Molecular Catalysis
·
2021
·
IF 5.062
Junyi Liu,Xianxiang Liu,Qiong Xu,Dulin Yin
A series of highly active and ortho -position selective catalysts based on (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were proposed for the C -methylation of phenol with methanol. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were synthesized by coprecipitation method of Fe and V elements and microwave drying. The chemical composition, material structure, acid-base properties, and structure-activity relationship of (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts were systematically analyzed by the techniques of XRD, XPS, TEM, N 2 adsorption-desorption, Raman, UV-Vis, ESR, NH 3 /CO 2 -TPD and Pyridine-IR. The (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have the double advantages of high activity and high stability for the methylation of phenol due to the high BET surface area, large total pore volume, dispersive active sites and enhanced acid-base property. o -cresol and 2,6-xylenol were the main products, and nearly 100% selectivity to the ortho -position of phenol and 90% selectivity to o -cresol were obtained. Furthermore, the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts possess long lifetime over 2500 h and high activity at a weight hourly space velocity of 1.6 h −1 compared with the microwave-dried α-Fe 2 O 3 catalyst. The doping of vanadium improves the activity and stability of α-Fe 2 O 3 catalyst, which attributes to the modification of catalyst structure, especially the improvement of acid-base centers and oxygen vacancy. Recently the (α-Fe 2 O 3 ) 1- x (V 2 O 5 ) x catalysts have been stably and efficiently applied in industry for the methylation of phenol.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qingxiang Wang,Hezhong Ouyang,Wentao Li,Hexiao Zhang,Aolin He,Ruijiang Liu
The Kirsten Rat Sarcoma Viral Oncogene (KRAS) represents one of the most frequently mutated oncogenes in a variety of malignant tumors, including non-small cell lung cancer (NSCLC), colorectal cancer (CRC), and pancreatic ductal adenocarcinoma (PDAC). Therefore, it is regarded as a pivotal tumor marker, and the detection of it holds immense significance in the realm of tumor prevention, diagnosis, and disease monitoring. In this project, an α-Fe 2 O 3 /Fe 3 O 4 @Au-DNA/BSA probe was progressively constructed to capture KRAS, and the binding probe was immobilized onto the surface of magnetic glass carbon electrodes (MGCE) through magnetic self-assembly for detection purposes. The fabrication process was validated by changes observed in cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) data. Differential pulse voltammetry (DPV) was employed to optimize crucial experimental conditions and analyze biosensor performance. This condition optimization resulted in enhanced sensitivity of the biosensor, leading to improved linearity of data obtained. The limit of detection (LOD) achieved was 1.93 pM, with a limit of quantification (LOQ) at 5.84 pM, and a linear range ranging from 10 pM to 1 μM. Additionally, the stability (the current maintaining stability during the initial eight days), reproducibility (RSD = 2.47 %), selectivity, and real sample analysis (recovery rates ranging from 95.26 % to 109.80 %, RSD ≤ 1.22 %) were found to be favorable. These findings suggest promising prospects for practical applications of this biosensor.
研究领域:
肿瘤学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Hongjie Zhu,Lingxuan Gong,Zhengkui Li
There is a great need to design a new method for fabricating efficient and cheap Z-scheme photocatalysts. For this reason, we synthesized a novel Z-scheme photocatalyst α-Fe 2 O 3 /P3HT with O-Ti-O charge transfer mediator. The effective compounding of each part was confirmed by different characterization methods. The charge transfer mechanism was confirmed to obey the Z-scheme mechanism by measuring the valence band value and by ESR experiments. Moreover, the Z-scheme mechanism in this system was further discussed based on the observed changes in the chemical structure and the theoretical calculation. Based on the characterization of the optical properties, this novel catalyst exhibited better charge transfer and separation abilities under visible light conditions due to its unique architecture. Additionally, this novel Z-scheme photocatalyst showed enhancement in the bisphenol A degradation effect, the degradation reaction was pseudo-first-order kinetics, a removal rate of up to 90% was maintained after four cycles. The BPA degradation pathway was also discussed in this study. This study provides a new approach for the construction of Z-scheme 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
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Zhang Tian,Zheng Qiang,Fu Yike,Xie Congkun,Fan Gonglin,Wang Yifan,Wu Yongjun,Cai Xiujun,Han Gaorong,Li Xiang
Sonodynamic therapy (SDT), presenting spatial and temporal control of ROS generation triggered by ultrasound field, has attracted considerable attention in tumor treatment. However, its therapeutic efficacy is severely hindered by the intrinsic hypoxia of solid tumor and the lack of smart design in material band structure. Here in study, fine α-Fe 2 O 3 nanoparticles armored with Pt nanocrystals (α-Fe 2 O 3 @Pt) was investigated as an alternative SDT agent with ingenious bandgap and structural design. The Schottky barrier, due to its unique heterostructure, suppresses the recombination of sono-induced electrons and holes, enabling superior ROS generation. More importantly, the composite nanoparticles may effectively trigger a reoxygenation phenomenon to supply sufficient content of oxygen, favoring the ROS induction under the hypoxic condition and its extra role played for ultrasound imaging. In consequence, α-Fe 2 O 3 @Pt appears to enable effective tumor inhibition with imaging guidance, both in vitro and in vivo. This study has therefore demonstrated a highly potential platform for ultrasound-driven tumor theranostic, which may spark a series of further explorations in therapeutic systems with more rational material design. Graphical Abstract
研究领域:
纳米技术
·
生物医学工程
·
癌症治疗
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Zheng Fang,Wei He,Tao Tu,Niuniu Lv,Chuanhong Qiu,Xin Li,Ning Zhu,Li Wan,Kai Guo
α-Fe 2 O 3 nanoparticles were prepared by using a continuous precipitation method with a valve assisted micromixer in the presence of iron (III) sulfate and ammonia water. The resulting nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM). Meanwhile, CaCO 3 nanoparticles were synthesized in a tube-in-tube flow reactor AF-2400. The acylation process catalyzed by modified lipophilic α-Fe 2 O 3 and CaCO 3 nanoparticles in the flow reactor were systematically investigated. Under the optimal conditions, a yield of 97.8% was obtained. Addition of CaCO 3 nanoparticles resulted in higher catalytic efficiency compared with pure modified α-Fe 2 O 3 nanoparticles. Moreover, this novel acylation also worked well for other substrates.
研究领域:
化学工程
·
材料科学
·
绿色化学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Zhong-Shuai Zhu,Jin Qu,Shu-Meng Hao,Shuang Han,Kun-Le Jia,Zhong-Zhen Yu
High activity and long-term stability are particularly important for peroxymonosulfate (PMS)-based degradation processes in wastewater treatment, especially under a flowing state. However, if the highly active nanomaterials are in a powder form, they could disperse well in water but would not be convenient for application under varied flow rates. A metal oxide/bacterial cellulose hybrid membrane fixed in a flowing bed is expected to solve these problems. Herein, α-Fe2O3 nanodisk/bacterial cellulose hybrid membranes as high-performance sulfate-radical-based visible light photocatalysts are synthesized for the first time. The bacterial cellulose with excellent mechanical stability and film-forming feature not only benefits the formation of a stable membrane to avoid the separation and recycling problems but also helps disperse and accommodate α-Fe2O3 nanodisks and thus enhances the visible light absorption performances, leading to an excellent PMS-based visible light degradation efficiency under both stirring and flowing states. Particularly, the optimized hybrid membrane photocatalyzes both cationic and anionic organic dyes under a flowing bed state for at least 84 h with the catalytic efficiency up to 100% and can be easily separated after the reaction, confirming its remarkable catalytic performance and long-term stability. Even under varied flow rates during the continuous process, it efficiently degrades rhodamine B and orange II from 3 to 16 mL h–1. When the flow rate goes back from high to low, the hybrid membrane quickly recovers its original performance, demonstrating the high activity and stability of the α-Fe2O3/bacterial cellulose membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Che Han,Yujie Wang,Jintao Liu,Qiangyi Deng,Hongmei Zhang,Shuang Xu,Conglu Zhang
There is growing attention in the removal of microplastics (MPs) from aquatic environment because of their toxicity and difficulty in degradation. Magnetic Fe 3 O 4 is a potential material for MP removal, however, for fabrication of high-efficiency Fe 3 O 4 -based adsorbents, the alkaline synthesis conditions and weak affinity toward MPs must to be addressed. In this study, we developed magnetic α-Fe 2 O 3 /Fe 3 O 4 hybrid adsorbents (MFes) with engineered affinity sites via a facile one-pot synthesis method. During the material formation process, melamine acted as both a nitrogen source for creating N-modified polar adsorption sites and an inducer for formation of α-Fe 2 O 3 /Fe 3 O 4 phase interfaces. The α-Fe 2 O 3 /Fe 3 O 4 phase interfaces provided additional active sites, as evidenced by the enhanced microplastic adsorption performance. The MFe-1.6–100 achieved 92.3 % polystyrene removal at low adsorbent dosage 0.2 g L −1 and showed rapid adsorption kinetics within 25 min, which is superior to most reported values. After five cycles, the removal efficiency could still retain 90 %. Additionally, MFe-1.6–100 exhibited remarkable ion-tolerance for Cl - and NO 3 - . These performances suggest its potential applicability for MPs capture in aquatic environments.
研究领域:
环境科学
·
材料科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Congyi Zhao,Yaxu Zhao,Lianqi Wang,Ke Lu,Wei Guo,Xiong Lu,Faming Gao
In this experimental study, a highly sensitive electrochemical acetylcholinesterase (AChE) biosensor for the detection of organophosphorus pesticides (OPs) based on three-dimensional α-Fe 2 O 3 nanoflowers decorated with Au nanoparticles (AuNPs) and carbon nanotube (CNTs) (α-Fe 2 O 3 NFs-AuNPs-CNTs) was developed. With the blooms structure, the α-Fe 2 O 3 NFs not only provided an excellent microenvironment for the loading of AChE, but also increased the contact specific surface area. Meanwhile, AuNPs dispersed uniformly on the α-Fe 2 O 3 nanosheets and CNTs further enhanced the conductivity of the nanocomposites. Under the optimized conditions, the biosensor was made to exhibit favorable linear relationship with the logarithm of the concentration of omethoate from 1 × 10 −13 -1 × 10 −7 M, with the detection limit of 1.9 × 10 −15 M. In addition, the biosensor also possessed good repeatability, stability and practicality, proved to be a valuable tool for the detection of pesticides in environment.
研究领域:
分析化学
·
环境科学
·
纳米材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Xiaojun Guo,Yanan Xu,Fei Zha,Xiaohua Tang,Haifeng Tian
Hematite (α-Fe 2 O 3 ), as one of Fenton reagents, is widely investigated for the treatment of wastewater in the field of advanced oxidation processes (AOPs). Considering the fast charge carrier recombination of hematite (α-Fe 2 O 3 ), we have successfully synthesized a novel and high active heterogeneous Fenton catalyst α-Fe 2 O 3 /Cu 2 O(SO 4 ) for the degradation of organic pollutants. The results show that the as-obtained Cu 2 O(SO 4 )-Fe9 composite exhibits excellent degradation properties of Orange II. 98.9% degradation rate was achieved for 100 mL of 50 mg/L Orange II solution in the condition of 0.3 g/L Cu 2 O(SO 4 )-Fe9 catalyst, 3 mM H 2 O 2 and pH = 3.5. The degradation rate constants of Cu 2 O(SO 4 )-Fe9 in the photo-Fenton-like system are 9.33 and 4.07 times of Cu 2 O(SO 4 ) and α-Fe 2 O 3 , respectively. In addition, the mechanism and pathway for the degradation of Orange II were proposed. The scheme of combining copper-based oxysulfate Cu 2 O(SO 4 ) with hematite (α-Fe 2 O 3 ) could improve the efficiency of charge carrier separation, which will further enhance the catalytic activity and expand its application in water purification.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Ronghao Wu,Xin Hu,Yihui Li,Yongfu Li,Yanjiang Cai,Peikun Jiang,Bing Yu
Constructing bimetallic nanostructures with specific crystalline phases provides an attractive strategy to develop highly efficient catalysts and explore structure-dependent catalytic properties. Herein, a new iron-based bimetallic catalyst consisting of amorphous MnO 2 and crystalline α-Fe 2 O 3 was synthesized for peroxymonosulfate (PMS) activation, named as a-MnO 2 /α-Fe 2 O 3 . The results show that the removal efficiency of sulfamethoxazole is over 90% within 120 min by the a-MnO 2 /α-Fe 2 O 3 in the presence of PMS at broad pH conditions ranging from 3 to 9. Furthermore, a complete degradation of bisphenol A (BPA) is achieved within 2 min in the a-MnO 2 /α-Fe 2 O 3 /PMS system under optimum conditions, and the BPA degradation rate constant of 1.67 min −1 outperforms most reported Fe- and Mn- based catalysts. The results of electron paramagnetic resonance analysis, quenching tests and Raman spectroscopy analysis show that the mechanism for the a-MnO 2 /α-Fe 2 O 3 -based PMS activation is dominated by the formation of activated surface-PMS complexes. ≡Mn(Ⅳ)–OH and ≡Fe(III)–OH of a-MnO 2 /α-Fe 2 O 3 are active sites for PMS adsorption to form inner-sphere complexes (≡Mn(Ⅳ)-OOSO 3 - ) through the replacement of surface hydroxyl groups. Finally, the a-MnO 2 /α-Fe 2 O 3 exhibits a remarkable removal efficiency of over 99% for BPA in column-bed tests conducted over 600 cycles, demonstrating its immense potential for practical applications.
研究领域:
环境科学
·
催化
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Qingxiang Wang,Min Liu,Jihong Zhao,Jiahao Yuan,Shasha Li,Ruijiang Liu
The prevention, diagnosis and treatment of cancer have always been the focus of medical research. In this study, a label-free, rapid, simple, sensitive, and specific method for the detection of HPV16 E7 oncoprotein was developed. The electrochemical biosensor platform was constructed by magnetic self-assembly of α-Fe 2 O 3 /Fe 3 O 4 @Au nanocomposites onto the surface of magnetic glass carbon electrode (MGCE), and the nanocomposite was connected to aptamer through Au S bond to construct a probe to capture HPV16 E7. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were applied to verify the performance of the constructed biosensor. The condition optimization and performance analysis were carried out by differential pulse voltammetry (DPV). Under optimal conditions, the biosensor exhibited a strong linearity between current value and the logarithm of HPV16 E7 oncoprotein concentration in the range of 10 pg/mL – 0.1 μg/mL, with a limit of detection (LOD) of 159 fg/mL and a limit of quantification (LOQ) of 530 fg/mL, and it also revealed excellent reproducibility, long-term stability, and anti-interference ability. In a word, the biosensor would contribute to the early diagnosis of oncoprotein HPV16 E7 and had promising application prospects.
研究领域:
医学诊断
·
生物传感技术
·
纳米材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Zigui Luo,Xi’an Fan,Wentao Hu,Fan Luo,Jian Wang,Zhaoyang Wu,Xin Liu,Guangqiang Li,Yawei Li
In this work, Fe–Si/Fe 2 SiO 4 soft magnetic composites (SMCs) are prepared successfully via sintering Fe-6.5 wt%Si/α-Fe 2 O 3 core-shell composite powders obtained by ball milling. The transformation mechanism from Fe-6.5 wt%Si/α-Fe 2 O 3 to Fe–Si/Fe 2 SiO 4 is revealed in detail. The effect of α-Fe 2 O 3 coating content on microstructure and magnetic properties for the Fe–Si/Fe 2 SiO 4 SMCs is also investigated. During the high temperature sintering process, α-Fe 2 O 3 coating will in situ react with diffused Si from Fe–Si alloy cores, and result in the generation of Fe 2 SiO 4 insulating layer and Fe atoms. When the α-Fe 2 O 3 coating content increases from 0.0 wt% to 7.5 wt%, the insulating layer becomes thicker. Nevertheless, with further increasing the α-Fe 2 O 3 coating content from 7.5 wt% to 12.5 wt%, the generation of excessive Fe breaks the continuity of the insulation layer. As a result, the saturation magnetization decreases gradually, while the coercivity exhibits an opposite trend. The core loss decreases firstly and then increases. Therefore, the Fe–Si/Fe 2 SiO 4 SMCs coated with 7.5 wt% α-Fe 2 O 3 exhibit superior comprehensive performance such as very low core loss (39.6 mW/cm 3 at 50 kHz), very high saturation magnetization (191.4 emu/g) and stable permeability (44) from 50 Hz to 200 kHz.
研究领域:
材料科学
·
物理学
✓ 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）