CERAMICS INTERNATIONAL
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2024
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IF 5.1
Hang Liu,Junlong Liu,Yanchang Liu,Zhihao Qu,Siye Tian,Yuhong Zhang
In this work, the ZnO microsphere is prepared by hydrothermal method and modified with different concentrations of Eu. The morphology of ZnO:Eu sample shows flower-like microspheres with many nanosheets. The gas performance of ZnO:Eu microsphere is investigated for detecting NO 2 . Compared with pure ZnO, the response of ZnO:2 % Eu sensor is increased by 8 times, and the optimal operating temperature of that is decreased to 130 °C. Especially, the gas sensing properties of ZnO:2 % Eu sensor is enhanced under UV excitation. The recovery time of ZnO:Eu sensor is reduced by 1200 s, and the response is increased by 3.6 times under UV excitation. The above results show an increase in sensor response due to doping Eu and UV excitation. At last, the possible gas mechanism of ZnO:Eu is discussed with and without UV excitation. This finding provides important guidance for UV-assisted sensors to enhance NO 2 response.
研究领域:
材料科学
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环境监测
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2021
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IF 7.086
Linfeng Zhang,Xianghui Wu,Jianding Li
To deal with the environmental pollution and energy crises, it is indispensable to find green and efficient means to overcome these challenges. Herein, the Sn-doped BiOI modified multi-shelled ZnO heterojunction composite with a high performance are designed and prepared. The results prove the formation of heterojunction structure in the composites and the morphology is shown as the multi-shelled microsphere. The performances of the composites are evaluated by different kinds of antibiotic degradation and H 2 -evolution under simulation sunlight irradiation. The measurements present that the Sn -BiOI/ZnO (SBZs) could completely remove ciprofloxacin (CIP) within 100 min, which is 4.18 times that of ZnO in kinetics. Typically, the degradation rate of CIP for SBZ6 is over 99.9%, which is more than 25% higher than that of pure ZnO microspheres. In addition, the rate of H 2 production could reach 3.08 mmol g −1 ∙ h −1 , which is 1.79 times of the pure ZnO microspheres. The boosted performance of the composites may originate from the enhanced electronic transmission efficiency and improved separation and recombination efficiency of electrons/holes. The charge transfer mode in the SBZs heterojunction composites is proposed and verified as the Z-scheme by the active species experimental and the possible electron transfer path analysis. Therefore, Sn -doped BiOI is introduced into multi-shelled ZnO microsphere to form contact heterojunction interfacial, which greatly improves the photocatalytic performances of the SBZs. Furthermore, this work supplies a strategy for designing and preparing highly active ZnO-based heterojunction composites, which could effectively address the challenges of environmental remediation and clean energy production.
研究领域:
环境科学
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材料科学
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能源科学
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DOI
PubMed
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 7
·1124
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IF 5.719
Xiaoqian Ai,Shun Yan,Ligang Ma
The degradation of pollutants in wastewater using abundant resources and renewable energy sources, such as light, is attractive from an environmental perspective. ZnO is a well-known photocatalytic material. Therefore, in this study, a hierarchical ZnO microsphere precursor was prepared using a hydrothermal method. The precursor was subsequently annealed at different temperatures, which enabled the production of a ZnO catalyst having a controllable morphology. Specifically, as the annealing temperature increased, the precursor crystallized into hexagonal wurtzite and the crystallinity also increased. The catalysts were tested for their photocatalytic activity for the degradation of dye molecules (methylene blue and rhodamine B), and the catalyst sample annealed at 400 °C showed the best photocatalytic activity. The origin of this activity was studied using electron paramagnetic resonance spectroscopy and transient photocurrent measurements, and the structure of the optimal catalyst was invested using electron microscopy measurements, which revealed that it was formed of two-dimensional nanosheets having smooth surfaces, forming a 2D cellular network. Thus, we have presented a promising photocatalyst for the mineralization of organic contaminants in wastewater.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 35
·13260-13272
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IF 4.052
Shaojia Song,Kun Wu,Huadong Wu,Jia Guo,Linfeng Zhang
A series of multi-shelled Fe3+/Sn4+-doped ZnO microspheres were synthesized by calcining carbon microspheres as sacrificial templates. The crystal structure, morphology and optical properties of prepared photocatalysts were investigated by X-ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), Scanning Transmission Electron Microscopy (STEM), X-ray Photoelectron Spectroscopy (XPS), UV-Vis absorption spectroscopy (UV-Vis DRS), Photoluminescence (PL) spectroscopy and transient photocurrent techniques. FESEM and STEM images demonstrated that the samples had a multi-shelled structure and the doping elements were uniformly dispersed in the ZnO matrix. DRS and PL spectra and photocurrent measurements show that the Fe/Sn doped-ZnO samples exhibited higher visible absorption and lower recombination rates of photogenerated electron–hole (e−/h+) pairs. These advantages resulted in higher photodegradation efficiency of these catalysts towards methylene blue (MB) and ciprofloxacin (CIP). Moreover, the band structure and density of states of the un-doped ZnO and Fe/Sn-doped ZnO models with three different doping ratios were calculated based on the CASTEP code. The roles of the Fe3+/Sn4+ dopant in the ZnO matrix were found to be band gap control and electron density adjustment due to the Fe(3d) and Sn(5s, 5p) orbitals. This work has a certain reference value for constructing multi-shelled photocatalysts with doping modification and investigating the mechanism of enhanced photoactivity at the microscopic level.
研究领域:
材料科学
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理论计算化学
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环境科学
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DOI
PubMed
高影响因子
Journal of Saudi Chemical Society
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2018
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IF 2.456
Sajid ur Rehman,Jian Liu,Rida Ahmed,Hong Bi
Three-dimensional (3D) ZnO microspheres with the composite of polyaniline (PANI) have been successfully synthesized by one-pot solvothermal and in-suit polymerization method. The obtained microspheres were uniform having the diameter of 4 μm–7 μm. These microspheres, inside cushion of PANI polymer, exhibit excellent microwave absorption properties. Composite of ZnO microspheres with PANI increased the complex permeability and enhanced the dielectric loss. Thus, the microwave absorption properties of the composite have been intensified. Despite the fact that the composite of ZnO with PANI herein dissipate the microwaves by dielectric loss, their performance is admirable compared to most of PANI-based composites reported. The morphological, structural and spectral properties have been investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and the Fourier transform infrared (FT-IR). It is found that the maximum reflection loss value of ZnO@PANI reaches −41 dB at 14 GHz with a thickness of 3.5 mm that is superior to the previously reported composite of PANI with other materials.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Chemosensors
·
2023
·Vol. 11
·期 7
·376
·
IF 4.2
Xiangxiang Fan,Susu Yang,Chun Huang,Yujie Lu,Pan Dai
In this work, ZIF-8-derived Co3O4@ZnO microspheres were prepared by a liquid-phase concentration-controlled nucleation strategy. The results of the material characterization showed that Co3O4@ZnO microspheres were obtained, and the surface structure could be controlled with the concentration of the ligand. Compared with pure Co3O4microspheres, the operating temperature of optimized Co3O4@ZnO microspheres increased by 90 °C after the gas-sensing test. The response to 50 ppm acetone of Co3O4@ZnO microspheres was 4.5 times higher than that of pure Co3O4, and the detection limit reached 0.5 ppm. Meanwhile, Co3O4@ZnO microspheres showed a shorter response-recovery time and better selectivity. The enhanced-sensing mechanism of the ZIF-8-derived Co3O4@ZnO microspheres was also analyzed.Keywords:gas sensor;microspheres;MOF;ZIF-8
研究领域:
材料科学
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化学传感器
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纳米技术
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Mao Feng,Yanli Sun,Lingxuan Wang,Yalun Wu,Shuangshuang Wang,Liangyu Li,Shiwen Wang,Yanxia Wang,Zumin Wang,Yasong Zhao,Feifei You,Danyang Li
Constructing advanced photocatalysts for tetracycline (TC) degradation in aquatic environments is a promising and green strategy to mitigate antibiotic resistance and ecological risks. In this work, the hollow structured ZnO microspheres functionalized with Pt nanoparticles were rationally designed and synthesized through a sacrificial template approach and photodeposition process. The hollow structures strengthened light trapping via multi-scattering in cavity as well as shortened charge migration pathway due to the thinner shell, which facilitated more electron (e − ) and hole (h + ) migration to catalyst surface. Furthermore, the Pt nanoparticles anchored on ZnO surfaces induced localized surface plasmon resonance (LSPR) effect, broadening light absorption in visible light range. Concurrently, the formation of heterojunction between Pt and ZnO significantly suppressed the recombination of e − /h + . Thus, the optimal Pt/ZnO catalyst achieved 90.29 % TC degradation within 100 min, exhibiting a reaction rate constant of 0.02347 min −1 , which was 2.62-fold higher than that of single ZnO. Moreover, the degradation efficiency retained 87.84 % after five successive recycles, demonstrating exceptional durability and stability. This work offers a facile and scalable strategy for fabricating high performance photocatalysts for organic compounds degradation in pollution water with a bright application prospect.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）