Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Ying Liu,Rentao Xu,Xiaolong Gong,Cheng Yao,Shunlong Pan
The increased discharge of organoarsenic to natural waters, brings significant risks to ecosystems and human health. It is curial to rapidly transform organoarsenic to harmless arsenate (As(V)) before conventional coagulation-sedimentation treatment. In this study, the roxarsone (ROX) was destroyed to form As(V) with almost 100 % transformation rate and reaction rate of 0.43 min −1 via the CoFe 2 O 4 /peracetic acid (PAA) system. Specifically, PAA was primarily activated to form singlet oxygen ( 1 O 2 ) and organic radicals (R-O·) by Co(II)/Co(III) redox cycle existed on the CoFe 2 O 4 surface, the presence of iron (Fe) in the CoFe 2 O 4 facilitated the transformation of Co(III) to Co(II), and then that reactive oxygen species (ROS) was employed to mineralize ROX. The presence of common anions, and natural organic matters (NOM) hardly inhibit the degradation of ROX. Furthermore, the catalytic efficiency of CoFe 2 O 4 /PAA system remained above 94 % after five cycles. These findings suggest that the CoFe 2 O 4 /PAA system is a promising technique for enhanced arsenic decontamination.
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高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Yuqi Cao,Yingpei Liu,Chenchen Ding,Tingting Ma,Huimin Ye,Weiwei Zhong,Wei He
In this study, four cobalt ferrite@carbon nitride (CoFe 2 O 4 @g-C 3 N 4 ) composites were prepared by co-precipitation method to achieve chemo-photodynamic synergistic cancer therapy. The effect of the morphology of g-C 3 N 4 on the chemotherapy and photodynamic therapy of CoFe 2 O 4 @g-C 3 N 4 (CFO@g-C 3 N 4 ) was investigated in detail. CFO@PMCN with porous structures and CFO@CNT with a reticulated structure displayed high loading efficiencies of doxorubicin (DOX), exhibiting a pH-responsive release property and facilitating the delivery of DOX into cancer cells for chemotherapy. CFO@CNT possessed a higher photothermal performance for photothermal agents in cancer treatment compared with other CoFe 2 O 4 @g-C 3 N 4 composites. In addition, more reactive oxygen species (ROS) was generated in the assistance of CFO@CNT under the irradiation condition for photodynamic therapy (PDT) treatment. Based on the synergistic effect of chemotherapy and photodynamic therapy, the obtained CFO@CNT-DOX exhibited an excellent therapeutic effect and significant pH-responsive release characteristics confirmed by dimethylthiazol diphenyltetrazolium bromide (MTT) assay and dual staining fluorescence imaging analysis.
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Electrocatalysis
·
2024
·Vol. 15
·期 4
·344-352
·
IF 2.7
Zhang Xihuan,Jaouhari Abdelhadi El,Li Chunyue,Adnane Maimoune,Liu Wanying,Mellalou Abderrahman,Ghamouss Fouad,Lin Yuanhua
The oxygen evolution reaction (OER) holds pivotal importance in sustainable energy conversion, as it forms the critical half-reaction in various electrochemical processes, including water splitting for hydrogen production and rechargeable metal-air batteries. Here, a CoFe 2 O 4 @Co 3 O 4 nano-composite was synthesized using a facile hydrothermal process and deposited onto the surface of nickel foam through electrophoresis. Characterization using XRD, Raman spectroscopy, and XPS confirmed the successful synthesis of the composite, exhibiting characteristic peaks of both Co 3 O 4 and CoFe 2 O 4 . The nano-composite exhibited a more amorphous phase than pure oxides, benefiting electrocatalytic activity. Scanning and transmission electron microscopy highlighted the composite’s morphological characteristics, showcasing a Co 3 O 4 island distribution on the CoFe 2 O 4 surface. Electrochemical evaluations revealed the superior oxygen evolution reaction (OER) performance of CoFe 2 O 4 @Co 3 O 4 , with low overpotentials, faster kinetics, and enhanced stability compared to pure oxides and the benchmark RuO 2 catalyst. A comprehensive analysis was carried out to investigate the dynamic behavior during electrocatalytic oxygen evolution reaction. This study unveils the intricate charge and electron transfer mechanisms between cobalt and iron atoms, providing insights into their collaborative role throughout the OER process. Graphical Abstract
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高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
M.O. Abdel-Salam,Youngsoo Kim,Yasser M. Moustafa,Taeho Yoon
Green hydrogen is a crucial element in the hydrogen value chain, encompassing hydrogen production, transportation, storage, and application. The production of green hydrogen via NaBH 4 hydrolysis (SBH) entails a high cost. However, the fast kinetics of this process with a catalyst compensate for the substantial cost, especially in specific applications, such as local or intermittent use. Silver is known for its excellent catalytic properties. Its high catalytic activity is a key factor in achieving efficient hydrogen generation from (SBH). In this study, a nanocomposite catalyst composed of silver nanoparticles (AgNPs), CoFe 2 O 4 , and carbon nanotubes (CNT) was investigated to demonstrate an effective catalyst design approach to achieve enhanced hydrogen generation performance. The H 2 production rate in the presence of Ag-based/CoFe 2 O 4 –CNT was 320 mL min −1 g −1 , and the apparent activation energy was 14.7 kJ mol −1 , superior to that of Ag-based catalysts reported in the literature. Analyses of the observed outcomes revealed that the CNT was decorated with well-dispersed AgNPs and CoFe 2 O 4 nanoparticles. The synergistic effects of AgNPs, CoFe 2 O 4 , and CNT were demonstrated by analyzing the kinetic behaviour of each component based on systematic comparisons. Furthermore, the paramagnetic property of CoFe 2 O 4 enables harvesting of the catalyst using an external magnetic field, and it was verified that the reactivity of the collected catalyst was maintained throughout seven successive cycles. The outstanding catalytic performance of Ag/CoFe 2 O 4 – CNT should be attributed to the uniform dispersion of nanoparticles on the CNT surface. Furthermore, our key approach for developing efficient Ag-based carbon advanced catalysts for SBH in the future is to ensure their suitability for industrial applications.
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ChemistrySelect
·
2025
·Vol. 10
·期 6
·e202405300
·
IF 2
Chuanda Ruan,Limeng Zhang,Ziyan Song,Xiaodan Zheng,Lifeng Han,Zhifei Fu,Qinwei Guo,Meng Wang,Fei Tian
Graphical This study focuses on the preparation of a magnetic catalyst with a composite structure, achieved through a series of pretreatments and calcination using bimetallic ions in a nitrogen atmosphere. The findings indicate that the magnetic catalyst not only exhibits remarkable reusability but also effectively degrades levofloxacin via multiple mechanisms. Antibiotics, Biomass, Heterogeneous catalysis. To mitigate pollution caused by levofloxacin (LVF) in aquatic environments, a magnetic catalyst, CoFe 2 O 4 /CoFe@BC (CF@BC), was synthesized using loofah-derived biochar (BC) as a support, through coprecipitation followed by calcination at high temperatures. CF@BC was utilized for the degradation of LVF in aqueous solutions containing peroxymonosulfate (PMS), requiring no additional energy input. CF@BC demonstrates exceptional catalytic performance, even under acidic conditions, achieving a degradation rate of 98% within 4 min. Compared to pure CoFe 2 O 4 nanoparticles (CF), CF@BC exhibits smaller particle sizes and improved dispersion properties, enhancing the exposure of reactive sites. The degradability of the CF@BC/PMS system is nearly three times greater than that of the CF/PMS system under identical conditions. Furthermore, the CF@BC/PMS system demonstrated effective degradation of LVF across a wide initial pH range (3 to 9) and maintained high degradation efficiency after three cycles. Both Co(II)/Co(III) and Fe(III)/Fe(II) are involved in the activation process of PMS, with SO₄ •− and 1 O₂ being the predominant species contributing to degradation. Additionally, two pathways for the degradation of LVF have been proposed. The CF@BC/PMS system developed in this study can be effectively applied to remediate water contaminated by LVF.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhenze Xie,Yucheng Huang,Jingguang Wang,Wenxin Guo,Yutao Lin,Yingxin Lin,Chang Du
Breast cancer is one of the most widespread cancers worldwide in the female population. However, the side effects and toxicity of chemotherapy and radiotherapy are the obstacles to the treatment of breast cancer. Therefore, we developed a Pt loaded CoFe 2 O 4 -based nanoparticles (CF@Pt) for breast cancer treatment with chemodynamic therapy (CDT) and sonodynamic therapy (SDT). The Co 2+ /Co 3+ and Fe 2+ /Fe 3+ gave CF@Pt peroxidase-like activity and catalase activity to gain ·OH and O 2 in the tumor microenvironment (TME) for CDT. Furthermore, the separation of electron-hole pairs of CF@Pt transferred the O 2 into 1 O 2 in the presence of ultrasound (US) for SDT. The high level of O 2 generated by CDT would produce more 1 O 2 by SDT that promoted the CDT efficiency. Moreover, the addition of Pt limited the recombination of electron-hole pairs and reduced the energy gap to enhance SDT/CDT combination therapy. In addition, CF@Pt could be engulfed by MDA-MB-231 cells and induced the apoptosis while it had good biocompatibility and blood compatibility. This design provided a novel application on the treatment of breast cancer.
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MOLECULES
·
2024
·Vol. 29
·期 19
·4561
·
IF 4.2
Suiying Dong,Jiafu Dai,Ying Yang,Amir Zada,Kezhen Qi
The large-scale utilization of antibiotics has opened a separate chapter of pollution with the generation of reactive drug-resistant bacteria. To deal with this, in this work, different mass ratios of CoFe 2 O 4 /WO 3 nanocomposites were prepared following an in situ growth method using the precursors of WO 3 and CoFe 2 O 4 . The structure, morphology, and optical properties of the nanocomposite photocatalysts were scrutinized by X-ray diffraction (XRD), UV-visible diffuse reflectance spectra (UV-Vis DRS), photoluminescence spectrum (PL), etc. The experimental data signified that the loading of CoFe 2 O 4 obviously changed the optical properties of WO 3 . The photocatalytic performance of CoFe 2 O 4 /WO 3 composites was investigated by considering tetracycline as a potential pollutant. The outcome of the analyzed data exposed that the CoFe 2 O 4 /WO 3 composite with a mass ratio of 5% had the best degradation performance for tetracycline eradication under the solar light, and a degradation efficiency of 77% was achieved in 20 min. The monitored degradation efficiency of the optimized photocatalyst was 45% higher compared with the degradation efficiency of 32% for pure WO 3 . Capturing experiments and tests revealed that hydroxyl radical (·OH) and hole (h + ) were the primary eradicators of the target pollutant. This study demonstrates that a proper mass of CoFe 2 O 4 can significantly push WO 3 for enhanced eradication of waterborne pollutants.
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PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Biming Liu,Wenbin Song,Haixia Wu,Yanhua Xu,Yongjun Sun,Yang Yu,Huaili Zheng,Shipeng Wan
In this study, oily sludge (OS) was pyrolyzed into an environmentally friendly OS carbon (OSC) material, which was used as the carrier of CoFe 2 O 4 nanoparticles to prepare a heterogeneous catalyst CoFe 2 O 4 /OSC, and it was used to catalyze the degradation of norfloxacin (NFC) by peroxymonosulfate (PMS). X-ray diffraction (XRD) and transmission electron microscope (TEM) characterization results show that CoFe 2 O 4 /OSC had a spinel structure under high temperature pyrolysis conditions. The effects of initial pH, PMS dosage, catalyst dosage, and temperature on NFC degradation efficiency were also studied. Under a temperature of 25 °C, an initial pH of 7, a catalyst amount of 0.5 g/L, and a PMS dosage of 0.8 mM, the reaction rate constant reached 0.051 min −1 , and the degradation efficiency and total organic carbon of NFC reached 90.8% and 62%, respectively, within 60 min. Trace amounts of Co and Fe ions were leached from the system (both less than 30 μg/L). After ten cycles, the degradation efficiency of NFC decreased to 69.8%. Radical quenching experiments, electron paramagnetic resonance, and X-ray fluorescence spectroscopy characterization proved that free-radical ( OH, SO 4 − , and O 2 − ) and nonradical ( 1 O 2 ) active species were present in the system. Moreover, the CoFe 2 O 4 /OSC/PMS system involved the participation of two pairs of redox couples (Fe(II)/Fe(III) and Co(III)/Co(II)). Results from matrix-assisted laser desorption ionization time-of-flight mass spectrometry and ion chromatography proved that the main oxidation pathways of NFC were formed through the fragmentation of heterocycles, defluorination of benzene rings, decarboxylation reactions, and piperazine ring-opening process. At the same time, NFC was eventually oxidized to fluoride. This study provides potential for the resource utilization of OS and the application of sludge-type catalysts in PMS-activated oxidation systems.
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APPLIED SURFACE SCIENCE
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2020
·
IF 6.182
Peidong Hong,Yulian Li,Junyong He,Abdul Saeed,Kaisheng Zhang,Chengming Wang,Lingtao Kong,Jinhuai Liu
Heterogeneous Fenton technology is considered to be an effective method to solve the issues of antibiotic pollutants. In this study, a highly active surface exposed CoFe 2 O 4 catalyst was fabricated to activate hydrogen peroxide (H 2 O 2 ) to degrade aqueous doxycycline (DC). Batch experiments investigated the influence of different factors such as CoFe 2 O 4 dosage, H 2 O 2 dosage, contaminant concentration and pH on DC elimination. Remarkably, the results showed that 1.2 g/L CoFe 2 O 4 with 10 mM H 2 O 2 could quickly remove 92% DC of 20 ppm under neutral pH conditions in 10 min, and after 5 cycles, the removal of DC still remained above 85%. DMPO-X signals captured by EPR illustrated abundant hydroxyl radicals ( OH) were produced in the surface CoFe 2 O 4 /H 2 O 2 system swiftly and that was the dominant active oxygen species in the degradation of DC. The valence changes of Co 3+ /Co 2+ and Fe 3+ /Fe 2+ appeared on the surface of CoFe 2 O 4 provided many electrons to participate in the process of activating H 2 O 2 . Density functional theory (DFT) calculation was conducted to reveal preferable sites of different atoms on DC for radicals attacking. Combined with LC-MS analysis, two possible degradation pathways were proposed.
研究领域:
环境科学
·
化学工程
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
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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高影响因子
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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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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