International Journal of Applied Ceramic Technology
·
2023
·Vol. 21
·期 1
·493-503
·
IF 2.1
Wangzhe Leng,Guoxi Wan,Yanyu Liu,Rui Ma,Yi Du
The new (0.96- x )(K 0.48 Na 0.52 Nb 0.96 Sb 0.04 )O 3 -0.04(Bi 0.5 Ag 0.5 )ZrO 3 - x (Fe 2 O 3 -In 2 O 3 ) ceramics with high dielectric, and electromechanical coupling properties were designed. In this work, the effect of KNN-based ceramics lattice distortion (c/a) and microstructure on the electrical properties was explored by varying the doping amount of Fe 3+ and In 3+ . The problem of a large number of oxygen vacancies generated by the volatilization of K and Na can be well solved by introducing Fe 3+ and In 3+ . The bulk density increases significantly and the maximum value is about 4.52 g/cm 3 .The sample with x = 0.003 has the smallest c/a, and exhibits the best piezoelectric and dielectric properties ( d 33 = 536 pC/N, ε r = 3432 and k p = 55.8 %). Low doping concentration of Fe 2 O 3 is considered a “soft” addition for KNN-based piezoelectric ceramics. The study of this mechanism provides a new idea to regulate the electrical performance of KNN-based ceramics.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 6
·062501
·
IF 4.386
Chanez Maouche,Yazhou Zhou,Bing Li,Chao Cheng,Zirui Wu,Xue Han,Shaosheng Rao,Yi Li,Nasir Rahman,Juan Yang
Iron-nitrogen-carbon graphitic (Fe-N-C), a noble metal-free catalyst holds a lot of promise to substitute platinum (Pt) as an efficient catalyst in the oxygen reduction reaction (ORR). However, the synthesis process and the stabilization of single atoms that tend to aggregate, without jeopardizing the catalytic activity remain challenging. Here we demonstrate a stabilized assisted method for the preparation of Fe-N-C electrocatalyst by using graphitic carbon nitride (g-C3N4) nanosheet as a template. Fe ions are absorbed on the surface of g-C3N4 and imprisoned after the addition of pyrrole, preventing Fe migration that may result in nanoparticles. During the pyrolysis, Fe atoms coordinated with N provided by g-C3N4 and pyrrole on graphitic carbon to form Fe-N-C with a metal loading of 5.4 wt%. Moreover, FeNx species were introduced in the graphitic carbon, where the coexistence of micro and mesopores were favorable to offer a larger density of active sites compared to Fe/NP without pyrrole. Fe-N-C demonstrated a good electrocatalytic performance with a half-wave potential (E1/2) of 0.82 V (vs reversible hydrogen electrode (RHE)) higher than Fe/NP (0.76 V) and close to Pt/C, with a superior long stability of 85% in alkaline media after 40000 s.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Zongtang Liu,Congcong Ding,Pingting Gao,Yunxia Xu,Yufeng Sun,Xiaoju Wen,Jingtao Dai,Zhenghao Fei
For the first time, the dechlorination of 2,6-dichlorophenol (2,6-DCP) by carbon nanotubes supported Fe/Ni nanoparticles (CNTs-Fe/Ni) was studied to explore the practicability of environmental remediation. Removal capacity of CNTs-Fe/Ni for 2,6-DCP was enhanced obviously compared to Fe/Ni due to reduced aggregation of Fe/Ni nanoparticles .The removal efficiency increased as the increase of CNTs-Fe/Ni dosage and Ni loading, whereas it decreased as the increase of 2,6-DCP concentration. Weak acidic condition was considered to be advantageous to 2,6-DCP dechlorination. The dechlorination kinetics results suggested that the 2,6-DCP removal by CNTs-Fe/Ni accorded with pseudo-first-order equation. Moreover, carbon nanotubes as support accelerated the mass transfer of 2,6-DCP from solution to catalyst surface and promoted the formation of atomic hydrogen, which also led to an enhancement of reactivity of CNTs-Fe/Ni on removing 2,6-DCP.
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FUEL
·
2023
·
IF 7.4
Xinyi Chen,Guangsheng Zou,Yanliang Yuan,Zuwei Xu,Haibo Zhao
The current study investigates a nano-Fe/Ce oxygen carriers (OCs) doped with Ni synthesized by flame spray pyrolysis (FSP) method for the chemical looping dry reforming of methane (CL-DRM). The thermodynamic analysis and reaction simulation of the CL-DRM process with iron-based oxygen carriers are first carried out. The result shows that when reacting with CH 4 , Fe 2 O 3 is reduced to Fe 3 O 4 at first, accompanied by generation of H 2 O and CO 2 , and then to Fe with H 2 and CO production. Fe can be oxidized to Fe 3 O 4 and FeO by CO 2 . Subsequently, based on the reaction patterns obtained from the aforementioned analysis, CL-DRM experiment using Ni-doped Fe/Ce oxygen carriers is conducted in a fixed-bed reactor, and the effects of different Ni doping and reaction conditions on the performance of the oxygen carriers are investigated. The OC with a Ni/Fe molar ratio of 2/98 (2NiFe) achieves over 30% CH 4 conversion and 90% CO selectivity in the partial oxidation step and stable cyclic performance. The FSP process facilitates high dispersion of Ni and formation of NiCe and NiFe alloys, which are stable active sites. Moreover, the transformation of Fe oxides and CeO 2 into CeFeO 3 on the surface of the OC has enhanced lattice oxygen availability and further improved cyclic stability.
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JOURNAL OF HAZARDOUS MATERIALS
·
2020
·
IF 9.038
Weirui Chen,Yixiang Bao,Xukai Li,Jun Huang,Jinxin Xie,Laisheng Li
Heterogeneous catalytic ozonation had met the bottlenecks when treating low concentration but high toxic pollutants: (i) the low mass transfer efficiency of ozone and pollutants to hydrophilic catalyst; (ii) the negative impact of coexisted water matrixes. Herein, to enhance the mass transfer efficiency of reactants toward hydrophilic Fe-MCM-41 as well as enhance the interfacial reaction, the fluoride planting Fe-MCM-41 (F-Fe-MCM-41) was synthesized and employed as catalyst in catalytic ozonation for nitrobenzene (NB). Both NB and TOC removal were promoted in F-Fe-MCM-41/O 3 with 99.0 % NB removal in 60 min and 88.6 % TOC removal in 120 min, which were superior to the degradation efficiency by O 3 and Fe-MCM-41/O 3 . FTIR, EPR, Mössbauer spectra, 29 Si NMR, 19 F NMR et al verified that the replacement of non-reactive silanols (-Si−OH) of Fe-MCM-41 with Si F groups could enhance its hydrophobicity, Lewis acidity and mass transfer effect. Comparative characterizations, experiments and theoretical calculations verified that interfacial reaction played the major role over liquid phase reaction for NB degradation in F-Fe-MCM-41/O 3 . Moreover, the strengthened interfacial reaction also reduced the OH scavenging effect of water matrix, such as humic acid and carbonate. The interfacial adjustment method proposed in this study provided a novel insight into catalyst design and water treatment process.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2019
·
IF 3.375
Tianwen Ma,Xiaojie Tan,Qingshan Zhao,Zhuangzhuang Wu,Fengliang Cao,Jingyan Liu,Xiaocui Wu,Hui Liu,Xiaobo Wang,Hui Ning,Mingbo Wu
In this study, we demonstrate noble metal-free Fe–N-codoped graphene nanoshells (Fe–N/GNS) derived from petroleum pitch as highly efficient and cost-effective catalysts for nitroaromatics reduction. By employing α-Fe2O3 nanoparticles simultaneously as both the hard template and the metal source, Fe–N/GNS can be facilely synthesized through the template-oriented method, followed by thermal annealing with urea for nitrogen doping. Owing to the high-dispersed synergetic Fe–N active sites as well as the hierarchical porous nanoshell structure, the Fe–N/GNS catalysts show remarkable catalytic performance and good tolerance for the reduction of nitroaromatics with NaBH4 aqueous solution. The optimized Fe–N/GNS-800 corresponds to pseudo-first-order kinetics for p-nitrophenol reduction at room temperature, with the rate constant (k) reaching 1.23 min–1. The reinforced structure also allows the catalyst to be readily recycled a dozen times without activity deterioration. This work may provide a new avenue to facilely fabricate cost-effective but powerful catalysts for nitroaromatics reduction and beyond.
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高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Manigandan Ramadoss,Yuanfu Chen,Yang Hu,Bin Wang,Ramkumar Jeyagopal,Karpuraranjith Marimuthu,Xinqiang Wang,Dongxu Yang
The sluggish kinetics and high cost of the noble-metal based electrocatalyst for oxygen evolution reaction (OER) still seriously limits the efficiencies of water splitting. Herein, for the first time, we rationally design a porous hierarchical nanoarchitecture, constructed by ultrathin CoSe 2 embedded Fe-CoO nanosheets (CoSe 2 @Fe-CoO), which is synthesized via self-assembly hydrolysis driven in-situ synergetic selenization of Fe/Co/O/Se precursor followed by Ostwald ripening. As an OER catalyst, the porous CoSe 2 @Fe-CoO hybrid with abundant CoOOH electroactive sites delivers a small Tafel of 56.2 mV/dec with very low onset overpotential of 280 mV@10 mA/cm 2 and excellent long-term physicochemical stability till 62 h without obvious decay, which outperforms well-established benchmark electrocatalysts (RuO 2 ). The boosted OER performance of CoSe 2 @Fe-CoO nanosheets is mainly attributed to its iron-doping effect, porous nanoarchitecture, and multicomponent synergetic/interfacial effect between ultrathin cobalt (II) oxide and conductive cobalt selenide (CoSe 2 ) nanoframework. This work presents a facile construction strategy to find a nonprecious hybrid OER electrocatalyst with excellent performance and long-term stability.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Xukai Li,Weirui Chen,Yiming Tang,Laisheng Li
Fe-MCM-48 catalyst with a three-dimensional cubic pore structure was directly synthesized via a hydrothermal method, and the mineralization efficiency of diclofenac (DCF) in the catalytic ozonation process (Fe-MCM-48/O 3 ) was assessed. X-ray diffraction (XRD), N 2 adsorption desorption, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS) characterizations revealed that Fe existed in the framework of MCM-48, and Fe-MCM-48 possessed a large surface area and a highly ordered cubic mesoporous structure, which could accelerate reactants and products diffusion. Regarding mineralization efficiency, the addition of Fe-MCM-48 significantly improved total organic carbon (TOC) removal, and approximately 49.9% TOC were removed through the Fe-MCM-48/O 3 process at 60 min, which was 2.0 times higher than that in single ozonation. Due to this catalyst's superior structure, Fe-MCM-48 showed the better catalytic activity compared with Fe-MCM-41 and Fe loaded MCM-48 (Fe/MCM-48, Fe existed on the surface of MCM-48). DCF removal in the Fe-MCM-48/O 3 process was primarily based on ozone direct oxidation. The improvement of mineralization efficiency was attributed to the function of generated hydroxyl radicals (•OH), which indicated that the presence of Fe-MCM-48 accelerated ozone decomposition . Moreover, the negatively charged surface of Fe-MCM-48 and the proper pH value of the DCF solution played an essential role in OH generation.
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高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Lile Dong,Peng Zhang,Pengpeng Lei,Shuyan Song,Xia Xu,Kaimin Du,Jing Feng,Hongjie Zhang
Contrast agents for multimodal imaging are in high demand for cancer diagnosis. To date, integration of T1/T2-weighted magnetic resonance imaging (MRI) and X-ray computed tomography (CT) imaging capabilities in one system to obtain an accurate diagnosis still remains challenging. In this work, biocompatible PEGylated GdF3:Fe nanoparticles (PEG-GdF3:Fe NPs) were reasonable designed and synthesized as multifunctional contrast agents for efficient T1/T2-weighted MRI and X-ray CT multimodal imaging. Owing to the enhanced permeability and retention effect in vivo, strong T1 contrast, evident T2 contrast, and X-ray CT signals in a tumor lesion can be observed after intravenous injection of PEG-GdF3:Fe NPs. Therefore, PEG-GdF3:Fe NPs could be used as potential multimodal contrast agents for cancer diagnosis.
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高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Zhaoyang Su,Xing Li,Yanling Yang
To provide an insight into aluminum (Al) control during the treatment of micro-polluted water, recycling ferric water treatment sludge (Fe-WTS) as an alternative approach was innovatively investigated. Particular attention was paid to the recycling ratio of Fe-WTS when coagulated at an optimized dosage of both Al 2 (SO 4 ) 3 and polyaluminum chloride (OH/Al = 2.0, denoted as PAC 20 ) respectively. Coagulation performance, i.e., turbidity, organics and Al speciation were also examined. A morphological analysis, characterized via floc size and fractal dimension, was further conducted to explore the fundamental floc operational parameters and to elucidate the mechanism of different Al species removal. The results indicate that an appropriate recycling ratio yields improvements in residual Al control. In comparison, Fe-WTS is more effective in dissolved Al (Al D ) removal when coagulated by Al 2 (SO 4 ) 3 , while is proper to the reduction of colloidal Al (Al CO ) when coagulated by PAC 20 . Flocs properties are significantly correlated with Al speciation during the treatment. Specifically, floc size is proportional to Al CO removal rate, however, the value of floc fractal dimension is inversely proportional to Al D removal rate.
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高影响因子
Desalination and Water Treatment
·
2025
·
IF 1
Qian Wang,Haifeng Yang,Shanni Lin,Wei Ji,Shu Zhang,Wenjie Wang,Jiazheng Yu,Jingwen Gao,Xiulei Fan
The advanced oxidation processes (AOPs) employing bimetallic catalysts for peroxodisulfate (PDS) activation has attracted considerable attention. A novel composite, polyethylene mulch-sorghum straw biochar (Fe-Mo 0.1 /N-PSC), was synthesized via hydrothermal activation, co-impregnation, and high-temperature pyrolysis to enhance catalytic efficiency and facilitate agricultural solid waste valorization. In the Fe-Mo 0.1 /N-PSC/PDS system, this composite efficiently activated PDS, achieving 91.86 % tetracycline (TC) removal within 3 minutes, with a pseudo-first-order rate constant of 0.1426 min⁻¹ , surpassing comparable catalytic systems. The influences of PDS concentration, catalyst dosage, pH, and temperature on TC degradation were systematically investigated. X-ray photoelectron spectroscopy indicated that the reactive Mo 4 + promoted the cycle of Fe²⁺/Fe³ ⁺, accelerating reaction kinetics. Quenching and electron paramagnetic resonance analyses confirmed the generation of radicals (•OH, SO₄•⁻, O₂•⁻), which actively contributed to TC degradation. Additionally, the persistent free radicals derived from PE during hydrothermal activation further enhanced degradation efficiency. Liquid chromatography-mass spectrometry identified degradation intermediates, elucidating possible pathways and proving the toxicity of intermediates greatly reduced. The system exhibited excellent stability, maintaining over 75 % degradation efficiency after five cycles with minimal metal leaching, offering valuable insights for practical applications. This study highlights Fe-Mo 0.1 /N-PSC as an effective PDS catalyst and a sustainable strategy for agricultural waste reutilization.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yanyan Wang,Guobao Li,Youxin Hao,Yuhan Xie,Xintian Li,Changlong Chen,Anning Jiang
In recent years, the rapid economic development has significantly altered industrial production and human lifestyle, resulting in the exacerbation of water pollution. Consequently, photocatalytic technology has received considerable attention as an environmentally friendly and efficient approach for wastewater treatment. In this paper, WO 3 /SiO 2 /SnO 2 composite films were prepared by sol-gel method and subsequently co-doped with Ce, Fe and Ag ions. The photocatalytic performances of these modified composite films toward degradation of methyl green (MG) and tetracycline (TC) were systematically evaluated under UV and visible light irradiation. Comprehensive characterization techniques, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), Nitrogen adsorption desorption isotherm test, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), and photoluminescence (PL) spectrascopy, were employed to investigate the crystalline phase, morphology, particle size, chemical composition, specific surface area and optical properties of the prepared composite films. The PL spectral analysis revealed that the co-doping of Ce, Fe and Ag significantly enhanced the separation efficiency of photogenerated charge carrier in the WO 3 /SiO 2 /SnO 2 composite films. Radical trapping experiments demonstrated that superoxide radicals (·O 2 - ) and hydoxyl radicals (·OH) played predominant roles in the photocatalytic degradation process. Notably, the prepared photocatalyst maintained stable performance through five consecutive recycling tests, demonstrating excellent reusability. The enhanced photocatalytic activity of the WO 3 /SiO 2 /SnO 2 -Ce/Fe/Ag composite films can be attributed to the impactful suppression of electron-hole recombination through the strategic incorporation of dopant ions.
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