JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Ningning Zhao,Zhong Yu,Haixia Ma,Ergang Yao,Ting An,Fengqi Zhao,Xiaojiao Yu
Fe 2 O 3 /zeolitic imidazolate framework-8 (ZIF-8) architectures were successfully prepared by a polyvinylpyrrolidone (PVP)-assisted method, which can be as an effective potential catalyst for promoting the thermal degradation of nitrocellulose (NC). Thermal behavior and degradation kinetics of catalyst-NC mixtures were studied using the TG/DTG and DSC methods, and found that the Fe 2 O 3 /ZIF-8-NC pyrolysis possessed a total degradation of 77.96%, a maximum pyrolysis rate temperature of 194.5 °C, and the lowest activation energy of 179.4 ± 16.1 kJ mol −1 , confirming a better thermocatalytic performance of Fe 2 O 3 /ZIF-8 when compared to Fe 2 O 3 and ZIF-8 for NC thermolysis. Furthermore, it can be inferred from the isoconversional analysis, which employs a modified fitting algorithm, that catalyst-NC mixtures and pure NC adhere to the reconstructed “n-order” reaction models. This work showed how a catalyst of the metal oxide/metal-organic frameworks (MOFs) type could improve the pyrolysis of NC, which could serve as a significant reference for the development of additional catalysts of the metal oxide/MOFs for use in NC-based energetic materials.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2021
·Vol. 21
·期 12
·6196-6204
·
IF 0
Wen Shu,Xing Weiping,Gao Lingxue,Zhao Shuping
This study aimed to investigate the effects of DMSO@γ-Fe2O3 nanomagnetic fluid thermotherapy combined with the chemotherapy drug carmustine on cervical cancer cells under a certain intensity of alternating magnetic field. And the role of Mir-590-3P
in the development and progression of cervical cancer. The optimal thermotherapy concentration of γ-Fe2O3 nanomaterials on cervical cancer cells was determined by in vitro heating. In addition, the MTT colorimetric method was used to evaluate the toxic
effect of γ-Fe2O3 magnetic nanoparticles on cervical cancer cells, and the optimal therapeutic concentration of carbachol on cervical cancer cells was optimized (0.015 g · L−1). The cervical cancer cells were divided into control,
γ-Fe2O3 hyperthermia, chemotherapy, and DMSO@γ-Fe2O3 combined chemotherapy groups. After 2 h exposure to hypothermic conditions, flow cytometry was used to assess cell apoptosis for each group. The heating effect of the
γ-Fe2O3 magnetic nanomaterials was apparent. When the concentration of γ-Fe2O3 was ≥6 g· L−1, the temperature rise above 41 °C. γ-Fe2O3 is non-toxic to cervical
cancer cells and has good biocompatibility. Taking the drug concentration of IC25 as the working concentration of this study, the working concentration of carmustine was 0.015 g · L−1. Both the 41 °C heat treatment and chemotherapy alone had a killing effect on
glioma and cervical cancer cells (P < 0.05). Additionally, the combined inhibitory effect of DMSO@γ-Fe2O3 nanomagnetic fluid thermotherapy and drugs at this temperature was significantly stronger than that of thermotherapy and chemotherapy alone (P <
0.05). For the control, gamma-Fe2O3 hyperthermia, chemotherapy, and DMSO@γ-Fe2O3 combined chemotherapy groups, the apoptosis rates of the cervical cancer cells were 1.4%, 18.6%, 24.12%, and 38.97%, respectively. DMSO@γ-Fe2O3
nanomagnetic fluid thermotherapy combined with the chemotherapeutic drug carmustine exerted a noticeable toxic effect on the cervical cancer cells, and DMSO@γ-Fe2O3 significantly enhanced the killing effect of carmustine on cervical cancer cells.
研究领域:
肿瘤学
·
纳米医学
·
分子生物学
·
癌症治疗
✓ 已验证
DOI
PubMed
JOURNAL OF ALLOYS AND COMPOUNDS
·
2016
·
IF 3.014
Huilin Zhang,Xiaoyu Liang,Chao Yang,Chunge Niu,Jide Wang,Xintai Su
Nano γ-Fe 2 O 3 modified bentonite magnetic composites (γ-Fe 2 O 3 /Bent) were synthesized via an annealing approach of the ferric oleate and bentonite compounds. The γ-Fe 2 O 3 nanoparticles with narrow size distribution and an average diameter of 32 nm were equably dispersed on the surface and between layers of the bentonite nanosheets , which mainly owed to the complete mixture of ferric oleate and hydrophobic modified bentonite. The γ-Fe 2 O 3 /Bent composites exhibited typical ferromagnetic characteristics with the saturation magnetization of 22.31 emu/g and coercivity of 209 Oe. Adsorption performance measurement indicated that the γ-Fe 2 O 3 /Bent composites are a kind of excellent adsorbent with fast adsorption rate, high adsorption capacity, 99.99% removal rate and easily magnetic separation process for the removal of cationic dye methylene blue (MB). Adsorption kinetics and isotherms were studied to describe the adsorption process , and the electrostatic adsorption mechanism was confirmed by zeta potential measurement.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 24
·16790
·
IF 4.614
Mei-e Zhong,Gongsong Tong,Jingchun Sun,Nan Zhou,Chunxia Ding,Xiangying Liu,Austin Merchant,Xuguo Zhou
Biochar loading mixed–phase iron oxide shows great advantages as a promising catalyst owing to its eco–friendliness and low cost. Here, γ–Fe2O3−x@biochar (E/Fe–N–BC) composite was successfully prepared by the sol–gel method combined with low–temperature (280 °C) reduction. The Scanning Electron Microscope (SEM) result indicated that γ–Fe2O3−xparticles with the size of approximately 200 nm were well–dispersed on the surface of biochar. The CO derived from biomass pyrolysis is the main reducing component for the generation of Fe (II). The high content of Fe (II) contributed to the excellent catalytic performance of E/Fe–N–BC for quinclorac (QNC) degradation in the presence of peroxymonosulfate (PMS). The removal efficiency of 10 mg/L of QNC was 100% within 30 min using 0.3 g/L γ–Fe2O3−x@biochar catalyst and 0.8 mM PMS. The radical quenching experiments and electron paramagnetic resonance analysis confirmed that •OH and SO4•−were the main radicals during the degradation of QNC. The facile and easily mass–production of γ–Fe2O3−x@biochar with high catalytic activity make it a promising catalyst to activate PMS for the removal of organic pollutants.Keywords:low–temperature reduction;γ–Fe2O3;biochar;peroxymonosulfate;quinclorac
研究领域:
环境化学
·
催化
·
水处理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 9
·4272-4282
·
IF 3.925
Yu Lei,Huiqi Wu,Jianfeng Ma,Hao Cheng,Sridhar Komarneni
Layered α-Fe2O3/CuS nanoflowers with abundant active sites were synthesized by a hydrothermal method. The heterogeneous composite catalyst of α-Fe2O3/CuS nanoflowers exhibited a remarkable degradation capacity of 97.8% within 25 min for the Orange II (OII) dye under visible light, which was attributed to the synergistic effect of Na2S2O8 to generate ˙SO4− and ˙OH radicals. The initial pH tests revealed that this system showed better adaptability for its application in a wider pH range (pH = 3–9). In addition, the degradation of different azo dyes such as methylene blue (MB), Orange G (OG) and malachite green (MG) was also studied under the same conditions. The catalyst was characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to analyze its size, morphology, valence states of elements and chemical components. α-Fe2O3/CuS was further characterized using a vibrating sample magnetometer (VSM) and diffuse reflectance spectroscopy (DRS) to demonstrate its magnetic properties and light absorption capacity. Moreover, α-Fe2O3/CuS showed good recovery and reuse performance as a catalyst after four repeated cycles. A possible mechanism of degradation was proposed by quenching and ESR experiments, which revealed that the highly active species of ˙SO4−, ˙OH and ˙O2− enhanced the photocatalytic performance of the photocatalytic system.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2022
·Vol. 12
·期 8
·2659-2669
·
IF 6.177
Maoqi Li,Jian Wu,Guoliang Shen
Photocatalytic water splitting for hydrogen production and water pollutant degradation is a frontier topic to solve energy and environmental problems. In particular, applying electric and magnetic fields on photocatalysts is the most promising solution to improve their catalytic activity. In this work, bifunctional catalyst PDDA-coated β-Fe2O3 nanoclusters (β-Fe2O3@PDDA) have been successfully synthesized by a simple one-pot method at 200 °C. β-Fe2O3@PDDA exhibits excellent photoelectrocatalytic (PEC) activity for the oxygen evolution reaction (OER) with an overpotential of 300 mV, Tafel slope of 45 mV dec−1 and good catalytic stability. Moreover, β-Fe2O3@PDDA exhibited a good magnetic field-enhanced photocatalytic (MF-PC) RhB degradation activity under artificial simulated sunlight; the photocatalytic efficiency can be improved by 44% under an external magnetic field than that without a magnetic field. The surface PDDA-coated β-Fe2O3 can be stably dispersed in water for more than 10 days without agglomeration, which is of great significance for the MF-PC degradation of water pollutants in practical applications. The high catalytic activity for MF-PC is attributed to the magnetic field-suppressed electron–hole recombination and the spin-polarized properties of β-Fe2O3 in photocatalysis. Our study provides a new strategy for the preparation of highly dispersed β-Fe2O3 nanoclusters under mild conditions and the development of ultrastable organic/inorganic composite photocatalysts. This opens up a new avenue for developing electric and magnetic field-enhanced photocatalysts for use in clean energy and environmental control.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Wenfang Miao,Shaopeng Li,Xingru Cao,Enmin Lv,Hongtao Yu,Xuefeng Zhang,Xinglong Dong
The sluggish kinetics of oxygen reduction reaction at the cathode is one of the obstacles of the next-generation energy conversion system such as fuel cell and Zn-air battery. Here, a simple pyrolysis method was used to transform delignification-treated balsa wood into nitrogen-doped porous layered carbon materials. γ-Fe 2 O 3 nanocrystals were supported on N-doped wood-derived carbon materials. The prepared Fe 2 O 3 -CW 1000 catalyst exhibits superior ORR performance with a high onset potential of 0.98 V RHE in alkaline environment. This is consistent with the potential of commercial Pt/C. The superior ORR activity is attributed to the fact that γ-Fe 2 O 3 nanoparticles promote the activity of Fe-N x sites. And the N-enriched porous carbon matrix facilitates the faster electron movement on the catalyst surface and the full exposure of the active sites.
研究领域:
材料科学
·
电化学
·
能源转换系统
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 18
·2579
·
IF 5.3
Yue Chang,Minmin Han,Yehui Ding,Huiyun Wei,Dawei Zhang,Hong Luo,Xiaogang Li,Xiongbo Yan
Effectively regulating and promoting the charge separation and transfer of photoanodes is a key and challenging aspect of photoelectrochemical (PEC) water oxidation. Herein, a Ti-doped hematite photoanode with a CoFe-LDH cocatalyst loaded on the surface was prepared through a series of processes, including hydrothermal treatment, annealing and electrodeposition. The prepared CoFe-LDH/Ti:α-Fe2O3photoanode exhibited an outstanding photocurrent density of 3.06 mA/cm2at 1.23 VRHE, which is five times higher than that of α-Fe2O3alone. CoFe-LDH modification and Ti doping on hematite can boost the surface charge transfer efficiency, which is mainly attributed to the interface interaction between CoFe-LDH and Ti:α-Fe2O3. Furthermore, we investigated the role of Ti doping in enhancing the PEC performance of CoFe-LDH/Ti:α-Fe2O3. A series of characterizations and theoretical calculations revealed that, in addition to improving the electronic conductivity of the bulk material, Ti doping also further enhances the interface coupling of CoFe-LDH/α-Fe2O3and finely regulates the interfacial electronic structure. These changes promote the rapid extraction of holes from hematite and facilitate charge separation and transfer. The informative findings presented in this work provide valuable insights for the design and construction of hematite photoanodes, offering guidance for achieving excellent performance in photoelectrochemical (PEC) water oxidation.
研究领域:
材料科学
·
能源转换
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Xiang Zhang,Weihang Li,Jin Zhang,Haoshen Zhou,Miao Zhong
Electrochemical nitrate (NO 3 − ) reduction offers a promising route for ammonia (NH 3 ) synthesis from industrial wastewater using renewable energy. However, achieving selective and active NO 3 − to NH 3 conversion at low potentials remains challenging due to complex multi-electron transfer processes and competing reactions. Herein, we tackle this challenge by developing a cascade catalysis approach using synergistic active sites at Cu-Fe 2 O 3 interfaces, significantly reducing the NO 3 − to NH 3 at a low onset potential to about +0.4 V RHE . Specifically, Cu optimizes *NO 3 adsorption, facilitating NO 3 − to nitrite (NO 2 − ) conversion, while adjacent Fe species in Fe 2 O 3 promote the subsequent NO 2 − reduction to NH 3 with favorable *NO 2 adsorption. Electrochemical operating experiments, in situ Raman spectroscopy, and in situ infrared spectroscopy consolidate this improved onset potential and reduction kinetics via cascade catalysis. An NH 3 partial current density of ~423 mA cm −2 and an NH 3 Faradaic efficiency (FE NH3 ) of 99.4% were achieved at −0.6 V RHE , with a maximum NH 3 production rate of 2.71 mmol h −1 cm −2 at −0.8 V RHE . Remarkably, the half-cell energy efficiency exceeded 35% at −0.27 V RHE (80% i R corrected), maintaining an FE NH3 above 90% across a wide range of NO 3 − concentrations (0.05−1 mol L −1 ). Using 15 N isotopic tracing, we confirmed NO 3 − as the sole nitrogen source and attained a 98% NO 3 − removal efficiency. The catalyst exhibit stability over 106-h of continuous operation without noticeable degradation. This work highlights distinctive active sites in Cu-Fe 2 O 3 for promoting the cascade NO 3 − to NO 2 − and NO 2 − to NH 3 electrolysis at industrial relevant current densities.
研究领域:
环境科学
·
电化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Manufacturing Processes
·
2021
·
IF 5.01
Qianqian Chen,Tiesong Lin,Jiujie Xu,Wenhang Niu,Panpan Lin,Peng He
Bismuth composite glasses doped with Fe 2 O 3 nanoparticles were utilized to braze yttrium iron garnet (YIG) ferrite. The effect of Fe 2 O 3 doping on the thermal property and structure of the composite glasses was studied. The microstructure, mechanical and dielectric properties of YIG/YIG joint were systematically investigated as well. The Fe 2 O 3 doping promoted the crystallization of Bi 2 SiO 5 and the conversion of [BO 4 ] units to [BO 3 ] units. [BO 3 ]/[BO 4 ] in the glass matrix reacted with Y 3+ and Fe 3+ diffusing from YIG base material to form Fe 2 O 3 blocks and lamellar YBO 3 . The gray YBO 3 changed from lamellar phase to needle-like phase with the brazing temperature increasing. The concentration of Fe 3+ increased along with the dissolution of Fe 2 O 3 nanoparticles, resulting in the extensive formation of Fe 2 O 3 nuclei. Consequently, the amount of the Fe 2 O 3 blocks increased with the Fe 2 O 3 doping increasing. The shear strength could reach 68.4 MPa via the combined strengthening of block Fe 2 O 3 and gray YBO 3 phases. The dielectric constant of YIG/YIG joint decreased with the Fe 2 O 3 doping and brazing temperature increasing due to the growth of Fe 2 O 3 and YBO 3 phases. The dielectric loss tangent of the YIG/YIG joint was close to that of the original YIG material with the frequency increasing.
研究领域:
材料科学
·
电子材料
✓ 已验证
DOI
高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART B-APPLIED BIOMATERIALS
·
2018
·Vol. 107
·期 3
·511-520
·
IF 3.373
Moyuan Qu,Wenqian Xiao,Jiarong Tian,Song Wang,Hong Li,Xue Liu,Xiaoling Yang,Bo Li,Xiaoling Liao
Nanofibrous poly( l -lactic acid) (PLLA) microspheres are extensively studied to be used as cell carriers in the field of tissue engineering because the unique structure can promote cell proliferation and migration. But as injectable scaffold materials, PLLA microspheres easily run off to the soft tissue space because of the lack of cohesive force. It will affect the treatment efficiency and even cause additional inflammatory response. In order to overcome this disadvantage, superparamagnetic γ-Fe 2 O 3 nanoparticles assisted with oxidative polymerization of dopamine were used for surface modification of PLLA microspheres in this study. The results showed that this surface modification had no obvious cytotoxicity, and the modified microspheres possessed the ability to carry seed cells to controllably move to the defect sites with the guidance of magnetic field, which may be able to increase the repair efficiency. Moreover, the characteristic nanofibrous structure was not destroyed after modification, which was able to promote biological activity of cells. This work provides a novel way to produce superparamagnetic nanofibrous microspheres designed for cell microcarriers. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2018. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 107B: 511–520, 2019.
研究领域:
生物医学材料
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Arabian Journal of Chemistry
·
2020
·
IF 4.762
Kechen Song,Shuo Wang,Qiang Sun,Deping Xu
Nano-sheets Al 2 O 3 supported CeO 2 -Fe 2 O 3 binary oxides were prepared by the vacuum impregnation method. The structural and textural properties were characterized by pertinent techniques, and the materials were evaluated as catalysts for the oxidative dehydrogenation of ethylbenzene with carbon dioxide (CO 2 -ODEB). The characterization results show that all samples maintain the hierarchical structure, and CeO 2 -like and Fe 2 O 3 -like solid solutions were formed when changing the Ce-to-Fe molar ratio. The catalytic performances indicate that CeO 2 -Fe 2 O 3 binary oxides were effective for CO 2 -ODEB, and the activity is determined by mobile oxygen, which can facilitate the dehydrogenation process. The DFT studies further identified the reaction pathway and rate-determining step. The inter-transmission of oxygen species and the presence of CO 2 refill the oxygen vacancies and restore the redox cycle of CeO 2 -Fe 2 O 3 binary oxides.
研究领域:
催化化学
·
材料科学
·
理论计算化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）