JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Shiming Zhang,Songyu Fan,Ting Liang,Jingwen Wei,Tingting Zhu,Yuxiang Shen,Zebin Yu,Hongxiang Zhu,Shuangfei Wang,Yanping Hou
Photocatalytic conversion of carbon dioxide (CO 2 ) into high value-added chemicals is an attractive yet challenging process, primarily due to the readily recombination of hole-electron pairs in photocatalysts. Herein, dual-oxygen-vacancy mediated Z-scheme Bi 2 Sn 2 O 7 /Sn/NiAl-layered double hydroxide (V O,O -20BSL) heterojunctions were hydrothermally synthesized and subsequently modified with Sn monomers to enhance photocatalytic activity toward CO 2 reduction. The abundance of oxygen vacancies endowed the V O,O -20BSL with extended optical adsorption, enhanced charges separation, and superior CO 2 adsorption and activation. The interfacial charges transfer of the V O,O -20BSL was demonstrated to follow a Z-scheme mechanism via photochemical deposition of metal/metal oxide. Under visible light irradiation, the V O,O -20BSL exhibited the highest yields of carbon monoxide (CO) and methane (CH 4 ), with values of 72.03 and 0.85 umol·g −1 ·h −1 , respectively, which were 2.66 and 1.57 times higher than that of the V O -NiAl-layered double hydroxide (V O -1LDH). In situ diffuse reflectance infrared fourier transform spectroscopy (DRIFTS) revealed that carboxylic acid groups (COOH*) and aldehyde groups (CHO*) were the predominant intermediates during CO 2 reduction, and accordingly, possible CO 2 reduction pathways and mechanism were proposed. This study presents a feasible approach to incorporate dual vacancies into Z-scheme heterojunctions for CO 2 reduction.
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高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Haopeng Jiang,Xiaohui Yu,Jinhe Li,Lele Wang,Weikang Wang,Chunxia Wu,Liyong Tang,Qinqin Liu
Herein, a NH 2 -MIL-125(Ti)@Ag@AgCl (NM@Ag@AgCl) stacked core–shell heterojunction with Z-scheme carrier transfer mechanism was developed to fulfil the goal of synchronous reactions of CO 2 reduction and H 2 O oxidation. In detail, the NM@Ag@AgCl was obtained by in-situ loading the AgCl as the shell-inorganic semiconductor on the octahedral NM as the core-organic semiconductor, followed by in-situ transforming part of the AgCl shell into the plasmonic Ag nanoparticles using a photo-reduction method. As a result, the interface effects of core–shell architecture majorized by the Ag electronic mediator can favor the transmission of photogenerated carriers and reduce electron transport resistance; while the plasmonic Ag mediated Z-scheme mode with a giant internal electronic field provided a strong driving force to recombine the carriers with weak redox ability, reserving the carrier with strong redox ability on the NH 2 -MIL-125-core and AgCl-shell for the simultaneous reactions. The CO and H 2 O 2 yields of the optimal NM@Ag@AgCl were 6.02 and 5.43 μmol⋅g −1 ⋅h −1 , which were 3.31 and 4.02 times that of the NM, respectively. This study furnishes a novel thread for the design of core–shell organic–inorganic heterojunction with high interfacial charge transfer for realizing the simultaneous reactions.
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DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 41
·15797-15805
·
IF 4.569
Jiawei Wu,Bangfu Ding,Xin Qian,Liang Mao,Huibin Zheng,Lei Zhang,Shukai Zheng,Junying Zhang
The Bi2MoO6 nanosheets are loaded on to γ-Bi2O3 tetrahedron surfaces to form Bi2MoO6/γ-Bi2O3 heterojunctions using a simple calcination method. The photocatalytic degradation efficiencies of the lomefloxacin and the Rhodamine B using the optimum sample are 96% and 99%, respectively, much higher than that of pure phase samples. When the waters from different regions in China were used as solvents, the removal efficiencies of the lomefloxacin and the Rhodamine B are still higher than 88% and 90%, respectively, which shows excellent prospects for practical applications. The photocatalytic degradation efficiencies of these two pollutants are higher than 91% and 95% in the five cycling tests, and the crystal structure of the sample is not changed after cycling. Based on the first-principles calculation, Bi2MoO6 and γ-Bi2O3 form a Z-type energy band structure which accelerates the separation of the photogenerated charge carriers. The Bi2MoO6 valence band potential of 3.25 V and the γ-Bi2O3 conduction band potential of −0.21 V are reserved to generate ˙OH− and O2−, respectively, for the photocatalytic reaction. The degradation of the lomefloxacin is ascribed to the shedding of functional groups and bond breaking with the final products being CO2, F−, H2O, and NO3−. This research shows that Bi2MoO6/γ-Bi2O3 heterojunctions can be employed to purify domestic and textile industrial sewage.
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Toxics
·
2022
·Vol. 10
·期 10
·555
·
IF 4.472
Tingting Liu,Fanyu Yang,Liming Wang,Liang Pei,Yushan Hu,Ru Li,Kang Hou,Tianlong Ren
The application of semiconductor photocatalysts with narrow band gaps is hindered by the rapid recombination of electron–hole pairs and limitation of multiple reactive oxygen species (ROS) synchronous generation. A n–n-type direct Z-scheme heterostructured photocatalyst was constructed based on the staggered band alignment of bismuth tungstate (Bi2WO6) and indium zinc sulfide (ZnIn2S4) to reveal the synergistic effect of charge separation and multiple ROS synchronous generation on boosting photocatalytic performance. Under irradiation, electrons in the conduction band (CB) of Bi2WO6and holes in the valence band (VB) of ZnIn2S4recombined at interface to prolong the lifetime of electrons in the CB of ZnIn2S4and holes in the VB of Bi2WO6. Meanwhile, the multiple ROS synchronously generated to oxidize pollutant due to the strong redox ability of electrons of ZnIn2S4and holes of Bi2WO6, which was determined by the CB potential of ZnIn2S4and VB potential of Bi2WO6. The results provided valuable insights for the application of photocatalysts with a narrow band gap in the field of water pollution control.Keywords:photocatalysis;direct Z-scheme heterojunction;charge separation;redox ability;photoelectrochemical property
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yi Wang,Jixiang Xu,Jun Wan,Jing Wang,Lei Wang
Developing a photocatalyst for efficient reduction of carbon dioxide (CO 2 ) is a long-term goal to address global climate change. In this work, a tube-like indium oxide@indium phosphide/cuprous oxide ( In 2 O 3 @InP/Cu 2 O) photocatalyst was prepared by annealing-phosphidation of In-Materials of Institute Lavoisier-68 (In-MIL-68) followed by electrodeposition of Cu 2 O, which was used to reduce CO 2 with water under light irradiation . Partial phosphidation of In 2 O 3 endowed In 2 O 3 @InP/Cu 2 O with strong light-harvesting ability. The In 2 O 3 @InP heterojunction combined with in situ loaded Cu 2 O provided a dual Z-scheme heterojunction for efficient electrons-holes separation. Under the synergisms of each component, the optimized In 2 O 3 @InP 60 /Cu 2 O-1 exhibited strong adsorption of CO 2 and excellent photocatalytic performance in CO 2 reduction. The yields of CO and CH 4 were 13.7 and 38.8 μmol g −1 , respectively, after 5 h simulated light illumination, higher than the corresponding yields with In 2 O 3 (CO: 7.2 μmol g −1 , CH 4 : 13.2 μmol g −1 ). This study may provide some insights into the design of specific ternary photocatalysts with dual Z-scheme charge transfer mode for CO 2 reduction.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xintong Yao,Xue Jiang,Dafeng Zhang,Shuya Lu,Mengyao Wang,Sihan Pan,Xipeng Pu,Junchang Liu,Peiqing Cai
The key to obtain effective photocatalysts is to increase the efficiency of light energy conversion, and thus the design and implementation of full-spectrum photocatalysts is a potential approach to solve this problem especially by extending the absorption range to near-infrared (NIR) light. Herein, the improved full-spectrum responsive CuWO 4 /BiOBr:Yb 3+ ,Er 3+ (CW/BYE) direct Z-scheme heterojunction was prepared. The CW/BYE with CW mass ratio of 5% had the best degradation performance, and the removal rate of tetracycline reached 93.9% in 60 min and 69.4% in 12 h under visible (Vis) and NIR light, respectively, which were 5.2 and 3.3 times of BYE. According to the outcome of experimental, the reasonable mechanism of improved photoactivity was put forward on the basis of (i) the up-conversion (UC) effect of Er 3+ ion to convert NIR photon to ultraviolet or visible light, which can be used by CW and BYE, (ii) the photothermal effect of CW to absorb the NIR light, increasing the local temperature of photocatalyst particle to accelerate the photoreaction, and (iii) the formed direct Z-scheme heterojunction between BYE and CW to boost the separation of photogenerated electron-hole pairs. Additionally, the excellent photostability of the photocatalyst was verified by cycle degradation experiments. This work opens up a promising technique for designing and synthesizing full-spectrum photocatalysts by utilizing synergetic effects of UC, photothermal effect and direct Z-scheme heterojunction.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Yi Wang,Xinyan Xiao,Tingting Ding,Mingli Lu
The transition-metal dichalcogenides (TMDs) with 1T phase structure holds great promise for providing abundant active sites and superior conductivity, while the achievement of highly efficient degradation activity over bare TMDs and TMDs-based photocatalysts is still challenges. In this work, a flower-like mixed 1T-2H phase MoSe 2 was synthesized via a sodium borohydride (NaBH 4 )-assisted solvothermal method, and then was selected as a “charge-transfer-bridge” to fabricate a dual Z-scheme AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite with a 0D/3D hierarchical structure. The optimal AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 composite exhibited the superior photocatalytic activity towards degrading RhB and TC relative to AgI/2H MoSe 2 /Bi 4 O 5 Br 2 and AgI/Bi 4 O 5 Br 2 . The enhancement is attributed to its better light absorption, abundant active sites, and superior charge carrier mobility and separation efficiency, resulted from synergetic effect of 0D/3D structural coupling and energy band matching. Moreover, the important energy band alignments and mixed 1T-2H phase MoSe 2 boosting photocatalytic mechanism of as-prepared AgI/1T-2H MoSe 2 /Bi 4 O 5 Br 2 heterojunction were investigated. This work describes a competitive design and fabrication technique for constructing novel mixed phase TMDs-based Z-scheme heterojunctions to address environmental issues.
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2021
·
IF 4.291
Chang Feng,Zhuoyuan Chen,Jiangping Jing,Mengmeng Sun,Jing Han,Ke Fang,Weibing Li
Hierarchical structure can significantly increase the reactive sites and provide advantages for heterojunction engineering in the field of photocatalysis. However, it is still a great challenge to realize efficient photocatalytic hydrogen production by controlling the band structure and constructing Z-scheme heterojunction system based on the hierarchical photocatalyst. In this paper, a CdS/Co 9 S 8 Z-scheme heterojunction system was prepared by depositing CdS nanoparticles on nanoflower-structured Co 9 S 8 hierarchical photocatalyst, which showed enhanced photocatalytic hydrogen production performance. The photocatalytic hydrogen production rate of the CdS/Co 9 S 8 Z-scheme heterojunction system is 11.60 mmol g −1 h −1 , which is 13.6 and 55.2 times that of CdS and Co 9 S 8 , respectively. The synergistic effect of the hierarchical structure and the Z-scheme heterojunction makes the photogenerated charge carriers quickly and efficiently transfer to the surface of the photocatalyst, which accelerates the photocatalytic hydrogen production process.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Dashi Lei,Juanqin Xue,Xiangyu Peng,Shuhao Li,Qiang Bi,Changbin Tang,Liang Zhang
In this work, direct Z-Scheme photocatalyst (ZnFe 2 O 4 /g-C 3 N 4 ) was employed to purify Cr(VI) and As(III) in wastewater. Results showed that Cr(VI) and As(III) was completely removed in a wide pH range of 3–7 under visible light irradiation. During photo reaction, oxalate enhanced the generation of Fe(II) and CO 2 − , which were beneficial for formation of OH and O 2 − . In photocatalytic system, Fe(II), photogenerated electron, as well as CO 2 − contributed to Cr(VI) reduction, OH and O 2 − were responsible for treatment of As(III). Moreover, ZnFe 2 O 4 /g-C 3 N 4 was easily recycled by magnetic separation, and presented an excellent reuse ability in treatment of Cr(VI) and As(III).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Guojun Li,Jia Guo,Yangyun Hu,Yanan Wang,Jianbo Wang,Shule Zhang,Qin Zhong
In this study, a novel ternary Z-scheme Graphite-like Carbon Nitride (g-C 3 N 4 )/Silver (Ag)/Silver Phosphate (Ag 3 PO 4 ) photocatalyst was designed and prepared using a two-step method (sodium chloride (NaCl) template-assisted strategy plus selective deposition). Its photocatalysts performance against removing 400 ppm of Nitric Oxides (NOx) was then investigated. We found 50 wt% g-C 3 N 4 /Ag/Ag 3 PO 4 (AP-CN 2:1) catalyst removes up to 74% of NO in 90 min under the illumination of visible light (>420 nm), which is respectively 3.5 and 1.8 times higher than using g-C 3 N 4 or Ag 3 PO 4 , alone. This improved performance was attributed to the formation of Z-scheme g-C 3 N 4 /Ag/Ag 3 PO 4 heterojunction , driven by the built-in electric field across the g-C 3 N 4 /Ag/Ag 3 PO 4 interface. These separated the electron-hole but enhanced the original strong oxidation and reduction performance of related components. The superior performance is also attributed to the improved surface area, enhanced hydrophilicity (H 2 O 2 ) and better visible-light-harvesting capability of the composite compound. More importantly, the AP-CN 2:1 sample maintained a NO removal rate of more than 73% even after four rounds of recycling. The photocatalytic oxidation removal mechanism was evaluated using the radical-capture experiments, electron spin resonance (ESR) and ion-exchange high-performance liquid chromatography (HPLC) analysis. The findings of this work offer a simple but effective design of a highly reactive and practical ternary Z-scheme heterojunction photocatalysts for the removal of toxic NO.
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高影响因子
MATERIALS RESEARCH BULLETIN
·
2020
·
IF 4.019
Xinyue Gu,Jie Mei,Jiahao Lai,Siying Lv,Jing Yang,Shihai Cui,Sen Chen
In view of the deterioration of the environment and the shortage of resources, it is necessary to develop efficient photocatalysts for the degradation of organic pollutants. Herein, a novel and environmentally friendly ZnNb 2 O 6 /g-C 3 N 4 heterojunction nanocomposite was synthesized by calcination-hydrothermal method successfully. The chemical and physical capabilities of the material were characterized by various kinds of analytical instruments. Compared with ZnNb 2 O 6 and g-C 3 N 4 , ZnNb 2 O 6 /g-C 3 N 4 showed the strongest photocatalytic activity. The nanomaterial was used in the removal of the pollutant 2,4-DCP. The effects of degradation conditions were discussed including component ratio, material dosage, initial analyte concentration, pH and salinity. After 180 min’ simulated sunlight illumination, the removal efficiency of 2,4-DCP (10 mg/L) reached 95.7% under the optimum condition. Furthermore, the possible photocatalytic mechanisms were discussed according to four aspects: (i) The conformation of the active species; (ii) The calculation of valence and conduction band; (iii) The analysis Z-scheme heterojunction mechanism; (iv) The speculation of feasible photocatalytic paths. In conclusion, the ZnNb 2 O 6 /g-C 3 N 4 (ZC-7) nanocomposite has the least recombination rate of electron-hole pairs and the highest photocatalytic efficiency.
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ChemNanoMat
·
2020
·Vol. 6
·期 3
·470-479
·
IF 3.384
Qingrui Luan,Qifeng Chen,Jie Zheng,Ruifang Guan,Yanfen Fang,Xun Hu
Graphical Powered by the Sun : The formation of 2D-ZnS@ZnO Z-scheme heterostructures and introduction of zinc interstitial defects into ZnO was successfully achieved through a facile in-situ ion-exchange hydrothermal method. The photocatalysts exhibited high photocatalytic activity for hydrogen evolution. Heterostructure and defects in photocatalyst play highly important role in photocatalysis. Formation of 2D-ZnS@ZnO Z-scheme heterostructure and introduction of zinc interstitial defects into ZnO were successfully achieved through a facile in-situ ion-exchange hydrothermal approach, and the photocatalysts exhibited high photocatalytic activity for hydrogen evolution. The heterointerface between the highly ordered ZnO core and disordered ZnS shell, and the zinc interstitial, facilitate the transfer and separation of charge carriers, resulting in high photocatalytic activity. The 2D-ZnS@ZnO photocatalyst with a disordered ZnS layer of about 8 nm in thickness exhibited a photocurrent density about 7.2 times than that of ZnO, which is mainly attributed to the facilitative effect on interface transfer and the increased charge density. In addition, the photocatalytic activity can be adjusted via changing the thickness of the disordered ZnS overlayer. This work provides a strategy for the design of the heterointerface photocatalysts combined with defect engineering, through which the photocatalytic activity can be remarkably improved.
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