ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2016
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IF 5.393
Ting Liu,Lucheng Xue,Xin Guo,Jia Liu,Yu Huang,Chuguang Zheng
The reaction mechanisms of a mixture gas of HCl, O2, and SO2 in Hg0 adsorption on α-Fe2O3(001) surface are clarified by a group of adsorption experiments and theoretical calculations based on the density functional theory. The role of O2 in removing Hg0 is greatly influenced by the reaction temperature, meanwhile, the O atom coverage could affect the adsorption performance of Hg0. The dissociated O2 competes with the active sites of Cl species on Fe surface at low temperature, however, at medium temperature HCl and O2 could simultaneously facilitate the Hg0 transformation. Combined with the theoretical calculations, the role of SO2 and the probable pathways in removing Hg0 are discussed. Lower concentration of SO2 as well as HCl could dissociate on α-Fe2O3(001) surface, and the intermediates combine with gaseous Hg0, forming mercury–sulfur, mercury–chlorine compounds, and so forth. In addition, the different concentrations of SO2 are also discussed, and the corresponding X-ray photoelectron spectroscopy analysis on contrasted samples is conducted to research the morphological characterization, providing a reliable basis for judging the probable pathways of Hg0 transformation.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Yanli Zhang,Jian Li,Jianyu Cai,Shuangye Li,Xing Fan,Liyun Song,Ruixue Guo,Jiasheng Liu
In this study, a series of γ-Fe 2 O 3 -modified V 2 O 5 -MoO 3 /TiO 2 (VMT) catalysts was prepared by wet impregnation method. The γ-Fe 2 O 3 -modified catalysts exhibited excellent catalytic performance, and 1.25 wt% γ-Fe 2 O 3 content improved the deNO x efficiency at 150 °C from 54% (unmodified VMT catalyst) to 84% (modified catalyst). BET, XRD, XPS, NH 3 -TPD, H 2 -TPR, and in situ DRIFTs were employed to characterize the physicochemical properties and reaction mechanisms of the catalysts. The introduction of γ-Fe 2 O 3 increased the V 5+ /V 4+ ratio, surface chemisorbed oxygen content, redox ability, and a number of acid sites in the prepared catalysts. XPS confirmed the addition of γ-Fe 2 O 3 introduced new charge transfer pathways (Fe 3+ /Fe 2+ ↔ V 5+ /V 4+ ). In situ DRIFTs suggested that the addition of γ-Fe 2 O 3 to the catalyst significantly increased the adsorption capacity of catalyst for NH 3 and NO x , while also exerting a strong activating effect on the adsorbed NH 3 . Furthermore, selective catalytic reduction over the VMT and 5PEG@1.25Fe-VMT catalysts followed the Eley-Rideal (E-R) mechanism. At temperatures above 200 °C, the 5PEG@1.25Fe-VMT catalyst also followed the Langmuir-Hinshelwood (L-H) mechanism.
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FOOD CHEMISTRY
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2024
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IF 8.5
Keheng Zhu,Zhenhua Zhu,Shanshan Xu,Cheng Zhao,Tianjun Ni
Trimethylamine (TMA) is an organic amine with strong pungent smell which is an indicator gas for evaluating fish freshness according to the international standard. In this work, as-synthesize α-Fe 2 O 3 solid nanocubes (NCs), α-Fe 2 O 3 nucleoshell NCs and α-Fe 2 O 3 hollow NCs were used as sensing material to develop an outstanding TMA gas sensor. The response of the α-Fe 2 O 3 hollow NCs sensors towards 20 ppm TMA at 230 ℃ was 6.3. Meanwhile, these sensors showed exceptional response/recovery time, low limit of detection, great selectivity, and outstanding linear relationship. Furthermore, the analysis of gases released during the decomposition of Carassius auratus (0–10 days) was conducted, which demonstrated the assessment of TMA by α-Fe 2 O 3 hollow NCs sensor can evaluate the freshness of Carassius auratus . Such a novel sensor signifies the outstanding application potential in efficient gas-sensing properties of TMA, which will make the tremendous contribution for Carassius auratus product evaluation in the future.
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RSC Advances
·
2017
·Vol. 7
·期 24
·14382-14388
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IF 3.108
Xueyan Xu,Chengxiang Shi,Qi Li,Rui Chen,Tiehong Chen
We report a facile two-step pyrolysis and acid leaching process to fabricate a high performance oxygen reduction reaction (ORR) electrocatalyst Fe2O3@Fe–N–C, which is composed of Fe–N-doped carbon foam nanosheets with embedded carbon coated Fe2O3 nanoparticles to enhance the ORR performance in acidic medium. The ORR activities of the Fe2O3@Fe–N–C electrocatalysts obtained at different pyrolysis temperatures are investigated and the catalyst fabricated by pyrolysis at 800 °C displays the optimal activity. A rotating disk electrode (RDE) study reveals that it exhibits a positive half-wave potential of 0.535 V (vs. Ag/AgCl), high selectivity (4e− process), excellent long-term stability (96.3% of the initial current remaining after 20 000 s of continuous operation) and good tolerance against the methanol-crossover effect in acidic medium, making it a promising candidate for substituting the commercial Pt/C catalyst in polymer electrolyte membrane fuel cells (PEMFCs). The remarkable ORR activity originates from the cooperative effect of carbon coated Fe2O3 nanocrystals and Fe–N-doped carbon foam nanosheets. Moreover, the porous structure, high specific surface area, and electron conductivity could contribute to the enhanced ORR performance.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Xiaoyu Wang,Dejun Wang,Yanhong Lin,Tengfeng Xie
To enhance the oxygen evolution reaction (OER) performance of the zinc-air battery (ZAB), reduce charging voltage, and improve energy utilization efficiency, a sunlight-assisted strategy has been implemented. The photo-assisted rechargeable ZAB was proposed, featuring Ti–Fe 2 O 3 decorated with Co 0 · 8 Cu 0.2 -ZIF as the air electrode. Upon illumination, valence band holes were generated in Ti–Fe 2 O 3 , oxidizing Co 2+ in Co 0 · .8 Cu 0.2 -ZIF to Co 3+ /Co 4+ , enhancing OER performance, reducing the charging voltage from 2 V to 1.3 V and effectively narrowing the charging-discharging voltage gap from approximately 1.15 V–0.45 V. The Ti–Fe 2 O 3 /Co 0 · 8 Cu 0.2 -ZIF structure maintains a round-trip efficiency of 65.3% after 300 cycles. This result demonstrates the successful integration of photoelectrochemical principles with ZAB technology, showcasing its efficacy in solar energy storage and light energy conversion.
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APPLIED SURFACE SCIENCE
·
2024
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IF 6.3
Ziyu Jia,Yuming Yang,Chunwei Yang,Dong Wang
Aniline is highly toxic and difficult to degrade by conventional biological treatment processes. Thus, more efficient processing technology needs to be developed. Photocatalysis coupling catalytic ozonation (PCO) could be a solution. In this study, a green precipitation method was used to synthesize a γ-Fe 2 O 3 /ZnO@CNT catalyst, which exhibits high activity for aniline PCO degradation and strong magnetic properties for rapid separation. Under the optimal conditions, the aniline removal rate reached 93.5%. After 5 reaction cycles, the γ-Fe 2 O 3 /ZnO@CNT catalysts can be separated easily with a magnet, and a 91% aniline removal rate can be maintained. Furthermore, there are at least 4 kinds of advanced oxidation processes (AOPs) in this system, i.e., (1) photocatalytic oxidation; (2) catalytic ozonation; (3) photocatalytic ozone; and (4) Fenton oxidation. Thus, a novel stable and magnetically separable catalyst was developed, and new insight were provided for the role of PCO processes in the treatment of aniline.
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Frontiers of Environmental Science & Engineering
·
2018
·Vol. 12
·期 1
·1-8
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IF 1.961
Gao Pan,Song Yuan,Wang Shaoning,Descorme Claude,Yang Shaoxia
The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst, a novel environmental-friendly material, was used to investigate the catalytic wet air oxidation (CWAO) of cationic red GTL under mild operating conditions in a batch reactor. The catalyst was prepared by wet impregnation, and characterized by special surface area (BET measurement), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Fe 2 O 3 -CeO 2 -Bi 2 O 3 /γ-Al 2 O 3 catalyst exhibited good catalytic activity and stability in the CWAO under atmosphere pressure. The effect of the reaction conditions (catalyst loading, degradation temperature, solution concentration and initial solution pH value) was studied. The result showed that the decolorization efficiency of cationic red GTL was improved with increasing the initial solution pH value and the degradation temperature. The apparent activation energy for the reaction was 79 kJ·mol –1 . Hydroperoxy radicals (HO 2 ·) and superoxide radicals (O 2 – ·) appeared as the main reactive species upon the CWAO of cationic red GTL.
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JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
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2018
·Vol. 93
·期 9
·2552-2563
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IF 2.587
Yi Yang,Huiping Zhang,Ying Yan
BACKGROUND A novel iron-loaded microfibrous entrapped carbon-nanotube catalyst (Fe 2 O 3 -MF-CNT) was synthesized by wet lay-up papermaking, sintering and metal organic chemical vapor deposition (MOCVD) processes. The catalysts were characterized by N 2 adsorption–desorption isotherm, mercury porosimetry, scanning electron microscopy (FE-SEM), energy dispersive spectroscopy (EDS) and NH 3 temperature program desorption (NH 3 -TPD), and the catalytic performance was tested by catalytic wet peroxide oxidation (CWPO) of m-cresol in a fixed-bed reactor. Finally, the probable multistep reaction pathway for CWPO degradation of m-cresol over Fe 2 O 3 -MF-CNT catalyst in a fixed-bed reactor is presented. RESULTS Characterization results conclude that the prepared catalysts are acid catalysts containing macropores and mesopores. Active components Fe 2 O 3 are evenly loaded on the support by the MOCVD method. CWPO results show that higher temperature and higher space time promote the catalyst performance. Meanwhile, the Fe 2 O 3 -MF-CNT catalyst shows perfect reusability with nearly no iron leaching concentration and high m-cresol conversion (above 95.0%) after four successive runs (24 h). Two possible pathways during degradation of m-cresol are presented. The hydroxyl radicals turn m-cresols into aromatic by-products such as p-toluquinone, 4-methylpyrocatechol and methylhydroquinone, followed by evolution to organic acids, and finally to carbon dioxide and water. During the reaction, more m-cresols are degraded through the pathway in which m-cresols are first converted into 4-methylpyrocatechol. CONCLUSION The novel Fe 2 O 3 -MF-CNT catalyst presented herein owns the advantages of both CNTs and stainless steel fibers, and it shows promising performance in CWPO of m-cresol. © 2018 Society of Chemical Industry
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Aquaculture Reports
·
2025
·
IF 3.7
Xiao-Lei Wei,Zhi-Wei Hao,Yannis P. Kotzamanis,Tian-Hua Zhang,Zhi-Bo Liu,Hong Yang,Zhi Luo
The present study investigated the growth performance, body composition, mineral content and intestinal health of yellow catfish juveniles fed different iron diets and explored the dietary Fe requirements for this fish species. Using iron oxide nanoparticles (Fe 2 O 3 NPs) as the Fe sources, we formulated six experimental diets with dietary Fe levels at 22.23, 28.28, 36.10, 44.53, 52.21, and 61.85 mg Fe/kg diet, respectively. Yellow catfish fed with 44.53 mg Fe/kg diet had the highest growth performance and feed utilization, while those fed 61.85 mg Fe/kg diet showed the lowest growth performance and feed utilization. Dietary Fe addition increased whole-body and intestinal Fe contents. Additionally, the addition of dietary Fe had an impact on whole-body crude protein, crude lipid, ash, calcium (Ca), magnesium (Mg), zinc (Zn), and manganese (Mn) contents, but did not whole-body moisture and copper (Cu) contents. Yellow catfish fed with 44.53 mg Fe/kg diet had an improvement in intestinal histology and an increase in expression of intestinal tight junction-related genes [ occludin and tight junction protein 1b ( zo-1b )] as well as antioxidant response genes [ superoxide dismutase 1 ( sod1 ), sod2 and catalase ( cat )], and had higher activities of antioxidant enzymes [CAT, total SOD (T-SOD) and total antioxidant capacity (T-AOC)]. However, malondialdehyde (MDA) content, and gene expression of glucose-regulated protein 78 ( grp78 ), eukaryotic translation initiation factor 2α ( eif2α ), activating transcription factor 4 ( atf4 ), inositol-requiring enzyme 1 ( ire1 ) (related to endoplasmic reticulum stress), and mRNA levels of tumor necrosis factor α ( tnfα ), interleukin 1β ( il1β ), il8 (related to inflammatory response) in the intestine were the lowest in 44.53 mg Fe/kg diet group. Conducting broken-line analysis of weight gain (WG) against dietary Fe levels, we revealed that the optimal Fe requirement was 45.28 mg Fe/kg diet, with Fe 2 O 3 NPs as Fe source.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Fangxian Wang,Junwei Yang,Shihao Li,Junwen Liang,Yuwei Wang,Rong Du,Bo Zhou,Qiong Liu,Changping Li
Bromate is a commonly identified carcinogenic and genotoxic disinfection byproduct in water. Electrochemical debromination is an environmentally friendly and effective approach but it often suffers the limited reducing atomic H (H*) ability and high metal catalyst dosage. In this study, a unique composite catalyst comprised of ultra-low loading Cu single atoms (0.016 wt%) and Fe 2 O 3 nanoparticles supported on a Nb 2 C MXene (denoted as Cu 0.2 /Fe 0.1 /Nb 2 C) was synthesized by one-step high-temperature molten salt method. The Cu 0.2 /Fe 0.1 /Nb 2 C significantly outperformed the Nb 2 C, Cu 0.2 /Nb 2 C and Fe 0.1 /Nb 2 C counterparts in the electrochemical debromination with a 94.2 % removal efficiency of bromate. It is revealed that the introducing of Cu single atoms, efficiently promotes the adsorption of H* and inhibition of competitive H 2 evolution. The incorporation of Fe 2 O 3 nanoparticles significantly increased the electronic metal-support interaction effect between the metal components and Nb 2 C, thereby forming a noticeable electronic cloud bridge to facilitate efficient charge transfer. Ultimately, the synergistic interplay between Cu single atoms and Fe 2 O 3 nanoparticles plays a crucial role in achieving the remarkable removal performance of bromate. This work not only presents a significant instance of a synergistic catalyst involving metal single atoms and metal nanoparticles for effective electrochemical debromination but also advances the understanding of the electronic metal-support interaction.
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Frontiers in Bioengineering and Biotechnology
·
2024
·
IF 4.3
Feng Kai,Di Ya,Han Meng,Yan Weitao,Guo Yulin,Huai Xiangqian,Wang Yimin
A novel photoelectrochemical (PEC) aptasensor based on a dual Z-scheme α-Fe2O3/MoS2/Bi2S3 ternary heterojunction for the ultrasensitive detection of circulating tumor cells (CTCs) was developed. The α-Fe2O3/MoS2/Bi2S3 nanocomposite was prepared via a step-by-step route, and the photoproduced electron/hole transfer path was speculated by conducting trapping experiments of reactive species. α-Fe2O3/MoS2/Bi2S3-modified electrodes exhibited greatly enhanced photocurrent under visible light due to the double Z-scheme charge transfer process, which met the requirement of the PEC sensor for detecting larger targets. After the aptamer was conjugated on the photoelectrode through chitosan (CS) and glutaraldehyde (GA), when MCF-7 cells were presented and captured, the photocurrent of the PEC biosensing system decreased due to steric hindrance. The current intensity had a linear relationship with the logarithm of MCF-7 cell concentration ranging from 10 to 1×105 cells mL−1, with a low detection limit of 3 cell mL−1 (S/N = 3). The dual Z-scheme α-Fe2O3/MoS2/Bi2S3 ternary heterojunction-modified PEC aptasensor exhibited high sensitivity and excellent specificity and stability. Additionally, MCF-7 cells in human serum were determined by this PEC aptasensor, exhibiting great potential as a promising tool for clinical detection.
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Materials
·
2024
·Vol. 17
·期 18
·4546
·
IF 3.1
Li Liu,Zhenghao Cui,Bo Feng,Mengjing Sui,Huaqin Huang,Zhaoyang Wu
In this study, novel Fe2O3/TiO2photocatalytic composites were synthesised by combining traditional oxidation roasting with the sol-gel method, using low-cost metallurgical waste (iron scales) as the raw material. The characterisation results revealed that the oxidised iron scales could be transformed into high-purity and porous Fe2O3particles through oxidation roasting, thereby providing additional sites for the adsorption process and thus serving as an effective carrier for TiO2-based photocatalytic materials. During the sol-gel process, TiO2was loaded onto the synthesised Fe2O3particles, generating core-shell heterostructure Fe2O3/TiO2photocatalytic composites. Under visible light irradiation for 90 min, the Fe2O3/TiO2photocatalytic composites achieved a remarkable methylene blue removal rate (97.71%). This reaction process followed the quasi-first-order kinetic model with a rate constant of 0.038 min−1. The results have demonstrated that this combination of various components in the Fe2O3/TiO2photocatalytic composites improved the adsorption, light utilisation, and charge separation effect of the photocatalysts. Moreover, the material exhibited favourable stability and recyclability, making it a decent candidate for the treatment of wastewater from the biochemical industry. Therefore, this study provides a new strategy for improving the photocatalytic activity of TiO2and expanding the high value-added utilisation of iron scales.
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