JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2012
·
IF 2.353
Gang Jian,Dongxiang Zhou,Junyou Yang,Hui Shao,Fei Xue,Qiuyun Fu
BaTiO 3 /CoFe 2 O 4 bilayer films on high temperature resistant Al 2 O 3 /Pt substrates were fabricated using the electrophoretic deposition (EPD) method. Powder synthesis , suspension preparation and kinetics of deposition were investigated in detail. Two different sintering temperatures were tested and the resultant microstructure and properties of ceramic films were investigated. The composite films sintered at a temperature of 1200 °C/2 h yielded optimal microstructures and properties. The obtained bilayer films had a dense structure with no phase diffusion or passive layer. Besides to ferroelectric and magnetic properties, magnetoelectric (ME) coupling properties were also confirmed by the magnetic anisotropy and magnetic field induced polarization investigation. The composite films showed a increased P s from 16.2 to 16.85 μC/cm 2 with variations Δ P s of 4% when the magnetic field was applied in parallel direction and a decreased P s from 16.2 to 14.9 μC/cm 2 with variations Δ P s of −8% when a normal direction field was applied.
研究领域:
材料科学
·
物理学
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2015
·Vol. 40
·期 14
·4777-4785
·
IF 3.313
Jianmin Chen,Zhang-Hui Lu,Yuqing Wang,Xiangshu Chen,Lei Zhang
In this paper, we reported a facile and effective approach for fabrication of SiO 2 –CoFe 2 O 4 supported dispersed Ag nanoparticles (NPs). The as-synthesized nanocomposites (NCs) were characterized by XRD , TEM, EDX, ICP , XPS and N 2 adsorption-desorption, and used as catalyst for H 2 production from hydrolysis of ammonia borane (AB). A poorly active catalyst of Ag NPs was dramatically converted into a highly active catalyst, in the presence of inactive SiO 2 –CoFe 2 O 4 support. Among all the Ag(0)/SiO 2 –CoFe 2 O 4 NCs catalysts tested, the Ag loading of 0.98 wt% exhibited the highest catalytic activity toward hydrolysis of AB with a highly turnover frequency of TOF = 264 min −1 at room temperature, being higher than that of most reported Ag-based catalysts. Especially, these catalysts can be readily separated from the solution for recycle purpose, and can keep the high activity even after seven times of recycle. These results showed that Ag(0)/SiO 2 –CoFe 2 O 4 NCs prepared in this study are a promising catalyst for hydrogen production from aqueous AB and for developing a highly efficient hydrogen storage system for fuel cell applications .
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CERAMICS INTERNATIONAL
·
2015
·Vol. 41
·期 5
·6676-6682
·
IF 2.605
Pei Peng,Ya-Ya Hu,Yong Liu,Shi Chen,Jing Shi,Rui Xiong,Yue Zhang
Magnetoelectric (ME) ceramic composites of CoFe 2 O 4 (CFO) and Pb(Zr,Ti)O 3 (PZT) with varied composition ratios were sintered using a spark plasma sintering (SPS) method. The characterization of the ceramic compositions and morphologies revealed an even distribution of the CFO and PZT phases. Physical property measurements showed that when the CFO mass percent increased from 8% to 15%, the piezoelectric constant and dielectric constant decreased monotonously, while the saturation magnetization and dielectric loss were enhanced. It was determined that a CFO mass percent of 10% or less resulted in a significant change of the polarization behaviour and a clear enhancement of the ME conversion voltage coefficient ( α E ) with an applied magnetic field . In contrast, CFO mass percentages greater than 10% had a reduced α E , and their polarization behaviour was not influenced by an applied magnetic field. With an increasing proportion of CFO in the composite, the α E first increased and then decreased. The maximum value of the α E indicated an optimal proportion of CFO (10%), which is attributed to a competition between the improved magnetostriction and deteriorating electric behaviour in the composite with the addition of CFO.
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Sustainability
·
2025
·Vol. 17
·期 21
·9886
·
IF 3.3
Chuqiao Sha,Fangkui Cheng,Shen Luo,Chao Zhou,Hong Zhang
CoFe2O4loaded onto red brick powder (CoFe2O4@RBP) was synthesized via coprecipitation followed by post-calcination and employed as a heterogeneous catalyst to activate peroxymonosulfate (PMS) for the degradation of methylene blue (MB), thereby valorizing red brick demolition waste within a circular economy pathway and aligning the study with sustainability-oriented resource recovery. The effects of pH, PMS concentration, catalyst dosage, and coexisting substances on MB removal were systematically investigated. Complete MB removal was achieved within 30 min, and the apparent rate constant for the CoFe2O4@RBP/PMS system was 0.22 min−1—slightly lower than that of CoFe2O4/PMS—while Co leaching was markedly reduced. The process performed well across a broad pH range (3.0–9.0). EPR and radical-quenching experiments indicate that SO4•−and HO• play a minor role, whereas the Co(II)–PMS complex is primarily responsible for MB degradation; accordingly, common coexisting species (SO42−, Cl−, NO3−, humic acid) exert negligible effects. The catalyst also maintained strong durability across numerous repetitions. These results highlight a cost-efficient route to PMS activation by coupling CoFe2O4with construction waste-derived supports.
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高影响因子
WATER SCIENCE AND TECHNOLOGY
·
2021
·Vol. 84
·期 12
·3616-3628
·
IF 1.915
Li Xiaoyan,Wang Hongwei,Zhang Guozhen,Zhou Tianhong,Wu Fuping
Advanced oxidation process (AOP) has attracted widespread attention because it can effectively remove antibiotics in water, but its practical engineering application is limited by the problems of the low efficiency and difficult recovery of the catalyst. In the study, nano-spinel CoFe 2 O 4 was prepared by hydrothermal method and served as the peroxymonosulfate (PMS) catalyst to degrade antibiotic amoxicillin (AMX). The reaction parameters such as CoFe 2 O 4 dosage, AMX concentration, and initial pH value were also optimized. The reaction mechanism was proposed through free radical capture experiment and possible degradation pathway analysis. In addition, the magnetic recovery performance and stability of the catalyst were evaluated. Results showed that 85.5% of AMX could be removed within 90 min at optimal conditions. Sulfate radicals and hydroxyl radicals were the active species for AMX degradation. Moreover, the catalyst showed excellent magnetism and stability in the cycle experiment, which has great potential in the AOP treatment of antibiotic polluted wastewater. Magnetic nano-CoFe 2 O 4 was fabricated by hydrothermal process. High activity of removing AMX in the CoFe 2 O 4 /PMS system. The recovery of nano-CoFe 2 O 4 was convenient due to strong magnetics. The nano-CoFe 2 O 4 exhibited good stability and reusability.
研究领域:
环境科学
·
材料化学
·
催化化学
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Nanoscale
·
2023
·Vol. 15
·期 16
·7352-7364
·
IF 6.7
Xiaojuan Bai,Wei Song,Xuan Ling,Linlong Guo,Derek Hao,Xiao Zhang
The rational design of photocatalytic nanomaterials with unique structures is critical for remediating environmental problems and thus reducing ecological risks. In this work, we employed H2 temperature-programmed reduction to modify MFe2O4 (M = Co, Cu, and Zn) photocatalysts for obtaining additional oxygen vacancies. After activation of PMS, naphthalene and phenanthrene degradation rates in the soil phase were increased by 3.24-fold and 1.39-fold, respectively, and 1.38-fold for naphthalene in the aqueous phase by H-CoFe2O4−x. The extraordinary photocatalytic activity is attributed to the oxygen vacancies on the H-CoFe2O4−x surface, which promote electron transfer and thus enhance the redox cycle from Co(III)/Fe(III) to Co(II)/Fe(II). In addition, oxygen vacancies are used as electron traps to hinder the recombination of photogenerated carriers and accelerate the generation of hydroxyl and superoxide radicals. Quenching tests showed that the addition of p-benzoquinone resulted in the greatest decrease in the degradation rate of naphthalene (inhibition of about 85.5%), demonstrating that O2˙− radicals are the main active species in the photocatalytic degradation of naphthalene. H-CoFe2O4−x showed improved degradation performance in synergy with PMS (82.0%, kapp = 0.00714 min−1) while maintaining excellent stability and reusability. Hence, this work provides a promising approach for the design of efficient photocatalysts to degrade persistent organic pollutants in soil and aqueous environments.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Rui Zhao,Yacong Hu,Wei Ding,Ke Ren,Xinyi Gou,Chun Zhao,Huaili Zheng
Phosphite [P(III)], an emerging eutrophication pollutant, has attracted limited attention in recent years. Owing to the higher solubility and resistance to biotransformation of P(III), oxidation of P(III) to phosphate [P(V)] is considered to be necessary to enhance P(III) removal. Herein, an efficient and regenerable magnetic La 2 (CO 3 ) 3 /CoFe 2 O 4 /biochar composite (LCB) was constructed through a facile one-pot hydrothermal method to treat phosphite-laden wastewater. LCB coupled with peroxymonosulfate (PMS) exhibited satisfactory P(III) removal performance through a one-step process for simultaneous oxidation and adsorption of P(III). The adsorption capacity of LCB/PMS for P(III) (71.94 mg/g) was much higher than that of LCB. LCB/PMS system showed high P(III) removal efficiency of 96.62 %, wide pH ranging from 4.0 to 9.0, and good reusability. It also worked well in the existence of anions and humic acid. The quenching experiments and electron spin resonance tests (ESR) revealed the critical role of SO 4 • - in the P(III) oxidation process. Characterization results demonstrated that electrostatic attraction and ligand exchange were responsible for P(III)/P(V) adsorption. Moreover, LCB/PMS system presented desirable performance in eliminating a series of typical organic and inorganic phosphorus. The LCB/PMS system provides a promising and sustainable technology for the purification of P(III)-contaminated water.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jinjuan Xue,Jin Li,Jiamin Gao,Mingxin Wang,Shuaishuai Ma
Effective synchronous removal of water-immiscible oils and water-miscible refractory aromatic pollutants from wastewater is of great significance for water remediation. In this work, a low-cost and easy-prepared composite membrane was fabricated by vacuum assisted assembling of CoFe 2 O 4 and tannic acid on polyvinylidene fluoride (PVDF) substrate. The CoFe 2 O 4 functionalized PVDF membrane (CoFe 2 O 4 @PVDF) exhibited in-air superamphiphilic and underwater superoleophobic surface wettability. The resultant membrane displayed relatively favorable permeation flux (811.5 to 1837.5 Lm −2 h −1 ) and high separation efficiency (above 99 %) in the separation of a series of emulsified oils ranged from nanoscale to microscale from water. Meanwhile, the as-fabricated CoFe 2 O 4 @PVDF membrane coupled with peroxymonosulfate (PMS) exhibited an extensive oxidizing capacity and high degradation efficiency towards aromatic contaminants with desired mineralization ability. More importantly, considering that the fabricated CoFe 2 O 4 @PVDF membrane possessed special super-wettability as well as PMS activation-based catalytic ability, it also applied in the treatment of simulated complex wastewater. The process achieved effectively synchronous oil/water separation and PMS activation toward pollutants degradation. Besides, in five cyclic continuous “degradation-separation” tests, the recovered CoFe 2 O 4 @PVDF membrane after PMS-based degradation in each cycle could separate oil/water emulsions as usual. It exhibited almost complete oil rejection and flux recovery property under multicycle filtration, demonstrating its excellent durability and stability. This flexible integration of PMS-based AOP catalytic capability and super-wettability into a composite membrane can provide inspiration for effective complicated wastewater rehabilitation.
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JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Qianyu Zhang,Xiaoqin Sun,Yuan Dang,Jun-Jie Zhu,Yuan Zhao,Xiaoxiang Xu,Yuanzhen Zhou
A novel electrochemically enhanced homogeneous-heterogeneous catalytic system was constructed by placing the prepared heterogeneous catalyst (CoFe 2 O 4 /NF) in parallel between the anode and the cathode for peroxymonosulfate (PMS) activation to remove levofloxacin (LVF) in this work. Over 90% of LVF could be effectively removed by the constructed system after 40 min's degradation. And the electrical energy consumption was only 2.51 kWh/m 3 , which was lower than 54.5% of the traditional electrochemical advanced oxidation process . Besides, the system broadened the response range of pH and overcame the inhibitory effect of alkaline conditions on degradation. These activities were mainly due to the high generation ability of free radical (SO 4 ·- , ·OH and O 2 ·- ) and non-radical ( 1 O 2 ). And the SO 4 ·- was found to be the main radical for LVF degradation. The high SO 4 ·- generation ability was demonstrated to be resulted from the dual effects of synergy of CoFe 2 O 4 /PMS and enhancement of electrochemistry in EC/CoFe 2 O 4 /PMS system. In detail, electrochemistry could effectively promote the continuous circulation of Co 2+ /Co 3+ and Fe 2+ /Fe 3+ redox cycles on the surface of CoFe 2 O 4 to enhance the activation of PMS , thereby generating SO 4 ·- . This work can provide a promising and cost-effective approach to construct highly efficient organic pollutant degradation system.
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PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2020
·
IF 16.683
Jingwen Wang,Bin Xiong,Lei Miao,Songlin Wang,Pengchao Xie,Zongping Wang,Jun Ma
In this study, peracetic acid (PAA) is successfully activated by cobalt ferrite (CoFe 2 O 4 /PAA) to remove sulfamethoxazole (SMX). Increasing either PAA (25–200 μM) or CoFe 2 O 4 (25–200 mg/L) dose accelerated SMX degradation in the CoFe 2 O 4 /PAA system, and the best removal of SMX (87.3%) was acquired with 200 μM PAA and 0.1 g/L CoFe 2 O 4 at neutral condition. Addition of humic acid or HCO 3 – inhibited SMX removal, whereas Cl – had little impact. The redox cycle of ≡Co 3+ /≡Co 2+ on the CoFe 2 O 4 surface dominated PAA activation to produce organic radicals (R-O • ) including CH 3 C(O)O • and CH 3 C(O)OO • accounting for SMX degradation. Based on the density functional theory (DFT) calculation and identified oxidation products, SMX transformation pathway was proposed to be initiated by electron transfer reaction with R-O • . The insignificant variation of acute toxicity, the fine CoFe 2 O 4 stability and the good removal of some other micro-organic pollutants suggested the potential applicability of the CoFe 2 O 4 /PAA system in degrading micro-organic pollutants.
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CHEMOSPHERE
·
2021
·
IF 7.086
Liu-Xi Yang,Jia-Cheng E. Yang,Ming-Lai Fu
In this study, porous magnetic CoFe 2 O 4 nanocrystals (NCs) were successfully synthesized by using bimetal-organic framework (MOF) as a precursor, and used as catalysts to activate peroxymonosulfate (PMS) for the removal of chloramphenicol (CAP) in the solution. The structure and physicochemical properties of CoFe 2 O 4 NCs were thoroughly examined by a series of characterization techniques. The results revealed as-synthesized CoFe 2 O 4 had a nanorod-shaped structure with high specific surface area (83.00 m 2 g −1 ) and pore volume (0.31 cm 3 g −1 ). Furthermore, the degradation efficiency (100%) and the removal of total organic carbon (68.09%) were achieved after 120 min with 0.1 g/L CoFe 2 O 4 NCs, 2 mM PMS and 10 mg/L CAP at pH of 8.20. In addition, effects of catalyst dosage, PMS dosage, initial pH values, CAP concentration and co-existing anions as well as natural organic matters in the solution on the degradation efficiencies were studied and all the removal can be well fitted with pseudo-first-order kinetic model (R 2 > 0.96). Sulfate radicals (SO 4 •− ) and hydroxyl radicals (HO•) were proved to be two main reactive species for CAP removal in CoFe 2 O 4 /PMS system based on quenching experiments. CAP was degraded by the main pathways of dichlorination, denitration, decarboxylation , hydroxylation, ring cleavage and chain cleavage on CoFe 2 O 4 /PMS system through high performance liquid chromatograph-mass spectrometry analysis. We believe that this study would be very meaningful to promote the applications of MOFs-derived catalysts on the SO 4 •− based advanced oxidation processes (SR-AOPs) for the environmental remediation.
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PubMed
高影响因子
INTEGRATED FERROELECTRICS
·
2020
·
IF 0.557
Zhennan Liu,Chunsheng Shi,Fang He,Naiqin Zhao
A novel electromagnetic wave absorber of three-dimensional carbon networks decorated with CoFe2O4 nanoparticles (3DC/CoFe2O4) was prepared through a simple freeze-drying method followed by a high-temperature calcination process. The 3DC/CoFe2O4 composite prepared at 630 °C (S630) exhibits broadband electromagnetic wave absorption with only 20 wt% filler loading. The effective absorption bandwidth (reflection loss [RL] < −10 dB) of S630 reaches up 6.63 GHz, and the minimum RL of −19.5 dB is obtained at 15.45 GHz when the matching thickness is 2.5 mm. The excellent electromagnetic wave absorption performance of the 3DC/CoFe2O4 composite can be attributed to good impedance matching and strong attenuation capacity.
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