RSC Advances
·
2016
·Vol. 6
·期 40
·33636-33642
·
IF 3.289
Zezhou Yang,Zhen Zhang,Yanzhou Jiang,Maoqiang Chi,Guangdi Nie,Xiaofeng Lu,Ce Wang
Herein, we report a simple procedure to decorate small palladium nanoparticles (Pd NPs) on the surface of CoFe2O4 nanotubes; the decorated nanotubes possess intrinsic peroxidase-like activity for the sensitive detection of H2O2. The CoFe2O4 nanotubes are prepared via an electrospinning technique, followed by a calcination process in air. The functionalization of Pd NPs on the surface of CoFe2O4 nanotubes was achieved through an in situ reduction process using ascorbic acid (AA) as a reducing agent. The synthesized Pd nanoparticles, which are small in size, are evenly dispersed on the surface of the CoFe2O4 nanotubes. The hollow structure of the CoFe2O4 nanotubes and the uniform distribution of the Pd nanoparticles enhance peroxidase-like activity toward the catalytic oxidation of the peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H2O2. The peroxidase-like property of the Pd/CoFe2O4 composite nanotubes provides a facile approach for the colorimetric detection of H2O2 with a low detection limit. This work provides great potential for Pd/CoFe2O4 nanotubes as enzyme-like nanocatalysts to sensitively detect H2O2 in biological systems.
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RSC Advances
·
2015
·Vol. 5
·期 14
·10632-10640
·
IF 3.84
Ke Zhang,Wei Zuo,Zhiyi Wang,Jian Liu,Tianrong Li,Baodui Wang,Zhengyin Yang
Recent studies have suggested that the physical and chemical properties of nanoparticles (NPs) strongly depend on local chemical composition, size, and shape. Here, we report a new precursor-mediated growth of monodisperse magnetic cobalt ferrite (CoFe2O4) NPs with controlled size and shape. CoFe2O4 NPs with near corner-grown cubic, near cubic and polyhedron shape can be successfully prepared by simply tuning the amount of iron and cobalt acetylacetonates in oleic acid. Interestingly, the product shape varies from near corner-grown cubic to starlike by only changing the reaction temperature from 320 °C to 330 °C. These CoFe2O4 NPs exhibit size and shape-dependent peroxidase-like activity towards 3,3′,5,5′-tetramethylbenzdine (TMB) in the presence of H2O2, and thus exhibited different levels of peroxidase-like activities, in the order of spherical > near corner-grown cubic > starlike > near cubic > polyhedron; this order was closely related to their particle size and crystal morphology. CoFe2O4NPs exhibited high stability in HAc–NaAc buffer (pH = 4.0) and high activity over a broad pH (2.5–6.0). Furthermore, the Michaelis constants Km value for the CoFe2O4 NPs (0.006 mM) with TMB as the substrate was lower than HRP (0.062 mM) and Fe3O4 NPs (0.010 mM). After further surface functionalization with folic acid (FA), the folate-conjugated CoFe2O4 nanoparticles allow discrimination of HeLa cells (folate receptor overexpression) from NIH-3T3 cells (without folate receptor expression). Such investigation is of great significance for peroxidase nanomimetics with enhanced activity and utilization.
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LANGMUIR
·
2025
·
IF 3.9
Wantao Li,Yunlan Xu,Dengjie Zhong,Danli Tang,Tanxia Xiang,Chunmiao Fan,Yuanfang Yang
In this study, CoFe2O4 anchored by MoS2 modified biochar (CoFe2O4@MoS2–BC) was synthesized using a hydrothermal approach and utilized to activate peroxymonosulfate (PMS) to degrade rhodamine B (RhB). The effects of pH value, catalyst and PMS dosage, RhB concentration, and coexisting compounds were systematically investigated. Within 7 min, CoFe2O4@MoS2–BC achieved a removal rate of 99.63% for 100 mg·L–1 RhB. The outstanding stability and environmental compatibility of CoFe2O4@MoS2–BC was verified by cycling and metal ion leaching experiments. The contribution of 1O2, SO4•–, •OH, and •O2– in the degradation procedure was revealed by quenching experiments, among which 1O2 was the predominant active species. Electrochemical characterization indicated that CoFe2O4@MoS2–BC exhibited enhanced current density, redox activity, and superior electron transfer capability. Comprehensive characterization analysis and experimental data revealed that the high efficiency of CoFe2O4@MoS2–BC was attributed to Co2+/Co3+, Fe2+/Fe3+, and Mo4+/Mo6+ redox cycling on the CoFe2O4@MoS2–BC surface. The cycles of Co2+/Co3+ and Fe2+/Fe3+ were enhanced by Mo, while unsaturated S increased the reactivity of Mo, thereby accelerating the redox of metal ions; oxygen vacancies (Ov) enhance the mobility of surrounding oxygen ions mobility and promoted the conversion from lattice oxygen (Olat) to reactive oxygen species (O*), thereby activating PMS effectively. This research is expected to provide innovative insights that will inform the design and development of excellent activity and stability of heterogeneous metal-based catalysts.
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高影响因子
Environmental Science-Water Research & Technology
·
2024
·
IF 3.5
Wei Wei,Shiqian Gao,Feiyue Qian,Chongjun Chen,Youyi Wu
Reduced graphene oxide modified CoFe2O4 (CoFe2O4/rGO) magnetic nanoparticles (MNPs) were synthesized by employing an in situ crystallization microwave irradiation method. The morphology and textural properties of CoFe2O4/rGO were characterized using SEM, TEM, BET/BJH and XPS. GO was reduced to rGO via the thermal catalysis of Co(acac)2, which contributed to expanding the effective microwave absorption bandwidth of carbon-based materials. The lattice stability of CoFe2O4 effectively improved Snoek's limit and protected the catalytic active site distribution of CoFe2O4/rGO nanoparticles. The CoFe2O4/rGO composites were selected as a heterogeneous catalyst to initiate the activation of peroxymonosulfate (PMS) for the generation of reactive oxygen species (ROS) and degrade 2-aminobenzothiazole (ABT) in a water sample. Under optimal conditions, the coupling of CoFe2O4/rGO and PMS can completely degrade ABT in aqueous solutions within 90 minutes. The effect of inorganic anions, metal cations and humic acid (HA) on the degradation efficiency of ABT was explored. Experimental results showed that the presence of HA and low concentrations of Cu2+ enhanced the process performance remarkably, while the addition of NO3−, SO42−, Zn2+, Cd2+ and high concentrations of Cu2+ suppressed the degradation of ABT. Meanwhile, the absence of Cl− and HCO3− presented no significant influence on the degradation. Radical quenching experiments indicated that SO4−·, ·OH and non-free radicals of 1O2 were involved in the CoFe2O4/rGO-PMS system, with the former two being the dominating radical species. A degradation efficiency of 100% was obtained when the proposed method was applied to the degradation of ABT in actual water samples. The CoFe2O4/rGO catalyst-activated PMS processes offered a reference to eliminate refractory organics in water.
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Journal of Environmental Chemical Engineering
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2024
·
IF 7.4
Chun Wang,Bai-Hang Zhao,Bao-Yu Zhang
A multiphase catalyst (CoFe 2 O 4 @2D-V) was constructed by loading CoFe 2 O 4 on two-dimensional vermiculite surface via hydrothermal synthesis. Levofloxacin (LVX), as a typical antibiotic, was used to estimate the performance of CoFe 2 O 4 @2D-V by PMS activation. CoFe 2 O 4 @2D-V exhibited an excellent adsorption and degradation performance for LVX. Experimental results showed an 88.6 % of LVX removal efficiency and 0.048 min −1 of LVX removal rate obtained in CoFe 2 O 4 @2D-V/PMS system under the conditions of a 15 % CoFe 2 O 4 mass ratio (15 %-CoFe 2 O 4 @2D-V), initial pH 6.89, [LVX] 0 10 mg/L, [Catalyst] 0 0.3 g/L, and [PMS] 0 0.35 mM. Adsorption removal accounted for 35.1 % of LVX removal. The prominent roles of LVX degradation were radical way mainly contributed by •SO 4 - and non-radical way achieved by 1 O 2 . The redox cycle between Co(III)/Co(II) and Fe(III)/Fe(II) played a crucial role in activating PMS to generate reactive oxygen species (ROS). In addition, 15 %-CoFe 2 O 4 @2D-V had less ion leakage, high reusability, and excellent adaptability. Four degradation pathways of LVX in 15 %-CoFe 2 O 4 @2D-V/PMS system were proposed. ECOSAR evaluation show that LVX and its degradation intermediates pose minimal harm to the ecosystem. 15 %-CoFe 2 O 4 @2D-V is an environmentally friendly and efficient catalyst for LVX removal by PMS activation, which may provide a new idea for developing loaded catalysts for antibiotics removal through adsorption and catalysis.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Kun Xu,Zhijia Zhu,Chunyan Hu,Jian Zheng,Huitao Peng,Baojiang Liu
There is currently plenty of emphasis on measures to handle the water pollution spurred on by the misuse of antibiotics. Given its exceptional degradation accomplishment, periodate (PI), a steady solid oxidant, has promising future applications in the breakdown of antibiotics. In this research, PI was activated with UV/CoFe 2 O 4 (CFO) for the first time in an attempt to eliminate oxytetracycline (OTC). The UV/CFO/PI system eliminated 30 mg∙L -1 OTC with a removal effectiveness of almost 100 % in 12 min (OTC 30 mg∙L -1 , CFO 0.2 g∙L -1 , PI 2 mM, pH 5.5). In addition, the ferromagnetism of the CFO assisted to the system's remarkable cycling achievement, with 85.9 % of the OTC still removed after ten cycles. Various organic contaminants, which include reactive blue KN-R (KN-R), ciprofloxacin (CIP), chlortetracycline (CTC), and levofloxacin (LVX), further demonstrated the UV/CFO/PI system to be useful for degrading. The primary active substances for OTC elimination were revealed and recognized through scavenging experiments and EPR analysis as h + , •IO 4 , •IO 3 , 1 O 2 , •OH, and •O 2 – . Simultaneously, redox cycles of Fe(III)/Fe(II) and Co(III)/Co(II) were also observed by XPS test to hasten OTC deterioration. It appeared that this system may be a green approach for antibiotic elimination by investigating the degradation route of OTC and the influence it has on the surroundings employing FuKui functions, LC-MS, and toxicological analysis software (T.E.S.T.), respectively. Additionally, we observed that the CFO (2 2 2) crystal surface has the best adsorption impact on PI by computing Eads from DFT.
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JOURNAL OF MATERIALS SCIENCE
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2025
·
IF 3.9
Lu Yao,Tian Yu,Hong Bo,Xu Jingcai,Peng Xiaoling,Li Jing,Chen Hongwei,Qiu Shi,Zhang Nan,Wang Xinqing
Interface polarization and conduction loss constitutes a crucial loss mechanism in electromagnetic wave absorption (EWA) materials, the dissipation capacity could be enhanced by regulating the electrical conductivity and heterogeneous interfaces of EWA composites. In this work, the hollow CoFe 2 O 4 microspheres are fabricated using the hydrothermal method and are subsequently compounded with polyaniline (PANI) through mechanical mixing to synthesize hollow CoFe 2 O 4 @PANI (H-CFP) composites. By adjusting the PANI content and thereby altering the interfaces of CoFe 2 O 4 and PANI, the impact on the microstructures and EWA performance is systematically analyzed for the H-CFP composites. All results indicate that the CoFe 2 O 4 microspheres are well-dispersed on PANI and greatly affect the EWA performance of the H-CFP composites. The optimized H-CFP-4 displays the outstanding EWA capacity with a minimum reflection loss (RL min ) of − 43.60 dB and an effective absorption bandwidth (EAB) of 1.71 GHz at 5.5 mm. Additionally, the superior performance of the H-CFP composites in the domain of radar stealth is further verified through CST simulation. The excellent EWA behavior is attributed to the interface polarization, conduction loss and impedance matching due to the synergistic effect of conductive PANI and magnetic CoFe 2 O 4 microspheres. This study offers a novel concept for designing high-performance EWA materials suitable for complex electromagnetic environments and possesses broad application prospects.
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Journal of Water Process Engineering
·
2025
·
IF 6.7
Liping Qiu,Fanduo Meng,Qi Qiu,Xinwei Kang,Shuai Gong,Fengxia Zhang,Jingtao Xu,Feihong Wang,Daoji Wu,Xuewu Zhu
Membrane fouling represents a substantial barrier to the progress of ultrafiltration membranes. The catalytic membrane integrates ultrafiltration with advanced oxidation processes; this provides an efficient solution to mitigate membrane fouling. In this study, CoFe 2 O 4 nanoparticles were integrated into polyvinylidene fluoride (PVDF) to develop a novel composite ultrafiltration membrane (PVDF@CoFe 2 O 4 ). The chemical composition, surface morphology, filtration performance, and catalytic ability of the synthesized PVDF@CoFe 2 O 4 membranes were systematically assessed. The hydrophilicity of the PVDF@CoFe 2 O 4 membrane was enhanced, and its water flux increased by up to 1.4 times using CoFe 2 O 4 doping. The PVDF@CoFe 2 O 4 membrane demonstrated the lowest degree of irreversible fouling and superior stability. In the presence of peroxomonosulfate (PMS), the 2.5 wt% PVDF@CoFe 2 O 4 membrane achieved a norfloxacin (NOR) removal efficiency of 82.5 % within 120 min; this value significantly exceeded the 17.82 % efficiency recorded for the pristine PVDF membrane. The synergistic effect of SO₄ •- and •OH led to the conversion of natural organic matter (NOM) into smaller molecules following oxidation, thereby enhancing the antifouling performance of the membrane. These findings provide a promising approach for mitigating NOM-induced membrane fouling in natural surface water.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yixin Peng,Luwen Qian,Xianbo Sun,Long D. Nghiem,Fei Pan,Jing Ji,Yongdi Liu,Zhengqing Cai
This study introduces Cu into the CoFe 2 O 4 structure via a one-step hydrothermal method, creating a polymetallic (Cu/CoFe 2 O 4 ) catalyst with synergistic dual reaction centers. Material characterization reveals that Cu incorporation facilitates the formation and maintenance of low-valent Cu + and Fe 2+ species. Synergistic Cu + /Cu 2+ and Co 2+ /Co 3+ redox couples efficiently shuttle electrons, facilitating the rapid reduction of Fe 3+ (the rate-limiting step) and boosting H 2 O 2 activation efficiency across a wide pH range. The optimized Fenton system achieved complete ofloxacin (OFX) removal within 120 min and high mineralization under neutral conditions (pH 7), exhibiting a reaction rate 19 times higher than pristine CoFe 2 O 4 . The surface-bound •OH was identified as the primary reactive species (56 % contribution) and O 2 •− as secondary contributors. During the reaction, the •OH concentration reached 411 μM within the initial 5 min followed by slower accumulation, with the secondary reaction rate constant between •OH and OFX to be 1.55 × 10 10 M −1 ·s −1 . The O 2 •− generation rate was 1.81 × 10 −8 M·s −1 , and the secondary reaction rate constant between O 2 •− and OFX was 1.08 × 10 7 M −1 ·s −1 . The dominance of surface-bound •OH provides intrinsic tolerance to bulk solution pH fluctuations, explaining the system's high efficiency at neutrality. The material maintained over 95 % efficiency in continuous-flow pilot operation over 75 h, demonstrating exceptional potential for industrial implementation. Toxicity assessment via seed germination and theoretical calculation indicated reduced ecotoxicity of treated effluent. These findings highlight the material's broad pH adaptability, practical efficacy in complex water matrices, and potential for antibiotic wastewater remediation.
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ENVIRONMENTAL TOXICOLOGY
·
2015
·Vol. 31
·期 12
·2068-2080
·
IF 3.197
Farooq Ahmad,Xiaoyi Liu,Ying Zhou,Hongzhou Yao,Fangfang Zhao,Zhaoxing Ling,Chao Xu
Fascinating super paramagnetic uniqueness of iron oxide particles at nano-scale level make them extremely useful in the state of the art therapies, equipments, and techniques. Cobalt ferrite (CoFe 2 O 4 ) magnetic nanoparticles (MNPs) are extensively used in nano-based medicine and electronics, results in extensive discharge and accumulation into the environment. However, very limited information is available for their endocrine disrupting potential in aquatic organisms. In this study, the thyroid endocrine disrupting ability of CoFe 2 O 4 NPs in Zebrafish larvae for 168-h post fertilization ( hpf ) was evaluated. The results showed the elevated amounts of T4 and T3 hormones by malformation of hypothalamus pituitary axis in zebrafish larvae. These elevated levels of whole body THs leads to delayed hatching, head and eye malformation, arrested development, and alterations in metabolism. The influence of THs disruption on ROS production and change in activities of catalase (CAT), mu -glutathione s-transferase ( mu -GST), and acid phosphatase (AP) were also studied. The production of significantly higher amounts of in vivo generation of ROS leads to membrane damage and oxidative stress. Presences of NPs and NPs agglomerates/aggregates were also the contributing factors in mechanical damaging the membranes and physiological structure of thyroid axis. The increased activities of CAT, mu -GST, and AP confirmed the increased oxidative stress, possible DNA, and metabolic alterations, respectively. The excessive production of in vivo ROS leads to severe apoptosis in head, eye, and heart region confirming that malformation leads to malfunctioning of hypothalamus pituitary axis. ROS-induced oxidative DNA damage by formation of 8-OHdG DNA adducts elaborates the genotoxicity potential of CoFe 2 O 4 NPs. This study will help us to better understand the risk and assessment of endocrine disrupting potential of nanoparticles. © 2015 Wiley Periodicals, Inc. Environ Toxicol 31: 2068–2080, 2016.
研究领域:
环境毒理学
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纳米技术
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水生生物学
·
内分泌学
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 93
·期 2
·419-427
·
IF 1.986
Niu Ping,Li Chunhui,Jia Chunxiao,Wang Dunqing,Liu Shuwu
Fibrous cobalt ferrite catalyst was synthesized using the sol–gel method combined with celloulose template. This technology can exactly reproduce the microstructure of cellulose template on nanometer level. The obtained cobalt ferrite was characterized by field emission scanning electron microscope (FESEM), x-ray diffractometry (XRD), fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer. Cobalt ferrite exhibited high efficiency to activate peroxymonosulfate (PMS) for the degradation of Acid Orange 7. The effects of experimental parameters including initial pH values of dye solution, effect of concentrations of PMS and CoFe 2 O 4 on Acid Orange 7 degradation were studied. Furthermore, CoFe 2 O 4 also displayed an extremely high catalytic performance in the degradation of Methyl Orange, Reactive Brilliant Red X-3B, Methylene Blue and Rhodamine B. CoFe 2 O 4 retained high degradation efficiency and high stability even after being reused for five runs. The inherent magnetism of ferrite leads to easy separation of catalyst from the reaction mixtures. Consequently, the catalyst durability is improved remarkably.
CoFe 2 O 4 magnetic fiber nanomaterial was synthesized using the sol–gel method combined with celloulose template and exhibited high catalytic activity for AO7 degradation in presence of peroxymonosulfate.
研究领域:
环境科学
·
材料科学
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Jia Song,Wenting Li,Jianjiao Xin,Wenbo Wang,Kun Song,Xiaoshuang Chen,Guangming Yin
Nowadays, safe, toughness, flexible and wearable energy storage devices have become a research hotspot. However, the safety and stability of flexible devices are still challenging because traditional wearable energy storage devices are difficult to overcome the problems of leakage, toxic and fragile electrolyte and so on. In this study, we successfully designed and constructed a continuous porous conductive polymer PEDOT:PSS film coated graphene (rGO) and CoFe 2 O 4 nanospheres composite paper electrode material. rGO paper has the advantages of good electrical conductivity and large surface area, but the graphene sheet without oxygen group has very weak adhesion between sheets, and the surface is completely hydrophobic. The water-soluble conductive polymer PEDOT:PSS film successfully increased the toughness and wettability of the graphene composite paper, and the kinetic fitting verified that the polymer improved the rate performance and electrochemical activity of the graphene composite paper. The area specific capacitance, energy density and power density of the symmetric supercapacitor made of rGO/CoFe 2 O 4 /PEDOT:PSS paper are 229.6 mF cm −2 , 25.9 Wh kg −1 and 135.3 W kg −1 . More importantly, the device can be charged in both positive and negative directions, and when change charging direction, the electrochemical performance of the device is also excellent. This solves the safety problem caused by the wrong connection between positive and negative poles of the supercapacitor, and also makes a contribution to the safety development of flexible supercapacitors.
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