CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Feifei Wang,Xiaolin Yu,Maofa Ge,Sujun Wu
A series of TiO 2 and γ-Fe 2 O 3 co-doped graphene oxide (GO) nanosheets ( x TiO 2 /γ-Fe 2 O 3 /GO) were prepared by a facile self-assembly method. The characterization results show that the x TiO 2 /γ-Fe 2 O 3 /GO have the advantages of narrow band gap energies (<2.47 eV), and high structure stability. The incorporation of TiO 2 into γ-Fe 2 O 3 /GO composite dramatically enhances the catalytic activity, and the 0.03TiO 2 /γ-Fe 2 O 3 /GO composite exhibits the highest catalytic efficiency (99%) for ciprofloxacin (CIP) degradation (10 mg/L, 50 ml) within 140 min under visible light, which is ~1.5 times higher than that of γ-Fe 2 O 3 /GO composite without TiO 2 . Furthermore, the photo-Fenton like mechanism was proposed by quenching experiment and electrochemistry method. The intermediates of the CIP degradation were analyzed by the assistance of LC-MS technology, which provides insight into the pathway of CIP degradation.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2019
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IF 6.361
Chao Wang,Ming Yang,Lihong Liu,Yingming Xu,Xianfa Zhang,Xiaoli Cheng,Shan Gao,Yuan Gao,Lihua Huo
In order to enhance the gas response of polypyrrole to NO 2 , the polypyrrole/Fe 2 O 3 nanocomposites are synthesized by one-step hydrothermal route. The presence of ferric oxide in composites is demonstrated by XPS, HRTEM and TG analyses. The polypyrrole/Fe 2 O 3 sensor exhibits high selectivity and response to NO 2 at 50 °C. Compared with other polypyrrole/metal oxide materials, the polypyrrole/Fe 2 O 3 materials are easy to be synthesized, and the gas sensor has a higher response of 220.7%, lower detection limit of 0.1 ppm and good linear relationship when the NO 2 concentrations range from 0.1 ppm to 10 ppm. The gas response is greatly improved in comparison with the pure polypyrrole and Fe 2 O 3 . The reason for the improved response is also discussed.
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ACS Catalysis
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2018
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IF 11.384
Yizhou Wu,Jesse Ward-Bond,Donglin Li,Shaohua Zhang,Jiafu Shi,Zhongyi Jiang
Graphitic carbon nitride (g-C3N4) is an emergent metal-free photocatalyst because of its band position, natural abundance, and facile preparation. Synergetic intensification of charge generation and charge transfer of g-C3N4 to increase solar-to-chemical efficiency remains a hot yet challenging issue. Herein, a nanoshell with two moieties of α-Fe2O3 and carbon (C) is in situ formed on the surface of a g-C3N4 core through calcination of Fe3+/polyphenol-coated melamine, thus acquiring g-C3N4@α-Fe2O3/C core@shell photocatalysts. The α-Fe2O3 moiety acts as an additional photosensitizer, offering more photogenerated electrons, whereas the C moiety bridges a “highway” to facilitate the electron transfer either from α-Fe2O3 moiety to g-C3N4 or from g-C3N4 to C moiety. By tuning the proportion of these two moieties in the nanoshell, a photocurrent density of 3.26 times higher than pristine g-C3N4 is obtained. When utilized for photocatalytic regeneration of reduced nicotinamide adenine dinucleotide (NADH, a dominant cofactor in biohydrogenation reaction), g-C3N4@α-Fe2O3/C exhibits an equilibrium NADH yield of 76.3% with an initial reaction rate (r) of 7.7 mmol h–1 g–1, among the highest r for photocatalytic NADH regeneration ever reported. Manipulating the coupling between charge generation and charge transfer may offer a facile, generic strategy to improve the catalytic efficiency of a broad range of photocatalysts other than g-C3N4.
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ELECTROCHIMICA ACTA
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2018
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IF 5.116
Guijuan Wei,Xixia Zhao,Kun Du,Yiwen Huang,Changhua An,Shujun Qiu,Miao Liu,Shuang Yao,Yue Wu
Flexible asymmetric supercapacitors (FASCs) have attracted increasing interest in portable and wearable electronics. The practical application of FASCs in high energy density devices is limited by their low specific capacity, which can be effectively addressed by designing electrode materials hierarchically on the micro-nanoscale. Herein, well-defined 3D porous hierarchical CuCo 2 O 4 @carbon quantum dots (CQDs) and Fe 2 O 3 @CQDs architectures are rationally synthesized through a simple CQDs-induced hydrothermal self-assembly technique. Both of the as-prepared CuCo 2 O 4 @CQDs and Fe 2 O 3 @CQDs electrodes exhibit improved specific capacity, desirable rate capability and complementary potential range. A FASC (CuCo 2 O 4 @CQDs//Fe 2 O 3 @CQDs) on graphite paper delivers a high operation voltage of 1.55 V, an energy density of 39.5 Wh kg −1 at 1203.7 W kg −1 , and long cycling lifespan. The excellent performance is ascribed to the good electronic conductivity with the assistance of CQDs and their unique 3D mesoporous structures with extraordinary specific surface area, which could provide fruitful active sites for electrochemical reactions . The newly developed FASC based on the Faradaic-type electrodes is inspiring, and would be promising for the applications in wearable electronic devices.
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FUEL
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2018
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IF 4.908
Yu Chen,Xin Guo,Fan Wu,Yu Huang,Zhanchi Yin
Hematite (α-Fe 2 O 3 ) has been proved to be a promising sorbent for mercury removal in various situations. The mercury removal performance of α-Fe 2 O 3 was investigated using a simulated coal gasification syngas containing Hg 0 , N 2 , HCl, and/or H 2 S, a series of experiments were designed with HCl and H 2 S separately and both employed. For a better understanding in the interaction between HCl and H 2 S in mercury removal, the differences in mercury oxidation were demonstrated on the basis of density functional theory calculations. The rate-limiting step in HgCl 2 formation is Hg 0 → HgCl with the energy barrier of 139.47 kJ/mol, but for H 2 S in mercury oxidation, the generation of active sulfur species is the key step and the rate-limiting step is detachment of second H with an energy barrier of 57.53 kJ/mol. Experimental results point that HCl has inhibition on H 2 S for mercury removal, it may be ascribed to the competition of active Fe sites on Fe 2 O 3 . Conversely, HCl contributes to the mercury oxidation at high temperature while H 2 S has a limit effect at elevated temperature.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
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IF 5.091
Ling Cheng,Yulu Tian,Jingdong Zhang
A p-n heterojunction film of Cu 2 O/α-Fe 2 O 3 was constructed by electrodepositing p-type Cu 2 O microcubes on liquid phase deposited film of n-type α-Fe 2 O 3 . The surface morphology , the crystal phase and composition of Cu 2 O/α-Fe 2 O 3 heterojunction film were characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The enhanced absorption in the visible light region was observed in UV–visible diffuse reflectance spectra. Meanwhile, an efficiently improved separation and faster transfer of photogenerated electrons and holes were revealed by photoluminescence spectra and electrochemical impedance spectra. The Cu 2 O/α-Fe 2 O 3 p-n heterojunction was applied to photoelectrocatalytic degradation of oxytetracycline at a bias potential of +0.5 V under visible light illumination. After 60-min photoelectrocatalytic treatment, 73.3% of oxytetracycline was removed and the degradation rate constant reached 2.14 × 10 −2 min −1 . Moreover, the crystal phases and compositions for the used and fresh Cu 2 O/α-Fe 2 O 3 films were studied, and a possible photoelectrocatalytic mechanism was proposed.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2013
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IF 3.172
Shaofeng Zhang,Feng Ren,Wei Wu,Juan Zhou,Lingling Sun,Xiangheng Xiao,Changzhong Jiang
Composite photocatalysts that consist of semiconductor and noble metal nanostructures have been considered to be the promising and crucial materials for straightforward improving the efficiency in photocatalytic process and for the conversion of solar to chemical energy. In this work, we fabricated Ag-α-Fe 2 O 3 hybrid composites through a self-catalytic growth method by using the aldehyde-modified spindle α-Fe 2 O 3 nanoparticles (NPs) as supports. The size of supported Ag NPs can be directly controlled on the surface of α-Fe 2 O 3 . The morphology and structure of the resulting Ag-α-Fe 2 O 3 hybrid composites were studied by various techniques, including SEM, TEM, and XRD. The distinct photocatalytic behaviors were examined through the photodegradation of RhB dye. It was found that with the Ag NPs, the photocatalytic activities were enhanced greatly and the size of the Ag NPs played a crucial influence on the photocatalytic behaviors of the Ag-α-Fe 2 O 3 composites.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Fan Yang,Tian Qiu,Cheng Chi,Shuang Liang,Lei Deng,Xuyang Wang,Chunxia Wang,Jingyi Fu,Ying Wang,Yongfeng Li
Promotion of nitrogen-doped graphene (NG) by incorporation of ferric oxide (NG-Fe 2 O 3 ) is found to strongly enhance the activity in the catalytic oxidization of aldehyde to synthesize carboxylic acid with O 2 . The composite NG-Fe 2 O 3 catalysts can be fabricated by a facile one-pot hydrothermal method. The characterization results of the composite catalysts have revealed that the Fe 2 O 3 nanoparticles (NPs) with sizes of 40–90 nm are not only on both sides of NG sheets but also tightly enwrapped by the graphene layers. In comparison to NG and Fe 2 O 3 NPs, synergistic adsorption that confirmed by DFT studies has been created on the NG-Fe 2 O 3 composites, where both NG and Fe 2 O 3 are proposed to be involved in the adsorptive interaction. The synergistic adsorption can lead to strengthen O 2 molecule adsorption of NG and weaken O 2 molecule adsorption of Fe 2 O 3 NPs. More importantly, the NG-Fe 2 O 3 composite is found to considerably facilitate the longest elongation of O-O bonds and contribute to the striking enhancement of the catalytic performance. The highly active NG-Fe 2 O 3 composite shows wide scope for catalysis of oxidation of aldehydes to carboxylic acids and good stability for recycle six times.
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MATERIALS CHEMISTRY AND PHYSICS
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2017
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IF 2.084
Li Cheng,Shoufei Qiu,Juanrong Chen,Jian Shao,Shunsheng Cao
Shifting the ultra-violet of titania to visible light driven photocatalysis can be realized by coupling with metallic or non-metallic elements. However, time-consuming multi-step process and significant loss of UV photocatalytic activity of such TiO 2 -based photocatalysts severely hinder their practical applications. In this work, we explore the idea of creating a practical method for the preparation of Fe 2 O 3 decorated TiO 2 (TiO 2 /Fe 2 O 3 ) photocatalyst with controlled visible-light photoactivity. This method only involves the calcination of the mixture (commercial P25 powders and magnetic Fe 3 O 4 nanoparticles) prepared by a mechanical process. The morphology and properties of TiO 2 /Fe 2 O 3 composites were characterized by Transmission electron microscope , X-ray diffraction, UV–vis spectroscopy, and X-ray photoelectron spectroscopy. Results confirm the fusion of TiO 2 and Fe 2 O 3 , which promotes photo-generated electrons/holes migration and separation. Because of the strong synergistic effect, the as-synthesized TiO 2 /Fe 2 O 3 composites manifest an enhanced visible-light photocatalytic activity. Especially, the TiO 2 /Fe 2 O 3 photocatalyst is very easy to be constructed via an one-step protocol that efficiently overcomes the time-consuming multi-step processes used in existed strategies for the preparation of Fe 2 O 3 /TiO 2 photocatalysts, providing a new insight into the practical application of TiO 2 /Fe 2 O 3 visible light photocatalyst.
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CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Rubin Zeng,Zhongjie Shen,Haigang Zhang,Yuxiang Cheng,Qinfeng Liang,Haifeng Liu
High-temperature sintering and solid-state reaction within the intricate Fe 2 O 3 /CaO system are pivotal factors influencing material characteristics. The current work focused on the sintering and reaction behavior of Fe 2 O 3 /CaO particles at high temperatures with a multiscale study of in-situ high-temperature stage microscopy (HTSM) and molecular dynamics (MD). The laws governing atomic migration and the evolution of crystal structure during the sintering process were simulated at the nanoscale. The results elucidated that a heightened heating rate fosters particle shrinkage and concomitant reduction in surface area. The sintering activation energy ( E sin ) exhibited an increment proportional to the linear shrinkage of the particles. Furthermore, an augmented potential barrier in advanced stages impeded subsequent sintering behavior. Augmented temperature promoted the particle shrinkage and sintering neck formation, culminating in pore closure and a diminution in the free surface. However, this promotional effect attenuated with escalating temperatures. Particle shrinkage and sintering neck formation are contingent upon atomic migration and diffusion, with the growth of sintering necks primarily reliant on atom diffusion along the surface of the sintering necks. The atomic diffusion activation energy was determined to be 49.5 kJ/mol within the temperature range of 1073–1473 K. Within the Fe 2 O 3 /CaO system, the preferential generation of Ca 2 Fe 2 O 5 (C2F) over CaFe 2 O 4 (CF) was found, leading to a decrease in the atomic diffusion barrier and an enhancement of the diffusivity, with the latter dominating in later stages. The highest mobility of O 2– , Fe 3+ , and Ca 2+ was discerned in CF, and the sintering shrinkage of the particles predominantly hinges on the generation of CF.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Longxin Wang,Yishan Wang,Dongdong Liu,Xuji Zhang,Guangwu Wen,Xueqian Zhang,Xiaoxiao Huang
In order to improve the weak dielectric loss capability and poor impedance matching of Fe 3 O 4 , the hexagonal plates of Fe 3 O 4 /Fe 2 O 3 /C nanocomposites were rationally constructed in this paper by utilizing electrostatic attraction and cross-linking, using polyacrylamide (PAM) as templating agent and viscosity modifier. The stacked hexagonal plates constructed a conductive network and utilized the structural properties of Fe 3 O 4 to promote the transfer and jump of free electrons, which effectively improved the conduction loss. The heterogeneous interface was effectively constructed due to the presence of Fe 2 O 3 and trace carbon, while the transfer and leap of free electrons promoted the generation of interfacial polarization, resulting in magnetoelectric coupling and effective improvement of polarization loss. The results show that the effective absorption broadband reaches 4.08 GHz when the matching thickness of the composite is 2 mm. A minimum reflection loss of −43.79 dB is realized at a matching thickness of 1 mm. The PAM modification proved to be an effective means to modulate the morphology and composition of the materials.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Li Li,Caimin He,Wenyang Lei,Pingping Gao,Ting Lei
It is of great importance to rationally develop and design cost-effective, high durable and non-noble metal catalysts for electrocatalytic water splitting. Here, self-supported well-defined crystalline iron oxides hybrid (FeO x /IF) was successfully fabricated by facile in-situ thermal air oxidation of iron foam. An investigation into the effects of thermal oxidation temperature on the crystalline structure and surface appearance of FeO x /IF was studied. The resultant FeO x /IF-550 reveals nanoarrays morphology composed of Fe 2 O 3 and Fe 3 O 4 hybrid with Fe 2 O 3 and Fe 3 O 4 heterojunctions , which exhibits remarkably superior catalytic activity towards HER with a low overpotential of only 98 mV to drive a current density of 10 mA cm −2 in alkaline solution. Meanwhile, FeO x /IF-550 exhibits good durability with negligible attenuation of overpotential at a large current density of 500 mA cm −2 for 24 h in alkaline solution. The excellent HER performance of FeO x /IF is mainly attributed to the synergistic effect of Fe 2 O 3 and Fe 3 O 4 , increased accessible active sites and accelerated charge transfer. The present study provides new insights into the design of cost-effective electrocatalysts with high activity and excellent stability for industrialization.
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