OPTICAL MATERIALS
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2022
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IF 3.754
Di Xie,Shuo Zhang,Tianyu Wu,Mei He,Yiyan Cai,Panpan Zhao,Fangchao Cheng
The MnFe 2 O 4 /g-C 3 N 4 composites with promising photocatalytic activity were successfully prepared in this study. The structure and morphology of the as-prepared composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and ultraviolet–visible diffuse reflectance spectroscopy (UV–Vis DRS), and the photocatalytic activity was evaluated through the degradation of rhodamine B (RhB). It was found that the composites with 30 wt% MnFe 2 O 4 possessed 2.64 times higher photocatalytic activity than that of pure g-C 3 N 4 , and the degradation rate of 30 mg/L RhB solution could reach 97.2% in 90 min under 1 sun irradiation. The promising photocatalytic activity of the composites was mainly attributed to excellent adsorption performance and light absorption capacity of the sample. Simultaneously, the recombination of photogenerated electron-hole pairs was delayed due to the formation of heterojunction between MnFe 2 O 4 and g-C 3 N 4 , and MnFe 2 O 4 /g-C 3 N 4 showed almost no decrease in photocatalytic activity after recycling for five times.
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
JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 33
·12479-12484
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IF 5.101
Liqun Ye,Lihong Tian,Tianyou Peng,Ling Zan
Highly symmetrical BiOI single-crystal nanosheets (BiOI SCNs) with dominant exposed {001} facets (up to 95%) have been synthesized by annealing BiI3 and characterized by X-ray diffraction, X-ray photoelectron spectroscopy, field emission scanning electron microscopy, transmission electron microscopy, selected area electron diffraction, high-resolution transmission electron microscopy, fast-Fourier transform pattern, UV-vis diffuse reflectance and photoluminescence. The thickness and the {001} facets percentage of BiOI SCNs can be tuned by changing the annealing temperature. The thermal decomposition process of BiI3 and the formation mechanism of BiOI SCNs were investigated. BiOI SCNs exhibit higher photoactivity (about 7 times) than irregular BiOI for degradation of Rhodamine B (RhB) dye under visible light irradiation. The {001} facets are the reactive facets of BiOI. The origin of {001} facets-dependent photoactivity is due to an improvement of the separation efficiency of photo-induced electrons and holes.
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
ELECTROCHEMISTRY COMMUNICATIONS
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2016
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IF 4.569
Hua-Bin Fang,Nan Li,Zhibing Xue,Yikun Zhang,Yan-Zhen Zheng,Xia Tao
Tungsten disulfide (WS 2 ) has recently emerged as a narrow-band visible-light-driven photocatalyst; however, high recombination of photo-induced electrons and holes becomes a major concern to advance its photocatalytic performance. Here we for the first time adopt manganese oxide (MnO x ) as a hole-trapping material to decorate WS 2 nanosheets by photo-deposition in MnSO 4 solution. The MnO x decorated WS 2 (MnO x /WS 2 ) is found to exhibit more negative flat band potential, lower impedance and higher photocurrent response compared with pure WS 2 . These features beneficial to charge transfer and separation render the MnO x /WS 2 nanosheets highly active and visible-light-driven photocatalyst in RhB degradation. Further, the hole-trapping function of MnO x in promoting efficient charge separation of MnO x /WS 2 is experimentally demonstrated.
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
RESEARCH ON CHEMICAL INTERMEDIATES
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2022
·Vol. 49
·期 1
·101-119
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IF 3.134
Chen Fenghua,Yang Maosen,Shi Xiangdong,Qin Xiaoyun,Chen Qingtao,Jiang Liying,Jia Chunxiao
In order to increase the photocatalytic performance of titanium dioxide mesocrystals (TMCs), in this study, Ag nanoparticles with different mass content were first photodeposited on the surface of as-prepared TMCs to form heterostructured Ag–TMCs catalysts, followed by loading them on g-C 3 N 4 via one step “bottom-to-up” calcination method. The results of photocatalytic degradation toward RhB experiments showed that the prepared ternary photocatalyst of g-C 3 N 4 /Ag–TMCs exhibited excellent photocatalytic activity not only compared with the bare TMCs and Ag–TMCs, but also with all of those reported TiO 2 /Ag/g-C 3 N 4 ternary photocatalysts. Such improved photocatalytic properties were attributed to the synergistic effect created by the LSPR effect and an important role as an electron-conduction bridge of Ag and the existence of heterojunction structure formed between Ag, TMCs and the further coupling g-C 3 N 4 , which added to the evidences that enabled the prepared g-C 3 N 4 /Ag–TMCs catalyst enhanced transfer efficiency of photogenerated carriers and suppressed recombination rate of electron-hole pairs. Moreover, the deposited Ag content had a positive effect on the photocatalytic degradation efficiency. On the basis of the results of this study, the specimen of g-C 3 N 4 /9% Ag–TMCs showed RhB degradation efficiency up to 100% under only 15 min visible-light irradiation. A possible degradation mechanism was also proposed based on several characterizations including photoluminescence spectrum and a serious of photoelectrochemical measurements. Overall, the prepared g-C 3 N 4 /Ag–TMCs ternary photocatalyst with good recyclability looked promising for future practical applications in the visible-light photodegradation 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
FUEL
·
2024
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IF 6.7
MingCheng Yang,Chuan Lai,ChunTan Chen,Ying Li,Lu Chen
Fabricating type-II heterostructures to accelerate the charge separation of the photocatalysts has been considered as a prospective strategy to improve the photocatalytic performance. Herein, a novel type-II photocatalytic heterojunction was fabricated by integrating Cu 3 P on nanosheet CdIn 2 S 4 to accelerate carrier separation, enhancing the RhB degradation and H 2 evolution performance. The Cu 3 P/CIS composite achieved complete RhB degradation within 40 min and an impressive 95 % photodegradation efficiency for RhB. Quenching experiments and electron spin resonance (ESR) measurements confirmed that the ·O 2 – plays an important role in the degradation of RhB. Meanwhile, the optimal Cu 3 P/CdIn 2 S 4 photocatalyst shows a high hydrogen evolution rate of 1058 umol ·g −1 ·h −1 , which was 7 and 1.8 times higher than that of pure CIS. The outstanding photocatalytic performance was ascribed to the robust built-in electric field at the interface between two components driving force for electron migration.
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
CRYSTENGCOMM
·
2011
·Vol. 13
·期 7
·2381-2390
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IF 4.006
Jinyan Xiong,Gang Cheng,Zhong Lu,Jiale Tang,Xianglin Yu,Rong Chen
Different shaped bismuth oxide formate (BiOCOOH), including spherical-like, sponge-like, tremella-like, flower-like hierarchical nanostructures have been successfully synthesized through a facile and template-free solvothermal process in different solvents. The products were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflection spectroscopy (DRS) and nitrogen adsorption. Based on the electron microscopy observations of the products obtained under different experimental conditions, a possible growth mechanism which involves Ostwald ripening and self-assembly process was proposed. It was found the solvent plays a crucial role in the formation of the BiOCOOH hierarchical nanostructures. The optical properties, Brunauer–Emmett–Teller (BET) surface areas and photocatalytic activities on the degradation of Rhodamine B (RhB) of the different BiOCOOH hierarchitectures were also evaluated. The results indicated that the synthesized sponge-like BiOCOOH hierarchical nanostructures possessed favorable recycling characteristics, and exhibited the highest photocatalytic activity compared with other BiOCOOH hierarchitectures, because of its largest surface area (30.28 m2 g−1) and large band gap (3.46 eV). This work not only provides new strategies for the controllable synthesis of other novel hierarchical materials, but also develops new promising photocatalysts for degrading organic pollutants and explores significant potential applications in environment pollution.
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
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2019
·
IF 3.261
Lingling Wang,Penglun Zheng,Xuefei Zhou,Mingzhen Xu,Xiaobo Liu
Novel CdS/UiO-66-NH 2 heterojunction photocatalysts have been successfully fabricated via facile water bath deposition. Compared with the traditional preparation technology, such strategy introduces deionized water as solvent, reduces production cost and simplifies the fabrication process of the heterojunction photocatalyst. Characterizations indicate that CdS nanoparticles (NPs) are uniformly interspersed on the surface of UiO-66-NH 2 and the intimate contacted heterojunction interface is generated to prevent recombination of photogenerated charge carriers. CdS/UiO-66-NH 2 with a mass ratio of 1.5:1 (CdS: UiO-66-NH 2 ) exhibits the highest photocatalytic degradation rate for RhB of approximately 92.5% in 40 min and excellent photostability through four recycles. Furthermore, Photoluminescence (PL) spectra, UV–vis diffuse reflectance spectra (DRS), transient photocurrent, electrochemical impedance spectra (EIS), Nyquist plots and Mott-Schottky plots are applied to characterize the photoelectrochemical properties. The observably enhanced photocatalytic performance can be attributed to: 1) larger specific surface area, increased photocatalytic active sites, intimate contacted interface, 2) created n-n type heterojunction, and 3) rapid separation and transfer of photoexcited interfacial charges.
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
Catalysis Science & Technology
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2022
·Vol. 12
·期 8
·2659-2669
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IF 6.177
Maoqi Li,Jian Wu,Guoliang Shen
Photocatalytic water splitting for hydrogen production and water pollutant degradation is a frontier topic to solve energy and environmental problems. In particular, applying electric and magnetic fields on photocatalysts is the most promising solution to improve their catalytic activity. In this work, bifunctional catalyst PDDA-coated β-Fe2O3 nanoclusters (β-Fe2O3@PDDA) have been successfully synthesized by a simple one-pot method at 200 °C. β-Fe2O3@PDDA exhibits excellent photoelectrocatalytic (PEC) activity for the oxygen evolution reaction (OER) with an overpotential of 300 mV, Tafel slope of 45 mV dec−1 and good catalytic stability. Moreover, β-Fe2O3@PDDA exhibited a good magnetic field-enhanced photocatalytic (MF-PC) RhB degradation activity under artificial simulated sunlight; the photocatalytic efficiency can be improved by 44% under an external magnetic field than that without a magnetic field. The surface PDDA-coated β-Fe2O3 can be stably dispersed in water for more than 10 days without agglomeration, which is of great significance for the MF-PC degradation of water pollutants in practical applications. The high catalytic activity for MF-PC is attributed to the magnetic field-suppressed electron–hole recombination and the spin-polarized properties of β-Fe2O3 in photocatalysis. Our study provides a new strategy for the preparation of highly dispersed β-Fe2O3 nanoclusters under mild conditions and the development of ultrastable organic/inorganic composite photocatalysts. This opens up a new avenue for developing electric and magnetic field-enhanced photocatalysts for use in clean energy and environmental control.
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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DOI
高影响因子
RSC Advances
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2017
·Vol. 7
·期 39
·24097-24104
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IF 3.108
Jie Meng,Jingyuan Pei,Zefang He,Shiyan Wu,Qingyun Lin,Xiao Wei,Jixue Li,Ze Zhang
Graphitic carbon nitride (g-C3N4) nanosheets loaded with WO3 nanoparticles were prepared via heat treatment of g-C3N4 together with WOx-EDA nanobelts. The thermal treatment temperature and WOx-EDA precursor play the key role in enhancing the interaction between WO3 nanoparticles and g-C3N4 nanosheets, because the temperature of thermal decomposition of WOx-EDA (∼400 °C) is close to the thermal exfoliation temperature of g-C3N4. The structure evolution and promotion effect of the nanocomposites in photocatalytic performance were well studied. It is found that WO3 nanoparticles uniformly dispersed on the surface of the g-C3N4 nanosheets, and the close integration of WO3 and g-C3N4 lead to the high photocatalytic activity in the degradation of RhB under visible light irradiation. Meanwhile, a larger specific area and increase of visible light absorption are also of benefit to speed up the degradation of organic dye. Also, the mechanism of the photocatalytic reaction and its reutilization properties were investigated.
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
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Junhua Li,Xiaowei Wei,Xi-xi Sun,Ruichen Li,Chao Wu,Jiayang Liao,Ting Zheng,Jiagang Wu
Piezocatalysis is regarded as a fascinating technology for water remediation and possible disease treatment. A high piezoelectric coefficient (d33) is one of the most important parameters to determine piezocatalytic performance, which can be manipulated via phase boundary design. Herein, a novel strategy for excellent piezocatalytic activity in lead-free BaTiO3-based materials via manipulating the multiphase coexistence is proposed. The piezocatalyst of 0.82Ba(Ti0.89Sn0.11)O3-0.18(Ba0.7Ca0.3)TiO3 (0.82BTS-0.18BCT) with multiphase coexistence is prepared, and a large d33 can be obtained. As a result, 0.82BTS-0.18BCT exhibits excellent piezocatalytic performance for the degradation of Rhodamine B (RhB). Furthermore, the removal rate of RhB could reach more than 90% after vibration for 30 min, and the reaction rate constant (k) could reach 0.0706 min–1, which is much superior to that of most other representative perovskite-structured piezoelectric materials. Excellent piezocatalytic performance can be attributed to the strong local ferro-/piezoelectric response induced by the multiphase coexistence, as confirmed by the in situ piezoresponse force microscopy (PFM). Finally, the piezocatalytic degradation mechanism is analyzed systemically and proposed. This work not only provides a high-efficiency piezocatalyst but also sheds light on developing efficient BT-based piezocatalysts by manipulating the multiphase coexistence.
研究领域:
材料科学
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环境科学
·
化学工程
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DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Qiang Li,Lijie Wang,Jupu Song,Linshen Zhang,Chunfeng Shao,Hong Li,Hemin Zhang
Construction of heterojunction photocatalysts is a valid tactics to boost the photocatalytic property of catalyst. Herein, a novel S-scheme heterojunction of zero/three dimensional (0D/3D) In 2 S 3 /Bi 2 WO 6 hybrid catalyst was obtained by assembling In 2 S 3 nanoparticles on floriated shaped Bi 2 WO 6 microsphere through a simple precipitation route for the first time. The morphology, structures, composition, chemical and optical properties of the resulting materials were carefully researched through various instruments. The degradation experiments revealed that In 2 S 3 /Bi 2 WO 6 composites exhibited superior photocatalytic behavior for dyes decomposition. The optimized In 2 S 3 /Bi 2 WO 6 composite showed remarkable photocatalytic decomposition Rhodamine B (RhB) and Methylene blue (MB), 16.0 (2.68)-fold and 70.3 (1.66)-fold larger than that of pristine Bi 2 WO 6 (In 2 S 3 ), and it also possessed good stability and reusability. The largely improved photoactivity may derive from the formed S-scheme heterojunction between Bi 2 WO 6 and In 2 S 3 , which accelerated photocarriers disassociation and retained strong redox power. Liquid chromatography-mass spectrometry (LC-MS) was applied to reveal the RhB decomposition pathway. Besides, the S-scheme charge transfer mechanism was well elucidated based on in-situ X-ray photoelectron spectroscopy analysis, density functional theory calculation (DFT), and trapping experiment along with electron paramagnetic resonance (EPR) tests.
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
CHEMOSPHERE
·
2020
·
IF 5.778
Junyang Zhang,Haijian Tong,Wenkai Pei,Wenhua Liu,Fengyan Shi,Yan Li,Yuning Huo
A synergistic system of integrated photocatalysis-adsorption-membrane separation in a rotating reactor was designed. The composite membrane was prepared via filtration process under vacuum, and it was composed of graphene oxide (GO) acted as the separation membrane, activated carbon (AC) as the adsorbent and Ag@BiOBr as the photocatalyst, respectively. In this Ag@BiOBr/AC/GO membrane system, rotation of the membrane could avoid the light-shielding effect from organic color pollutants to achieve the complete removal of pollutants. More importantly, the synergistic effect among photocatalysis , adsorption and membrane separation in rotating reactor was significant for the efficient removal of rhodamine B (RhB). In the Ag@BiOBr/AC/GO composite membrane, GO membrane layer could reject the organic molecular by the assistance of AC layer with efficient adsorption capacity, and Ag@BiOBr at outer layer could photodegrade the organics under visible light irradiation. The photocatalysis process could solve the problem of membrane fouling and adsorption could assist GO membrane for stopping the permeation of pollutants. Meanwhile, GO membrane was not only beneficial for catalyst recovery, but also could concentrate the pollutants via the membrane separation to accelerate the photocatalytic degradation . At the same time, both the photocatalysis degradation and membrane separation could promote the adsorption ability of AC. This synergistic system showed the significant potential for the practical application in the future.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
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