EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Kaijie Wei,Xiaoya Feng,Hao Jiang,Chunzhong Li,Yanjie Hu
In recent years, the development of heat-resistant silicone rubber has been a research hotspot. In this paper, a kind of Fe doped TiO 2 nanoparticles (Fe-TiO 2 ) was prepared via flame spray pyrolysis, which can significantly improve the high temperature resistance of silicone rubber. The results show that, on the one hand, the prepared Fe-TiO 2 can inhibit the breakage of Si-O main chain; on the other hand, because Fe is doped into the lattice of TiO 2 , it causes the change of TiO 2 crystal phase and produces more oxygen vacancies, which is more beneficial to capture free radicals in silicone rubber matrix, so that Fe-TiO 2 can effectively inhibit the excessive cross-linking of silicone chain caused by methyl oxidation on the side of silicone rubber. TGA results showed that after adding Fe-TiO 2 , the 5 % thermal weight loss temperature of methyl vinyl silicone rubber increased from 392.8 °C to 435.6 °C.
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DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Qin Li,Jing Zhao,Peng Li,Zhengrong Xu,Jie Feng,Bo Chen,Rui Liu
Promotion of oxygen reduction reaction (ORR) kinetics, to a large extent, depends on the rational modulation of the electronic structure and mass diffusion of electrocatalysts. Herein, a ferrocene (Fc)–assisted strategy is developed to prepare Fc-trapped ZnMo–hybrid zeolitic imidazolate framework (Fc@ZnMo-HZIF-50) and the derived Fe single atom coupling with MoC nanoparticles, coembedded in hierarchically porous N-doped carbon cubes (MoC@FeNC-50). The introduced Fc is utilized not only as an iron source for single atoms but also as a morphology regulator for generating a hierarchically porous structure. The redistribution of electrons between Fe single atoms and MoC nanoparticles effectively promotes the adsorption of O2 and the formation of *OOH intermediates during the ORR process. Along with a 3D hierarchically porous architecture for enhanced mass transport, the as-fabricated MoC@FeNC-50 presents excellent activity (E1/2 = 0.83 V) and durability (only 9.5% decay in current after 40000 s). This work could inspire valuable insights into the construction of efficient electrocatalysts through electron configuration and kinetics engineering.
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Hui Shu,Tingrun Lai,Shanli Wang,Mengyao Li,Haoyu Li,Ting Chen,Xuechun Xiao,Yude Wang
Paraquat is a highly toxic herbicide, and its residue in food poses a huge threat to human health. High-sensitivity detection of trace paraquat is crucial but challenging. Herein, we theoretically predicted that FeCo-MOF materials with Fe and Co dual active sites have potential interactions with paraquat. Moreover, a porous FeCo-MOF materials with Fe and Co dual active sites were in-suit constructed on the surface of foam nickel by self-assembly strategy, and used for the electrochemical detection of paraquat. The electrochemical detection results indicate that the prepared FeCo-MOF foam nickel electrode exhibited ultra-high detection sensitivity (113.85 μA nM −1 cm −2 ) and trace detection limit (0.16 nM) in a wide range of paraquat concentration (1.00 nM–5.00 mM). In addition, we successfully used this FeCo-MOF foam nickel electrode for the detection of paraquat in apples, human serum, and fresh tea leaves (detection recovery is 97.00 %–99.99 %). Furthermore, the density functional theory (DFT) and X-ray photoelectron spectroscopy (XPS) confirm that Fe and Co are active sites for detecting paraquat, and the interaction between Fe and Co promotes highly sensitive detection of trace paraquat. Therefore, this work provides strategies and comprehension for designing and modulating active sites at the microscopic level to improve sensitivity for detecting toxic pesticides.
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DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2018
·
IF 6.377
Hui Li,Fengsheng Liu,Xiaoling Ma,Zhongjie Wu,Yan Li,Linhua Zhang,Shoujun Zhou,Yaxin Helian
Strontium oxide (SrO) is restricted by poor reusability and pore structure in catalyzing transesterification for biodiesel production. To address this problem, metal organic frameworks is employed as a carrier to support strontium carbonate by mechanical mixing method (MM) and in situ titration method (ST), and then calcined under inert atmosphere to obtain the catalyst of MM–SrO and ST–SrO. As a comparison, the reusability of pure SrO is compared and the homogeneous contribution of leached active sites for ST–SrO and MM–SrO are also assessed. The catalysts are characterized by TG, XRD, FTIR, EDS, Hammett indicator titration, nitrogen adsorption–desorption, and VSM. From the catalyst reusability, MM–SrO exhibits the excellent performance, where the maximum conversion of 96.19% is achieved at molar ratio of methanol to oil 12, catalyst addition 8 wt% (refer to oil), reaction temperature 65 °C within 30 min. And the conversion of 82.49% is still obtained at the third cycle, which could be easily separated from the mixture by external magnetic field after each cycle as well. In order to optimize the activation condition and investigate MM–SrO deeply, thermal characteristics of its corresponding precursor are further evaluated, where the TG experiments are conducted at heating rate of 20, 30, and 40 °C/min. and kinetic parameters are calculated through model–free method and Avrami theory, respectively.
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DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 16
·23924-23941
·
IF 0
Li Kaiqian,Zhang Xupeng,Huang Xueqin,Li Xianghong,Chang Qiaowen,Wang Jing,Deng Shuduan,Zhu Gang
In response to the escalating concerns over antibiotics in aquatic environments, the photo-Fenton reaction has been spotlighted as a promising approach to address this issue. Herein, a novel heterogeneous photo-Fenton catalyst (Fe 3 O 4 /WPC) with magnetic recyclability was synthesized through a facile two-step process that included in situ growth and subsequent carbonization treatment. This catalyst was utilized to expedite the photocatalytic decomposition of ciprofloxacin (CIP) assisted by H 2 O 2 . Characterization results indicated the successful anchoring of MIL-101(Fe)-derived spindle-like Fe 3 O 4 particles in the multi-channeled wood-converted porous carbon (WPC) scaffold. The as-synthesized hybrid photocatalysts, boasting a substantial specific surface area of 414.90 m 2 ·g −1 and an excellent photocurrent density of 0.79 μA·cm −2 , demonstrated superior photo-Fenton activity, accomplishing approximately 100% degradation of CIP within 120 min of ultraviolet-light exposure. This can be attributed to the existence of a heterojunction between Fe 3 O 4 and WPC substrate that promotes the migration and enhances the efficient separation of photogenerated electron–hole pairs. Meanwhile, the Fe(III)/Fe(II) redox circulation and mesoporous wood carbon in the catalyst synergistically enhance the utilization of H 2 O and accelerate the formation of •OH radicals, leading to heightened degradation efficiency of CIP. Experiments utilizing chemical trapping techniques have demonstrated that •OH radicals are instrumental in the CIP degradation process. Furthermore, the study on reusability indicated that the efficiency in removing CIP remained at 89.5% even through five successive cycles, indicating the structural stability and excellent recyclability of Fe 3 O 4 /WPC. This research presented a novel pathway for designing magnetically reusable MOFs/wood-derived composites as photo-Fenton catalysts for actual wastewater treatment.
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DOI
PubMed
ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Chongxian He,Xiangyang Zeng,Liuyimei Yang,Shiwei Zhong,Shuping Peng,Wenjing Yang,Cijun Shuai
Fe has immense potential for biodegradable orthopedic applications, but it degrades slowly in the physiological environment. Inducing galvanic couple by alloying Cu to Fe using ball milling is a promising approach. However, the ductile nature of Cu leads to the cold welding of a large amount of Cu powder during ball milling, which makes it difficult to disperse uniformly in the Fe matrix. Here, a Fe–CuO implant with highly dispersed Cu particles in the matrix was developed by shift-speed ball milling and selective laser melting. Specifically, copper oxide (CuO) particles were selected as precursors and dispersed in Fe powders by ball milling since they were brittle and would not be cold-welded during ball milling. After further milling in higher energy, it was found that CuO particles reacted with Fe and generated Cu particles through a stress-activated redox reaction. Subsequently, the obtained powders were prepared into a Fe–CuO implant using selective laser melting. Microstructure examination revealed that the Cu phases in the implant were dispersed evenly in the Fe matrix, which was considered to establish a large number of galvanic couples and aggravated the galvanic corrosion tendency. Electrochemical tests indicated that the implant had improved performance in degradation behavior in terms of high corrosion current density (22.4 μA/cm2), low corrosion resistance (1319 Ω cm2), and good degradation stability. In addition, it presented antibacterial effects against Escherichia coli and Staphylococcus aureus by diffusion mechanisms with killing rates of 90.7 and 96.7%, respectively, as well as good cytocompatibility.
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jianqing Ma,Ziheng Huang,Hao Xi,Yuezhong Wen
ABSTRACT Metal-doping graphitic carbon nitride (g-C 3 N 4 ) is a potential catalyst for the Fenton-like reaction. Selecting an appropriate supporter for this material is essential to improve its catalytic ability and lower the costs. Three common supporters, graphite, activated carbon, and SBA-15, were employed to investigate their effects on the catalyst structure and performances. Results show that graphite could increase the active Fe–N centers due to geometric effects and promote the electron transfer by π–π stacking, and therefore, the Fe-doping g-C 3 N 4 /graphite (FegN/G) composite displayed excellent catalytic ability for the bisphenol A (BPA) removal. In addition, magnetic catalyst was further fabricated through a simple coprecipitation method using Fe 3 O 4 and chitosan-Fe hydrogel. The magnetic catalyst kept in dozens of micrometer size range as well as high activity for the Fenton reaction. Hydroxyl radicals were generated during the reaction process, and 99.9% of the original BPA was therefore degraded and mineralized in 1 h. More importantly, it also exhibits a good reusability and stability, as well as a quick separation performance from the solution when using a magnet, indicating that this magnetic FegN/G composite would be a promising Fenton-like catalyst in practical applications.
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DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Jun Wu,Wenzhong Zhang,Chunping Li,Erdan Hu
The effects of Fe(III) and Cu(II) on the sorption of atrazine (AT) and prometryn (PY) on clay minerals were investigated both preloaded and in solution. For smectite , Fe(III) preloading greatly enhanced AT and PY sorption at pH 4.0 and 6.0 but diminished AT sorption at pH 8.0. Cu(II) preloading promoted AT and PY sorption under alkaline conditions but suppressed AT sorption at pH 4.0. The adverse effects were not obvious for PY. While for illite and kaolinite , Fe(III) and Cu(II) had little or promotion effects due to the lower contents of them in these two minerals. In the co-sorption studies, for smectite, AT sorption remained at pH 4.0 and increased at pH 6.0 and 8.0, while PY sorption was inhabited over the pH range of 4.0–8.0 in the presence of Fe(III). AT and PY sorption were not affected by Cu(II) except for PY at pH 8.0, in which case, the sorption was promoted. For illite and kaolinite , Fe(III) and Cu(II) generally enhanced AT and PY sorption.
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DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2025
·Vol. 95
·期 6
·1455-1463
·
IF 0.8
Chen X.,Xiu X.,Zhuang X.,Sun H.,Dong C.
Developing cost-effective and efficient non-precious metal oxygen reduction catalysts (ORRs) is crucial for advancing renewable energy technologies. This study reports the synthesis and characterization of a novel non-precious metal catalyst, N–C–Fe-600, synthesized via a simple two-step method. Pyrolysis of NH 2 –MIL-88(Fe) under an inert atmosphere, followed by acidic treatment, yielded a porous N–C–Fe-600 material featuring a high surface area and a substantial concentration of active Fe–N x sites. Electrochemical characterization revealed that N–C–Fe-600 exhibits ORR activity comparable to commercial Pt/C catalysts, along with significantly enhanced stability and methanol tolerance. The catalyst demonstrates a near-ideal four-electron transfer pathway, suggesting its potential as a viable alternative to platinum-based catalysts in fuel cells.
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DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Shanshan Chen,Kang Wen,Xiaoting Zhang,Ruize Zhang,Runping Han
Metal organic frameworks are attracting scientific interest in adsorption applications owing to their large surface area and controllable pore size or shape over both microporous and mesoporous domains. Based on this, an iron(III) trimesic acid MIL-100(Fe) was facilely synthesized by hydrothermal treatment and used as adsorbent to remove neutral red (NR) from aqueous solution. MIL-100(Fe) was characterized using X-ray diffraction, scanning electron microscopy and transform infrared spectroscopy. MIL-100(Fe) was studied in view of the adsorption isotherms, thermodynamics, kinetics, and regeneration of the adsorbent. The adsorption kinetics data of NR were found to be in agreement with pseudo-second-order model. Temkin model was observed to be more suitable than Freundlich and Langmuir models in describing the adsorption isotherm. The maximum adsorption quantity was 333 mg g –1 at 313 K from Langmuir model. Thermodynamic parameters indicated that the NR adsorption process was endothermic and spontaneous. The NR-loaded MIL-100(Fe) adsorbent was regenerated and reused using pH = 2, 75% ethanol. A single-stage batch design for NR adsorption onto MIL-100(Fe) was also presented based on Temkin isotherm model equation. Based on the findings, MIL-100(Fe) is a promising adsorbent for the removal of cationic dyes from solution and thus can be used in practical application.
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DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 26
·4794-4800
·
IF 5.52
Hui Zhu,Gaojian Chen,Zhenbiao Zhang,Nianchen Zhou,Weidong Zhang,Xiulin Zhu
Fe(0) powder-catalyzed one-pot reaction was successfully employed to design linear and star polymers in a well-controlled manner by combining ambient temperature living radical polymerization and click chemistry. The polymerization behavior possessed the characteristics of “living”/controlled radical polymerization: the first-order kinetic plots, narrow molecular weight distribution (PDI < 1.4), the linear relationship between molecular weights and the monomer conversions and the successful chain-extension with a NIPAAM monomer. Furthermore, the NMR and MALDI-TOF-MS data indicated that the Fe(0)-catalyzed one-pot strategy is different from our reported Cu(0)-catalyzed one-pot strategies to make the targeted polymers.
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DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Mutian Zhang,Ziying Ji,Shijie Pan,Xiang Liu,Wei Zheng,Jiajia Wang,Guobing Ying
In this study, Fe-doped Co3O4 nanoparticles were synthesized using a hydrothermal method followed by ultrasonic cell disruption to enhance the alkaline hydrogen evolution reaction (HER) performance. Through a dual-modification strategy combining elemental doping and morphology engineering, structural characterizations confirmed that Fe doping induces lattice distortions and optimizes the electronic structure, while ultrasonic cell disruption effectively reduces particle size to ~50 nm and increases active site density. The 10Fe-Co3O4 Ultrasonicated Nanoparticles (UNPs) catalyst showed remarkable HER performance, with overpotentials of 210.7 mV and 264.0 mV at 10 and 100 mA/cm2, respectively, and a Tafel slope of 75.2 mV/dec in 1 M KOH. DFT calculations indicate that Fe doping improves water adsorption, lowers energy barriers in the Volmer and Heyrovsky steps, and shifts the d-band center, thereby accelerating HER kinetics. The 10Fe-Co3O4 UNPs catalyst also demonstrated excellent durability, maintaining stable performance over 24 hours under high current densities. This work highlights the potential of Fe-doped Co3O4 as a cost-effective, high-efficiency, non-noble metal-based catalyst for HER, providing valuable insights into catalyst design and advancing sustainable hydrogen production technologies.
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