FUEL
·
2022
·
IF 8.035
Yihua Yue,Zhongliang Huang,Dongren Cai,Shafqat Ullah,Abdul-Rauf Ibrahim,Xin Yang,Jiale Huang,Guowu Zhan
Controlled fabrication of spatial positions of different active sites on catalyst structures is critical to exploring the reaction mechanisms for CO 2 hydrogenation. Herein, two isomorphous zeolitic imidazolate frameworks (ZIF-67 and ZIF-8) were used as sacrificial templates to synthesize multi-layered Co 3 O 4 /ZnO catalysts with tunable core-shell structures and well-controlled spatial positions. The multi-layered catalysts were then evaluated for the catalytic performance for CO 2 hydrogenation. A series of characterization techniques were applied to investigate the morphology and structure of the Co 3 O 4 /ZnO composites with different spatial locations. Due to the unique multi-layered structure, the distinct interfacial structures, and the synergistic effects, the resultant core-shell structured Co 3 O 4 /ZnO nanocatalysts exhibited significantly enhanced activity as compared to their monometallic counterparts (pure Co 3 O 4 and ZnO). In addition, the ZnO@Co 3 O 4 with Co 3 O 4 as shell showed significantly higher CO 2 conversion (25%) than that of Co 3 O 4 @ZnO with ZnO as shell (0.82%). Furthermore, in-situ Diffuse Reflection Fourier Transform Infrared Spectroscopy (DRIFTS) analysis suggested that formate (HCOO*) and methoxy (CH 3 O*) species were the crucial intermediates in the CO 2 hydrogenation over the Co 3 O 4 /ZnO composite nanocatalysts. However, pure ZnO could not activate the CO 2 ; consequently, the use of the Co 3 O 4 /ZnO nanocatalysts derived from multiple-layered ZIFs structures provides new insights into improving the catalytic efficiency of CO 2 hydrogenation.
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2014
·
IF 1.332
Yan Wang,Yaofeng Zhu,Xiang Fu,Yaqin Fu
A novel sound insulation composite was successfully fabricated by modifying glass fiber fabric with tetrapod ZnO whisker (TW-ZnO)/SiO2-compounded shear thickening fluid (STF). The rheological properties of the compounded STF were evaluated using a high-speed rotational rheometer. The microstructure and sound-insulating properties of the STF-treated glass fiber fabric (STF-fabric) were characterized using a scanning electron microscope and a two-channel acoustic analyzer, respectively. The shear thickening effect of TW-ZnO/SiO2-compounded STF can be better than that of SiO2-monodispersed STF. The sound insulation performance of the STF-fabric, which was superior to that of the original fabric, was related to the fabric weaving structure and shear thickening effect of the compounded STF.
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Wen Cui,Xiaoli Kang,Xiaoying Zhang,Xudong Cui
A highly efficient Rhodamine B (RhB) adsorbent based on a gel-like ZnO/Zr-metal-organic framework (ZnO/Zr-MOF) composite was prepared by reacting ZnO nanoparticles with glacial-acetic-acid-modulated Zr-MOF(bpy) via a sample solvothermal method. Introduction of ZnO greatly improved the texture properties of the parent Zr-MOF(bpy), and the resulting material exhibited an agglomerate morphology consisting of numerous quadrate nanoparticles, which is quite different from the cubo-polyhedron morphology of Zr-MOF(bpy). In this way, this composite showed a considerable RhB absorption capacity from aqueous solution in a wide pH range. The adsorption kinetics , isotherms and thermodynamics of the RhB adsorption by ZnO/Zr-MOF(bpy) were discussed and confirmed that this adsorption process satisfied pseudo-second-order kinetics and the Langmuir model, and was a spontaneous exothermic process. Moreover, the excellent adsorption performance is likely related to the synergism of hydrogen bonding , electrostatic interactions and π–π interactions between the ZnO/Zr-MOF(bpy) nanocomposite and RhB. The excellent texture properties of ZnO/Zr-MOF(bpy) promote the adsorption and diffusion of RhB on it, which is also crucial during the adsorption process.
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高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2018
·
IF 2.593
Pengfei Hu,Changchun Chen,Jiawei Song,Zhonghai Tang
Specific surface area of photocatalyst usually has an important influence on its photocatalytic performance. Herein, mesoporous ZnFe 2 O 4 /ZnO nanocomposites were successfully fabricated by facile calcination methods using ZnFe 2 O 4 /ZIF-8 as the precursor. The structure, morphology, optical and adsorption properties of the as-prepared samples were detailedly characterized, and photocatalytic performances of these samples were mainly evaluated by the degradation of Rhodamine B (RhB) under visible light irradiation (λ > 400 nm). The results demonstrated that the ZnFe 2 O 4 /ZnO hybrids are of enhanced visible-light photocatalytic performances among all the samples, indicating that the heterojunction structure between ZnFe 2 O 4 and ZnO efficiently inhibited the the recombination of photogenerated electron-hole pairs. Wherein, the ZFO/C6A4 sample prepared via two-step calcination method (600 °C in Ar and then 400 °C in air ambient) possessed higher visible light photocatalytic activity than the ZFO/A6 sample prepared via one-step calcination (600 °C in air ambient). This phenomenon was probably ascribed to the lager pore volume and average pore size of ZFO/C6A4 sample. Moreover, the potential carbon doping in ZnO particles during two-step calcination process was inferred by the XRD analysis , which further facilitated the separation of photogenerated electron-hole pairs in the ZFO/C6A4 sample. On the other hand, the composite sample also exhibited good magnetic recovery property and photochemical stability. These results indicated that the ZnFe 2 O 4 /ZnO nanocomposite prepared via two-step calcination method would be quite promising for the degradation of organic pollutants.
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ANALYST
·
2021
·Vol. 146
·期 14
·4595-4604
·
IF 4.616
Jiarui Yu,Jingyu Lin,Jianping Li
A new photoelectrochemical enzyme biosensor based on an extended-gate field-effect transistor (EGFET) was constructed for the highly sensitive detection of glyphosate based on the inhibition of acetylcholinesterase (AChE) activity by glyphosate. First, a two-step hydrothermal method was used to introduce ZnO and CdS onto an activated indium tin oxide (ITO) electrode to prepare a CdS/ZnO/ITO electrode. Then, AChE was immobilized on CdS/ZnO/ITO with chitosan to obtain an AChE/CdS/ZnO EGFET sensor. Under optimal experimental conditions, the logarithmic value of glyphosate in the range of 1.0 × 10−15–1.0 × 10−11 mol L−1 exhibited a good linear relationship with the photo-drain current response. The detection limit was 3.8 × 10−16 mol L−1 (signal-to-noise ratio = 3). The results show that the AChE/CdS/ZnO EGFET sensor has extremely high sensitivity and good selectivity. Moreover, the sensor was used for the determination of glyphosate in vegetables, demonstrating its application for the real-time detection of samples.
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PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Tao Du,Jiyao Cui,Jinghao Li,Hairui Bai
Tb 3+ ions were pre-introduced into ZnO to synthesize ZTb phosphors, which were subsequently compounded with MnO 2 -Co 2 O 3 -Sb 2 O 3 -SiO 2 - x Bi 2 O 3 (MCSS- x B) to prepare dual-functional varistor ceramics. The effects of Bi 2 O 3 content on the microstructural, nonlinear electrical, and photoluminescence properties of the ZTb-MCSS- x B varistor ceramics were systematically investigated. Results show that the presynthesized ZTb phosphors exhibit efficient host-sensitized nonradiative energy transfer from the ZnO matrix to Tb 3+ ions. Driven by lattice distortion and charge compensation, hybrid defect clusters form, producing, a broadband emission centered at 540 nm. Upon sintering with MCSS- x B, the microstructure and double Schottky barrier characteristics of the varistor ceramics are significantly modulated. At an optimal Bi 2 O 3 content of 0.9 mol%, the ceramic exhibits a dense microstructure with an average grain size of 3.26 μm, a maximum barrier height of 1.58 eV, a high nonlinear coefficient of 70.2, and a low leakage current density of 8.95 μA/cm 2 . Importantly, the continuous Bi-rich liquid phase relieves lattice strain and decouples Tb-defect clusters, resulting in energy reconfiguration from the broadband luminescence of the ZTb phosphor to transition-metal-activated sharp emissions, characterized by an intense red emission at 750 nm and a near-infrared emission at 828 nm originating from Mn 4+ ions and Mn 4+ - V O defect complexes, respectively. These findings demonstrate a feasible strategy for simultaneously achieving superior nonlinear electrical performance and multicenter photoluminescence in ZnO-Bi 2 O 3 -based varistors.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Mingyuan Li,Huiwei Du,Lun Hong,Jingji Zhang,Jiangying Wang,Quan Zong,Zejie Zhu,Xianhe Meng,Tao Hong
The application of ZnO with high theoretical specific capacity as anode material for lithium-ion batteries is severely limited due to volume expansion during continuous cycling, slow lithium-ion diffusion, and poor conductivity. Here, ZnO nanoparticles were wrapped in N-doped multilayer graphene (ZnO@C) by chemical vapor deposition to improve specific capacity, rate performance, cycle stability, and conductivity. The thickness of the graphene layer and filling rate of ZnO in yolk-shell structure were investigated for the best electrochemical performance. The ZnO@C of yolk-shell structure with filling rate of 28% has a reversible specific capacity of 390 mAh/g after 200 cycles at 0.25 A/g, and achieves a capacity of 204.6 mAh/g at a high current of 1 A/g. The results show that N-doped porous graphene coated ZnO yolk-shell structure composites with etching treatment have good rate performance and cycle stability. The performance of electronic conductivity and lithium-ion diffusion is greatly improved, and the pseudocapacitive effect in the lithium storage mechanism is enhanced.
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高影响因子
Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 3
·1-8
·
IF 1.961
Sun Jianzhang,Gao Baoyu,Luo Yuanxia,Xue Moxi,Xu Xing,Yue Qinyan,Wang Yan
Enteromorpha polysaccharide (Ep) extracted from alga a novel green coagulant aid for nanoparticles (NPs) and heavy metal ions removal and the structure of EP was intensively studied in this study. The integration of Ep with polyaluminum chloride (PAC-Ep) coagulants exhibited higher coagulation performance than that of the polyaluminum chloride (PAC) because of the negatively charged NPs suspension and humic aid (HA) solution. Significant high removal efficiencies of dissolved organic matter (94.1%), turbidity (99.3%) and Zn ions (69.3%) were achieved by the PAC-Ep coagulants. The dual-coagulation properties of PAC-Ep for different pollutants was based on multiple mechanisms, including (i) Al 3+ charge neutralization; (ii) hydroxy aluminum hydroxyl bridging formed polynuclearhydroxy complexes bridge and sweep colloidal particles; (iii) adsorption and bridging of Ep chain for the NPs and heavy metal ions. Results indicated that the destabilization of colloid was induced by the coexisting HA and higher removal was achieved as ions adsorption was enhance in the presence of HA complexation. On the basis of that, the extraction of polysaccharide is a promising candidate for its high coagulation performance in water treatment.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yanhu Han,Zhaowei Jia,Wenxue Gong,Xuechun Wei,Yu Zhang,Mengying Tao,Yaofei Ren,Zuyi Lu,Yutong Wu,Jianhua Chen,Zhongfeng Shi,Zhenxia Zhao,Zhongxing Zhao
Developing photocatalysts with high activity and selectivity remains a significant challenge in the field of CO 2 photoreduction for producing valuable chemical or fuel products under mild conditions. Herein, photonic crystal (PC) GDY-Cu/ZnO was constructed through the in-situ induced growth of graphdiyne (GDY) on PC Cu/ZnO surface via H 2 -reduction for efficient photoreduction of CO 2 to CH 4 . With the aid of photonic crystal structure, PC GDY-Cu/ZnO exhibits a distinctive red-edge slow light region which can significantly improve the utilization efficiency of visible light and intensify photo-catalysis. Additionally, the formed all-solid-state Z-scheme system efficiently accelerates photoelectron migration, facilitating e - /h + separation. Thirdly, the surface GDY, along with the enrich oxygen vacancies generated during H 2 reduction, enhances the adsorption and activation toward CO 2 and H 2 O on PC GDY-Cu/ZnO interface. In consequence, PC GDY-Cu/ZnO demonstrates highly photocatalytic conversion of CO 2 to CH 4 , achieving a CH 4 yield of 33.67 μmol·g −1 ·h −1 with 93.3 % selectivity via slow-light-driven photocatalysis CO 2 reduction. This work provides an efficient strategy to modify ZnO for the efficient photoreduction of CO 2 to CH 4 .
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高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Jie Zheng,Zihui Qin,Shiping Wu,Jinxian Zhao,Jun Ren
A series of ZnO nanostructures with different morphologies were prepared with hydrothermal synthesis method by adjusting the NaOH/Zn 2+ molar ratio. The Au/ZnO catalysts were further synthesized and investigated in the oxidative esterification of ethylene glycol (EG) in methanol to methyl glycolate (MG). As compared with prismatic Au/ZnO(2.0) and fusiform-shaped Au/ZnO(8.0), the flaky-shaped Au/ZnO(3.5) catalyst shows a significantly decreased Au particle size of 3.4 nm as well as superior catalytic performance with the EG conversion of 94.5 % and the selectivity of 91.8 % towards MG. The characterization results imply that the reaction undergoes three successive steps including glycol oxidation (the rate-determining step), nucleophilic addition of glycolaldehyde with methanol and oxidative dehydrogenation of hemiacetal. The small Au nanoparticles and abundant defective surface oxygen species (O V ) promote the generation of activated oxygen species (O δ- ), which facilitate the cleavage of C-H bonds in alkoxide intermediate methylene (–CH 2 ) as well as hemiacetal aldehyde groups (–CHO) and thereby boost the formation of MG. Moreover, base sites adsorbed the alcohol to facilitate the O-H bond cleavage and acid sites adsorbed hemiacetal or intermediate alkoxide to drive the reaction. The strong interaction at the Au-ZnO interface affords the superior catalytic performance of Au/ZnO(3.5) in the oxidative esterification of EG in methanol to MG.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2024
·
IF 3.9
Long Ke,Cui Yixin,Meng Huibiao,Zhang Qi,Liu Yaqing,Shao Linjun,Xing Guiying
In this study, uniform Zn 2+ incorporated chitosan nanofibers were first prepared by electrospinning with PEO as the cospinning agent and ZnO as the Zn 2+ source. Then, these composite nanofibers were carbonized at 600 o C under argon atmosphere to achieve ZnO embedded carbon (Zn@C) nanofibers. Afterward, these ZnO@C nanofibers were annealed at 400 o C under air atmosphere to prepare ZnO nanofibers. SEM, XPS and TEM results confirmed the successful preparation of ZnO nanofibers. The BET analysis shows that the surface area of ZnO nanofibers was up to 154.5 m 2 /g. These ZnO nanofibers exhibited excellent adsorption performance for Congo red with adsorption capacity of up to 224.2 mg/g. After adsorption, the ZnO nanofibers could be readily recovered by removal of the solution and regenerated by calcination at 400 o C for 1.0 h. Due to the fusion of ZnO nanofiber in the regeneration process, the adsorption capacity of ZnO nanofiber was a little reduced after regeneration. The ZnO nanofiber could be reused three times with satisfied adsorption capacity.
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MOLECULES
·
2025
·Vol. 30
·期 3
·466
·
IF 4.6
Xianlu Lei,Shuang Li,Jian Zeng,Meiqi Huang,Miaomiao Ma,Xueyan Ran,Xiang Chen,Yuting Yin,Qi Sun,Tao Le
Zinc oxide (ZnO) semiconductors are renowned for their cost-effective synthesis and superior catalytic attributes, making them prominent in environmental remediation applications. This study presents the synthesis of ZnO nanoparticles (NPs) with distinct morphologies, achieved by modulating citric acid concentrations in an ultrasonic-assisted hydrothermal process. The photocatalytic efficacy of these ZnO NPs in degrading malachite green (MG), a persistent environmental pollutant, was thoroughly investigated. Our findings reveal a strong correlation between the morphological features of ZnO catalysts and their photodegradation performance. Among the synthesized NPs, the chrysanthemum-shaped ZnO (denoted as USZ-0.1) demonstrated exceptional photocatalytic activity, attributed to its enhanced surface area and optimized nano-crystal aggregation. This structure facilitated the generation of a higher concentration of reactive oxygen species, leading to over 96.5% degradation of MG within 40 min under simulated sunlight in an acidic medium. This study underscores the potential of morphological manipulation in enhancing the photocatalytic properties of ZnO NPs for environmental applications.
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PubMed
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