SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Qilu Cheng,Hui Jiang,Zhuo Jin,Ying Jiang,Cai Hui,Ligen Xu,Yuhua Zhao,Linna Du
In this study, the impact of Fe 2 O 3 nanoparticles (nFe 2 O 3 ) on microbial extracellular polymeric substances (EPS) and nonylphenol (NP) degradation in sediment were investigated. The results showed that the addition of nFe 2 O 3 lowered the degree of EPS overproduction and the amount of polysaccharides and proteins secreted in NP contaminated sediment. Particularly, the secretion of colloidal EPS (C-EPS) lowered significantly ( P < 0.05), and the content of tyrosine-like, tryptophan-like, and soluble microbial by-product-like substances in C-EPS also decreased, leading to a lower aromaticity, humification, and hydrophobicity of C-EPS. Furthermore, with lower C-EPS content in water, NP was adsorbed to sediment more easily, and the weakened toxic effect of NP to bacteria as well as a higher proportion of organic matter degrading microbes stimulated NP degradation. These findings revealed the vital role of nFe 2 O 3 in alleviating NP toxicity to microbes and reducing NP ecological risk in aquatic environments.
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Catalysts
·
2021
·Vol. 11
·期 1
·82
·
IF 4.146
Chuang Li,Dan Wang,Jiangli Gu,Yichun Liu,Xintong Zhang
Surface electron traps on semiconductor photoanodes mediate surface recombination and deteriorate the photoelectrochemical (PEC) water oxidation performance of the photoanode. Developing convenient methods to reduce surface electron traps is therefore essential for high efficiency PEC water oxidation on semiconductor photoanodes, particularly for nanostructured photoanodes with large surface area. Herein, we employ a O2plasma treatment to boost the PEC water oxidation performance of Ti-doped Fe2O3(Ti-Fe2O3) nanowires photoanodes, aiming to reduce surface oxygen vacancies, the dominant electron traps on Ti-Fe2O3surface. X-ray diffraction (XRD), scanning electron microscopy and spectroscopic analyses show that the oxygen plasma treatment changes the structural, morphological and optical properties negligibly, but it does reduce the content of surface oxygen vacancies, as estimated from O1s X-ray photoelectron spectroscopy spectra. An optimal O2plasma treatment (200 W, 70 s) increases the photocurrent density of the Ti-Fe2O3nanowire photoanode to 2.14 mA·cm−2(1.23 V vs. RHE) under air mass 1.5G simulated solar light, which is 1.95 times higher than the pristine Ti-Fe2O3nanowire photoanode. The surface hole transfer efficiency is also improved by 1.66 times due to the reduced surface recombination. The work suggests that O2plasma treatment is a convenient but effective method to boost the PEC water oxidation performance of Ti-Fe2O3photoanode and might be applicable to other semiconducting oxide photoanodes for high efficiency PEC water splitting.Keywords:photoelectrochemical water splitting;O2plasma treatment;surface oxygen vacancies;Ti-doped hematite nanowire arrays
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Arabian Journal of Chemistry
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2020
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IF 4.762
Kechen Song,Shuo Wang,Qiang Sun,Deping Xu
Nano-sheets Al 2 O 3 supported CeO 2 -Fe 2 O 3 binary oxides were prepared by the vacuum impregnation method. The structural and textural properties were characterized by pertinent techniques, and the materials were evaluated as catalysts for the oxidative dehydrogenation of ethylbenzene with carbon dioxide (CO 2 -ODEB). The characterization results show that all samples maintain the hierarchical structure, and CeO 2 -like and Fe 2 O 3 -like solid solutions were formed when changing the Ce-to-Fe molar ratio. The catalytic performances indicate that CeO 2 -Fe 2 O 3 binary oxides were effective for CO 2 -ODEB, and the activity is determined by mobile oxygen, which can facilitate the dehydrogenation process. The DFT studies further identified the reaction pathway and rate-determining step. The inter-transmission of oxygen species and the presence of CO 2 refill the oxygen vacancies and restore the redox cycle of CeO 2 -Fe 2 O 3 binary oxides.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Yingni Yu,Jing Liu,Yingju Yang,Junyan Ding,Aijia Zhang
Iron oxide (Fe 2 O 3 ) has been used as an effective sorbent to remove various heavy metals due to its large adsorption capacity and low cost. The cadmium capture capability of Fe 2 O 3 sorbent was investigated in the simulated flue gas at the temperatures of 700–1100 °C. Fe 2 O 3 sorbent exhibited much better Cd adsorption capability than SiO 2 and Al 2 O 3 sorbents. The largest Cd adsorption capacity of Fe 2 O 3 sorbent was 86.7 mg/g at 700 °C. The XPS analysis demonstrated that Fe 3+ might partially participate in the cadmium adsorption process. A large quantity of CdO was generated and adsorbed on the Fe 2 O 3 surface. The density functional theory (DFT) calculations were used to determine the active sites and the involved mechanism of different cadmium species adsorption over Fe 2 O 3 sorbent. Cd, CdCl 2 , and CdO can be stably adsorbed on the Fe 2 O 3 surface with the adsorption energies of −40.64 kJ/mol, −237.42 kJ/mol, and −375.03 kJ/mol, respectively. The results illustrate that the Fe atoms are the essential active sites for cadmium species adsorption on Fe 2 O 3 surface. The orbital hybridization between cadmium atom and Fe site suggests that the strong interaction occurs during Cd adsorption process. Both physisorption and chemisorption mechanisms were responsible for the cadmium capture by Fe 2 O 3 sorbent.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2019
·
IF 4.175
Zhen Xiang,Baiwen Deng,Chuang Huang,Zhicheng Liu,Yiming Song,Wei Lu
High-performance electromagnetic wave (EMW) absorbing materials have been widely used in the wireless communication and electronic devices due to their important potentials in electromagnetic attenuation. However, it is difficult to develop carbon-based absorbers with thin thickness, lightweight, and low filler loading. In this work, rationally designed hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites were successfully realized for ultrathin, lightweight, and high-efficiency EMW absorbers. It showed that the composition, microstructure, and morphology of composites were tailored, which gave rise to the tunable magnetic behavior, porosity, and electromagnetic parameters. The rational design of composition and novel structure contributed to the optimization of the impedance match. The EMW attenuation was enhanced by the synergistic effects of the dielectric loss originated from the interfacial and dipole polarization, conductive loss stemmed from the 3D conductive network, and the magnetic loss derived from the eddy-current loss and ferromagnetic resonance. Accordingly, the hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with a low filling ratio of 20 wt% achieved an ultrathin matching thickness of 1.4 mm and a strong reflection loss of −63.6 dB. The substantially enhanced EMW absorbing performances were owing to the optimized impedance matching and enhanced attenuation capability. Therefore, this work can provide a paradigm for the design and synthesis of hollow nanosphere γ -Fe 2 O 3 /MWCNTs composites with an enhanced EMW absorption.
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ENVIRONMENTAL POLLUTION
·
2019
·
IF 5.714
Feifei Wang,Xiaolin Yu,Maofa Ge,Sujun Wu,Juan Guan,Junwang Tang,Xiao Wu,Robert O. Ritchie
A novel self-assembly method was developed to prepare a γ-Fe 2 O 3 /graphene oxide (GO) heterogeneous catalyst that showed excellent synergy between photocatalysis and Fenton-like reactions. The γ-Fe 2 O 3 /GO catalyst prepared on the iron plates demonstrated efficient and reproducible catalytic activities for water treatment . It takes only 80 min to degrade 50 mg L −1 methylene (MB) completely, which is the main non-biodegradable dye in wastewater from the textile industry . The heterogeneous catalyst is stable over a wide range of pH (from 2.0 to 10.2) for MB degradation, and can be easily extracted from solution and repeatedly used with little loss of catalytic activity. The high activity and stability of the catalyst system can be attributed to charge separation between γ-Fe 2 O 3 and GO, which could accelerate Fenton-like process and photocatalysis. In addition, the dominant reactive oxidant species responsible for the MB degradation, including the hydroxyl radicals (•OH) and holes (h + ), were trapped on the surface of the γ-Fe 2 O 3 /GO composite, as proved by a free-radical quenching experiment. The γ-Fe 2 O 3 /GO heterogeneous catalyst could potentially provide a solution for removal of non-biodegradable dyes from wastewater in the textile industry.
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ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Huai Liu,Xuejuan Cao,Junnan Wei,Wenlong Jia,Mengzhu Li,Xing Tang,Xianhai Zeng,Yong Sun,Tingzhou Lei,Shijie Liu,Lu Lin
It is challenging to effectively convert 5-hydroxymethylfurfural (HMF) to 2,5-diformylfuran (DFF), a flexible biobased building-block, over non-noble metal catalysts. In this contribution, Mn–Fe oxides were prepared and served as highly active catalysts for the selective oxidation of HMF to DFF. Among Mn–Fe oxides with varied Mn–Fe molar ratios, Mn6Fe1Ox showed the best catalytic activity and offered HMF conversion up to 97% with a DFF selectivity of 98% (110 °C, 5 h, and 1.5 MPa O2). It is revealed that the introduction of α-Fe2O3 resulted in significant enhancement in the amount of catalytic active sites (Mn4+–O2– pairs) and their activity in Mn6Fe1Ox for the dehydrogenation of HMF to DFF. Mn6Fe1Ox also was a robust catalyst that could be successively used at least six times without substantial loss in its catalytic activity. Furthermore, a facile two-step process for the conversion of fructose to DFF with a yield up to 80% was developed by the integration of dehydration and oxidation over Amberlyst-15 and Mn6Fe1Ox, respectively.
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Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 36
·11167-11176
·
IF 6.641
Lei Wang,Jie Zhang,Min Wang,Renchao Che
Benefiting from the assistance of an organic ligand, porous Fe2O3 microspheres tightly wrapped by reduced graphene oxides (Fe2O3@RGO) were synthesized via a facile one-step hydrothermal method. The assembled Fe2O3 microspheres with different morphologies and sizes can be effectively regulated by controlling the addition of the iron source. The as-synthesized Fe2O3 spheres gradually changed from solid, hollow to a final solid ball with decreasing sizes from 800 nm to 200 nm. Intrinsic dielectric properties and charge density distribution were characterized by vector network analysis (VNA) and off-axis electron holography. Owing to their unique structure design, better electron transport behavior and enhanced dielectric and interfacial polarization, RGO wrapped hollow Fe2O3 microspheres exhibit the best electromagnetic energy conversion ability. The maximum reflection loss can reach −48.1 dB and the effective absorption bandwidth cover is 5.28 GHz (10.48–15.76 GHz) at 2.5 mm. Tuning the thickness from 1 to 5 nm, the strongest reflection loss peaks can shift from high to low frequency, showing adjusting absorption properties.
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PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 44
·期 12
·1600-1607
·
IF 1.634
Daixiong Zhang,Rui Pei,Xiofei Peng,Qing Xiang,Xia Wang
In this study, nano-Al/Fe 2 O 3 bilayer was successfully formed via aqueous electrophoretic deposition (EPD) route for the first time. For this formation, the first layer of nano-Fe 2 O 3 was prepared by EPD using the bi-additive of 0.015 mM HCl+10 mg L −1 PEI, and then the second layer of nano-Al was immediately prepared by EPD using 5 mg L −1 PEI as additive. The electrophoretic nano-Al/Fe 2 O 3 bilayer had high heat release of ∼2800 J g −1 and exhibited good combustion performance. In comparison with the previous work realized by using organic-solvent-EPD, we believe this study can pave a new way for preparing the bilayers of nanothermites or metallic reactive materials by more cost-effective and environment-friendly aqueous EPD route.
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JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
·
2018
·Vol. 107
·期 3
·511-520
·
IF 3.373
Moyuan Qu,Wenqian Xiao,Jiarong Tian,Song Wang,Hong Li,Xue Liu,Xiaoling Yang,Bo Li,Xiaoling Liao
Nanofibrous poly( l -lactic acid) (PLLA) microspheres are extensively studied to be used as cell carriers in the field of tissue engineering because the unique structure can promote cell proliferation and migration. But as injectable scaffold materials, PLLA microspheres easily run off to the soft tissue space because of the lack of cohesive force. It will affect the treatment efficiency and even cause additional inflammatory response. In order to overcome this disadvantage, superparamagnetic γ-Fe 2 O 3 nanoparticles assisted with oxidative polymerization of dopamine were used for surface modification of PLLA microspheres in this study. The results showed that this surface modification had no obvious cytotoxicity, and the modified microspheres possessed the ability to carry seed cells to controllably move to the defect sites with the guidance of magnetic field, which may be able to increase the repair efficiency. Moreover, the characteristic nanofibrous structure was not destroyed after modification, which was able to promote biological activity of cells. This work provides a novel way to produce superparamagnetic nanofibrous microspheres designed for cell microcarriers. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2018. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 511–520, 2019.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Wang Zhifeng,Zhang Xiaomin,Zhao Yan,Li Meixian,Tan Taizhe,Tan Minghui,Zhao Zeren,Ke Chengzhi,Qin Chunling,Chen Zhihong,Wang Yichao
Due to the severe volume expansion and poor cycle stability, transition metal oxide anode is still not meeting the commercial utilization. We herein demonstrate the synthetic method of core-shell pomegranate-shaped Fe 2 O 3 /C nano-composite via one-step hydrothermal process for the first time. The electrochemical performances were measured as anode material for Li-ion batteries. It exhibits excellent cycling performance, which sustains 705 mAh g −1 reversible capacities after 100 cycles at 100 mA g −1 . The anodes also showed good rate stability with discharge capacities of 480 mAh g −1 when cycling at a rate of 2000 mA g −1 . The excellent Li storage properties can be attributed to the unique core-shell pomegranate structure, which can not only ensure good electrical conductivity for active Fe 2 O 3 , but also accommodate huge volume change during cycles as well as facilitate the fast diffusion of Li ion.
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ACS Catalysis
·
2019
·
IF 12.221
Yu Kang,Ming Tian,Chuande Huang,Jian Lin,Baolin Hou,Xiaoli Pan,Lin Li,Alexandre I. Rykov,Junhu Wang,Xiaodong Wang
It is of great significance to improve the syngas selectivity of Fe-based oxygen carriers (OCs), because of their sufficient lattice oxygen, low cost, and environmental compatibility in chemical looping partial oxidation of CH4. In this work, it was found that the addition of Y could remarkably increase CO selectivity of Fe2O3/Al2O3 to 98% with a CH4 conversion of ∼90%. X-ray diffraction (XRD) and transmission electron microscopy (TEM) characterizations combined with Mössbauer spectroscopy illustrated that the incorporation of Y led to the Fe species gradually transferring from Fe2O3 into the garnet structure (Y3Fe2Al3O12), a newly formed phase, which was found to be highly active for syngas generation. Density functional theory (DFT) calculations demonstrated that such a high CO selectivity of confined Fe species in garnet originated from enhanced oxygen vacancy formation energy (Eov), compared with Fe2O3, which resulted from the lattice oxygen shared by not only reducible Fe ions but also nonreducible Al and Y ones in a garnet structure. Therefore, our work provides a meaningful guidance of new materials screening for methane partial oxidation in the chemical looping process.
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