, α = 1, 2 and 3) heterojunction photocatalysts with different amounts of Ag/AgBr were synthesized via solvothermal technology. The morphology, composition , structure, photochemical and electrochemical characteristics of the samples were analyzed through XRD , FTIR , TEM , XPS and a series of photoelectrochemical characterizations, and the visible-light driven catalytic hydrogen evolution activities of the samples were studied by catalyzing water splitting. Research showed that the CNAA-2 exhibited the smallest overvoltage (86.5 mV vs RHE) and Tafel slope (61.0 mV·dec −1 ), so that the highest photocatalytic activity (47.84 μmol·g −1 ·h −1 ) for hydrogen evolution was obtained at the absence of Pt co-catalyst. Furthermore, this heterojunction photocatalyst exhibited good photostability and could be recycled several times with no significant decrease of its activity. This indicated that the addition of Ag/AgBr NPs to the two-dimensional g-C 3 N 4 nanosheets to construct an effective p-n heterojunction system at their interfaces could promote the conduction of photo-induced carriers and inhibit their combination, so that it would significantly improve the photoresponse ability and catalytic activity of two-dimensional g-C 3 N 4 nanosheets.
研究领域:
材料科学
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环境科学
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能源科学
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产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2019
·Vol. 102
·期 9
·5484-5493
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IF 3.094
Changcun Han,Tong Zhang,Qijun Cai,Chonghao Ma,Zhengfu Tong,Zhifeng Liu
In this work, cobalt phosphide (CoP) nanoparticles were successfully decorated on an ultrathin g-C 3 N 4 nanosheet photocatalysts by in situ chemical deposition. The built-in electric field formed by heterojunction interface of the CoP/g-C 3 N 4 composite semiconductor can accelerate the transmission and separation of photogenerated charge-hole pairs and effectively improve the photocatalytic performance. TEM, HRTEM, XPS, and SPV analysis showed that CoP/g-C 3 N 4 formed a stable heterogeneous interface and effectively enhanced photogenerated electron-hole separation. UV-vis DRS analysis showed that the composite had enhanced visible light absorption than pure g-C 3 N 4 and was a visible light driven photocatalyst. In this process, NaH 2 PO 2 and CoCl 2 are used as the source of P and Co, and typical preparation of CoP can be completed within 3 hours. Under visible light irradiation, the optimal H 2 evolution rate of 3.0 mol% CoP/g-C 3 N 4 is about 15.1 μmol h −1 . The photocatalytic activity and stability of the CoP/g-C 3 N 4 materials were evaluated by photocatalytic decomposition of water. The intrinsic relationship between the microstructure of the composite catalyst and the photocatalytic performance was analyzed to reveal the photocatalytic reaction mechanism.
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
MOLECULES
·
2017
·Vol. 22
·期 5
·859
·
IF 2.861
Yuxue Zhou,Pengfei Lv,Xiangdong Meng,Yanping Tang,Pingping Huang,Xiaobing Chen,Xiaoshuang Shen,Xianghua Zeng
Two-dimensional thin Bi2WO6nanoplates have been fabricated using a cetyltrimethylammonium bromide (CTAB)-assisted hydrothermal method. We investigated the proposed formation mechanism based on the crystalline structures of the thin Bi2WO6nanoplates. The high adsorption ability and excellent visible-light driven photocatalytic activities of the Bi2WO6nanoplates were illustrated, in view of exposed (001) facets of nanoplates possessing faster separation of photo-generated charge carriers and increased catalytically active sites. Such a cost-effective way to obtain Bi2WO6nanoplates offers new possibilities for the design of adsorptive semiconductor photocatalysts with strengthened photocatalytic activities.Keywords:Bi2WO6nanoplates;semiconductor photocatalyst;visible light-driven
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
PubMed
高影响因子
Molecular Catalysis
·
2017
·
IF 0
Hong Liu,Zhe Zhang,Jingchai Meng,Jiang Zhang
Photocatalytic conversion of CO 2 into hydrocarbon fuels using semiconductor photocatalysts has attracted great attention, which is considered as a promising approach to resolve the energy shortage and greenhouse effect. In this work, ordered mesoporous g-C 3 N 4 (mpg-C 3 N 4 ) nanosheets supported CdIn 2 S 4 nanocomposites were successfully fabricated by a hard-template combinated with hydrothermal method. The hybrids showed highly efficient photocatalytic activities for the reduction of CO 2 to CH 3 OH under visible-light irradiation. The optimized CdIn 2 S 4 /mpg-C 3 N 4 photocatalyst exhibited a high CH 3 OH-production rate of 42.7 μmol g −1 h −1 at a mpg-C 3 N 4 content of 20 wt%. This rate was 1.8 times higher than that of pure CdIn 2 S 4 . The significant enhancement of photocatalystic activity was mainly ascribed to the increased CO 2 adsorption capacity and the improved separation and transfer of photogenerated electron-hole pairs at the intimate interface of CdIn 2 S 4 /mpg-C 3 N 4 heterojunctions. Furthermore, the hybrid photocatalysts displayed excellent stability under visible-light. A possible mechanism of enhanced photocatalytic activity of CdIn 2 S 4 /mpg-C 3 N 4 composite on photocatalytic reduction of CO 2 was also proposed. This work may provide some useful information for the future design and practical application of multifunctional hybrid photocatalysts in photocatalytic reduction of CO 2 .
研究领域:
材料科学
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环境科学
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能源科学
✓ 已验证
产品关联
DOI
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Chuanfeng Zang,Xiangye Han,Hao Chen,Haifeng Zhang,Yonggang Lei,Hongchao Liu,Chunxia Wang,Guangyu Zhang,Mingzheng Ge
ZnO has been widely employed in the photodegradation of pollutants; however, it exhibits poor photocatalytic performance under visible light illumination. Thus, visible-light-driven heterostructured PVDF/ZnO/Ag 2 O photocatalysts were fabricated by combining the electrospinning, hydrothermal, and in situ deposition techniques. As matrix materials, it is easy to recycle and reuse electrospun PVDF nanofibers . ZnO nanorods anchored on PVDF nanofibers with a high specific surface area provide an abundance of photocatalytically active sites. As a photosensitizer , silver oxide nanoparticles enhance the visible-light photocatalytic efficiency. Thus, the composited PVDF/ZnO/Ag 2 O photocatalysts exhibit excellent photocatalytic performance under both UV and visible light irradiation as a result of the enhanced electron-hole separation/transfer and broadened visible light absorption range. Under visible light irradiation, the kinetic constant of PVDF/ZnO/Ag 2 O nanocomposites is 24.4 and 6.73 times greater than that of PVDF/Ag 2 O and PVDF/ZnO, respectively. Moreover, the PVDF/ZnO/Ag 2 O nanocomposites exhibit advantages in recycling and reusing with high stability, thus considerably widening their practical applications in the field of environmental remediation.
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
危险品化学品经营许可证（带存储）