ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Huayu Chen,Shuxin Ouyang,Ming Zhao,Yunxiang Li,Jinhua Ye
Water splitting has been greatly limited by the sluggish kinetics of the oxygen evolution reaction (OER). High-oxidation-state metal species are required as the favorable active sites in OER. Here, amorphous Cox–Fe–B (x is the molar ratio of Co/Fe), Co–B, and Fe–B compounds were successfully synthesized as the oxygen evolution electrocatalysts. The calculation of turnover frequency (TOF) indicates that both the Co and Fe sites are active for OER. Cyclic voltammetry, X-ray photoelectron spectroscopy, and long-term stability curves were used to demonstrate that Fe can stabilize Co in a higher oxidation level and meanwhile promote the generation of OOH-like species (the key intermediates for OER). The reduced impedance for Co2–Fe–B (compared with that for Fe–B and Co–B) obtained from the electrochemical impedance spectra confirms the enhanced conductivity for the Co2–Fe–B. This optimal sample on Cu substrate shows a low overpotential of 0.298 V at the current density of 10 mA cm–2 with a decreased overpotential of 42 mV compared to that of Co–B. The Co2–Fe–B catalyst also exhibits a small Tafel slope of 62.6 mV/dec and good stability. The enhanced performance could be attributed to the synergistic effect of the increased population of high-oxidation-state metal–OOH species and the promoted conductivity of the catalyst. A solar-to-hydrogen energy conversion efficiency of 4.2% and a Faradaic efficiency of 97.2% can be achieved by connecting the HER and as-prepared OER electrodes to a crystalline silicon solar cell.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shishun Wang,Shuang Gai,Kui Cheng,Zhuqing Liu,Markus Antonietti,Fan Yang
The degradation efficiency of organic contaminants using Fenton-like system based on Fe(II) and peroxymonosulfate (PMS) has been hindered by the rapid transformation from Fe(II) to Fe(III) and the slow regeneration of Fe(II). To address this challenge, artificial humic acid (AHA) derived from biomass was incorporated into Fe(III)/PMS system to build AHA/Fe(III)/PMS system. The results demonstrated that the degradation rate of atrazine (ATZ) in AHA/Fe(III)/PMS system (98.83%) is significantly superior to those in Fe(III)/PMS (16.51%) and AHA/PMS system (41.76%) within 90 min. Furthermore, Fe(II) measurement experiments revealed that AHA exhibited more significant iron-reducing potential. The analysis of FTIR, 3D-EEM, and liquid NMR indicated that AHA possessed more structures with reductive potential in comparison to commercial humic acid (CHA) and humic acid extracted from lignite (LHA). The results of persistent free radicals indicated that CHA possessed oxidative potential, which also accounted for the lowest Fe(II) concentration in those system containing CHA. Furthermore, quenching experiments, EPR analysis, and PMSO probe analysis have indicated the presence of reactive species such as •OH, SO 4 •- , and Fe(IV) within AHA/Fe(III)/PMS system. The degradation products from ATZ were identified and determined to exhibit reduced toxicity relative to parent compound. Collectively, these findings presented an in-depth understanding to reactivate Fe(III)/PMS system, offering a promising alternative strategy for efficient degradation of organic pollutants in water treatment processes.
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WATER SCIENCE AND TECHNOLOGY
·
2024
·Vol. 89
·期 7
·1682-1700
·
IF 2.5
Zhang Longbin,Gao Jianxiong,Liu Yulong,Zhou Zhengyuan,Sheng Xianxian,Li Dexiao,Chen Yuantian,Lyu Shuguang
View large Download slide View large Download slide Close modal In this research, ascorbic acid (AA) was used to enhance Fe(II)/Fe(III)-activated permonosulfate (PMS) systems for the degradation of fluoranthene (FLT). AA enhanced the production of ROS in both PMS/Fe(II) and PMS/Fe(III) systems through chelation and reduction and thus improved the degradation performance of FLT. The optimal molar ratio in PMS/Fe(II)/AA/FLT and PMS/Fe(III)/AA/FLT processes were 2/2/4/1 and 5/10/5/1, respectively. In addition, the experimental results on the effect of FLT degradation under different groundwater matrixes indicated that PMS/Fe(III)/AA system was more adaptable to different water quality conditions than the PMS/Fe(II)/AA system. was the major reactive oxygen species (ROS) responsible for FLT removal through the probe and scavenging tests in both systems. Furthermore, the degradation intermediates of FLT were analyzed using gas chromatograph-mass spectrometry (GC-MS), and the probable degradation pathways of FLT degradation were proposed. In addition, the removal of FLT was also tested in actual groundwater and the results showed that by increasing the dose and pre-adjusting the solution pH, 88.8 and 100% of the FLT was removed for PMS/Fe(II)/AA and PMS/Fe(III)/AA systems. The above experimental results demonstrated that PMS/Fe(II)/AA and PMS/Fe(III)/AA processes have a great perspective in practice for the rehabilitation of FLT-polluted groundwater. The effect of AA on the circulation between Fe(II) and Fe(III) in the PMS system was investigated. SO 4 •− was the primary ROS in PMS/Fe(II)/AA and PMS/Fe(III)/AA systems. The effect of actual groundwater matrixes on FLT removal was investigated. The possible degradation pathways of FLT were proposed. Effective degradation of FLT in actual groundwater was achieved.
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MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Mingming Zou,Fengqiang Xiong,Ayyakannu Sundaram Ganeshraja,Xiaohua Feng,Chuanxi Wang,Tiju Thomas,Minghui Yang
Iron (III) and nitrogen co-doped mesoporous TiO 2 microspheres (Fe-N-TiO 2 ) are prepared using a self-assembly based solvothermal process followed by an ammonothermal method. Among all samples, 1 mol.% of Fe dopants and 500 °C nitridation (for 2 h) gives the highest visible light photoactivity. Results imply that the Fe 3+ /Fe 2+ dopant trap energy level introduced within the band gap in mildly Fe (∼1 at%) doped TiO 2 and the mesoporous nature of the material, both aid in the observed catalytic performance. Subjecting Fe-TiO 2 samples to ammonothermal process induces oxygen vancancies, and substitutional and interstitial N. This reduces optical band gap, and introduces local states. The lower band gap and local states together aid in the absorption of visible light and separation of charge carriers. Co-dopants are distributed uniformly in the best photocatalysts . The active species generated in the photocatalytic system is shown to be singlet molecular oxygen ( 1 O 2 ) using selective radical quenchers.
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ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Ning Liu,Ti-Bo Fang,Ling-Xi Zhao,Na Li,Xiang-Feng Chen,Ru-Song Zhao
Naphthalene acetic acid (NAA) is an auxin plant growth regulator (PGR) and widely used to regulate the growth process of plants. As excessive NAA enter the environment, it damages the ecological environment and endangers human life and health. Layered bimetallic hydroxides (LDHs) are widely used for the adsorption of pollutants due to their large surface area and excellent structural properties. Based on the classical Fe 3 O 4 @MgAl-LDH material, Fe 3 O 4 @FeMgAl-LDHs were synthesized by adding different contents of Fe element to adsorb NAA in water. The morphology and properties of Fe 3 O 4 @FeMgAl-LDHs and the effect of Fe on adsorption efficiency were studied. The adsorption process and adsorption mechanism of NAA were analyzed. The results indicated that the content of Fe element will affect the adsorption effect of NAA by influencing the specific surface area and adsorption sites of Fe 3 O 4 @FeMgAl-LDHs. The maximum adsorption capacity for NAA can reach 330.1 mg/g when the proportion of Fe is 0.50. Exploring the adsorption mechanism, Fe 3 O 4 @FeMgAl-LDHs achieved efficient removal of NAA through hydrogen bonding, van der Waals forces, anion exchange, and electrostatic interactions. The adsorption efficiency of various PGRs were deeply explored. Fe 3 O 4 @FeMgAl-LDH (Fe-0.50) has good adsorption and regeneration ability for various PGRs. Therefore, by exploring the influence of different Fe ratios on the adsorption efficiency of the Fe 3 O 4 @FeMgAl-LDH, the adsorption performance of the material can be improved, making it have greater application advantages in wastewater treatment containing drugs.
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IEEE SENSORS JOURNAL
·
2024
·Vol. 24
·期 23
·38685-38692
·
IF 4.3
Shan Tang,Jingcai Xu,Xinqin Lu,Weijie Chen,Hongwei Chen,Bo Hong,Xinqing Wang
Metal-organic frameworks (MOFs) have potential applications in gas sensing due to their abundant porosity and unique surface properties. In this study, Fe2O3 hexagonal spindles (Hgs) derived from MIL-88B(Fe) were successfully prepared using an oil bath method, followed by calcination treatment at an optimized temperature of
$450~^{\circ }$
C. The high-purity porous Fe2O3 Hgs showed excellent acetone gas-sensing performance in the range of 0.4–50-ppm acetone concentration. The Fe2O3 Hgs-450 obtained the high sensing response (Ra/Rg =23,
$\tau _{\text {res}} =17$
s, and
$\tau _{\text {rec}} =2059$
s), excellent selectivity, and stability over 120 days to 10-ppm acetone at an operating temperature of
$220~^{\circ }$
C. The sensing response value was still 1.88 even at 0.4-ppm acetone and the theoretical detection limit (DL) was calculated to reach 3.59-ppb acetone. These excellent acetone gas-sensing properties were attributed to the uniform porous structure, abundant adsorbed oxygen, and small grain size of Fe2O3 Hgs, making them an excellent candidate for screening diabetic patients through exhaled gas analysis.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jun Liu,Si-Yao Du,Meng-Jie Chang,Jia Li
Bismuth titanate (Bi 4 Ti 3 O 12 , BTO) has been demonstrated as a promising photocatalyst, but suffers from limited visible-light response, rapid recombination of photogenerated carrier, and few applications for the activation of peroxymonosulfate (PMS). In this work, Fe doped bismuth titanate (Fe/BTO) with very small thickness was successfully synthesized via a molten salt method by using Fe salt source. Compared with the conventional Fe/BTO prepared with Fe 2 O 3 source, the Fe/BTO prepared in this work has homogeneous nanosheet morphology with much smaller thickness around 13.8 nm and higher specific surface area. The doped Fe can significantly decrease the band gap, enhance the light absorption and charge separation. As a result, the Fe/BTO exhibits a significantly enhanced ability to activate PMS for the degradation of organic pollutants. By optimizing the Fe content and calcination temperature, the best Fe/BTO can degrade 99 % rhodamine B (RhB) within 15 min under visible light-PMS (L-PMS) condition with a kinetic constant of 0.4168, which is fairly superior to the BTO or the Fe/BTO under the individual light or PMS condition. Mechanistic studies confirm the involvement of 1 O 2 , e - , ·O 2 - , ·OH and SO 4 · - in the degradation process. This work provides a viable and efficient strategy for designing and preparing visible-light-driven Fe/BTO photocatalyst, advancing their potential for environmental remediation applications.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2024
·
IF 4.1
Yining Dong,Ping Song,Ce Han,Weilin Xu
In this paper, Pt-Fe alloy with low-content of Pt (2 %) was distributed uniformly over the porous Fe/NC substrate treated by nitric acid etching, with small amount of metallic Fe and Pt nanoparticles. The optimized Pt-Fe alloy on Fe/NC substrate showed higher ORR performance with the E 1/2 of around 0.83 V vs. RHE as well as faster catalytic kinetics. In addition, the catalytic activity has not been decayed through an accelerated durability test after 5000 cycles CVs, indicating better catalytic stability for the alloying catalyst. The introduction of Pt elements into Fe/NC substrate increased the numbers and species of ORR active sites, invoking higher ORR activity comparing with isolated Fe/NC catalyst. The acid etching provided more defects for the substrate to anchor the active sites stably. Moreover, the synergistic effect originated from the alloying of Pt and Fe modulated the electronic structure of Pt, increasing the ORR activity with low yield of H 2 O 2 . This decreasing H 2 O 2 yield can weaken the Fenton reaction to prevent the dissolution of Fe in the acid solution, which can improve the stability of the catalysts to meet the commercial needs for PEMFC.
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PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1651-1672
·
IF 3.6
Zhang Lei,Zou Zhuorui,Lei Zhang,Jia Yang
In this research, xylene was utilized as a simulated gas, γ-Al 2 O 3 pellets were selected as catalyst carriers, and FeO x , MnO x , CeO x , and CuO x were used as active components to analyze the synergistic treatment of VOCs–O 3 by low-temperature plasma combined with supported catalysts. Different metal oxides and other factors influence the synergistic treatment of VOCs–O 3 . The results showed that the catalytic effect of Fe–Mn/γ-Al 2 O 3 prepared by the equivalent volumes of consecutive impregnation method was better than that of Fe–Mn/γ-Al 2 O 3 prepared by co-impregnation method. When combined with low temperature plasma technology, high-energy electron collision reaction and oxidation reaction between free radicals occurs, which played a synergistic role in the degradation of VOCs–O 3 . The total removal rate of xylene was 94.88%, and the depletion rate of ozone was 84.1%.
研究领域:
環境科學
·
化學工程
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MICROCHEMICAL JOURNAL
·
2019
·
IF 3.206
Linli Hou,Yonghai Song,Yingjie Xiao,Rong Wu,Li Wang
Fluorescent metal-organic frameworks (MOFs) have attracted wide attention in fluorescence detection. Herein, a novel sensing platform for highly selective and sensitive detection of Fe 3+ in aqueous solution was proposed based on 2,5-dihydroxyterephthalic acid (DOBDC)-Zn 2+ MOFs (ZnMOF-74). The as-prepared ZnMOF-74 exhibited uniform clavicorn nanostructures and high day-to-day stability in acidic aqueous solution (pH 4.0). Because of the special response of phenolic hydroxyl groups of DOBDC with Fe 3+ , the cation exchange between Fe 3+ and Zn 2+ occurred, which caused collapse of the skeleton and formed a blue weak-fluorescent iron(III)-phenol salt complex (Fe-DOBDC), which led to the effective fluorescence quenching of ZnMOF-74. ZnMOF-74 was used as a probe for detection of Fe 3+ under relatively acidic condition with a good linear range of 0.1–100 μM and a low detection limit of 40 nM. The fluorescence probe was also applied to determine Fe 3+ in real river water and human serum with good recovery and accuracy. This work provided a good Fe 3+ sensor based on ZnMOF-74 due to high affinity between phenolic hydroxyl group and Fe 3+ .
研究领域:
材料科学
·
分析化学
·
环境科学
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RSC Advances
·
2017
·Vol. 7
·期 84
·53622-53630
·
IF 3.108
Changming Li,Hong Zeng,Pingle Liu,Jian Yu,Feng Guo,Guangwen Xu,Zhan-guo Zhang
The development of new routes for the utilization of red mud (RM) waste is very urgent due to its huge accumulation and potential environmental harm. By taking advantage of its Fe–Al–Si–Ti composition and excellent plasticity, we developed a ball milling and acid–base neutralization method to reuse the RM waste as Fe-based denitration catalysts. The resulting RM catalysts demonstrate excellent catalytic activity and stability with >90% NO conversion above 400 °C in the presence of SO2 and H2O, which is even much better than that of a commercial V–W–Ti catalyst. Characterization data reveal that our treatment eliminates poisonous alkaline metal elements and increases dispersion of RM particles, making the RM active for denitration reactions. The formation of ferric sulfate species with more reducible Fe3+/Fe2+ active sites by a SO2 activation method can further enhance the denitration activity. Moreover, NH3-TPD and in situ IR results demonstrate that the NH3-SCR reaction over the RM catalyst follows the Eley–Rideal mechanism at high temperature and the increased absorption of NH3 for alkaline metal-eliminated or SO2-activated samples accounts for its high DeNOx efficiency. The demonstrated feasibility for reusage of the RM as DeNOx catalyst has promising industrial prospects for its extremely low cost, no toxicity, and high efficiency.
研究领域:
环境科学
·
催化化学
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Advanced Science
·
2025
·
IF 14.1
Ting Ying,Qi Wang,Dejian Li,Yao Wang,Pengfang Zhang,Chengqing Yi,Rui Zhu
Osteoarthritis progression is driven by excessive reactive oxygen species (ROS), which causes significant secondary damage to chondrocytes and articular cartilage. Herein, the concept of holding desired dual-site nanozymes is proposed through developing Fe─Fe dimers on nitrogen-doped porous carbon (Fe 2 -NCs) to eliminate excessive ROS through the co-adsorption mechanism of superoxide radical. The Fe 2 -NCs present an enhanced ROS performance, effectively mimicking key antioxidant enzymes. Density functional theory calculations indicate that the synergistic effects of the Fe─Fe dimer can modulate oxygen adsorption configurations and accelerating O─O bond-cleavage. In vitro and in vivo results show that Fe 2 -NCs effectively mitigate ROS, protecting chondrocytes from oxidative stress-induced apoptosis. The mitochondrial function can be strengthened over Fe 2 -NCs by inhibiting NOX4 expression, restoring ATP levels, and normalizing COXIV expression. Additionally, Fe 2 -NCs significantly downregulate the pro-inflammatory mediator COX-2, inhibit MMP-13-mediated cartilage degradation, and slow down the type II collagen (COL2) breakdown through the inhibition of NF-κB signaling pathway.
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