JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 141
·期 4
·1413-1423
·
IF 2.471
Zhang Ming,Zhao Fengqi,Yang Yanjing,Li Hui,Gao Hongxu,Yao Ergang,Zhang Jiankan,An Ting,Jiang Zhoufeng
Bimetallic iron oxides (NiFe 2 O 4 , ZnFe 2 O 4 and CoFe 2 O 4 ) were prepared via the facile solvothermal method and characterized using SEM, TEM, XRD, FTIR, XPS and BET instruments. The catalytic behavior of the bimetallic iron oxides on the thermal decomposition of 5, 5′-bistetrazole-1, 1′-diolate (TKX-50) was studied using DSC and TG-DTG methods. Besides, the corresponding kinetic parameters of TKX-50 thermal decomposition were calculated by multi-kinetics methods including traditional, iso-conversional and iteration methods. The thermal decomposition peak temperature ( T p ) and the activation energy ( E a ) reduced obviously after the addition of bimetallic iron oxides. Among different bimetallic iron oxides, the ZnFe 2 O 4 has the best catalytic activity for TKX-50 thermal decomposition. The high thermal decomposition peak temperature ( T HDP ) and average apparent activation energy ( E a ) of TKX-50 were decreased by 47.0 °C and 34.34 kJ mol −1 in the presence of ZnFe 2 O 4 sample. The excellent catalytic activity of ZnFe 2 O 4 for thermal decomposition of TKX-50 makes it a promising combustion catalyst of insensitive solid propellants containing TKX-50.
研究领域:
材料科学
·
燃烧与推进
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物理化学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 8
·期 6
·1239-1248
·
IF 1.821
Shaolin Li,Yangyang Ding,Wei Wang,Hong Lei
Zero valent iron (ZVI) is increasingly used in large quantities for water treatment. In large-scale application of ZVI, a common question that engineers encounter is ZVI selection or its quality assurance and quality control (QA/QC). A facile method for assessing ZVI quality is proposed and studied in this work. The method is based on the Fe(III)–Fe(0) reaction that has a fast reaction rate, a known and simple stoichiometry, and an easy-to-assay product. The method is conducted by mixing the sample (e.g., testing ZVI) with concentrated Fe(III) solution (up to 3.0 g L−1) for 3–4 hours. The metallic iron (Fe(0)) content of the sample is obtained by assaying the final increase of the total dissolved iron, and its reactivity is quantified using the observed dissolution rate constants. The method is experimentally validated using 23 iron-based materials. Studies with reference iron powder and iron oxide demonstrate that the Fe(III) solution has satisfactory specificity in selecting Fe(0). Replicate experiments and t-test evaluation show the complete dissolution of the Fe(0) content in micron-scale ZVI and the high reproducibility of the method for measuring Fe(0). The accuracy and reliability of the method are studied using 15 commercial ZVIs of known Fe(0) purity, in a series of experiments using Fe(III), Cu(II) or trichloroethylene. The experiments show that the results from the proposed method are accurate and reliable, and that the method is a strong tool more effective than conventional techniques such as X-ray diffraction and BET-N2 adsorption. This work provides an easy and facile way for the quantitative assessment of the quality of metallic iron used for environmental clean-up, especially for the quick survey of a large number of iron samples on site. The method may also serve as a QA/QC procedure for ZVI in industrial-scale production.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Qingtao Wang,Xun Wei,Yanxia Wu,Guofu Ma,Ziqiang Lei,Shufang Ren
Electrocatalysts are useful in lowering the energy barrier in oxygen reduction reaction (ORR). In this study, a catalyst with neighboring Fe single-atom and cluster is created by adsorbing a bimetallic Fe complex onto N -doped carbon and then pyrolyzing it. The resulting catalyst has good performance and a half-wave potential of 0.89 V. When used in Zn-air batteries, the voltage drops by only 8.13 % after 145 h of cycling. Theoretical studies show that electrons transfer from neighboring clusters to single atoms and the catalyst has a lower d-band center. These reduce intermediate desorption energy, hence improving ORR performance. This work demonstrates the capacity to adjust the catalytic properties through the interaction of diverse metal structures, which helps to design more efficient catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2015
·
IF 3.453
M. Penchal Reddy,A.M.A. Mohamed
A series of metal ferrite mesoporous MFe 2 O 4 (M = Mn, Co, and Ni) nanospheres with an average diameter of about 100–300 nm were synthesized through a one-pot template-free solvothermal method in ethylene glycol (EG) solution. The effect of reaction parameters on products was characterized in detail by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, physical property measurement system, X-ray photoelectron spectroscopy and volumetric nitrogen adsorption. The XRD patterns indicate that all the samples were formed in single phase spinel structure. By changing Co 2+ to different cations, MnFe 2 O 4 , NiFe 2 O 4 , and ZnFe 2 O 4 with different magnetic properties could be obtained. The mesoporous MnFe 2 O 4 with a large surface area of 140.8 m 2 /g and an average pore size of 12.6 nm were obtained. Furthermore, magnetic properties of M-ferrite nanospheres could be tuned by changing substituted metal cations. The possible growth mechanism of mesoporous nanospheres was discussed on the basis of the investigation of reaction parameters.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Huiting Lin,Shijie Qiu,Zhihao Wu,Xiaoxia Ye,Minghua Liu
Efficient removal of oxytetracycline hydrochloride (OTC) from wastewater is of great significance but extremely challenging. Herein, a novel adsorbent lignin-based multi-metal ferrite biochar (FeNiZn-LBC) was synthesized through pyrolysis with controllable temperature and hydrothermal reaction using lignin of sinocalamus oldhami as raw material. The adsorption property of FeNiZn-LBC for OTC was systematically researched, and the results displayed that adsorption of FeNiZn-LBC to OTC accorded with the Langmuir model and the equilibrium adsorption capacity was 476 mg g −1 . Notably, FeNiZn-LBC can be regenerated with 0.100 mol L −1 NaOH. Additionally, we raised rational explanations for the mechanisms of adsorption behavior based on the zeta potential and XPS spectra. The adsorption of FeNiZn-LBC for OTC was mainly controlled by the electrostatic interactions, hydrogen bonds and complexation involving FeNiZn-LBC and OTC, especially the metal-oxide bond (M-O) generated after loaded with multi-metal ferrite played a positive role in the removal of OTC from water. Our work highlighted the potential of FeNiZn-LBC for excellent adsorption of OTC in next generation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Xiaofang Pan,Jiaxing Pu,Lingrui Zhang,Xiaobo Gong,Xuan Luo,Lu Fan
Sulfate radical-based advanced oxidation processes with (SR-AOPs) are widely employed to degrade organic pollutants due to their high efficiency, cost-effectiveness and safety. In this study, a highly active and stable FeNiP was successfully prepared by reduction and heat treatment. FeNiP exhibited high performance of peroxymonosulfate (PMS) activation for tetracycline hydrochloride (TC) removal. Over a wide pH range, an impressive TC degaradation efficiency 97.86% was achieved within 60 min employing 0.1 g/L FeNiP and 0.2 g/L PMS at room temperature. Both free radicals of SO 4 · - , ·OH, ·O 2 − and non-free radicals of 1 O 2 participated the TC degradation in the FeNiP/PMS system. The PMS activation ability was greatly enhanced by the cycling between Ni and Fe bimetal, and the active site regeneration was achieved due to the existence of the negatively charged P n− . Moreover, the FeNiP/PMS system exhibited substantial TC degradation levels in both simulated real-world disturbance scenarios and practical water tests. Cycling experiments further affirmed the robust stability of FeNiP catalyst, demonstrating sustained degradation efficiency of approximately 80% even after four cycles. These findings illuminate its promising potential across natural water bodies, presenting an innovative catalyst construction approach for PMS activation in the degradation of antibiotic pollutants.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2020
·
IF 2.726
Guoqiang Li,Feifei Li,Jianxin Liu,Caimei Fan
The nitrogen activation is the Achilles’ heel of photocatalytic nitrogen fixation . Herein, metal-organic frameworks (MOFs), for first time, are proposed to solve the above bottleneck. A series of Fe-Based MOFs (MIL-101(Fe), MIL-100(Fe), MIL-88(Fe)) demonstrated excellent photocatalytic nitrogen fixation activity. To gain insight into the reaction mechanism, MIL-101(Cr) and MIL-101(Fe), with same molecular structure except the central metal ions , selected for system comparison. Photocatalytic nitrogen fixation activity of MIL-101(Fe) and MIL-101(Cr) are 50.355 μmol L −1 h −1 and inactive, respectively. This suggested that the nitrogen fixation activity originated from the Fe catalytic center. The results of in situ FTIR and quantum computation verifies Fe catalytic center have a higher electron density, a lower reaction activation energy and more generation of N–H bond than those of Cr catalytic center. In view of the analogous outer electron configuration of Cr and Fe, it was suspect that two extra d-orbitals electronics of Fe element are the basic reason of the excellent photocatalytic nitrogen fixation activity. This work provides a new application of MOFs in photocatalytic nitrogen fixation field and emphasizes the vital of d-orbitals electronics during the nitrogen activation process.
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 THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 107
·期 5
·3252-3264
·
IF 3.9
Qingkai Tang,Xinhua Zhu
Half-metallic ferromagnets (HMFs) exhibit semiconductor behavior for one spin projection and metal characteristics for the other, which have promising applications in spintronics. It is a great challengeable for HMFs to have wide spin energy gap, large saturation magnetization ( M S ), and high Curie temperature ( T C ) simultaneously. Here, we report the Sr 1.5 Mn 0.5 Fe 0.5 Hf 1.5 O 6 (SMFHO) double perovskite compounds synthesized by solid-state reaction and display a magnetic T C up to 804 K due to the strong Mn 3+ (↑)Fe 3+ (↑) spin interactions, which is the reported record in perovskite-type HMFs so far. The measured M S value at 300 K was 4.87 μ B /f.u., and it further increased up to 6.09 μ B /f.u. at 2 K. The SMFHO powders exhibited butterfly-shaped magnetoresistance (MR)–H curve at 2 K, and the MR (2 K, 7 T) value was measured as −3.86% due to the intergranular magnetic tunneling effect. Variation of the resistivity of the SMFHO ceramics versus temperature exhibits a semiconductor behavior, and the electrical transport properties of the SMFHO ceramics are well studied by Mott's range jump model, thermally activated semiconductor conductance model and small polaron jumping model, respectively. The optical absorption spectrum of the SMFHO powders demonstrates an indirect optical bandgap of 3.56 eV. Our present work demonstrates the intriguing properties of the SMFHO oxides where high T C , wide energy gap, and large M S value are preserved at the same time, which open the way to their promising applications in advanced spintronic devices at or beyond room temperature.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Shuqiang Pang,Chengfeng Zhou,Yuanyuan Sun,Kewei Zhang,Wanneng Ye,Xiaoliang Zhao,Liping Cai,Bin Hui
Structural design of high-performing catalysts for boosting refractory organic pollutants degradation remains a great challenge. Herein, a natural wood-derived catalyst comprising of wood carbon and Fe/Co sites was proposed as the peroxymonosulfate (PMS) activator to enhance ciprofloxacin (CIP) pollutant degradation. The bimetallic Fe/Co sites were highly dispersed and stabilized on carbon surface. The carbon-based catalyst achieved 100% removal rate for CIP within 4 min. After four consecutive cycles, the removal rate still reached 92.8%, displaying separable and reusable ability of this catalyst. The carbon-based catalyst could also exhibit excellent degradation performance under a wide pH range of 2.0–8.0. Density functional theory (DFT) calculation revealed that Fe/Co sites at wood carbon had the high adsorption energy and induced interfacial electron transfer for enhanced breakage of O–O bond. The sulfate radical (SO 4 •− ), hydroxyl radical (•OH) and singlet oxygen ( 1 O 2 ) were main reactive oxygen species and their relative contribution was calculated to be 13.51%, 17.54% and 68.95%, respectively. The formed by-products and intermediates had almost no toxicity. This work proposes a new structural design of wood carbon-based system for enhancing antibiotic pollutant in aqueous environment, which facilitates the development of wastewater treatment technology.
研究领域:
环境科学
·
催化材料
·
废水处理
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Tianyu Gao,Ying Li,Ke Dai,Fangang Meng
In natural or engineered anaerobic environments, iron oxidation-driven microbial denitrification plays a critical role in the water or wastewater treatment. Herein, we report a previously unidentified metallic iron (Fe 0 )-dependent denitrification mode driven by the electro-syntrophic interaction between electroactive microorganism and denitrifier. In a model denitrifying consortium of Shewanella oneidensis and Pseudomonas aeruginosa , we find that P. aeruginosa can accept electrons for nitrate reduction via the constructed electron transfer system of Fe 0 – S. oneidensis – P. aeruginosa . In the electro-syntrophic consortium, the membrane-bound CymA–OmcA–MtrC protein complexes of S. oneidensis drive the generation, transfer and consumption of electrons, thus enabling modulation of microbial metabolic activity. Specially, using Fe 0 as the sole electron donor, S. oneidensis can act as a bio-engine to harvest electrons and conserve energy from Fe 0 biocorrosion. Electrons released by S. oneidensis are utilized by P. aeruginosa for accomplishing microbial denitrification. Metatranscriptomics analysis demonstrated that the direct electron cross-feeding process facilitates the expression of genes encoding for denitrification enzymes, intracellular electron transfer proteins, and quorum sensing of P. aeruginosa . The Fe 0 -dependent electronic syntrophy in this work could provide a metabolic window for the growth of denitrifiers that is a new insight into nitrate removal or global nitrogen cycle.
研究领域:
环境微生物学
·
生物地球化学
·
废水处理
·
微生物生态学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2025
·
IF 21.1
Teng Zong,Ming Tian,Chaojie Wang,Nanxin Wang,Jiachen Yang,Lin Li,Yujia Han,Xiaodong Wang
It is of great significance but challenge to achieve superior H 2 O splitting performance by tailoring active sites in novel Fe-based mixed oxides in order to boost H 2 O activation to achieve the oxidation of metallic Fe to Fe 3+ back into parent substrate rather than thermodynamically more favourable Fe 2+ (Fe-O v ) usually exhibiting low H 2 O activation in chemical looping water splitting (CLWS). Herein, we for the first time reported the performance of Ga-doped garnets (Y 3 Fe 2 Ga x Al 3-x O 12 abbreviated as YF 2 G x Al 3-x , x = 1 and 2) for CLWS which surpassed most of the state-of-the-art Fe-based oxides by virtue of marvelous peak H 2 production rate of 195.3 mL min −1 g −1 , H 2 productivity of 60.7 mL g −1 , 100 % H 2 purity and outstanding redox stability for YF 2 G 2 A 1 . It was clarified that Ga doping led to the formation of an interface with Fe 0 and Ga δ+ -O v in garnets, which synergistically improved H 2 O dissociation, leading to the direct oxidation of Fe 0 to Fe 3+ back into garnets and thus accounting for its prominent performance.
研究领域:
材料科学
·
能源化学
·
无机化学
·
催化化学
·
清洁能源技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Chao Gao,Jiaying He,Senjian Han,Yafei Guo,Shiqiang Wang,Tianlong Deng
Human health and sustainable development of nuclear energy pose new challenges for cesium removal. Herein, exploiting a novel metal ferrocyanides (MFCs) adsorbent is highly desirable for efficiently eliminate Cs + from contaminated water. Based on zinc phytate (Zn-PA), the newly synthesized hybrid material of ZnFC-PA exhibits top-class adsorption capacity ( q m = 559.76 mg/g) and excellent stability in a wide range of pH. The rapid adsorption kinetics and superior selectivity in the existence of numerous competing ions confirm the outstanding performance for cesium separation. Furthermore, the adsorption performance is roughly static after several cycles, and the distribution coefficient K d still remains at a high level (3.3 × 10 4 mL/g) even in practical geothermal water. The excellent adsorption performance and reusability make it a promising Cs + adsorbent to remediate the environment.
研究领域:
环境科学
·
核工程
·
材料科学
✓ 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）