Catalysts
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2022
·Vol. 12
·期 10
·1250
·
IF 4.501
Lei Zhao,Tingting Yu,Bing Yang,Huilin Guo,Lifen Liu,Jinlong Zhang,Changfei Gao,Tao Yang,Mingyan Wang,Yu Zhang
Unlike many studies on the preparation of Z-scheme heterojunctions by doping precious metals, in this paper we first prepared a core-shell material obtained by C doping in ZnO and then composite with MnO2to form a heterojunction; that is, a low-cost and highly catalytic ternary composite catalyst was prepared by a simple hydrothermal reaction. Meanwhile, a large amount of experimental data have enabled the heterostructure type as well as the mechanism of photocatalytic performance to be fully demonstrated. It is proven that C as an intermediate medium achieves electron transport while making up the deficiency of ZnO, and constitutes an all-solid state Z-scheme heterojunction, which enables the rapid transfer of photogenerated electron pairs and visible light irradiation to the stream to improve the photocatalytic performance of the composite photocatalyst. In terms of examination of degradation performance, this catalyst showed a high photodegradation rate of tetracycline hydrochloride (TC) of 92.6% within 60 min, and the surface ZnO-C/MnO2catalysts also showed good degradation effect on practical petrochemical wastewater in CODcr degradation experiments.Keywords:ZnO-C/MnO2;Z-scheme heterojunction;wastewater purification;mechanism exploring
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2014
·Vol. 39
·期 3
·1852-1857
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IF 3.159
Jinjuan Xue,Shuaishuai Ma,Yuming Zhou,Zewu Zhang
This manuscript presents a facile route for the preparation of ZnO–C nanocomposites using zinc citrate dihydrate as a precursor through one-step calcination under a nitrogen atmosphere. The products were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), Raman spectroscopy and ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS). The results showed ZnO nanoparticles, 5–10 nm in size, were distributed on the carbonaceous layers to form the ZnO–C nanocomposites. The as-prepared ZnO–C nanocomposites exhibited enhanced photocatalytic activity compared to pure ZnO with respect to methylene blue (MB) degradation under UV irradiation, which was attributed to the improved separation of photogenerated electrons and holes in the presence of carbonaceous layers. In particular, the rate of degradation of methylene blue (MB) with ZnO–C(550N) as a photocatalyst was 4.15 times faster than that of using bare ZnO nanoparticles. Furthermore, the ZnO–C nanocomposites could be easily recycled without an obvious decrease in photocatalytic activity. The resulting ZnO–C nanocomposites have potential applications in photocatalysis and environmental protection.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Linyun Zhang,Shanxin Li,Xuzhou Jiang,Hongying Yu,Yijing Sun
Carbonaceous materials have great prospects in microwave absorption due to their lightweight and corrosion resistance. However, their high conductivity leads to poor impedance matching, posing a significant challenge for obtaining outstanding microwave absorption (MA) materials from carbonaceous materials. In this work, the core-shell ZnO/C nanorods (ZCNs) are prepared by covering conductive carbon on the surface of ZnO nanorods through a simple stirring process in ambient temperature and calcination treatment. The thickness of carbon shell is carefully regulated to realize appropriate impedance matching and strong microwave dissipation capability. ZCN with 30.2 nm of carbon shell achieves outstanding microwave absorption in low frequency and broadband microwave absorption because of the synergies of optimized impedance matching and enhanced dielectric loss: the reflection loss of 49.9 dB at 6.32 GHz, and the effective absorption bandwidth of 6.4 GHz at a corresponding thickness of 2.0 mm. RCS simulation results have verified its excellent performance in practical application. This study proposes a simple and effective idea for the efficient utilization of carbonaceous materials in microwave absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Hua Chai,Chunyan Yang,Peng Xu,Peng Wang,Jianhua Qu,Guangshan Zhang
Heterojunction photocatalysts Fe 2 O 3 –ZnO@C/g-C 3 N 4 (FZCCN) were prepared by precipitation and calcination in this study. Systematic characterization demonstrated that the tight interfacial contact was established between Fe 2 O 3 –ZnO@C and g-C 3 N 4 , and the FZCCN-4 (theoretical mass ratios of ZnO and g-C 3 N 4 was 4) had large BET surface area (110.136 m 2 g −1 ). Bisphenol A (BPA) was selected to estimate the photocatalytic properties of FZCCN and the degradation reaction kinetics was analyzed at the same time. The results showed that, FZCCN-4 had the highest removal rate of BPA (100%, 60 min). The degradation rate of BPA by using FZCCN-4 was approximately 32 and 130 times higher than that of g-C 3 N 4 and Fe 2 O 3 –ZnO@C, respectively. ·O 2 − was proved to be the main active species by capture experiment and electron spin resonance. The UV–vis and PL results proved the formation of heterojunction in FZCCN. This study also identified the intermediates of BPA degradation and tested their toxicity. The excellent visible light catalytic performance of Fe 2 O 3 –ZnO@C/g-C 3 N 4 makes it an ideal material for degrading contaminants.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Yapeng Li,Qinghong Pan,Huiting Shi,Youyou Du,Ailing Yang,Da-Peng Yang
The quantitative determination of cholesterol in foods, drugs, and biological fluids holds significant importance due to its potential health risks. Herein, a self-powered photoelectrochemical (PEC) sensor was developed for cholesterol detection. The photoelectrochemical system was constructed by modifying fluorine-doped tin oxide (FTO) electrodes with ZnO/C (serving as the photoanode) and iron-modified CuBi 2 O 4 (denoted as CBFO, functioning as the photocathode) through a controlled deposition process. To enhance detection selectivity, molecularly imprinted polymers (MIPs) were electrodeposited on the photocathode surface. The optimized sensor exhibited a linear detection range of 1–1000 nmol L −1 and a detection limit of 0.26 nmol L −1 (S/N = 3). Practical application of the sensor for cholesterol detection in milk samples demonstrated satisfactory recovery rates (98.6 %–107 %) with relative standard deviations (RSD) ranging from 2.38 % to 4.25 %. These results underscore the potential of this self-powered PEC sensor as a robust platform for rapid and accurate cholesterol determination in food products, pharmaceuticals, and environmental samples.
研究领域:
分析化学
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生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangyu Gan,Zhenpeng Li,Qingrong Yao,Shasha Jiang,Xiaochang Yu,Jianqiu Deng,Zhao Lu,Lichun Cheng,Maomi Zhao,Huaiying Zhou
Polarization loss and conduction loss are the important attenuation mechanisms in dielectric loss dominant electromagnetic wave (EMW) absorbers, but their synergistic effects in different frequency bands need to be further investigated. In this study, FeNi/ZnO/C/Ni 3 ZnC 0.7 composites (FNZC) were synthesized using a simple and environmentally friendly template-sacrificing method, with water as the only solvent. By varying the elemental addition, the phase and microstructure of the final product can be controlled, which in turn affects the conduction loss and polarization loss, thus altering the EMW absorption performance. The minimum reflection loss (RL) value and EAB of the optimized FNZC composite are –49.23 dB and 5.48 GHz (12.32–18.00 GHz), respectively, covering 99.9 % of the Ku band. Additionally, the RLmin values in the S, C, and X bands are below –17 dB. Based on the component regulation strategy and the analysis of electromagnetic parameters, Cole-Cole curves, and EMW absorption performance, it can be concluded that conduction loss is the primary factor contributing to strong absorption of low-frequency EMW. In contrast, interfacial polarization and defect-induced polarization are the main factors for strong absorption of medium- and high-frequency EMW.
研究领域:
材料科学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiaofang Chen,Yimin Chen,Lingyu Zhang,Zhihua Liu,Enhui Qiu,Qiaoling Liu,Michelle D. Regulacio,Chang Lin,Da-Peng Yang
Owing to the numerous potential applications of ZnO nanomaterials , the development of ZnO-based nanocomposites has become of great scientific interest in various fields. In this paper, we are reporting the fabrication of a series of ZnO/C nanocomposites through a simple “one-pot” calcination method under three different temperatures, 500 ℃, 600 ℃, and 700 ℃, with samples labeled as ZnO/C-500, -600, and -700, respectively. All samples exhibited adsorption capabilities and photon-activated catalytic and antibacterial properties, with the ZnO/C-700 sample showing superior performance among the three. The carbonaceous material in ZnO/C is key to expanding the optical absorption range and improving the charge separation efficiency of ZnO. The remarkable adsorption property of the ZnO/C-700 sample was demonstrated using Congo red dye, and is credited to its good hydrophilicity . It was also found to exhibit the most notable photocatalysis effect due to its high charge transfer efficiency. The hydrophilic ZnO/C-700 sample was also examined for antibacterial effects both in vitro (against Escherichia coli and Staphylococcus aureus ) and in vivo (against MSRA-infected rat wound model), and it was observed to exhibit synergistic killing performance under visible-light irradiation. A possible cleaning mechanism is proposed on the basis of our experimental results. Overall, this work presents a facile way of synthesizing ZnO/C nanocomposites with outstanding adsorption, photocatalysis, and antibacterial properties for the efficient treatment of organic and bacterial contaminants in wastewater.
研究领域:
材料科学
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环境科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2024
·
IF 9.4
Qinghong Pan,Huafang Zhang,Qiaoling Liu,Donghong Huang,Da-Peng Yang,Tianjia Jiang,Shuyang Sun,Xiangrong Chen
ABSTRACT Quantitative determination of tetracycline (TC) in environment and foods is of great importance, as excessive residues might have negative effects on human health and environmental risks. Herein, a self-powered molecularly imprinted photoelectrochemical (PEC) sensor based on the ZnO/C photoanode and the Fe-doped CuBi 2 O 4 (CBFO) photocathode is developed for the sensitive detection of TC. The photocathodic current can be amplified by the efficient electron transfer caused by the Fermi energy level gap between the photoanode and photocathode. Furthermore, molecularly imprinted polymers (MIPs) at photocathode can selectivity identify the TC templates and thus improve the specificity. Under the optimal conditions, the sensor has a linear range of 10 ‒2 -1.0 × 10 5 nmol/L, and a limit of detection (LOD) of 0.007 nmol/L (S/N = 3). More crucially, the milk sample detection is carried out using the as-prepared sensor, and the outcome is satisfactory. The research gives us a novel sensing platform for quick and accurate antibiotic (like TC) in environment and food monitoring.
研究领域:
环境科学
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食品科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2016
·Vol. 24
·期 3
·613-620
·
IF 1.385
Fu Yuanyuan,Zhong Baoying,Chen Yaqin,Song Yonggui,Zhou Rihui,Song Yonghai,Chen Shouhui
A novel porous spherical ZnO@carbon (C) nanocomposite based on zeolitic imidazolate frameworks (ZIFs-8)-directed method was prepared for lithium-ion batteries (LIBs). In this strategy, spherical ZnO nanoparticles were firstly prepared, then 2-methylimidazolate and Zn 2+ were added alternately under ultrasound to fabricate ZnO@ZIF-8. Finally, the novel porous spherical ZnO@C nanocomposites were obtained via pyrolyzing the corresponding ZnO@ZIF-8. The novel porous spherical ZnO@C nanocomposites were characterized with different analysis techniques such as scanning electron microscopy, transmission electron microscopy and X-ray powder diffraction. The resulted spherical ZnO@C nanocomposites exhibited a high reversible capacity of 932 mA h g −1 at 0.1 A g −1 after 100 cycles, which is much higher than that of the pure ZnO nanoparticles. The porous structure, high specific surface area and good electrical conductivity eventually contribute to the good performance of the resulted ZnO@C nanocomposites for LIBs should be ascribed to the proous structure and high BET surface area derived from ZIFs, as well as the good electrical conductivity of the amourphous carbon derived from ZIFs.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Yinan Gu,Guixiang Teng,Xiaodong Jin,Liping Wang,Zengwei Qiang,Weigang Ma,Chun Zhang
A coral-like ZnO/C-ZnFe2O4 (Z/C-ZFO) photocatalyst was synthesized by simulating the structural characteristics of coral since its structure is conducive to the capture and absorption of light. The synthesis process involves a two-step process. First, flowerlike hierarchical precursors were synthesized through a hydrothermal self-assembled route. Next, the precursors were thermally annealed in a nitrogen atmosphere after doping with a zinc source. In addition to forming heterojunctions that enhance its photocatalytic properties, the coral-like nanostructures endowed Z/C-ZFO with significant light-harvesting efficiency. Finally, the photocatalyst was used for antibacterial applications against Escherichia coli and Staphylococcus aureus bacteria. The results showed that the optimized sterilization efficiencies toward E. coli and S. aureus bacteria were 99.4 and 98.0%, respectively, combined with excellent cycling stability. The method of designing and synthesizing coral-like structures in this study may also be extended to the synthesis of other photocatalytic and optical materials.
研究领域:
材料科学
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环境科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 20
·9937-9945
·
IF 8.867
Huirong Chen,Kui Shen,Junying Chen,Xiaodong Chen,Yingwei Li
Semiconducting metal oxides have been considered as effective photocatalysts for the degradation of organic pollutants to decolorize contaminated water. However, the poor performance and difficulty in recycling greatly hinder their practical application. Herein, we designed and fabricated, for the first time, a novel ZnO@C–N–Co core–shell nanocomposite towards efficient and recyclable photocatalysis by directly pyrolyzing a hollow Zn/Co–ZIF matrix consisting of a ZIF-8 shell with some Co–ZIF nanoplates inside the hollow cavity. It was demonstrated that the ZIF-8-shell-derived ZnO nanoparticles could spontaneously agglomerate and move to the hollow cavity while the internal Co NPs transferred inversely to the ligand-derived N–C shell at suitable pyrolysis temperature, resulting in the unique ZnO@C–N–Co core–shell structure. This unique nanostructure possessed the following superior properties: (1) a core–shell structure may make the intermediate ZnO much more stable during the reaction; (2) a porous carbon shell can not only provide a high BET specific area and thus high adsorption capability for reactants, but can also inhibit the recombination of photogenerated electrons and holes; (3) the embedded Co NPs were able to provide richer electron traps that further suppress the recombination of electrons and holes. As exemplified for the degradation of methyl orange, the ZnO@C–N–Co showed a significantly improved performance and excellent recyclability due to the highly synergistic effects between the C–N–Co shell and the robust ZnO. This strategy for the synthesis of MOF-derived core–shell nanomaterials could offer prospects for developing highly efficient photocatalysts.
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
POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Junxiu Liu,Ruiping Wang,Dequan Liang,Shuo Zhang,Jingqi Feng,Miaojun Xu,Shuai Du,Bin Li
An urchin-like carbon and nitrogen-doped zinc oxide (U-ZnO@C-N) was prepared by calcination of zeolitic imidazolate framework-8, and it was used as synergist. Firstly, the intumescent flame retardant (IFR) containing piperazine pyrophosphate and melamine polyphosphate with a mass ratio of 2:1 was introduced into linear low density polyethylene (LLDPE). The LLDPE/IFR passed UL-94 V-0 rating during the vertical burning tests with a limiting oxygen index (LOI) of 26.0% when 25 wt% IFR was incorporated. The LLDPE composite also reached UL-94 V-0 rating when 23 wt% IFR/U-ZnO@C-N with a mass ratio of 97:3 was introduced, and its LOI value was 26.2%. It was indicated that the addition of U-ZnO@C-N enhanced the flame retardant efficiency of LLDPE. Meanwhile, the total smoke release of LLDPE/IFR/U-ZnO@C-N was reduced by 25.5% and 30.5%, respectively, compared to LLDPE/IFR and LLDPE/commercial zinc oxide (C-ZnO). It was attributed that the U-ZnO@C-N with urchin-like structure served as the skeleton and fulcrum during the formation process of char layer, which effectively improved the strength of char layer. In addition, the free electron-holes in the semiconductor U-ZnO@C-N oxidized CO to CO 2 , effectively reducing the release of toxic gas. This work provided a valuable way to prepare LLDPE composites with high flame retardancy, smoke inhibition and low toxicity, which was expected to break the limitations of LLDPE in wires and cables applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）