Nanomaterials
·
2022
·Vol. 12
·期 16
·2839
·
IF 5.719
Yuruo Zheng,Ghulam Hussain,Shuyi Li,Shanta Batool,Xiawa Wang
In this work, nanoparticles of Co1−xRexFe2O4and CoFe2−xRexO4(0 ≤ x ≤ 0.05) were synthesized by the sol-gel method. The Rietveld refinement analysis of XRD and Raman data revealed that all of the prepared samples were single phase with a cubic spinel-type structure. With the substitution of Re, the lattice parameters were slightly increased, and Raman spectra peak positions corresponding to the movement of the tetrahedral sublattice shifted to a higher energy position. Furthermore, Raman spectra showed the splitting of T2gmode into branches, indicating the presence of different cations at crystallographic A- and B-sites. The SEM micrograph confirms that surface Re exchange changes the coordination environment of metals and induces Fe-site structure distortion, thereby revealing more active sites for reactions and indicating the bulk sample’s porous and agglomerated morphology. The vibrating sample magnetometer (VSM) results demonstrated that the synthesized nanoparticles of all samples were ferromagnetic across the entire temperature range of 300–4 K. The estimated magnetic parameters, such as the saturation magnetization, remanent magnetization, coercivity, blocking temperature (TB), and magnetic anisotropy, were found to reduce for the Co-site doping with the increasing doping ratio of Re, while in the Fe site, they enhanced with the increasing doping ratio. The ZFC-FC magnetization curve revealed the presence of spin-glass-like behavior due to the strong dipole–dipole interactions in these ferrite nanoparticles over the whole temperature range. Finally, the dielectric constant (εr′) and dielectric loss (tanδ) were sharply enhanced at low frequencies, while the AC conductivity increased at high frequencies. The sharp increases at high temperatures are explained by enhancing the barrier for charge mobility at grain boundaries, suggesting that samples were highly resistive. Interestingly, these parameters (εr′,tanδ) were found to be higher for the Fe-site doping with the increasing Re doping ratio compared with the Co site.
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PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 25
·期 22
·15547-15554
·
IF 3.3
Changyin Zhong,Yifei Yang,Yun Fang,Jun Chen,Bomin Feng,Hongbing Wang,Wenhua Luo,Yunxi Yao
Lanthanum oxide (La2O3) possesses superior reactivity during catalytic hydrogenation, but the intrinsic activity of La2O3 toward H2 adsorption and activation remains unclear. In the present work, we fundamentally investigated hydrogen interaction with Ni-modified La2O3. Hydrogen temperature programmed desorption (H2-TPD) on Ni/La2O3 shows enhanced hydrogen adsorption with a new hydrogen desorption peak at a higher temperature position compared to that on the metallic Ni surfaces. By systematically exploring the desorption experiments, the enhanced H2 adsorption on Ni/La2O3 is due to the oxygen vacancies formed at the metal–oxide interfaces. Hydrogen atoms transfer from Ni surfaces to the oxygen vacancies to form lanthanum oxyhydride species (H–La–O) at the metal–oxide interfaces. The adsorbed hydrogen at the metal–oxide interfaces of Ni/La2O3 results in improved catalytic reactivity in CO2 methanation. Furthermore, the enhanced hydrogen adsorption on the interfacial oxygen vacancies is ubiquitous for La2O3-supported Fe, Co, and Ni nanoparticles. Benefiting from the modification effect of the supported transition metal nanoparticles, the surface oxyhydride species can be formed on La2O3 surfaces, which resembles the recently reported oxyhydride observed on the reducible CeO2 surfaces with abundant surface oxygen vacancies. These findings strengthen our understanding of the surface chemistry of La2O3 and shed new light on the design of highly efficient La2O3-based catalysts with metal–oxide interfaces.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yuepeng Pang,Jing Wang,Zhiguo Zhou,Tao Yuan,Junhe Yang,Dalin Sun,Shiyou Zheng
Core-shell Fe 3 O 4 @Fe ultrafine nanoparticles (nano-Fe 3 O 4 @Fe, Fe 3 O 4 content 84 wt%) with a core (Fe) diameter of 5.1 ± 1.4 nm and a shell (Fe 3 O 4 ) diameter of 10.9 ± 1.6 nm is prepared by a liquid-phase pyrolysis and partial oxidation method. It is found that the core-shell Fe 3 O 4 @Fe ultrafine nanostructure can efficiently improve the electrochemical performance of Fe 3 O 4 as anode material for Li-ion batteries in terms of rate capability and cycle life. For instance, specific capacities of 884 and 705 mAh/g can be obtained for the nano-Fe 3 O 4 @Fe electrode after 100 cycles at 200 mA/g and 500 cycles at 1000 mA/g, respectively. It is believed that these improvements can be attributed to the significant shortened transfer distance of electrons and Li-ions with relatively low specific surface area, ultrahigh electronic conductivity inside the nanoparticles and good ductility to accommodate the asymmetric volume change.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Guojun Lv,Tao Wang,Xuyang Zou,Jialing Shen,Jiangzhang Wang,Yan Chen,Fumin Wang,Xubin Zhang
Framework doped iron materials such as Fe-MFI zeolite is an important heterogeneous Fenton-like catalyst for tetracycline degradation. Introduction of mesopore can enhance the tetracycline degradation performance for hollow Fe-MFI zeolite, however its positive effect is extremely limited ascribed to the essence of active sites of confined framework iron species. In this work, highly dispersed copper oxide on the hollow Fe-MFI zeolite CuO/FeS-1 was synthesized via an impregnation procedure and applied as heterogeneous catalyst for the tetracycline degradation. The synthesized CuO/FeS-1 was characterized by Scanning electron microscopy, Transmission electron microscopy , X-ray diffraction, UV–vis absorption spectrometry, Fourier transform infrared spectroscopy , Nitrogen adsorption-desorption and X-ray photoelectron spectroscopy. At pH = 7.0, CuO/FeS-1 revealed the highest tetracycline degradation rate of 99.6 % at experimental conditions: [TCE] = 30 mg/L, [PMS] = 1.0 g/L, [Catalyst] = 1.0 g/L, 333 K, and the largest degradation rate constant of 1.26 min −1 , which was 3.4 folds of FeS-1 zeolite and 1.8 folds of CuO . Electron paramagnetic resonance (EPR) technology disclosed that •OH, SO 4 • − , 1 O 2 and •O 2 − species were all the active species for CuO/FeS-1 zeolite in the tetracycline degradation. Furthermore, possible intermediates in the degradation of tetracycline over CuO/FeS-1 zeolite were identified with liquid chromatography-mass spectrometry (LC-MS).
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Journal of Materiomics
·
2023
·Vol. 10
·期 1
·37-44
·
IF 9.4
Wenxiu Li,Su Dun,Bin Xiao,Jun Wang,Xinba Yaer,Chun Ying,Ye Li,Xiaohuan Wang,Huijun Kang
Cu 2 Te-based materials are a type of superionic conductor belonging to the class of phonon-liquid electron-crystal materials and have achieved high ZT values by doping and nanostructuring. However, it is easy to form copper vacancies in Cu 2 Te which leads to an excessive carrier concentration and then results in a low Seebeck coefficient. Hence, controlling copper ion migration and optimizing carrier concentration is essential to improve the thermoelectric performance of Cu 2 Te. This paper reports high-performance Cu 2 Te Ag 2 Te composite with high application value in the low-middle temperature region, which is achieved by fine tuning the carrier concentration using Fe addition and non-stoichiometric Te, as well as controlling the thermal conductivity of composite. A high ZT of ∼1.2 is obtained in AgCu 0.97 Fe 0.03 Te 0.96 at a low temperature of 573 K. Meanwhile, the phase transition mechanism of Cu 2 Te Ag 2 Te and its effect on the thermoelectric transport performance are revealed that go beyond nanostructuring and single-doping, which provides a strong theoretical basis for research and performance improvement of thermoelectric materials in this system.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Yanqing Lai,Wenwen Liu,Jie Li,Kai Zhang,Furong Qin,Mengran Wang,Jing Fang
Fe-doped mesoporous anatase TiO 2 /amorphous carbon composites (FC–TiO 2 ) are synthesized by a wet chemistry process. With Fe-doping concentration increasing, the microstructures of FC-TiO 2 change from prism to nanoparticle , and finally turns block structure. When used as anode materials for sodium ion batteries, the FC-TiO 2 electrodes exhibit a maximum capacity of 304 mA h g −1 at 0.1 A g −1 after 50 cycles with good rate capability (198 mA h g −1 at 2 A g −1 ). Three synergic effects can be attributed to the improved electrochemical performance of FC-TiO 2 : (1) the high iron doping could largely narrow the band gap and restrain the growth of TiO 2 crystallite ; (2) the carbon coating offers a beneficial conductivity environment; (3) the porous structure can shorten the electronic sodium ion pathway during cycling. Moreover, this synthesis method is very easy for mass production. Therefore, FC-TiO 2 should be an attractive and promising candidate for anode material of SIBs.
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·382-388
·
IF 1.1
Cao Tian,Li Wei,Ren Lin,Song Tao,Song Jie,Lin Jiacheng,Yang Li,Liu Wenxiu,Wang Ping,Feng Shaojie
The adsorption of phosphate was conducted by the complex of chitosan/polyacrylamide/ferric(CS/PAM/Fe(III)) prepared. The SEM images and XPS spectra confirmed the successful adsorption of phosphate. The adsorption process was studied by varying the influencing aspects like pH, co-existing ions, contact time, and initial phosphate concentration. The experimental results indicate that the adsorptive capacity decreases with the increase of pH. However, it is commendable that there is still a adsorption capacity of more than 5 mg/g when the pH is 8–11. The adsorption kinetics can be accurately described by the pseudo-second-order model and is controlled by both chemisorption and surface diffusion. The adsorption process is a single layer adsorption. This paper proposed that the adsorption mechanism of CS/PAM/Fe(III) complex is the joint action of electrostatic attraction and ligand exchange.
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JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 3.6
Yang Liu,Guodong Cao,Xuelong Zhu,Yi Zhang,Chenglu Liang,Yukun Chen
Upcycling the wasted polyamide 6 (PA6) to its monomer caprolactam via depolymerization is a promising way to build the resource cycling and alleviate the environmental pollution. High efficient catalyst for PA6 depolymerization is desirable and crucial. Herein, a sulfonated Fe-MOF catalyst was designed and performed as solid acid catalyst for the PA6 depolymerization for the first time. Results showed that a 100% conversion of PA6 solid to water-soluble liquid products can be achieved at temperatures of 250°C after only 1-h reaction. LC/MS results indicated that the water-soluble products were mainly composed of caprolactam and their oligomers. Without catalyst, nearly no water-soluble products can be obtained at the same condition. Moreover, a high selectivity of 90% caprolactam production in the water-soluble liquid products was achieved at 260°C, 5 h. The reaction rate constants at 240°C, 250°C, and 260°C were determined to be 0.024, 0.033, and 0.064, respectively, with a Ea value of 101.8 kJ/mol, showing positive temperature dependent relationship. The comparison of catalytic performances over sulfonated Fe-MOFs, FeCl 3 ·6H 2 O and the pristine un-sulfonated Fe-MOF suggested the synergistic contribution of Fe sites (Lewis acid centers) and the sulfonic acid sites to the catalytic performances. Graphical Water soluble liquid products (100 wt.%) with a high selectivity of 90% caprolactam can be achieved by the addition of Fe-MOF catalyst under a mild condition through the synergistic catalytic contribution of Fe sites (Lewis acid centers) and the sulfonic acid sites.
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Molecular Catalysis
·
2025
·
IF 4.9
Can Sun,Runze Guo,Zhexiao Zhu,Shouxin Zhu,Jingyi Qu,Zijie Fang,Xiaolu Xu,Jiahui Lin,Yangben Chen,Shijie Zhang,Hui Zheng
Photocatalytic nitrogen fixation as a green, environmentally friendly, mild and low energy-consuming nitrogen fixation is considered as an ideal way to produce ammonia. Herein, inspired by nitrogen-fixing enzymes, the MOF materials Fe-sdc and Ti-sdc were synthesized by a simple solvothermal synthesis method using Fe and Ti as metal nodes and 4,4′-stilbenedicarboxylic acid (H 2 sdc) as a ligand. The ammonia production rates of Fe-sdc and Ti-sdc were 61.01 μmol g −1 h −1 and 46.84 μmol g −1 h −1 . The 15 N 2 isotope experiments were utilized to determine the nitrogen source for ammonia synthesis during the nitrogen fixation process of Fe-sdc. Various characterization analyses were also utilized to analyze the reasons for the better nitrogen fixation performance of the two catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Runlai Liu,Qi Chen,Jinjing Qiu,Cheng Liu,Jionghua Wu,Jimmy C. Yu,Ling Wu
The construction of metal–organic frameworks that possesses the tunable metal active sites and synergistic effect for the reactant activation is an attractive strategy for the optimization of photocatalytic performance. Herein, a series of MIL-88A(Fe 1-x Cu x ) were synthesized for photocatalytic nitrogen reduction reaction (NRR). It was characterized that the Fe 2+ and oxygen vacancies were produced in MIL-88A(Fe) due to the partly reduction of ligand fumaric acid in synthesis process. The substitution of Fe 3+ with Cu 2+ induces charge imbalance and lattice distortion, further increasing the content of Fe 2+ and oxygen vacancies. The optimal sample MIL-88A(Fe 0.95 Cu 0.05 ) (CMA-5 %) exhibits the highest nitrogen fixation performance of 68.6 μmol·g −1 ·h −1 , which is 8 times higher than that of the pristine material. It is attributable to the synergistic effect of the abundant Fe 2+ and oxygen vacancies as active sites to promote N 2 coordination and photogenerated carrier separation, resulting in the efficient conversion of activated N 2 to NH 3 . Furthermore, the in-situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy provide clear evidence of the behavior of the N 2 adsorption and activation on the catalyst. Finally, we propose a potential mechanism at molecular level regarding the relationship between the synergistic effect and the nitrogen fixation activity.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 14
·14350-14361
·
IF 2.914
Wu Kang,Si Xiongyuan,Jiang Jin,Si Youbin,Sun Kai,Yousaf Amina
In this study, a novel Fe–Mn binary oxide (FMBO), which combined the oxidation capability of iron and manganese oxides, was constructed to remove sulfamethoxazole (SMX) effectively using the simultaneous co-precipitation and oxidation methods, and the reaction products were probed by liquid chromatography-mass spectrometry (LC/MS). Particularly, FMBO-mediated transformation mechanisms of SMX were explored using radical scavengers and electron paramagnetic resonance (EPR). Results indicated that the best removal efficiency was obtained at a pH of 4.0, with the H 2 O 2 of 6.0 mmol/L and the FMBO dosage of 2.0 g/L, giving 97.6% removal of 10 mg/L SMX within 60 min. More importantly, we found that the hydroxyl (•OH) radicals generated by FMBO through Fenton-like reaction were responsible for the SMX oxidation. EPR studies were confirmed that the peak intensities of hydroxyl adduct decreased remarkably with increasing pH values. Moreover, the four SMX degradation intermediate products were detected by LC/MS and a reaction pathway for the possible mineralization of SMX, with •OH radicals as the main oxidant, was proposed. These findings provide a novel insight into the removal of SMX by FMBO-mediated radical reactions in aquatic environments. Moreover, this research suggested that FMBO can act as an efficient catalyst to remove SMX in hospital wastewater.
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ACS Nano
·
2025
·
IF 16
Ruonan Li,Runlin Ma,Li-Li Zhang,Wei Ma,Gonglei Shao,Xu Zhang,Yun Tian,Menggai Jiao,Zhen Zhou
To tackle the challenge in electrochemical nitrogen fixing and reduction in aqueous electrolytes, the conventional approach has been to suppress the competitive hydrogen evolution reaction. Nonetheless, proton provision is a crucial step in the nitrogen reduction pathway to produce ammonia, and a single active site faces the daunting task in striking a balance between high nitrogen fixation efficiency and fast protonation kinetics. This work presents a harmonic strategy featuring atomically dispersed dual Fe–Mo sites anchored in an N-doped carbon (FeMoNC) substrate, where a low-spin Fe center with enriched empty d orbitals aids in nitrogen fixation and activation, and the adjacent Mo site accelerates the protonation kinetics of N-containing intermediates at the Fe site via a distal associative mechanism. Driven by this co-catalytic mechanism, the FeMoNC catalyst achieves a Faradaic efficiency of 37.42%, marking a significant improvement of 7.8- and 10.6-fold over Fe or Mo single-atom catalysts, respectively. Furthermore, an excellent NH3 yield of 54.40 μg h–1 mgcat.–1 is realized in a flow cell by enhancing mass transfer. This study provides valuable insights into diatomic co-catalytic mechanisms for electrochemical ammonia synthesis.
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