CHEMISTRY-A EUROPEAN JOURNAL
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2018
·Vol. 25
·期 9
·2330-2336
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IF 5.16
Jing Liu,Xiuxia Zhao,Peng Jing,Wei Shi,Peng Cheng
Graphical Green hybrid : A Z-Scheme system, g-C 3 N 4 /α-Fe 2 O 3 , was synthesized by a MOF-derived template method. The optimized system shows excellent photocatalytic hydrogen evolution performance with visible light response. As one of the most efficient systems for photocatalytic hydrogen evolution, the Z-Scheme system, consisting of different semiconductors with a reversible donor–acceptor pair, has attracted great attention. Considering the non-toxicity and low cost of photocatalysts, a series of g-C 3 N 4 /α-Fe 2 O 3 hybrids were rationally constructed based on the Z-Scheme mechanism for the first time, using a metal-organic framework template approach that can fine tune the compositions and properties of the hybrids. An optimized hybrid, g-C 3 N 4 /α-Fe 2 O 3 -2, exhibited prominent photocatalytic water splitting performance with a visible light response. Under irradiation of visible light ( λ >420 nm), the hybrid shows a high durability and superior hydrogen production rate of 2066.2 μmol g −1 h −1 from water splitting, which is approximately three times greater than that of bulk g-C 3 N 4 because of the effective separation of photo-excited charge carriers by two narrow band gap semiconductors, tightly coupled with the Z-Scheme structural feature.
研究领域:
材料科学
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化学
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可再生能源
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产品关联
DOI
PubMed
高影响因子
Antibiotics-Basel
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2022
·Vol. 11
·期 9
·1252
·
IF 5.222
Samar Zuhair Alshawwa,Eman J. Mohammed,Nada Hashim,Mohamed Sharaf,Samy Selim,Hayaa M. Alhuthali,Hind A. Alzahrani,Alsayed E. Mekky,Mohamed G. Elharrif
In the present study, we utilizedStevia rebaudianaL. (SRLe) extract to in situ biosynthesize nanoscale alpha hematite (α-Fe2O3) nanoparticles (NPs) with potent antioxidant, antimicrobial, and anticancer properties. SRLe-α-Fe2O3was characterized using physiochemical analyses, including UV/Vis, FTIR, XRD, DLS, EDX, SEM, and TEM studies. Among tested solvents, CHCl3/MeOH (2:1v/v) SRL extract (least polar solvent) contained the highest EY, TPC, and antioxidant capacity of ~3.5%, ~75 mg GAE/g extract, and IC50= 9.87 ± 0.7 mg/mL, respectively. FTIR confirmed the engagement of coating operation to the colloidal α-Fe2O3NPs. TEM, SEM, and DLS revealed that SRLe-α-Fe2O3has a spherical shape, uniform size distribution with aggregation for an average size of ~18.34 nm, and ζ = −19.4 mV, forming a repulsive barrier that helped to improve stability. The synthesized nanoparticles displayed considerable antibacterial activity againstE. coliandS. aureusbacterial growth, and exhibited superior activity against the A549 lung cancer cell lines. These findings indicate that the increased availability of bioactive substances with antioxidant properties of SRLe makes it a potentially interesting material for the preparation of biologically active compounds and green synthesis of nanoparticles.Keywords:Stevia rebaudianaL.;IONP green synthesis;antioxidant;cytotoxic;antitumor;extraction yield
研究领域:
生物化学
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纳米医学
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植物学
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DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2012
·
IF 4.525
Wei Wu,Shaofeng Zhang,Xiangheng Xiao,Juan Zhou,Feng Ren,Lingling Sun,Changzhong Jiang
Mesoporous spindlelike iron oxide/ZnO core–shell heterostructures are successfully fabricated by a low-cost, surfactant-free, and environmentally friendly seed-mediate strategy with the help of postannealing treatment. The material composition and stoichiometry, as well as these magnetic and optical properties, have been examined and verified by means of high-resolution transmission electron microscopy and X-ray diffraction, the thickness of ZnO layer can be simply tailored by the concentration of zinc precursor. Considering that both α-Fe2O3 and ZnO are good photocatalytic materials, we have investigated the photodegradation performances of the core–shell heterostructures using organic dyes Rhodamin B (RhB). It is interesting to find that the as-obtained iron oxides/ZnO core–shell heterostructures exhibited enhanced visible light or UV photocatalytic abilities, remarkably superior to the as-used α-Fe2O3 seeds and commercial TiO2 products (P25), mainly owing to the synergistic effect between the narrow and wide bandgap semiconductors and effective electron–hole separation at the interfaces of iron oxides/ZnO.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
ELECTROCHEMISTRY
·
2025
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IF 1.7
Hongyu CHEN,Ru TIAN,Jianke LI,Beibei HAN,Guoku LIU,Shiyu YIN,Guiying XU,Kun WANG,Fukuan WANG,Baigang AN,Dongying JU,Weimin ZHOU
TiO2 as a semiconductor photocatalyst has been extensively utilized in the purifications of water and air. However, the wide band gap of TiO2 necessitates its activation by ultraviolet irradiation, when it is utilized as a photocatalyst. To enhance the photocatalyst performance of TiO2, constructing the heterojunction containing TiO2 is considered as a highly effective method. To unfold the actual application, iron metal oxides are firstly utilized to construct the heterojunction of TiO2/α-Fe2O3, and the synthesized TiO2/α-Fe2O3 heterojunction was successfully coated on the surface of coal tar pitch based spherical activated carbons (CTP-SACs). The structures of TiO2/α-Fe2O3/CTP-SACs are verified by the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The results of UV-vis absorption spectroscopy supports that TiO2/α-Fe2O3/CTP-SACs are promising candidates for the natural light photoncatalysis. It is believed that the exceptional conductivity of CTP-SACs enhances the activity of the photocatalyst, resulting in the TiO2/α-Fe2O3/CTP-SACs exhibiting remarkable sterilization effects under natural light. For instance, the TiO2/α-Fe2O3-60-CTP-SAC shows an excellent sterilization rate (89 %) for the fish culture water under the irradiation of natural light for 20 min. Associating with the excellent liquidity of CTP-SACs, it is considerable that TiO2/α-Fe2O3/CTP-SACs possess the captivating application prospects in a field of the feeding water treatment.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2020
·
IF 3.784
Liya Fan,Xiao Zhang,Chuanqun Zhang,Jiangshan Li,Chenglin Wu,Yuxiao Chu,Fangqi Ge,Yiyuan Liu,Xianqiang Xiong
Developing highly stable and broad spectrum responsive semiconductor photoelectrode materials without the use of hole scavengers is challenging for photoelectrochemical protection application. In this study, α-Fe 2 O 3 /NiFe(OH) x electrodes were successfully prepared by combining hydrothermal method and simple drop-casting technique. The morphology, structure, composition and optical property of the obtained electrodes were well characterized by SEM, XRD , XPS and UV–vis DRS . α-Fe 2 O 3 /NiFe(OH) x electrode exhibited enhanced photocathodic protection performance as compared to hematite (α-Fe 2 O 3 ) electrode, and greatly shift photo potential and self-corrosion potential of the coupled 304 stainless steel into a more negative region. Remarkably, under visible light illumination, the prepared electrodes can protect the 304 stainless steel without the use of hole scavengers. Meanwhile, the photoanodes can maintain a better photo-stability without losing its activity. The possible mechanism for the enhanced photocathodic protection performance is proposed, which is involved with the fast hole transfer from hematite to NiFe(OH) x cocatalyst and generates high valence state Ni species to drive the water oxidation reaction. The reduced charge recombination will result in the effective electron transfer from the α-Fe 2 O 3 /NiFe(OH) x electrode to the 304 stainless steel and realize the effective protection.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 13
·2156-2164
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IF 7.411
Feng Li,Jing Li,Jie Zhang,Lili Gao,Xuefeng Long,Yiping Hu,Shuwen Li,Jun Jin,Jiantai Ma
Graphical Dope to promote : A high-performance photoanode consisting of NiO nanoparticles anchored on a gradient P-doped α-Fe 2 O 3 nanorod array (NiO/P-α-Fe 2 O 3 ) is successfully fabricated. The electrochemical results show that the photoanode presents a high photocurrent density and long-term stability for improved water oxidation. The photoelectrochemical (PEC) water-splitting efficiency of a hematite-based photoanode is still far from the theoretical value due to its poor surface reaction kinetics and high density of surface trapping states. To solve these drawbacks, a photoanode consisting of NiO nanoparticles anchored on a gradient phosphorus-doped α-Fe 2 O 3 nanorod (NR) array (NiO/P-α-Fe 2 O 3 ) was fabricated to achieve optimal light absorption and charge separation, as well as rapid surface reaction kinetics. Specifically, a photoanode with the NR array structure allowed a high mass-transport rate to be achieved, while phosphorus doping effectively decreased the number of surface trapping sites and improved the electrical conductivity of α-Fe 2 O 3 . Furthermore, the p–n junction that forms between NiO and P-α-Fe 2 O 3 can further improve the PEC performance due to efficient hole extraction and the water oxidization catalytic activity of NiO. Consequently, the NiO/P-α-Fe 2 O 3 NR photoanode produced a high photocurrent density of 2.08 mA cm −2 at 1.23 V versus a reversible hydrogen electrode and a 110 mV cathodic shift of the onset potential. This rational design of structure offers a new perspective in exploring high-performance PEC photoanodes.
研究领域:
材料科学
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能源研究
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2017
·
IF 3.582
Yu-pei Li,Fa-tang Li,Xiao-jing Wang,Jun Zhao,Jiang-nan Wei,Ying-juan Hao,Ying Liu
A quantum-sized hematite iron oxide (α-Fe 2 O 3 )/graphitic carbon nitride (g-C 3 N 4 ) hybrids have been designed and constructed through a facile in situ calcination treatment. The α-Fe 2 O 3 /g-C 3 N 4 hybrids were analyzed via various characterization techniques including XRD , TEM , UV–Vis DRS , XPS , and their photocatalytic efficiencies were evaluated by visible light-driven hydrogen evolution . The results reveal that the cooperation of α-Fe 2 O 3 and g-C 3 N 4 during fabrication process leads to synergy effects of not only the morphology but also the microstructure. These hybrids exhibit much higher hydrogen evolution efficiency than pure g-C 3 N 4 under visible-light illumination due to their improved light harvesting capability, enhancement of surface areas , predominant (110) facet exposure of α-Fe 2 O 3 as well as a prominent quantum size effect , and highly efficient electron transfer and separation. A proposed Z-scheme mechanism was further verified experimentally.
研究领域:
材料科学
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光催化
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纳米材料
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能源化学
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半导体物理
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表面科学
✓ 已验证
DOI
高影响因子
RSC Advances
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2021
·Vol. 11
·期 39
·24065-24071
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IF 3.361
Min Feng,Shaohua Wen,Xiaofang Chen,Die Deng,Xiupei Yang,Run Zhang
Hydroquinone (HQ) is poorly degradable in the ecological environment and is highly toxic to human health even at a low concentration. The colorimetric method has the advantages of low cost and fast analysis, which provides the possibility for simple and rapid detection of HQ. In this work, a new colorimetric method has been developed for HQ detection based on a peroxidase-like catalyst, α-Fe2O3@CoNi. This sweetsop-like α-Fe2O3@CoNi catalyst enables H2O2 to produce hydroxyl (˙OH), leading to the oxidization of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue oxTMB. In the presence of HQ, the blue oxTMB is reduced to colorless, which allows for colorimetric detection of HQ in water samples. This method has been validated by detecting HQ in water samples with high selectivity, rapid response, broad detection range (0.50 to 30 μM), and low detection limit (0.16 μM).
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
·
IF 8.6
Junfei Liu,Yue Zhang,Yingbo Dong,Zeyi Jiang,Liping Zhang,Wei Liu,Jing Guan,Hai Lin
In this study, a novel α-Fe 2 O 3 /V 2 O 5 /BC catalyst with high peroxymonosulfate (PMS) activation performance was constructed by co-pyrolysis method and 99.58% of tetracycline is degraded within 120 min. The electrons conversion of Fe-V on biochar surface induces the continuous generation of sulfate radical and singlet oxygen molecules ( 1 O 2 ). The XPS results show that it is Fe 3+ and Fe 0 rather than Fe 3+ and Fe 2+ in the iron cycle after the introduction of vanadium, indicating a more efficient electron transfer efficiency between interface. The optical properties characterization and density function theory calculation (DFT) of α-Fe 2 O 3 /V 2 O 5 /BC reveal that the electrons of the entire α-Fe 2 O 3 and the vanadium atoms are redistributed to new molecular orbitals due to strong interfacial chemical bonding, inducing a direct transfer of electrons to generate 1 O 2 for tetracycline removal that is the main cause of selective degradation. Besides, the possible degradation mechanism and tetracycline degradation pathways were also proposed. The α-Fe 2 O 3 /V 2 O 5 /BC maintains a high removal efficiency of tetracycline only decrease by 7.09% after six cycles. This study provides a better strategy and recyclable purification material for the efficient treatment of antibiotic pharmaceutical wastewater.
研究领域:
环境科学
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材料科学
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废水处理
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2015
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IF 4.642
Jun Liu,Shuanglei Yang,Wei Wu,Qingyong Tian,Shuyuan Cui,Zhigao Dai,Feng Ren,Xiangheng Xiao,Changzhong Jiang
The 3D flowerlike α-Fe2O3@TiO2 core–shell nanocrystals with thorhombic, cubic, and discal morphologies are synthesized for photocatalytic application. α-Fe2O3 nanocrystals were prepared via a Cu2+, Zn2+, and Al3+ ion-mediated hydrothermal route. The α-Fe2O3@TiO2 core–shell nanocrystals are obtained via a hydrothermal and annealing process. The shape-dependent photocatalytic activities of these as-obtained α-Fe2O3@TiO2 core–shell nanocrystals are measured. The results reveal that the discal α-Fe2O3@TiO2 nanocrystals exhibit the best photocatalytic activity relative to the other two core–shell nanocrystals because the discal α-Fe2O3 nanocrystals possess more rough surface and surface defects. The fast interfacial charge-transfer process and the wide spectral response could be the driving force for the enhanced photocatalytic performance. These core–shell architectures provide a positive example for synthesis of novel composite nanomaterial.
研究领域:
材料科学
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纳米技术
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光催化
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化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23607-23620
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IF 7.443
Zhifeng Jiang,Deli Jiang,Wei Wei,Zaoxue Yan,Jimin Xie
In this work, we fabricated size-tunable metal (Pd, Ag) nanoparticles grafted on bionic dendritic α-Fe2O3 (M@Fe2O3) through an in situ growth method by using carbon nanodots as a reducing agent followed by a hydrothermal reaction. The size of the supported noble metal nanoparticles can be directly controlled on the surface of dendritic α-Fe2O3 by adjusting the added amount of noble metal salts. The catalytic performances of the resulting M@Fe2O3 hybrid composites were firstly evaluated by reduction of p-nitrophenol. The results indicated that the size of the noble metal nanoparticles had a crucial influence on the catalytic behaviors of the M@Fe2O3. In addition, the dendritic M@Fe2O3 also showed improved photocatalytic efficiencies for visible-light-driven MB degradation due to synergic effects between dendritic α-Fe2O3 and noble metal nanoparticles, including optical properties, unique structure, good dispersion, good charge separation and the SPR effect. The M@Fe2O3 composites have good reproducibility and are highly stable for p-nitrophenol reduction/degradation of MB. Our strategy can be extended to a general strategy for the formation of other novel composites consisting of a 3D hierarchical metal oxide and noble metal nanoparticles with tailorable size (e.g., Pt@TiO2, Pd@MnO2, Au@ZnO and Ag@Cu2O) for broad applications in water treatment.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 54
·31121-31128
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IF 2.936
Feng-Xia Liang,Lin Liang,Xing-Yuan Zhao,Xiao-Wei Tong,Ji-Gang Hu,Yi Lin,Lin-Bao Luo,Yu-Cheng Wu
In this work, we reported the utilization of mesoporous α-Fe2O3 films as optical sensors for detecting organic vapors. The mesoporous α-Fe2O3 thin films, which exhibited obvious Fabry–Perot interference fringes in the reflectance spectrum, were successfully fabricated through electrochemical anodization of Fe foils. Through monitoring the optical thickness of the interference fringes, three typical organic species with different vapor pressures and polarities (hexane, acetone and isopropanol) were applied as probes to evaluate the sensitivity of the α-Fe2O3 based interferometric sensor. The experiment results showed that the as-synthesized mesoporous α-Fe2O3 interferometer displayed high reversibility and stability for the three organic vapors, and were especially sensitive to isopropanol, with a detection limit of about 65 ppmv. Moreover, the photocatalytic properties of α-Fe2O3 under visible light are beneficial for degradation of dodecane vapor residues in the nano-pores and refreshment of the sensor, demonstrating good self-cleaning properties of the α-Fe2O3-based interferometric sensor.
研究领域:
材料科学
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光学传感
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化学传感器
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纳米技术
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环境监测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）