BIOELECTROCHEMISTRY
·
2019
·
IF 4.474
Mei Wu,Yuxiao Yang,Kaihang Cao,Chulei Zhao,Xiuwen Qiao,Chenglin Hong
In this study, a novel signal-amplified immunosensor was designed by using a microwave-assisted self-assembly method to synthesize ZnFe 2 O 4 -Ag/rGO nanocomposites. The conductivity of ZnFe 2 O 4 -rGO nanocomposites was significantly improved due to the effective inhibition of rGO accumulation by the insertion of ZnFe 2 O 4 and Ag nanoparticles (NPs) into graphene sheets. Excellent sensitivity and reproducibility were achieved through the microwave-assisted preparation of ZnFe 2 O 4 -Ag/rGO nanocomposites as a substrate, with the Ag NPs enhancing the signal because of the effective conductive matrix. The layer assembly process of the immunosensor was verified by cyclic voltammetry and electrochemical impedance spectroscopy. Under optimal conditions, the fabricated immunosensor showed good linearity over a wide concentration range from 1 pg mL −1 to 200 ng mL −1 with a low detection limit of 0.98 pg mL −1 , and exhibited excellent specificity, good stability, and reproducibility. These qualities can contribute to the successful application of a label-free immunosensor in the detection of AFP in human serum.
研究领域:
生物医学工程
·
分析化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 19
·1-15
·
IF 2.8
Suguna A.,Parthibavarman M.,Sridevi C.,Al-Mohaimeed A. M.,Al-onazi W. A.
New ternary nanocomposites for photocatalysis, composed of ZnFe 2 O 4 @ZnO@rGO, were synthesised in this work using a straightforward hydrothermal method. After characterising the samples' structures, morphologies, and photoelectric outcomes, researchers found that 25–30 nm ZnFe 2 O 4 @ZnO nanoparticles were securely attached to the surface of the rGO sheets' fibres. The photocatalytic activity in the deterioration of rhodamine B (RhB) was much enhanced by the ZnFe 2 O 4 @ZnO@rGO composite photocatalysts when compared to ZnO, ZnFe 2 O 4 , and ZnFe 2 O 4 @ZnO. With a degradation efficiency of 99.9% for RhB and 88.7% for MB after 60 min of ultraviolet (UV) radiation, the ZnFe 2 O 4 @ZnO@rGO composite photocatalyst stood out as the most active photocatalyst. In addition, this nanocomposite exhibited excellent adaptability for use in water treatment, since it could be magnetised apart and maintained a dye removal percentage of about 100% after eight cycles. Analysis of the photodynamic response and TRPL spectra further verified that the manufactured ternary composite had improved charge transfer efficiency. The synergy of multicomponent ternary nanocomposites may have contributed to the enhanced performance by increasing absorption capacities automatically, discouraging the reconsolidation of electron–hole couples, and inducing the photodeveloped separation of proteins.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2022
·
IF 4.331
Yirui Zhao,Hang Yang,Hongshun Hao,Fuxiao Zhu,Gongliang Zhang,Jingran Bi,Shuang Yan,Hongman Hou
The removal of organic dyes and pathogenic bacteria from contaminated water remains a significant challenge. In the present study, S-type heterojunction Ag2MoO4/ZnFe2O4 (AMO/ZFO) composite nanofibers were synthesized by electrospinning and co-precipitation and fabricated into photoanodes. It is found that the constructed S-type heterojunction of AMO/ZFO composites effectively inhibits the recombination of photogenerated carriers, in addition to the benefits of more exposed active sites and a greater specific surface area. When several properties are improved, AMO/ZFO composites exhibit excellent photoelectrocatalytic performance. The results demonstrate that under visible light irradiation, the photoelectrocatalytic degradation rate of AMO/ZFO-3 to methylene blue reached 76.2% within 50 min, and the killing rate of Salmonella was 83.6% within 80 min. The enhanced photoelectrocatalytic activity was due to the synergy of both electrochemical and photocatalytic effects. More importantly, after four testing cycles, AMO/ZFO-3 still has a better ability to kill pathogenic bacteria and degrade organic dyes due to its high stability. This work provides a feasible method for oxidizing organic dyes and pathogenic bacteria.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ke Zhang,Yajing Wei,Hongyang Cao,Yue Xin,Chuanyi Wang
Tuning reactive oxygen species in peroxymonosulfate (PMS) activation by the structure of catalysts has been extensively studied. But in photocatalysis , the photothermal effect is lack of attention on the alteration of reactive species produced by PMS activation. In this work, ZnFe 2 O 4 /C photocatalyst with oxygen vacancy (ZFO v /C) was synthesized via the calcination of bimetallic Zn/Fe-metal–organic framework. The photocatalytic performance of the catalyst had been studied under several conditions, and the experimental results demonstrated that the photocatalytic reaction rate constant of ZFO v /C photocatalyst without temperature control was 21.3 % higher than that under temperature control. Reactive species quenching experiments and electron paramagnetic resonance indicated that 1 O 2 and h + are the primary reactive species without temperature control, while only 1 O 2 are the dominant reactive species under temperature control conditions. The possible activation site was speculated by in-situ Raman spectroscopy , XPS spectra and cycling experiment. This paper analyzes the reasons for photocatalysis to improve the degradation rate of pollutant from the perspective of the change of reactive species generated by photothermal effect on PMS activation, which may open up opportunities to explore the maximum utilization of sunlight in PMS activation.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Xuechen Li,Chaojie Shi,Zixuan Feng,Jie He,Rui Zhang,Zhengchun Yang,Peng Pan,Huayi Li,Deqiang Feng,Lingcheng Zheng
The Si nanowires/ZnFe 2 O 4 /Ag composite photocatalyst is prepared by metal-assisted chemical etching and hydrothermal methods . Photoelectric conversion and photodegradation experiments show that the composite structure offers high photocatalytic performance under visible light. The photocurrent density of Si nanowires/ZnFe 2 O 4 /Ag is 1.76 mA/cm 2 , and the Methyl orange photodegradation rate is 19 % within 90 min. Furthermore, the photocatalytic activity of composite photocatalysts was studied under the magnetic field, which further improves the photocatalytic efficiency significantly. Energy band structure studies revealed that the interfacial contact in the Si nanowires/ZnFe 2 O 4 /Ag increases carrier transfer and charge separation, thereby improving photocatalytic performance. It can be seen from the I-V results that the Si nanowires/ZnFe 2 O 4 /Ag has a negative magnetoresistance . Therefore, in the presence of a magnetic field, photogenerated carriers can be more effectively transferred to the electrode surface to participate in the photocatalytic reaction with improved photocatalytic performance.
研究领域:
材料科学
·
光催化技术
·
环境科学
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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
·
环境科学
·
微生物学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Zijin Wang,Jun Wang,Yining Pan,Fangyang Liu,Yanqing Lai,Jie Li,Liangxing Jiang
A novel magnetic InVO 4 /ZnFe 2 O 4 composite with the synergistic effect of adsorption and photocatalytic activity has been prepared using a hydrothermal method and characterized by a series of analytical techniques. The addition of ZnFe 2 O 4 not only improves the adsorption capability in the case of more active sites and positive zeta potential but also broadens the absorption range and promotes visible light harvesting. The optimum activity was found at a mole ratio of ZnFe 2 O 4 :InVO 4 = 3:1 (IZ-4). The removal rate for methylene blue (MB) under the synergistic effect of adsorption and photocatalytic reaches 88.74%, which is 6.87 times and 14.11 times that of the pure InVO 4 and ZnFe 2 O 4 , respectively. Furthermore, the adsorption kinetics and isotherm investigations indicate that the adsorption process followed the pseudo-second-order kinetic and Langmuir isotherm models. The maximum adsorption capacity of MB as 97.12 mg/g is achieved on the IZ-4 composite, which is better than the adsorbents reported previously. A type-II heterojunction between InVO 4 and ZnFe 2 O 4 based on the results of Mott-Schottky (M-S) plots is proposed to facilitate the charge transfer and improve the photocatalytic activity. In terms of the experimental results of N 2 adsorption/desorption, zeta potential and photoluminescence emission spectra, a possible mechanism of MB removal is discussed. The InVO 4 /ZnFe 2 O 4 composite with a synergistic effect of adsorption and photocatalytic degradation increases the active adsorption sites and promotes the separation of photogenerated electron and holes, thereby improving the MB removal performance.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Sai Zhang,Ruoning Guo,Ming Liang,Li Li
ZnFe 2 O 4 (ZFO) poses great potential to activate peroxymonosulfate (PMS) and responds to visible light. In this work, ZFO was synthesized by a simple one-step hydrothermal method . In order to obtain the most desirable photoelectric performance, hydrothermal reaction parameters including pH, temperature, and time were innovatively regulated. Based on optimized ZFO, the visible light/PMS/ZFO (Vis/PMS/ZFO) system was established, which presented superior degradation efficiency of ciprofloxacin (CIP). It was verified that •OH and 1 O 2 were the main reactive species for CIP degradation. Besides, visible light was confirmed to promote formation of reactive species and accelerate charge transfer simultaneously. Therefore, the possible mechanism of catalysis was proposed and the enhancement of visible light for the PMS/ZFO system was elaborated. Based on the identified intermediates, three pathways of CIP degradation were illustrated. Moreover, water matrix posed an overall positive impact on CIP degradation. Experiments performing in real wastewater and repeated tests validated wide application of the Vis/PMS/ZFO system. In general, the designed synthesis of ZFO is feasible and the integration of ZFO with visible light for efficient PMS activation is a successful and promising method for wastewater treatment .
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2022
·Vol. 33
·期 9
·103725
·
IF 4.969
Ling Ding,Xiaolin Liu,Shuai Zhang,Jun Liao,Yong Zhang,Lin Zhang
The spinel composite doped with TiO 2 (TiO 2 @ZnFe 2 O 4 ) was prepared via in situ fabrication and template method to extract uranium(VI) from solution. Compared with ZnFe 2 O 4 and TiO 2 /ZnFe 2 O 4 , TiO 2 @ZnFe 2 O 4 showed a high adsorption efficiency (98.3%) and adsorption capacity (716.2 mg g −1 ), which mainly related to the uniform porous structure of TiO 2 @ZnFe 2 O 4 . After five adsorption–desorption cycles, the removal efficiency of TiO 2 @ZnFe 2 O 4 remained above 90%, indicating that TiO 2 @ZnFe 2 O 4 had excellent reusability. Besides, TiO 2 @ZnFe 2 O 4 possessed excellent adsorption selectivity for uranium(VI) in the existence of competitive ions. The Langmuir adsorption model and pseudo-second order model fitted well the adsorption process, which demonstrated that the remove behavior of uranium(VI) on TiO 2 @ZnFe 2 O 4 was a monolayer chemisorption process. The extraction behavior of TiO 2 @ZnFe 2 O 4 for uranium(VI) was mainly attributed to electrostatic attraction, complexation reaction and oxygen vacancy filling. This study not only provides a high efficiency adsorbent (TiO 2 @ZnFe 2 O 4 ) for the extraction of uranium(VI) from solution but also offers a new effective way to enhance the performance of spinel composite.
研究领域:
环境化学
·
核化学
·
材料科学
·
吸附科学
·
水处理技术
·
功能材料
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2018
·
IF 1.861
Xiaojuan Li,Bo Jin,Jingwen Huang,Qingchun Zhang,Rufang Peng,Shijin Chu
In this study, novel ternary Fe 2 O 3 /ZnO/ZnFe 2 O 4 (ZFO) composites were successfully prepared through a simple hydrothermal reaction with subsequent thermal treatment. The as-prepared products were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Brunauer-Emmett-Teller (BET) analysis, Barrett-Joyner-Halenda (BJH) measurement, and UV–vis diffuse reflectance spectroscopy (UV–vis DRS). The photocatalytic degradation of rhodamine B (Rh B) under visible light irradiation indicated that the ZFO composites calcined at 500 °C has the best photocatalytic activity (the photocatalytic degradation efficiency can reach up to 95.7% within 60 min) and can maintain a stable photocatalytic degradation efficiency for at least three cycles. In addition, the photocatalytic activity of ZFO composites toward dye decomposition follows the order cationic Rh B > anionic methyl orange. Finally, using different scavengers, superoxide and hydroxyl radicals were identified as the primary active species during the degradation reaction of Rh B.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Jintang Zhou,Bo Wei,Mengqing Wang,Zhengjun Yao,Ping Chen,Congyu Zhou,Zhejia Li
In the research of new type of absorbing materials, the influence of special three-dimensional (3D) microstructure and the composite effect of multi-component materials on the electromagnetic properties and absorbing properties of materials has attracted widespread attention. In this work, the 3D flower like ZnFe 2 O 4 ferrite (3D-ZFO) was prepared by two solution chemical precipitation processes, and then a simple ultrasonic and heat treatment process was used to uniformly load the prepared 3D-ZFO on graphene nanosheets (GNs). A new wave absorber (3D-ZFO/GNs) composed of two-dimensional (2D) and 3D materials was obtained. Interestingly, the coprecipitation of Fe 3+ and Zn 2+ in alkaline solution transforms the 3D flower like ZnO template composed of flakes into ZnFe 2 O 4 composed of lines. The combination with GNs can effectively enhance the conductance loss and dipole polarization, and create a new effective hetero interface. In addition, 3D-ZFO with high resistance and GNS with excellent conductivity form a micro circuit, which promotes the formation of micro current and is conducive to the dissipation of electromagnetic wave energy in the form of micro current. In the 2–18 GHz frequency band, 3D-ZFO/GNs with 5 wt% GNs can obtain an effective bandwidth of 5.56 GHz at a matching thickness of 1.5 mm. By controlling the thickness of the matching layer, the absorbing frequency band can be easily adjusted to meet the needs of multi-band absorbing. Considering the simple preparation process, the increase of the electromagnetic wave conduction path by the special microstructure and the synergistic effect of multiple loss mechanisms, we believe that the prepared 3D-ZFO/GNs is expected to be a candidate for high-efficiency microwave absorbers.
研究领域:
材料科学
·
电磁工程
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Xupeng Chen,Jun Yu,Yong Jin,Yunzhao Zhang,Jie He,Xingang Li,Chun Zhang
In this paper, C/ZnO/ZnFe 2 O 4 @ZnIn 2 S 4 ternary heterojunctions were prepared using Zn-Fe bimetal-organic frameworks (Zn-Fe MOFs) as precursors and applied to the photocatalytic degradation of tetracycline hydrochloride (TC). The experimental results show that 30 mg of the composite (FS-2) showed 96 % removal of 20 mg/L TC. The improved photocatalytic performance was attributed to the synergistic effect of the double S-scheme heterojunction and the carbon layer, which greatly facilitated the separation of electron-hole pairs by the reverse motion of electrons and holes driven by the difference of work functions and the built-in electric field at the interface. The carbon layer acts as an electronic bridge can further improve the charge transfer between the interfaces of different photocatalysts, allowing more useful electrons and holes with strong redox capabilities to participate in the surface reactions. Combining the experimental results and density functional theory (DFT) calculations, the photocatalytic mechanism of the dual S-scheme system is proposed. This study provides a theoretical basis for the design of novel photocatalytic materials with dual S-scheme heterojunctions and efficient photocatalytic degradation.
研究领域:
环境科学
·
材料科学
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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）