JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2022
·
IF 10.319
Meng Dai,Zuoli He,Peng Zhang,Xin Li,Shuguang Wang
The recombination of photogenerated electrons and holes is a crucial factor limiting photocatalytic H 2 evolution. The S-scheme ZnWO 4 -ZnIn 2 S 4 heterojunction with 2D coupling interfaces was successfully synthesized using a simple solvothermal method. An effective S-scheme interfacial charge migration route at the S-scheme heterogeneous interface was determined by energy band structure analyses (such as UPS, Mott-Schottky and XPS plots), which facilitates the separation of photoexcited carriers. It is worth noting that the optimal ZnWO 4 -ZnIn 2 S 4 composite has an H 2 evolution activity of 4925.3 μmol g −1 h −1 with favourable photostability and stability. Meanwhile, the ZnWO 4 -ZnIn 2 S 4 heterojunction exhibits the maximum optical response value (2.8 mA cm −2 ) in the initial stage, effectively promoting the separation and migration of photogenerated carriers. The establishment of the built-in electric field direction at the interface can effectively promote the space charge separation between the ZnWO 4 and ZnIn 2 S 4 nanosheets, which is favorable to the photocatalytic H 2 evolution. This work provides valuable guidance for designing S-scheme heterojunction photocatalysts composed of two n-type semiconductors for energy and environmental applications.
研究领域:
材料科学
·
能源与环境科学
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产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Lina Dai,Xianglan Dong,Enqi Zhang,Yanduo Liu
Against the backdrop of global energy and environmental challenges, research on the photocatalytic conversion of methane to methanol has made significant progress. ZnO photocatalyst, despite its many advantages, suffers from rapid recombination of photogenerated electrons and holes in single ZnO, leading to low charge separation efficiency and thus limiting the solar energy conversion efficiency. The mixed-crystal heterostructure formed by ZnO and ZnWO 4 significantly improves photocatalytic efficiency by effectively separating and utilizing high-energy-level electrons. The conduction band of ZnWO 4 serves as an ideal “bridge” for the high-energy-level electrons generated on ZnO, enabling these electrons to quickly transfer to the conduction band of ZnWO 4 , thus avoiding rapid relaxation and recombination within the conduction band of ZnO. The optimal sample achieved a methanol yield of 72 μmol/g/h, with a total carbonyl compound yield near 100 μmol/g/h, accounting for 97 % of the entire product system. This opens new avenues in the field and provides a model for the development of related composite photocatalysts, offering hope for significant breakthroughs and progress in energy conversion and utilization.
研究领域:
材料科学
·
能源化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Zhiquan Chen,Qingwei Song,Lei Ni,Juncheng Jiang,Yuan Yu
A systematic comparison between batch and continuous microfluidics systems was conducted for the synthesis of ZnWO 4 nanoparticles . A series of ZnWO 4 nanoparticles were prepared by different operating modes, initial concentration of reactants and residence time. The features of ZnWO 4 nanoparticles including microscopic morphology, particle size distribution and chemical structure were systematically characterized. The results showed that the continuous microfluidics system could obtain ZnWO 4 nanoparticles with a more uniform particle size compared with batch system. The size of ZnWO 4 are reduced from 92.6 to 65.2 nm by changing the reaction system. Besides, a low concentration of reactants is more suitable for preparing smaller particles ZnWO 4 nanoparticles. The average diameters of prepared ZnWO 4 nanoparticles was reduced to 50 nm in the condition that the residence time was 20 s and the concentration of reactants was 0.1 mol/L. Afterward, the degradation of dimethyl sulfoxide (DMSO) in the wastewaters was used as a probe reaction to evaluate the catalysis performance of prepared ZnWO 4 nanoparticles. This work indicates the potential opportunity of versatile continuous microfluidics technique for the fabrication of various multifunctional metal tungstates nanoparticles.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2020
·
IF 3.306
Hongbo He,Zhuangzhu Luo,Changlin Yu
Herein, ZnWO 4 nanoparticles (NP S ) with controllable size were synthesized by a facile solvothermal method via changing EG concentration in the solvent. The physicochemical properties of ZnWO 4 NP S were characterized by XRD, TEM, EDS, BET, XPS, UV–vis DRS, PL and photocurrent. The results shown that the EG concentration has a great influence on the morphology, size and crystallinity of ZnWO 4 NP S . On the one hand, the photocatalytic activity of ZnWO 4 -EG62.5 was obviously better than that of ZnWO 4 -EG0 in the removal of hazardous pollutants including Cr 6+ , MB, RhB and MO by 71.4, 33.3, 13.5 and 21.3 %, respectively. Moreover, ZnWO 4 -EG62.5 displayed excellent photocatalytic stability for Cr 6+ reduction. The ZnWO 4 -EG75, on the other hand, exhibited the best antibacterial activity to Bacillus subtilis and Vibrio alginolyticus , and the maximal inhibition zone area of Bacillus subtilis and Vibrio alginolyticus over ZnWO 4 -EG75 was 3.4 and 6.8 times than that of ZnWO 4 -EG0, respectively. Our work indicated that ZnWO 4 NP S presented potential future application in water treatment and marine antifouling, and it is a feasible approach to enhance the photocatalytic and antibacterial performance of semiconductor NPs by controlling its size and crystallinity.
研究领域:
环境科学
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材料科学
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微生物学
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2018
·
IF 5.503
Jiaxiong Liu,Dehua He
ZnWO 4 -ZnO catalysts with different W content were prepared by conventional hydrothermal and wet impregnation methods and applied in the direct synthesis of glycerol carbonate from CO 2 and glycerol. The crystallite structure, texture property, morphology, redox and acid-base properties and the surface chemical situation of the catalysts were characterized by XRD, BET, TEM, H 2 -TPR, NH 3 /CO 2 -TPD and XPS. The possible activation routes of CO 2 and glycerol were analyzed with DRIFTS and FTIR. ZnWO 4 -ZnO composite catalysts showed better catalytic performances with respect to ZnO in the carbonylation of glycerol with CO 2 . The improved activity of ZnWO 4 -ZnO catalysts was associated with the formation of ZnWO 4 , the interaction between ZnWO 4 and ZnO, and the enhanced moderate acidic property. DIRFTS results showed that chelating bidentate carbonate species was the main adsorption pattern for CO 2 on ZnO, while the introduction of W led to the bridged bidentate carbonate, which became the main adsorption pattern on ZnWO 4 -ZnO. As for the activation of glycerol, zinc glycerolate played an important role in the reaction process. Based on the reaction and characterization results, a plausible reaction route involved a seven-membered ring esters intermediate was suggested for the reaction of CO 2 and glycerol over ZnWO 4 -ZnO catalysts.
研究领域:
催化化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Current Nanoscience
·
2015
·Vol. 11
·期 2
·198-205
·
IF 1.096
Yang Rong Yao,Rong Bin Huang,Huan Zhou,Wan Zhen Huang,Yong Zhang,Xu Chun Song
The ZnWO4 photocatalysts doped with different molar ratios of molybdenum ions have been successfully prepared by a facile and effective hydrothermal method. The photocatalytic activities of the as-prepared products were evaluated by the degradation of rhodamine B (RhB) in aqueous solution. The result showed that with the doping of molybdenum ions, the photocatalytic activity of the Mo-doped ZnWO4 photocatalysts were greatly improved. In addition, the best photoactivity was acquired when the Mo-doping molar ratio is 0.05. The doping effects on the properties of ZnWO4 nanoparticles such as particle size, specific surface area, band gap and the photocatalytic performance were systematically discussed.
研究领域:
材料科学
·
纳米科技
·
光催化
·
环境功能材料
·
无机合成
✓ 已验证
DOI
高影响因子
Current Nanoscience
·
2015
·Vol. 11
·期 3
·360-365
·
IF 1.096
Cui Xia,Huang Wan Z.,Zhou Huan,Yin Hao Yong,Zheng Yi Fan,Song Xu Chun
In this study, a novel ZnS/ZnWO4 nanocomposite photocatalyst was synthesized through a facile hydrothermal synthesis method. The as-prepared samples were characterized by energy dispersive X-ray analysis (EDS), X-ray powder diffraction (XRD), transmission electron microscopy
(TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS) and so on. The ZnS/ZnWO4 nanocomposite shows an enhanced photocatalytic activity for the degradation of rhodamine B (RhB) under simulated solar light. The results show that ZnS/ZnWO4 nanocomposite photocatalysts
have better photocatalytic activity than the single ZnWO4 or ZnS. In the case of ZnS compounding, ZnS/ZnWO4 photocatalyst led to the lower recombination ratios of photo-generated electron hole pairs and then higher photocatalytic performance. In addition, it has the potential
to become a useful technology for environmental cleanup without secondary pollution.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yilin Wang,Chenxi Wang,Li Zhang,Jiaodi Li,Rongjie Li,Qian Fu,Chunyan Li,Pengcheng Zhao,Yixi Xie,Junjie Fei
Kaempferol (KA), an important polyphenolic compound, is able to combat a variety of inflammatory diseases. Here, a ZnWO 4 / porous nanocarbon based electrochemical sensor has been constructed to detect KA for the first time. Innovatively, ZnWO 4 has been synthesized by pyrolysis using ZIF-8 as a zinc source, while porous nanocarbon was introduced. The nanocomposites have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy and demonstrated that Acidified ZnWO 4 /porous nanocarbon has been successfully prepared. Notably, the excellent catalytic properties of ZnWO 4 and the great enrichment ability and conductivity of porous nanocarbon greatly enhanced the detection performance of the sensor for KA with a linear range of 0.009–0.7 μM and a LOD of 2.03 nM. In addition, the sensor has obtained satisfactory results for the detection of KA in actual natural samples (broccoli and kaempferia powder). The reaction sites and redox mechanism of KA were shown by density functional theory. Finally, the sensor is highly sensitive and stable, making it a novel detection method with extremely high potential applications.
研究领域:
分析化学
·
材料科学
·
生物医学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Zhiming Li,Zhiqiang Wei,Meijie Ding,Qingsong Yu,Jinglong Bai,Huining Zhang
Problems such as bacterial resistance caused by tetracycline antibiotics pose a serious threat to human production and life and ecosystems. We prepared ZnFe2O4@ZnWO4 heterojunction nanocomposites using hydrothermal and coprecipitation methods. The micromorphology, structure, and photoelectrochemical properties were analyzed. In combination with the presence of H2O2, the photo-Fenton activity of the antibiotic tetracycline at high concentration was tested under visible light irradiation, and its catalytic mechanism was investigated. The results showed that the composition of the composite heterojunction improved the catalytic activity of the catalyst. At a pollutant concentration of 50 mg L–1 and pH 5, 30% ZnWO4/ZnFe2O4 degraded 92.1% of tetracycline in 60 min with a degradation rate of 0.0295 min–1, which was 6.7 times higher than that of pure ZnFe2O4. The results of free radical trapping experiments and electron spin resonance techniques indicated that hydroxyl radical (•OH) and superoxide radical (O2–) played important roles in the photo-Fenton degradation of tetracycline. Notably, the catalyst maintained a high degradation rate (80%) after five cycles. ZnFe2O4 introduced in this article may provide a promising strategy for achieving strong light absorption and is authoritative in meeting future environmental requirements.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2016
·
IF 4.179
Pengwei Huo,Yanfeng Tang,Mingjun Zhou,Jinze Li,Zhefei Ye,Changchang Ma,Longbao Yu,Yongsheng Yan
ZnWO 4 -CdS heterostructure photocatalysts have been successfully synthesized by hydrothermal method with assembling CdS on the surface of ZnWO 4 . The obtained composite photocatalysts were characterized by X-ray diffraction, transmission electron microscopy, Raman, thermo-gravimetric analysis, UV–vis diffuse reflectance spectroscopy, photoluminescence and photocurrent measurement. The results show that the interface between ZnWO 4 and CdS is well formed, and the CdS nanoparticles are uniformly distributed onto ZnWO 4 nanorods which could facilitate charge transfer and reduce recombination of photo-generated electrons and holes. Compared with pure ZnWO 4 and CdS, the as-prepared heterostructure photocatalysts exhibit excellent photostability and photodegradation ability of ciprofloxacin (CIP) under visible light irradiation.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jialin Niu,Yulong Xiang,Xiaoli Dong,Yu Wang,Nan Zheng,Pei Yu
Hexavalent chromium in industrial wastewater poses a serious threat to ecosystems. Photocatalytic technology has been seen as a promising strategy for removing heavy metal ions. Construction of heterostructures offered a promising strategy to enhance the separation efficiency of photogenerated carriers, thereby improving photocatalytic performance. Herein, ZnWO 4 /UiO-66-NH 2 heterostructures were synthesized by a two-step hydrothermal method. The synthesized samples were systematically characterized via a variety of techniques, alongside an exploration of the associated photocatalytic mechanism. ZnWO 4 /UiO-66-NH 2 -2 exhibited an exceptional photocatalytic performance, attaining a 97 % degradation of hexavalent chromium within 60 min, approximately 1.3 and 4.7 times that of UiO-66-NH 2 and ZnWO 4 , respectively. The transient photocurrent response, photoluminescence (PL), and electrochemical impedance spectroscopy (EIS) results indicate that constructing heterostructures can effectively accelerate the migration of electrons while simultaneously suppressing the recombination process of photogenerated carriers. In addition, Active species trapping experiments revealed that the photogenerated electrons were the main active substances in photoreduction reaction. This study offers an effective strategy for photocatalytic reduction of hexavalent chromium.
✓ 已验证
产品关联
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Chenglin Zhang,Jiangpeng Li,Qiuchen He,Ziming Zhao,Wenjun Jiang,Su Zhan,Feng Zhou
Deactivating the concentration of marine microorganisms is suitable and proper for ballast water treatment. In here, a promising strategy has been presented to create massive oxygen vacancies synergistic with metallic Bi nanoparticles on ZnWO4 for inactivating marine bacteria in seawater, demonstrating that the paramount incorporation of metallic Bi nanoparticles and 2BZWO (Bi/ZnWO4) samples exhibits superior photocatalytic sterilization, in which the sterilization efficiency of 2BZWO is 2.83 times that of pure ZnWO4. The co-incorporation of metallic Bi nanoparticles and oxygen vacancies significantly enhanced the absorption of visible light and enrichment of the photogenerated electrons, promoting the separation of charge carriers. Moreover, first-principles calculations demonstrate that the coeffect of metallic Bi nanoparticles and oxygen vacancies guided the reconfiguration of the active sites and electrons flowing direction. Results from this study provide a creative strategy on controllable Bi/ZnWO4 synthesis to manipulate the photocatalytic inactivation of marine bacteria.
研究领域:
环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
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