Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yingjie Guo,Jiayi Yan,Zan Chen,Cuijia Duan,Claudia Li,Yinhui Li,Sibudjing Kawi
The tendency of small-sized covalent organic framework (COF) nanoparticles to easily agglomerate, and the propensity of photo-generated carriers in α -Fe 2 O 3 to recombine pose challenges in the efficient removal of tetracycline (TC) through adsorption-photocatalysis synergy. This study addresses these challenges by introducing MIL-101, known for its excellent chemical stability and large specific surface area. The amino functional group facilitates the in-situ growth of acyl chloride-covalent organic framework (AC-COF) on the surface of MIL-101, resulting in the fabrication of AC-COF@MIL-101 with a core-shell structure. Loading α -Fe 2 O 3 through structural regulation leads to the preparation of the final α -Fe 2 O 3 /AC-COF@MIL-101 ternary nanocomposite. In α -Fe 2 O 3 /AC-COF@MIL-101 composites, the high surface energy of AC-COF is mitigated by the strong chemical energy of N C-N, reducing AC-COF aggregation and decreasing the recombination rate of photogenerated carriers in α -Fe 2 O 3 . The heterojunction structure between AC-COF@MIL-101 and α -Fe 2 O 3 enhances the degradation of TC, attributed to the synergistic effect of adsorption and photocatalysis. Experimental results demonstrate that α -Fe 2 O 3 /AC-COF@MIL-101 has a maximum adsorption capacity of 135.14 mg/g, achieving a 100% TC removal rate within 30 min. Compared to AC-COF, MIL-101, and α -Fe 2 O 3 , α -Fe 2 O 3 /AC-COF@MIL-101 exhibits higher adsorption capacity and photocatalytic activity. Specifically, its adsorption capacity is 2.1 times that of AC-COF, 1.8 times that of MIL-101, and 10.6 times that of α -Fe 2 O 3 . Additionally, its degradation ability is 8.6 times that of α -Fe 2 O 3 . The adsorption of TC by α -Fe 2 O 3 /AC-COF@MIL-101 occurs through monolayer chemical adsorption, and the process is exothermic. The main active species involved in the photocatalytic degradation process are h + and ·OH. This study introduces a new ternary composite multifunctional material with high adsorption and photocatalytic performance for TC, offering a potential strategy for enhancing the synergistically adsorption-photocatalytic effect in ternary composite systems.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
Physica Status Solidi-Rapid Research Letters
·
2023
·Vol. 18
·期 7
·2300102
·
IF 2.8
Wenlong Chu,Ruifeng Xin,Luwei Zou,Xiulian Fan,Xilong Zhou,Cheng Li,Yu Zhou
2D nonlayered materials have attracted more and more attention due to their novel properties and special surface structures. However, due to isotropic chemical bonds within the crystal, the synthesis of ultrathin 2D nonlayered materials is an urgent challenge. Herein, α -Fe 2 O 3 2D nanosheets as thin as ≈8.2 nm on different substrates using self-designed ultralow concentration precursors combined with Gibbs free energy and Se catalysts design are successfully synthesized. The thickness-dependent growth mechanism is systematically studied, demonstrating the thermodynamic and kinetic controlling factors. The as-grown α -Fe 2 O 3 nanosheets are demonstrated with single-crystal structures without any other elements doping. The α -Fe 2 O 3 nanosheets photodetectors show the reasonable response performance with the positive photoconductive mechanism. This improved chemical vapor deposition method provides a promising idea for the synthesis of ultrathin 2D nonlayered materials.
研究领域:
材料科学
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纳米科技
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表面科学
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凝聚态物理
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光电子学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Wenjing Pan,Yong Zhang,Sujing Yu,Xiaohua Liu,Dongzhi Zhang
The metal-organic framework (MOF)-derived alpha-iron oxide hollow nanosphere/molybdenum diselenide nanoflower (α-Fe 2 O 3 /MoSe 2 ) composite is fabricated via simple hydrothermal route. Multiple characterization methods have proved the successful synthesis of α-Fe 2 O 3 /MoSe 2 composites. The nanocomposite with a mass ratio of α-Fe 2 O 3 and MoSe 2 of 4:1 shows high response to H 2 S gas sensing. Moreover, the gas sensitivity test of the system shows that the α-Fe 2 O 3 /MoSe 2 composite sensor exhibits a faster response/recovery rate, outstanding repeatability and anti-humidity interference toward H 2 S sensing at room temperature, which also shows excellent selectivity for H 2 S compared to various potentially interfering gases. Further studies have shown that α-Fe 2 O 3 /MoSe 2 nanocomposites have improved H 2 S gas sensing performance due to the increased active sites and specific surface area, and the formation of n-n heterojunctions at the interface between α-Fe 2 O 3 hollow nanospheres and MoSe 2 nanoflowers.
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
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yu Bing,Zhao Song,Hongtao Jiang,Xiaoyi Xu,Zhongzheng Yu,Tingting Zhou,Tong Zhang
Water competitive adsorption and limited reaction sites on the micro-scale sensing area of micro-electro-mechanical system (MEMS) sensors are two bottleneck problems that restrict the detection of trace indoor polluted gases, leading to drifting and weak signals. To address this, a “duet-insurance” sensing strategy is proposed to protect and amplify the sensing signal. For the first-level protection, the well-designed double-layer structure consisting of Janus TpMa covalent organic framework (COF)/Eu-doped α-Fe 2 O 3 can resist diffusion of water molecules and facilitate the electron transfer from formaldehyde (CH 2 O) to sensing layers, benefiting from the outer hydrophobic character of Janus TpMa and the strong CH 2 O adsorption capacity of Eu-doped Fe 2 O 3 . For the second-level amplification, the unique variable temperature excitation facilitates the deep penetration of CH 2 O into the active sites across COF layers, enabling signal amplification through thermally actuated carrier modulation. The sensor demonstrates high sensing ability to the CH 2 O, with an ultra-low limit of detection of 794 ppt. Leveraging the novel sensing strategy, a multi-functional, visual sensing system is designed to identify multi-indoor pollution gases by feature signal encoding and color mapping, showcasing the promising potential for MEMS sensors based on Janus TpMa COF/Eu-doped α-Fe 2 O 3 materials.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 32
·期 8
·085502
·
IF 3.551
Shujing Wu,Juan Du,Qisen Xiang,Dianbo Zhao,Yanhong Bai
The immunochromatographic strip test (ICST) is a powerful on-site detection technology due to its unique advantages of simplicity, rapidity, and readability by the naked eye. Here we illustrate the potential of α-Fe2O3 polyhedrons as a novel visual label, which exhibit advantages of high stability and economy, for the detection of Listeria monocytogenes (L. monocytogenes) as a model foodborne pathogen. A low-cost and simple one-step solvothermal approach was developed for the synthesis of α-Fe2O3 polyhedrons; the average diameter of the α-Fe2O3 polyhedrons is about 200 nm. The crystal structure and morphology of α-Fe2O3 polyhedrons were characterized by x-ray diffraction and transmission electron microscope. α-Fe2O3 polyhedrons were immunized with anti-L. monocytogenes antibody to prepare an antibody–colloidal α-Fe2O3 polyhedron ICST. Visual detection can be obtained directly by the naked eye within 10 min. The detection limit of L. monocytogenes by α-Fe2O3 polyhedron ICST assay was 3.8 × 106 and 5.6 × 106 CFU/ml of pure culture and artificially spiked orange juice drink sample, respectively. Results indicated that the antibody–colloidal α-Fe2O3 polyhedron ICST is a rapid, simple, and low-cost assay. This approach showed great potential in the application of foodborne pathogen detection concerning food safety.
研究领域:
材料科学
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分析化学
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食品安全
✓ 已验证
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2025
·
IF 7.7
Luheng Wang,Maoyuan Nan,Xisi Long
The coil-shaped element based on α-Fe 2 O 3 doped multi-walled carbon nanotubes (MWCNTs) is fabricated by sputtering and spraying technology for simultaneously measuring the gap and ethanol vapor at room temperature. The experimental results show that with the increase of spraying time, the gas response properties of MWCNTs-based coil-shaped elements change from p-type to n-type, while the gas response properties of the coil-shaped elements based on α-Fe 2 O 3 doped MWCNTs change from n-type to p-type with the increase of mass ratio of α-Fe 2 O 3 to MWCNTs. Particularly, the coil-shaped element with a mass ratio of 100 exhibits the highest gas response value and gap sensitivity in the gap range of 0–0.5 mm, the gas response value of impedance amplitude, impedance angle, and resistance is 0.659 %, 0.265 %, and 6.768 % at the ethanol vapor concentration of 5000 ppm, respectively. The absolute/relative gap sensitivity of impedance amplitude and impedance angle is 54,101.8 Ω·mm −1 /4.589 %·mm −1 and 2.069°·mm −1 / 5.287 %·mm −1 in the gap range of 0–0.1 mm, respectively. Finally, a signal processing method is proposed for the simultaneous measurement of ethanol vapor concentration and gap. These results lay a foundation for the development of MWCNTs-based sensors and the sensors applied between narrow gaps.
研究领域:
传感器技术
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材料科学
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产品关联
DOI
高影响因子
BIOELECTROCHEMISTRY
·
2024
·
IF 4.8
Zhihao Xu,Zhixiang Lv,Huijiao Yang,Jiashuo Zhang,Zijie Sun,Dawei He,Ruijiang Liu
A label-free electrochemical DNA detection strategy based on self-assembled α-Fe 2 O 3 /Fe 3 O 4 nanosheets with PNA-DNA hybridization process was developed for ultrasensitive detection of APOE ε4 gene, one of the most robust genetic risks for Alzheimer’s Disease (AD). In this work, magnetic α-Fe 2 O 3 /Fe 3 O 4 heterogeneous nanosheets were prepared by hydrothermal-calcined reduction method and loaded with Au nanoparticles (AuNPs) on their surfaces. The magnetic α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites significantly enhanced the electrochemical response as a signal amplification matrix and were able to bind to the magnetic glassy carbon electrode (MGCE) surface by magnetic self-assembly. Moreover, owing to the high specificity and stable binding capacity of PNA with respect to the target DNA, the biosensor not only enabled accurate (the limit of detection was estimated to be 0.147 pM) and rapid detection of the APOE ε4 gene, but also exhibited excellent specificity, stability and regeneration capability. Additional, the satisfactory recoveries were also obtained in real samples of human serum, ranging from 92.83 % to 106.22 % with relative standard deviation (RSD) between 0.25 % and 1.85 %. The results possessed important reference value for exploring the application of DNA biosensor technology in the diagnosis of APOE gene mutation.
研究领域:
生物传感器技术
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医学诊断
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xing-Yu Wang,Ping-Ping Liu,Hai-Jie Cai,Miao-Miao Li,Chun-Hui Deng,Yong Zhao,Zhao-Huan Zhang,Yong-Heng Zhu
Biomarkers detection of foodborne pathogens through gas sensors provides a promising method to ensure food safety. However, rapidly and accurately identifying ultra-low concentration bacterial biomarkers is still an urgent task. In this study, PdRh bimetallic-loaded α-Fe 2 O 3 nanospindles with sufficient exposed surface and high surface activity are designed to achieve sensitive detection of the Listeria monocytogene biomarker s : 3-hydroxy-2-butanone. α-Fe 2 O 3 nanospindles with high exposure surfaces were prepared by modulating the axial diameter ratio. Then PdRh bimetals were uniformly introduced to regulate the surface activity of α-Fe 2 O 3 nanospindles. Compared to pure Fe 2 O 3 , the result 1.5 wt% PdRh-Fe 2 O 3 nanospindle exhibits significantly improved sensitivity and selectivity in detecting 3-hydroxy-2-butanone, characterized by a reduced operating temperature from 240°C to 150 °C, high sensitivity (R a /R g = 148.4, 50 ppm), impressive response/recovery time (7/10 s), low detection limit (200 ppb), notable selectivity, and great stability over a test period exceeding 30 days. Mechanism studies through ex/in-situ characterization and density functional theory calculations (DFT) reveal that the dramatic sensing performance advancement is mainly due to the morphology optimization, bimetallic activation, and their synergistic effects, leading to the increased surface active species, enhanced oxygen mobility, and the reduced activation energy. Furthermore, high-sensitivity detection of Listeria monocytogenes in actual samples is also achieved by using 1.5 wt% PdRh-Fe 2 O 3 nanoneedles-based sensor, indicating its significant potential for non-destructive testing applications in the food industry and opening new avenues for the rapid detection of Listeria monocytogenes .
研究领域:
材料科学
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食品科学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Weiguang Hu,Qinghua Xia,Lian Ying Zhang,Jianguo Lu,Qinggang He,Weiyong Yuan
Amorphous MOFs (a-MOFs) could be highly promising cocatalysts of 3-D α-Fe2O3 to greatly improve its photoelectrochemical oxygen evolution performance, but their effective synthesis and assembly on 3-D α-Fe2O3 presents formidable challenges. A conformal and ultrathin layer of amorphous Co–TDPAT (a-Co–TDPAT) MOF cocatalyst has been in situ self-assembled on an α-Fe2O3 nanosheet array (NSA) by employing 5,5′,5″-(1,3,5-triazine-2,4,6-triyl)tris(azanediyl)triisophthalic acid (H6TDPAT) as the organic ligand. The obtained α-Fe2O3 NSA@a-Co–TDPAT core–shell NSA exhibits a photocurrent density of 1.54 mA cm−2 (1.23 V), onset potential of ∼0.48 V, and photoconversion efficiency of 0.25%, 6.2 times higher, 290 mV lower, and 12.5 times higher, respectively, than those of the α-Fe2O3 NSA. The photocurrent density and the photoconversion efficiency are among the highest reported for photoanodes based on the FTO-supported α-Fe2O3 NSA without addition of noble metals, and the onset potential is the lowest among those of FTO-supported α-Fe2O3-based photoanodes reported. It is discovered that a-Co–TDPAT significantly enhances charge separation and accelerates charge transport and transfer for a fast oxygen evolution reaction, thus greatly boosting PEC oxygen evolution. This work not only provides a novel strategy to produce highly efficient, highly stable, low-cost, and earth-abundant core–shell water splitting photoanodes via in situ self-assembly of conformal, ultrathin a-MOFs on an α-Fe2O3 NSA, but sheds light on the mechanisms for controlled self-assembly of MOFs and PEC performance enhancement of α-Fe2O3-based photoelectrodes.
研究领域:
材料科学
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光催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2022
·
IF 5.545
Yang Shuhui,Ke Xi,Zhang Menglong,Luo Dongxiang
Metal nanoparticles have been extensively used as co-catalysts in photocatalytic systems in order to pursue improvements in both reaction kinetics and selectivity. In this work, PdAg dual-metallic nanoparticles synthesized by the co-reduction method were decorated on a well-established α-Fe2O3/CdS Z-scheme photoactive material as a co-catalyst to study their performance for promoting the photoreduction of CO2. Herein, α-Fe2O3 and CdS were in situ synthesized on fluorine-doped tin oxide (FTO) glass by hydrothermal and SILAR (successive ionic layer adsorption and reaction) methods, respectively. The direct Z-scheme charge transfer path between Fe2O3 and CdS and the effective electron migration toward the PdAg mainly contributed to the excellent photocatalytic CO2 reduction performance. The controllable work function based on Pd (5.12) and Ag (4.26) constructed an appropriate band alignment with α-Fe2O3/CdS and displayed favorable production for CH4 rather than CO. The optimum ratio of PdAg 1:2 performed a 48% enhancement than pure Pd for photoreduction of CO2. Meanwhile, the enhanced charge separation improved the photoelectrochemical performance and photocurrent generation, and reduced the electrical resistance between components. This work provided insights into the dual-metallic co-catalyst for boosting the activity and selectivity of photocatalytic CO2 reduction.
研究领域:
材料科学
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化学工程
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环境科学
·
纳米技术
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Zhenyu Yan,Wenyu Gao,Chenkai Zhong,Qiangqiang Jiao,Shujie Tian,Jia Liu
Ammonia (NH 3 ) plays an important role in agricultural production and is also an ideal zero-carbon energy source in sustainable hydrogen economy. Electrocatalytic nitrate (NO 3 - ) reduction reaction can simultaneously consume nitrogen pollutants in water during the synthesis of NH 3 , which is the most promising and gentle alternative process to the Haber-Bosch. However, due to the interference of hydrogen evolution reaction and high overpotential, the development of efficient directional ammonia conversion catalysts has become the key. In this study, Mo-Fe 2 O 3 material were fabricated by crystal face engineering and orbital manipulation strategies. The (001) face of α-Fe 2 O 3 with the best electrochemical performance was exposed by thermodynamic control, and the in-situ substitution of Mo single atoms for near-surface Fe atoms was further used to achieve excellent ammonia synthesis activity. NH 3 yield of 493.67 μg/h/mg cat and Faraday efficiency of 95.0% were achieved at -0.5 V vs. RHE (pH=7, 0.1 M PBS+500 ppm NO 3 - ). The mechanistic analysis showed that the highly electronegative Mo atoms induced strong interaction by Fe-O-Mo bond, which prompted Fe(III) to preferentially fill the lower t2g orbital and form a low-spin state. The weaker anti-bonding state enhances the interaction between Fe(III) and the coordinating O atoms in NO 3 - , thereby strengthening electron transfer. In summary, the targeted regulation of the crystal facet and electronic orbitals of catalysts presents a promising strategy for enhancing the conversion of NO 3 - to NH 3 .
研究领域:
材料科学
·
电化学
·
催化反应
✓ 已验证
产品关联
DOI
高影响因子
VACUUM
·
2023
·
IF 4
Chaoqun Yan,Zhiliang Cheng,Xuan Zhang,Juan Wei,Qian Xu
The photocatalytic efficiency of hematite (α-Fe 2 O 3 ) is limited by its photoexcited state lifetime and diffusion length. By adjusting the surface structure, the photogenerated electron pairs can migrate to the surface and the charge recombination can be suppressed, which can effectively solve these problems and improve the photo-Fenton performance. In this study, four kinds different morphologies of α-Fe 2 O 3 - x (truncated hexagonal bipyramidal, cubic, hexagonal shape, and spherical) were synthesized by hydrothermal method , and a photocatalyst (H-α-Fe 2 O 3 - x ) with higher catalytic activity was prepared by hydrogenation. The results of UV–Vis DRS , PL , Raman, and XPS analysis , the oxygen vacancies and Fe (II) species were introduced into the α-Fe 2 O 3 catalyst after the hydrogenation reaction. The H-α-Fe 2 O 3 - x showed good degradation performance for TC and DX as EMPs model pollutants. The results show that the formation of oxygen vacancy and Fe 2+ is the main factor to improve the photocatalytic activity of the reaction system. Furthermore, the reaction mechanism revealed that reactive radicals involved in the H-α-Fe 2 O 3 - x photocatalytic system were •OH, •O 2 − , and h + responsible. This study provides an alternative technology for an easy and effective means for bandgap engineering to improve the photocatalytic performance of photocatalysts and facilitate widening environmental application.
研究领域:
环境科学
·
材料科学
·
化学
·
光催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）