MATERIALS CHEMISTRY AND PHYSICS
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2015
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IF 2.259
Gang Jian,Fang Meng,Dongxiang Zhou,Qiuyun Fu,Zhili Du,Chao Yan
A textured CoFe 2 O 4 ceramic was fabricated by reactive template grain growth (RTGG) method using rod-like α-FeOOH particles as templates. The template particles were synthesized by hydrothermal method , the particles showed good crystallization and rod-like shape with a diameter of 0.1–0.2 μm and an aspect ratio of 20–50. { ll0 } oriented CoFe 2 O 4 ceramic was obtained after a sintering process. The ceramic sintered at 1150 °C for 4 h showed dense and oriented structure with orientation degree of 0.89. Different magnetic hysteresis loops were observed along the in-plane and out-of-plane direction of the textured CoFe 2 O 4 , which was due to anisotropy properties of the sample. The textured ceramic exhibited an in-plane M s enhancement (355 emu/cm 3 ) compared to that of the non-textured ceramics (320 emu/cm 3 ) in the same sintering conditions.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
·
IF 8.3
Yichi Zhang,Jingang Zhang,Dongping Sun,Jean-Marie Basset,Jingxia Qian,Lu Zhou
This study employed nonahydrate ferric nitrate and hexahydrate cobalt nitrate as precursors to fabricate catalysts via calcination, varying the iron-cobalt molar ratios (1: 5, 3: 4, 1: 1, 4: 3, 5: 1). It identified the optimal ratio for catalytic decomposition of methane (CDM) performance. Furthermore, adjusting the calcination temperature enabled control over the spinel content in catalysts with the optimal Fe: Co ratio (3: 4), resulting in a range of single and bimetallic catalysts with diverse spinel contents. Comparative analysis revealed the superior performance of bimetallic catalysts compared to single-metal counterparts. Specifically, under the conditions of 800 °C and GHSV 6 L/(g cat. ·h), Fe 3 Co 4 -700 °C achieved a maximum methane conversion of 75.6%, after maintaining a CDM test for 6 h, there is no decrease in stability. This is because the synergistic effect of Fe and Co bimetallic in the Fe 3 Co 4 -700 °C catalyst facilitates the transfer of charges between the bimetals, alters the surface charge density of the catalyst, enhances the electron donation capability of active sites, thereby favoring the adsorption and cracking processes of methane. XRD indicates that this catalyst with smaller crystallite size benefits the dispersion of catalytic active sites, thus improving the CDM performance. Results underscored the significant impacts of calcination temperature and metal ratio on the catalyst's spinel content and crystallite size. Characterization of spent catalysts unveiled carbon products primarily comprising carbon nano-onions, graphite, and carbon nanotubes, with the optimal catalyst yielding 5.8 g C /g cat. . Increasing calcination temperatures facilitated the formation of the spinel phase. At 150 °C, the Fe: Co (3: 4) catalyst had minimal spinel content, whereas at 300 °C, 700 °C, and 1000 °C, the contents are 9%, 11%, and 24%, respectively. Notably, at 1500 °C, the spinel content dramatically surged to 62%. The relationship between spinel content and spent catalyst crystallite size is not linear, the smaller crystal size is more conducive to the dispersion of catalytic active sites, thereby improving the CDM performance. Catalysts without spinel doping exhibited a crystallite size of around 32.2 nm, which decreased to 25.6 nm with 11% spinel content, and increased to 42.7 nm with 62% content. These findings yield profound insights into the influence of calcination temperature and iron cobalt ratios on catalyst performance, providing valuable guidance for the production of efficient CDM catalysts.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Na Xiao,Ping Han,Zhaoqi Chen,Qiuling Chen
Under the spotlight for their potential to reduce over-potential, photo-assisted Li–O 2 batteries still face a key challenge: the rapid recombination of photo-generated electron-hole pairs, which limits their efficiency. In this study, we address this limitation by designing a Li–O 2 battery that integrates both photo and magnetic field assistance, using an S-scheme MXene/In 2 S 3 /CoFe 2 O 4 heterojunction photocathode. This unique combination enhances visible light absorption and generates a strong built-in electric field, facilitating effective charge separation and boosting photocatalytic activity. During discharge, photo-generated electrons participate in the oxygen reduction reaction, while photo-induced holes contribute to the decomposition of discharge products during charging. Furthermore, the introduction of a magnetic field, confirmed through vibrating sample magnetometer, Mössbauer spectroscopy, X-ray absorption near edge structure, and cyclic voltammetry analyses, enhances electron-hole separation via Lorentz forces and spin–orbit coupling, accelerating the formation and decomposition of Li 2 O 2 . With this synergistic approach, the battery achieves a high specific capacity of 26,500 mAh g −1 , ultra-low oxygen reduction/evolution reaction over-potentials of 0.08 V/0.17 V, and a long cycle life of 2000 cycles with energy efficiency of 98.11 %. This work demonstrates the promising potential of combining photo and magnetic field effects to improve the electrochemical performance of Li–O 2 batteries, opening new avenues for high-performance energy storage systems.
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Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Xuanran Geng,RenFu Zhang,Peiyun Zhang,Xiaoying Yuan,Can Yang,Yidong Hou,Jinshui Zhang,Meirong Huang
The integration of photoelectrochemical (PEC) technology with persulfate-based advanced oxidation processes has emerged as a promising approach for efficient pollutant removal in environmental remediation. Herein, we developed a novel PEC system combining a Co 3 O 4 /BiVO 4 (CO/BVO) photoanode with a CoFe 2 O 4 /carbon paper (CFO/CP) cathode for activating peroxymonosulfate (PMS) toward bisphenol A (BPA) removal. The enhanced photogenerated charge separation in CO/BVO and the PMS activation by CFO/CP in the PEC system enabled complete BPA degradation within 60 minutes under optimized conditions (1.0 V bias, 1.0 mM PMS). The influence of PMS concentration, applied bias, pH, and coexisting anions on BPA degradation was thoroughly investigated. Radical scavenging experiments combined with electron paramagnetic resonance analysis identified •SO 4 - , •OH, and photogenerated holes as dominant reactive species. The system also exhibited good stability over five consecutive cycles, with minimal metal ion leaching. This work demonstrates the potential of an efficient PEC system integrated with sulfate radical-based AOPs, offering an innovative approach for organic pollutant remediation in wastewater treatment.
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Journal of Water Process Engineering
·
2024
·
IF 6.3
Zhian Jin,Xuanting Zhao,Min Zhang,Ying Li,Jing Guo,Yeqing Lan,Cheng Chen
In order to achieve the environmental goal of waste treatment by waste, waste self-heating bags, a common household waste rich in iron oxide , activated carbon, and vermiculite , were reutilized as the raw material for the one-pot fabrication of a CoFe 2 O 4 composite (CoFe 2 O 4 -CV). The performance, mechanism, and application potential of CoFe 2 O 4 -CV for high-salinity wastewater remediation were investigated. The results indicated that the presence of activated carbon and vermiculite promoted the dispersion of CoFe 2 O 4 nanoparticles , which enhanced the catalytic performance of peroxymonosulfate (PMS) activation for Rhodamine B (RhB) degradation. At a concentration of 0.1 g/L CoFe 2 O 4 -CV and 0.5 mmol/L PMS, > 99% of RhB was eliminated within 15 min. CoFe 2 O 4 -CV also exhibited splendid recyclability due to its strong magnetism and stability. Quenching experiments and spectroscopic studies showed that dissolved free sulfate radicals (SO 4 •- ), surface-bound SO 4 •- (≡SO 4 •- ), singlet oxygen ( 1 O 2 ), and high-valence metal-oxo species (≡Co(IV)=O/≡Fe(IV)=O) jointly contributed to RhB degradation. Non-radical pathways involving ≡SO 4 •- , 1 O 2 , and ≡Co(IV)=O/≡Fe(IV)=O also played a crucial role. Moreover, ion competition experiments indicated that the CoFe 2 O 4 -CV activated PMS system showed anti-interference ability towards humic acid and high-concentration anions. Thus, the CoFe 2 O 4 -CV/PMS system achieved the effective removal of RhB and other dye contaminants under high-salinity conditions. This work demonstrates the practical possibility of waste reutilization treating high-salinity wastewater based on an advanced oxidation process .
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Scientific Reports
·
2025
·Vol. 15
·期 1
·1-13
·
IF 3.9
Ding Xiaojun,Liu Dingbang,Wang Zihao,Peng Yilin,Fu Shuqi,Zhan Na,Jiang Qing,Li Mingyang,Wan Haiyang,Liu Jiansheng,Zhao Xinsheng,Gao Fei,Zhou Weiping,Cheng Zhenzhi,Wu Zhongkai,Luo Guangsheng
Transition metal oxides (TMOs), especially spinel-type iron oxides, are widely used as electrode materials for supercapacitors due to their high specific capacitance. However, as a kind of pseudocapacitive electrode material, transition metal oxide undergoes volume changes during the charge–discharge process, leading to a decrease in its cycling stability. Carbon nanotubes (CNTs), as a common carbon-based material, exhibit excellent cycling stability. In this study, we have successfully synthetized CoFe 2 O 4 @Co 3 O 4 /CNT by utilizing zeolitic imidazolate framework (ZIF) as a template. The resultant material exhibits a porous network architecture and the synthesized material was subsequently utilized as an electrode in supercapacitor applications, exhibiting a remarkable specific capacitance of 641 C g −1 at 1 A g −1 . The stability of the electrode were evidenced by its ability to retain 62.3% of its initial capacitance after 5000 cycles at the high current density of 10 A g −1 , indicating its potential for long-term energy storage applications.
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ENERGY CONVERSION AND MANAGEMENT
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2024
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IF 9.9
Muhammad Usman,Faiqa Nadeem,Hina Ramzan,Muneeb ur Rahman,Fuhua Shen,Muhammad Shahzaib,Reeta Rani Singhania,Anil Kumar Patel,Zhiping Zhang,Shengyong Liu,Nadeem Tahir
The interaction between the photo-induced charges from photo nanocatalysts (PNCs) and biohydrogen production strains plays a key role in controlling the metabolism mechanism in fermentative biohydrogen production from lignocellulosic biomass wastes. Thus, in the present study, two strains of Rhodopseudomonas palustris (PNSB) and a mixed consortium of HAU-M1 were evaluated for their biohydrogen production potential from corn stover (CS), whereas metabolism was catalyzed through photo-induced electrons from magnetic PNCs of cobalt ferrite (CoFe 2 O 4 ). The threshold concentration of CoFe 2 O 4 (400 mg/L) produced 428.62 mL and 373.30 mL biohydrogen in PNSB and HAU-M1, which is 129.0 % and 81.12 % higher as compared to respective control groups (CGs), respectively. The presence of PNCs provides the photo-induced electrons, which catalyze the metabolic processes as butyric acid increases by 96.29 % and 94.87 % in PNSB and HAU-M1, respectively, hence increasing hydrogen production. The results were supported by microbial community investigation, which showed that the incorporation of the appropriate concentration of PNCs effectively changes the bacterial community dynamics and diversifies the phyla ( Firmicutes , Proteobacteria , and Bacteroidetes ) and hydrogen-producing genus Clostridium . The recovered yield of CoFe 2 O 4 PNCs from PNSB and HAU-M1 fermentative mediums in three consecutive cycles was (90.87 %, 88.94 %), (80.25 %, 72.25 %), and (69.75 %, 60.80 %) respectively showing potential for recycling catalysts during the fermentation process. Thus, selecting the right photocatalysts and strain can affect metabolism and biohydrogen production, while recyclability reduces environmental leaching.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2025
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IF 6.3
Xinyang Liu,Fengyu Wu,Tongbo Zhang,Fenyang Tian,Menggang Li,Weiwei Yang,Yongsheng Yu
The multi-interface structure plays a crucial role in facilitating the effectiveness of electromagnetic wave (EMW) absorption in nanomaterials. However, designing and fine-tuning such structure remain challenging due to the limited understanding of the relationship between structural characteristics and dielectric loss properties. Herein, we present a sponge-structured dual-core @ shell CoFe 2 O 4 /CeO 2 @C nanocomposite featuring abundant heterojunctions and robust dielectric-magnetic coupling networks. This design aims to attain excellent impedance matching and significantly enhance EMW absorption performance of the nanocomposite. Specifically, CoFe 2 O 4 /CeO 2 @C nanocomposite achieves an effective absorption bandwidth (EAB) of 6.13 GHz with a thickness of merely 2.2 mm. The exceptional EMW absorption performance can be attributed to the synergistic effect of multi-loss mechanisms, including interfacial polarization induced by the porous dual-core @ shell structure, oxygen vacancy defects arising from the intrinsic structural characteristics of CeO 2 and conductive loss brought by reversible migration of Co 2+ /Fe 3+ and Ce 3+ /Ce 4+ . This study offers a robust strategy for the advancement of ferrite-based composites with enhanced dielectric properties and offers novel insights for the design of broadband EMW absorbing materials.
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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.
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CHEMOSPHERE
·
2021
·
IF 7.086
Nguyen Trung Dung,Le Thuy Duong,Nguyen Thi Hoa,Vu Dinh Thao,Le Viet Ngan,Nguyen Nhat Huy
In this study, cobalt ferrite coated carbon felt (CoFe 2 O 4 /CF) was synthesized by solvothermal method and applied as cathode for electro-Fenton (EF) treatment of tartrazine (TTZ) in water. The materials were characterized by SEM, XRD, FTIR, CV, and EIS to explore their physical, chemical, and electrical properties. The effects of solvothermal temperature and metal content on the TTZ removal were examined, showing that 220 °C with 2 mM of Co and 4 mM of Fe precursors were the best synthesis condition. Various influencing factors such as applied current density, pH, TTZ concentration, and electrolytes were investigated, and the optimal condition was found at 8.33 mA cm −2 , pH 3, 50 mgTTZ L −1 , and 50 mM of Na 2 SO 4 , respectively. By radical quenching test, , 1 O 2 , and HO were recognized as the key reactive oxygen species and the reaction mechanism was proposed for the EF decolorization of TTZ using CoFe 2 O 4 /CF cathode. The reusability and stability test showed that the highly efficient CoFe 2 O 4 /CF cathode is very promising for practical application in wastewater treatment , especially for dyes and other recalcitrant organic compounds to improve its biodegradability .
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ELECTROCHIMICA ACTA
·
2021
·
IF 6.901
Wei Chen,Guangfu Qian,Qinglian Xu,Miaojing Pan,Lin Luo,Shibin Yin
The exploitation of catalysts with low-cost and superior oxygen evolution reaction (OER) and urea oxidation reaction (UOR) performance is important to expand the application of water splitting. Herein, the FeCo/CoFe 2 O 4 nanoflowers are successfully embedded in N-doped graphitic carbon (NGC) by hydrothermal method and subsequently annealing process (FeCo/CoFe 2 O 4 @NGC). It only needs 1.47 V and 1.32 V for OER and UOR to produce a current density of 10 mA cm −2 . Besides, it can work continuously for 100 h at different current densities (10; ∼ 1000 mA cm −2 ), displays outstanding stability, which is mainly ascribed to the N-doped carbon encapsulated FeCo modified CoFe 2 O 4 heterostructure and porous structure. This study thus provides a simple synthesis method to design and manufacture low-cost and high-performance catalytic materials for OER and UOR, and promotes the industrial application of water splitting.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Shixian Zhang,Xinshan Rong,Ting Sun,Ping Gao,Jun Liu,Xuchun Qiu,Xiangtong Zhou,Zhiren Wu
With the increasingly severe environmental problems the traditional high pollution and high energy consumption of nitrogen fixation industry is striving to develop new cleaner production technology. In this work, we designed and prepared the 3D porous g-C 3 N 4 with nitrogen vacancy (3DV N PCN) through a combination of alkali-assisted and supramolecular self-assembly methods. Subsequently, we synthesized, characterized and employed a Z -scheme 3DV N PCN/CoFe 2 O 4 photocatalyst with strong nitrogen adsorption and activation for nitrogen photofixation. The results show that the best photofixation nitrogen efficiency of the photocatalyst can reach 14.66 mmol/g/h within 120 min. This nitrogen fixation process carried out at room temperature, and only requires water and nitrogen as raw materials, which has the advantage of being energy efficient, environmental friendly and pollution-free.
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