CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Jianhua Zheng,Lei Zhang
In this study, a novel 3D magnetic Co 3 O 4 @CoO/g-C 3 N 4 ternary hybrid possessing double Z-scheme mechanism has been designed and architected by wet-impregnation and subsequent controlled oxidation process . In the Co 3 O 4 @CoO/g-C 3 N 4 ternary hybrid system, g-C 3 N 4 ultrathin nanopieces uniformly dispersed on each nanopetal of peony flower cobalt oxides , which not only helps to enhance the light absorption efficiency and avoid the aggregation but also readily promote the separation of photo-induced charge. Benefiting from the special hierarchical architecture, large open space between nanopetals and the synergistic effect between cobalt oxides and g-C 3 N 4 , when employed as photocatalyst for reduction of nitrobenzene (NB) and degradation of tetracycline (TC), 3D Co 3 O 4 @CoO/g-C 3 N 4 exhibited superior redox reactivity. Notably, a double Z-scheme heterojunctions and well matched band structures could further facilitate effective charge transfer. Meanwhile, Co 3 O 4 @CoO/g-C 3 N 4 ternary hybrids also exhibited excellent magnetic separation property and super cycling stability after four cycles, which make it a promising candidate as a visible light photocatalyst for practical application.
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高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 7
·期 2
·437-446
·
IF 5.934
Yuwei Wang,Xianggui Kong,Meihong Jiang,Fazhi Zhang,Xiaodong Lei
A bifunctional ZnIn2S4/Nb2O5 (ZIS/NbO) photocatalyst was constructed by growing Nb2O5 nanospheres on the petals of ZnIn2S4 microspheres via a facile hydrothermal approach. The composite possessed a direct Z-scheme heterostructure that was confirmed by in situ irradiated X-ray photoelectron spectroscopy (ISI-XPS) and electron spin resonance (ESR) measurements. Owing to the good charge separation efficiency in the Z-scheme system, the lifetime of charge carriers in ZIS/NbO was obviously prolonged. Thus, the rate of hydrogen evolution for optimized ZIS/NbO was 2.8 and 1.8 times higher than that of Nb2O5 and ZnIn2S4, respectively. Furthermore, the ZIS/NbO also showed good performance for the oxidation of biomass-derived intermediate 5-hydroxymethylfurfural (HMF) to value-added products. More importantly, the coupled photocatalytic H2 reduction and HMF oxidation were achieved on the ZIS/NbO Z-scheme heterostructure at the same time. Due to the presence of a direct Z-scheme heterojunction that prevents the recombination of photogenerated electrons and holes in the composite, the ZIS/NbO displayed excellent photocatalytic performance. Our findings are expected to offer a broad optical window for fabricating bifunctional heterostructured composites for coupled photocatalytic reduction and oxidation.
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INTERNATIONAL JOURNAL OF ENERGY RESEARCH
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2019
·Vol. 44
·期 2
·833-844
·
IF 3.343
Xiao Wang,Wei Li,Shu-ao He,Qiong Ma,Bingchang Yan,Nan Meng,Lifen Hao
Summary With the improvement of people's living standard, energy shortage is increasingly severe. Photocatalysis technology is one of the most effective means to solve this problem. Generally, poor visible-light response and fast combination of photo-induced carriers are the main limiting factors to traditional photocatalysts. Aiming at this problem, in this paper, AgBr was used as the photosensitizer to immobilize on the surface of reduced graphene oxide (rGO) for the complexation of Ag + ions and carboxyl groups of precursor graphene oxide (GO), then the two-dimensional rGO-AgBr/Ag composites (2D rGAA-α, α = 1, 2 and 3) were synthesized by solvothermal method. The structures, morphologies, chemical bonding states and photoelectrochemical properties of the samples were analyzed to study the samples, and the corresponding visible-light-driven (VLD) catalytic performances were studied by hydrogen evolution reaction (HER). Compared with pure rGO, the light absorption of rGAA-α was almost extended to full spectral range for the Z-scheme heterointerface (rGO-AgBr) construction, and the separation of photo-induced carriers can be promoted effectively. The HER results showed that the average hydrogen evolution rate ( ) of rGAA-α was significantly increased, and the rGAA-2 catalyst presented the highest (72.71 μmol h -1 g -1 ). After six recycling experiments, the very faint activity decrease and unobvious structure change suggested the high photostability. Accordingly, the enhanced catalytic activity of rGAA-α catalysts was attributed to the formation of Z-scheme heterointerface and generation of Ag plasmas, so this study will provide a simple, effective and promising method for hydrogen energy development.
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MATERIALS TECHNOLOGY
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2018
·
IF 1.232
Jixiang Wang,Hongqiang Shen,Xiaohui Dai,Chunmei Li,Weidong Shi,Yongsheng Yan
The photocatalytic technology provides a simple and effective strategy for the ever-increasing environmental and energy problem. In this work, we put forward a practical method to facilitate effectively the separation of photogenerated electrons and holes by addition of graphene oxide in Ag3PO4 and Bi2O3 nanocrystals semiconductor composite. Compared with GO-single component, the three-component GO-Ag3PO4/Bi2O3 composites with the optimum Ag3PO4/Bi2O3 ratio (6:4) and content of GO (6 wt-%) presented a further improvement on the photodegradation of tetracycline by visible light irradiation driven. GO served as a medium is used to effectively transfer of the photogenerated electrons from the conduction band Bi2O3 of to the valence band of Ag3PO4, the Z-Scheme photocatalytic degradation mechanism was proposed. Our work provides an effective method for development of pragmatic photocatalyst in present environmental pollution, energy problems and other related fields.
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CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Wei Chen,Zhi-Cai He,Guo-Bo Huang,Cheng-Lin Wu,Wu-Fei Chen,Xiao-Heng Liu
Semiconductor photocatalysis has been regarded as an environmentally friendly technology in wastewater treatment and energy production. Here, a series of direct Z-scheme MnIn 2 S 4 /g-C 3 N 4 (MnISCN) photocatalysts without electron mediators were fabricated by a simple hydrothermal route on the basis of in-situ loading of MnIn 2 S 4 (MnIS) nanoflakes on the surface of g-C 3 N 4 (CN) nanosheets. Photocatalytic performances evaluated under visible light irradiation revealed these Z-scheme heterostructured photocatalysts exhibited higher photocatalytic activities than single-component samples. The effect of weight ratio between MnIn 2 S 4 nanoflakes and mesoporous CN nanosheets on photocatalytic activity towards treatment of pharmaceutical wastewater was optimized to achieve highly efficient photocatalytic activities for both degradation of pharmaceutical wastewater and hydrogen generation compared with alone MnIS nanoflakes and isolated mesoporous CN nanosheets. The significant enhancement in photocatalytic activity could be primarily ascribed to the construction of Z-scheme MnISCN architectures, which effectively accelerated the transfer and separation of photogenerated charge carriers via tight interface contacts built among these two components. The recycling experiments for pharmaceutical wastewater treatment revealed the excellent stability of MnISCN nanocomposites. The advantages of highly efficient photocatalytic activity and excellent stability endowed a promising potential for MnISCN nanocomposites to apply in photocatalytic fields.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2018
·
IF 3.779
Rongzhi Gu,Mengyuan Guan,Na Jiang,Tianyu Yuan,Guoquan Ma,Chao Wang,Zhiping Yang,Panlai Li,Zhijun Wang
Series of Ca 9- w Ce 0.5 Y 0.5- x - y - z (PO 4 ) 7 : x Tb 3+ , y Eu 3+ , z Sm 3+ , w Mn 2+ phosphors are synthesized by a high temperature solid state method. The spectral property and fluorescence decay curves are measured and used to demonstrate the energy transfer effect in Ce 3+ -Tb 3+ , Ce 3+ -Sm 3+ , Ce 3+ -Eu 3+ , Tb 3+ -Sm 3+ , Tb 3+ -Eu 3+ and Tb 3+ -Mn 2+ . For Ca 9 Ce 0.5 Y 0.5 (PO 4 ) 7 , the concentration of Ce 3+ is higher and it can act as activator and sensitizer simultaneously. Ce 3+ and Tb 3+ can emit blue and green light under near ultraviolet excitation, respectively. Sm 3+ , Eu 3+ and Mn 2+ can produce red emission. In order to generate white light, Ce 3+ /Tb 3+ /Sm 3+ , Ce 3+ /Tb 3+ /Eu 3+ and Ce 3+ /Tb 3+ /Mn 2+ doped phosphors are investigated, and Ca 8.8 Ce 0.5 Y 0.33 (PO 4 ) 7 :0.17Tb 3+ ,0.20Mn 2+ can create high quality white light. Its color rendering index can be high up to 80.2 and correlated color temperature is 4735 K, and its thermal stability is high. The result indicates that the acquired phosphors can be potential for the use of ultraviolet excited white light emitting diodes .
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JOURNAL OF MATERIALS SCIENCE
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2018
·Vol. 54
·期 1
·286-301
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IF 2.993
Fang Hongbiao,Cao Xin,Yu Jiajie,Lv Xiang,Yang Nan,Wang Tianhe,Jiang Wei
Tungsten oxide (WO 3 ) is a well-known photocatalyst, but its application is restricted due to its low conduction band and reduction power. In addition, WO 3 catalyst in powder forms has little application prospect because of difficulties in separation and regeneration. In this work, we prepared WO 3 /Ag/AgCl films on conventional glass that not only have much enhanced photocatalytic capability but also can be readily regenerated. The WO 3 film was prepared on glass substrate by calcination of spin-coated W precursor. Ag/AgCl particles were then deposited on WO 3 film by an impregnating–precipitation–photoreduction method. The photocatalytic efficiency of WO 3 /Ag/AgCl was evaluated by using methyl orange (MO) and Rhodamine B (RhB) as target pollutants. The highest photocatalytic performance was achieved with the 3-WO 3 /Ag/AgCl film, being 18 and 13 times higher than that of pure WO 3 film for degradation of MO and RhB, respectively. The degradation rate for both MO and RhB by 3-WO 3 /Ag/AgCl film catalyst decreased by less than 5% after five cycled tests. The photodegradation mechanism was discussed based on the electrochemical impedance spectroscopy Nyquist tests, photoelectrochemical analysis and reactive oxygen species scavenging experiments. A possible all-solid-state Z-scheme mechanism is proposed based on the photoelectron chemical tests and radical trapping experiments. This study provides a feasible technique to prepare a photocatalytic film with practicability and reproducibility.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Zhi Zhu,Pengwei Huo,Ziyang Lu,Yongsheng Yan,Zhi Liu,Weidong Shi,Chunxiang Li,Hongjun Dong
A novel efficient magnetic oxidation-reduction like-Z-scheme structure photocatalyst composed of g-C 3 N 4 , CdS and the oxidation-reduction mediators of Fe 3 O 4 is successfully synthesized by heat treatment methods. The like-Z-scheme CdS/Fe 3 O 4 /g-C 3 N 4 photocatalyst exhibits universal degradation property on removing kinds of antibiotics, and the photocatalytic activity is better than that of CdS/g-C 3 N 4 and pure g-C 3 N 4 . The excellent photocatalytic performance is originated from the unique like-Z-scheme structure and oxidation–reduction function of Fe 3 O 4 , which effectively separates the hole-electron and sufficiently utilizes the photogenerated carriers for generating more active radicals. The results showed that when the content of Fe 3 O 4 is 10%, the CdS/Fe 3 O 4 /g-C 3 N 4 exhibited superior activity. The best degradation rate constant K in the like-Z-scheme photocatalyst is approximately 26 times of pure g-C 3 N 4 . The important role of Fe 3 O 4 and the photocatalytic mechanism are also discussed in detail. This work not only puts forward a novel design idea of the like-Z-scheme material, but also is expected to be widely applied to the universal removal of kinds of antibiotics according to the practical requirement.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
·
IF 8.328
Haiping Li,Tingxia Hu,Renjie Zhang,Jianqiang Liu,Wanguo Hou
Up to now, studies on solid-state Z-scheme two-component heterojunctions have hardly referred to roles of interfacial internal electric fields (IEFs). Herein, solid-state Z-scheme Bi 2 MoO 6 /MO (M = Cu, Co 3/4 , or Ni) heterojunction photocatalysts were simply synthesized, for the first time, with enhanced photocatalytic performance toward organic degradation. Electron microscopy images reveal that the MO homogeneously distributes on surfaces of the Bi 2 MoO 6 hierarchical microspheres, and they close contact with distinct heterojunction interfaces. X-ray photoelectron spectra (XPS) suggest that the electron transfer occurs between the Bi 2 MoO 6 and MO after they contact, resulting in formation of IEFs at their interfaces. Based on band gap values and valance-band XPS and ultraviolet photoelectron spectra, energy band levels of the Bi 2 MoO 6 and MO are defined, and directions of the interfacial IEFs are determined. The IEFs play key roles for the formation of the Z-scheme Bi 2 MoO 6 /MO heterojunctions and for the photoactivity enhancement. This work provides a better insight into the formation mechanism of solid-state two-component Z-scheme heterojunctions and a significant experimental guidance for studying other similar systems.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Haomiao Cao,Zhaoyi Yin,Xiaoyi Dong,Yongjin Li,Yong Yang,Jianbei Qiu,Zhengwen Yang,Zhiguo Song
Exploring strategies to improve the near-infrared response of photocatalysts is an urgent challenge that can be overcome by utilizing upconversion (UC) luminescence to enhance photocatalysis. This paper reports the fabrication of a ZnO/Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (ZnO/BTOFYE) Z-scheme heterojunction based on a Bi 3 Ti 2 O 8 F:Yb 3+ , Er 3+ (BTOFYE) UC photocatalyst via electrostatic self-assembly. Fermi energy difference at the interface of BTOFYE and ZnO generates a strong internal electric field (IEF) in the Z-scheme heterojunction, offering a novel charge transfer mode that promotes carrier transfer and separation while retaining the strong redox capability. These results are confirmed through in situ X-ray photoelectron spectroscopy, in situ Kelvin probe force microscopy, electron spin resonance, and density functional theory calculations. In addition, the effect of the IEF on the UC luminescence process of Er 3+ enhances the luminescence intensity, considerably improving the UC utilization efficiency. The optimal ZnO/BTOFYE degrades 64 % of ciprofloxacin in 120 min, which is 2.3 times more than that degraded by BTOFYE. Overall, the results of this study offer a reference for the rational development of high efficiency UC photocatalysts by generating IEF in Z-scheme heterojunctions.
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PubMed
高影响因子
JOURNAL OF RARE EARTHS
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2024
·
IF 5.2
Shihai Cao,Haocheng Yang,Cheng Cheng,Jinheng Dai,Shuaishuai Lu,Yao Lu
Photocatalytic technology has been proven to be a simple and effective method for degrading recalcitrant organic pollutants. In this study, a series of Z-scheme heterojunction nanocomposites composed of CeO 2 and terephthalic acid-modified WO 3 was prepared and further used as photocatalysts for perfluorobutane sulfonate (PFBS) degradation. In this design, terephthalic acid was used as an electron recombination center and heterojunction mediator, which effectively enhances the migration ability of electron–hole pairs and the physicochemical stability of the catalyst. In addition, in situ synthesis of CeO 2 onto the WO 3 surface by the coordinate bond between terephthalic acid and Ce ions can avoid CeO 2 agglomeration. As a result, the CeO 2 @WO 3 photocatalyst exhibits excellent PFBS degradation ability (94% for CeO 2 @WO 3 vs. 19% for CeO 2 ). After the fifth cyclic degradation experiment, the CeO 2 @WO 3 photocatalyst still maintains stable degradation efficiency. Furthermore, the reaction mechanism of the PFBS in CeO 2 @WO 3 photocatalytic process was analyzed by free radical trapping experiment and liquid chromatography tandem mass spectrometry (LC-MS) technique. This study provides new insights for constructing Z-scheme heterojunction and demonstrates that CeO 2 @WO 3 photocatalysts possess a promising prospect for degrading PFBS pollutants.
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APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Kuan Wang,Tong-Le Dang,Sheng-Li Lv,Xin-Peng Li,Kai-Xiong Dai,Zhen-Hong He,Weitao Wang,Huan Wang,Zhao-Tie Liu
The photo-thermo synergy catalytic cyclohexane oxidation has been identified as an efficient and environmentally friendly approach for the preparation of cyclohexanone and cyclohexanol (KA oil). However, this strategy encountered several challenges that impeded its implementation for the one-step production of adipic acid (AA), highlighting the need for further advancements. Herein, a robust strategy for tailoring multi-channel charge transfer pathways in LaVO 4 /WO 3 @H x V 2 O 5 nanospherical composites was developed by constructing double Z-scheme heterojunctions. The LaVO 4 /WO 3 @H x V 2 O 5 exhibited exceptional photothermal catalytic performance for the cyclohexane oxidation, achieving the cyclohexane conversion of 11.01 % with the total selectivity of 96.38 % (solid product AA of 58.51 % and liquid product KA oil of 37.87 %). The exceptional performance of LaVO 4 /WO 3 @H x V 2 O 5 can be ascribed to the double Z-scheme heterojunctions with multi-channel charge transfer and high redox potentials, which facilitates the efficient separation and transfer of photo-generated electron-hole pairs. This deliberate design of double Z-scheme heterojunctions provides valuable insights into the meticulous construction of efficient pathways with multi-channel charge transfer for the field of photothermal catalysis applications.
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