Russian Journal of Physical Chemistry A
·
2019
·Vol. 93
·期 2
·393-399
·
IF 0.581
Baogang Wang,Bin Zhao
Abstract Carbon dots (CDs)/CoFe 2 O 4 mesporous nanosphere composites were prepared. In comparison with CoFe 2 O 4 , the CDs/CoFe 2 O 4 composites exhibited the enhanced photocatalytic activity in the degradation of methylene blue (MB) in the presence of H 2 O 2 under the visible light irradiation. Specifically, the degradation rate attained using the CDs(4 wt %)/CoFe 2 O 4 composite was about 3.65 times higher than that with neat CoFe 2 O 4 . Moreover, the CoFe 2 O 4 paramagnetic nanospheres allowed facile repeatable use of CDs/CoFe 2 O 4 composites after magnetic separation. After five runs, the reduction of degradation rate was less than 5%, reflecting favorable photostability and magnetic separability of CDs/CoFe 2 O 4 composites. The CDs not only enhanced visible light utilization efficiency of CoFe 2 O 4 due to up-conversion photoluminesence, but also promoted the transfer and separation of electron-hole pairs as a result of their outstanding charge transfer characteristics, which collectively accelerate the generation of reactive species (such as • \({\text{O}}_{2}^{ - }\) , • OH, and h + ) in the presence of H 2 O 2 .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Desheng Yang,Chaofei Bai,Fengdan Zhu,Chang Liu,Cheng Zhao Tu,Guoping Li,Yunjun Luo,Tianfu Zhang
Designing highly active catalysts and constructing the interface between ammonium perchlorate (AP) and catalysts are effective strategies for achieving efficient thermal decomposition of AP, which is an urgent need for developing AP based composite solid propellants. Herein, we report an impregnation vacuum freeze-drying strategy to encapsulate AP in an independent three-dimensionally ordered macroporous (3DOM) CoFe 2 O 4 (3D CFO) spinel, resulting in a novel 3D CFO encapsulated AP nanocomposite materials (AP-3DCNCs). The connected pores of 3D CFO provide a model structure for the growth of AP nanocrystals, while the impregnation vacuum freeze-drying strategy ensures the uniform distribution of AP crystals in pores, effectively achieving the size effect of AP nanocrystals (39.88 ∼ 55.50 nm). By adjusting the loading capacity of the AP, the AP-3DCNCs configuration was effectively controlled. The thermal decomposition of AP-3DCNCs is greatly enhanced due to their unique configuration. The high-temperature decomposition temperature is significantly reduced by 180.06–141.78 °C, and the maximum equivalent heat release increased by 2.03 times. It can be foreseen AP-3DCNCs are attractive nanocomposites for the thermal decomposition of AP, and these results provide a convenient strategy for the preparation of transition metal-based composite catalysts with promising applications in the field of solid propellants.
研究领域:
材料科学
·
推进剂领域
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2025
·
IF 3.2
Rui Guofen,Hu Zihao,Wu Huiqi,Ma Jianfeng
Composites of MIL-101(Fe)/CoFe 2 O 4 were prepared by a simple solvothermal approach and these composites were explored for tetracycline (TC) degradation by using light and persulfate (PS). MIL-101(Fe)/CoFe 2 O 4 catalyst showed superior catalytic performance when combined with photocatalysis and chemical catalysis. Experimental results suggest that the degradation efficiency reached 83% within 40 min. The TC adsorption ability of MIL-101(Fe)/CoFe 2 O 4 was tightly associated with pH, which can be interpreted through isoelectric point. Oxygen-active species, containing singlet oxygen ( 1 O 2 ) or superoxide radicals (O· 2‾), were also generated when there was dissolved oxygen, which could decompose the TC organic contaminant in solution. To be specific, MIL-101(Fe)/CoFe 2 O 4 /PS/Vis catalytic system was capable of eliminating TC through forming h + , 1 O 2 , O· 2‾, hydroxyl radicals (·OH) and sulfate radicals (·SO 4 ‾) species. Moreover, MIL-101(Fe)/CoFe 2 O 4 composite material showed outstanding stability.
研究领域:
环境科学
·
催化材料
✓ 已验证
产品关联
DOI
高影响因子
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.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 35
·期 1
·1-13
·
IF 2.8
Ding Yiwen,Ren KeJu,Zeng Zhixin,Meng Gang,Gao Rongli,Deng Xiaoling,Chen Gang,Cai Wei,Fu Chunlin,Wang Zhenhua,Lei Xiang
The potential applications of magnetoelectric composites in capacitors, sensors, memory electronic devices, and energy harvesting devices have aroused great interest due to their mutual coupling between ferroelectric and ferromagnetic phases. In this paper, BFO/CFO composite films were prepared by the sol–gel method, and the regulation of magneto-photoelectric and coupling properties of BFO/CFO films with different compositions was studied. The results show that with the increase of BFO composition, the interface between BFO layer and BFO layer also appears, the dielectric constant of the film decreases with increasing the content of BFO, and the photoelectric conversion efficiency of the film increases at first and then decreases with the increase of BFO content. When the composition is 4BFO/6CFO, the photoelectric conversion efficiency of the composite film is the highest, which is 2.02 × 10 −3 %. With the increase of CFO content, the remanent magnetization and saturation magnetization of the film increase gradually. However, when the compositions are 4BFO/6CFO and 3BFO/7CFO, their leakage current is high, resulting in the degradation of ferroelectric properties. The composition 5BFO/5CFO has the highest magnetodielectric and photo induced magnetodielectric response, the corresponding values are 2.21% and 3.88%, respectively. The magnetoelectric coupling coefficient of the film is greatly increased under the action of light, reaching 115%, which could plausibly relate to the photovoltaic effect and the photostriction effects of the film. These results may provide good guidance on designing new photoelectromagnetic detector.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Chenguang Qian,Xiangwei Zhang,Qi Tan,Yi Wen,Zhicheng Wang,Fang Yuan,Chunquan Li,Zhiming Sun
Developing small-size and high-distribution CoFe 2 O 4 nanoparticles with abundant accessible active sites is exceedingly vital for optimizing the activation efficiency of peroxymonosulfate (PMS). Herein, silica hollow (H-SiO 2 ) microspheres were employed as the carrier of CoFe 2 O 4 for decreasing its particle size and then boosting PMS activation. The introduction of H-SiO 2 microspheres alleviated the agglomeration effect of CoFe 2 O 4 , with CoFe 2 O 4 uniformly anchored on the surface of H-SiO 2 . The optimized 50-CHF exhibited excellent bisphenol A (BPA) degradation performance under the PMS system, wherein 98.9 % BPA was removed within 20 min. Given the increase of active sites and the robust active species production, BPA was more easily assembled and degraded on the surface of 50-CHF. Furthermore, quenching experiments indicated that SO 4 ∙ - and 1 O 2 were the main active species for BPA degradation. This work provides new avenues for the application of H-SiO 2 microspheres and the development and application of cobalt ferrate composite catalysts.
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
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 10
·4358-4371
·
IF 3.442
Zhu Zhi,Ma Changchang,Yu Kesheng,Lu Ziyang,Liu Zhi,Yan Yongsheng,Tang Xu,Huo Pengwei
It is still a challenging work to realize the universality of photocatalytic materials for unselectively removing environmental pollutants in water. Here, a ternary magnetism CoFe 2 O 4 /g-C 3 N 4 /HNTs heterojunction photocatalyst is firstly prepared, and the morphology, crystalline property, surface area, and magnetic recycling capability of the photocatalyst were investigated. The CoFe 2 O 4 /g-C 3 N 4 /HNTs shows a superior degradation efficiency for degrading 2-mercaptobenzothiazole (MBT) than that of pure g-C 3 N 4 . The high degradation performance that derives from the hollow structure of halloysite nanotubes (HNTs) can inhibit stacking of g-C 3 N 4 , which results in a larger specific surface area and more abundant reaction sites. Meanwhile, the heterojunction structure between g-C 3 N 4 and CoFe 2 O 4 improved the separation efficiency of charge carriers. In addition, the intermediate products, degradation pathway, and reaction mechanism of representative MBT pollutant over the CoFe 2 O 4 /g-C 3 N 4 /HNTs photocatalyst are revealed in depth. This work makes an important development.
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
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jiao-Jiao Duan,Ru-Lan Zhang,Jiu-Ju Feng,Lu Zhang,Qian-Li Zhang,Ai-Jun Wang
Developing cost-effectiveness and superior electrocatalysts is crucial to improve the efficiency of oxygen evolution reaction (OER) in water splitting system. Hence, flower-like phosphorus doped Ni 3 S 2 /CoFe 2 O 4 arrays (P-Ni 3 S 2 /CoFe 2 O 4 /NF) were generated on three-dimensional (3D) nickel foam (NF) via the two-step hydrothermal treatment and subsequent phosphorization. Additionally, a series of control experiments were conducted to investigate the formation mechanism. By virtue of the unique 3D configurations and multi-compositions, the as-prepared catalyst exhibited greatly improved OER performance in 1.0 M KOH solution, with the overpotential of only 254 mV at 50 mA cm −2 and low Tafel slope of 54.43 mV dec −1 . This study provides a feasible approach for preparing advanced electrocatalyst in energy conversion and storage devices.
研究领域:
材料科学
·
电催化
·
能源转换与存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 10
·1800223
·
IF 4.384
Shan Fan,Wen Wang,Hua Ke,Yu Zhou
Different morphology CoFe 2 O 4 nanoparticles (nano random particles, nanospheres, solid nanocubes) are successfully synthesized via a facile one-step method, by controlling the amount of the surfactant. The solid nanocube morphology CoFe 2 O 4 is annealed at 350 °C to form porous and hollow structure. The interesting porous hollow nanostructural CoFe 2 O 4 has excellent electrochemical properties.
研究领域:
材料科学
·
纳米技术
·
电化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 59
·47820-47829
·
IF 3.84
Ziyang Lu,Ming He,Lili Yang,Zhongfei Ma,Li Yang,Dandan Wang,Yongsheng Yan,Weidong Shi,Yang Liu,Zhoufa Hua
A novel imprinted CoFe2O4/MWCNTs photocatalyst was prepared through the combination of a hydrothermal method and suspension polymerization based on 2-mercaptobenzothiazole (MBT) as the molecular template, pyrrole as the imprinted functional monomer and conductive polymerizable monomer, and CoFe2O4/MWCNTs as the matrix material. The results indicated that the surface imprinted layer was successfully coated on the surface of CoFe2O4/MWCNTs and polypyrrole (PPy) was formed and existed in the surface imprinted layer, the magnetic saturation value of the novel imprinted CoFe2O4/MWCNTs photocatalyst was 19 emu g−1. Moreover, compared with other photocatalysts, the novel imprinted CoFe2O4/MWCNTs photocatalyst not only had a high photocatalytic efficiency (57.09%), but also possessed a strong ability for selective recognition and photodegradation of MBT (the coefficients of selectivity of the novel imprinted CoFe2O4/MWCNTs photocatalyst relative to CoFe2O4/MWCNTs and the non-imprinted CoFe2O4/MWCNTs photocatalyst was 3.37 and 3.28, respectively). In addition, in the process of the photodegradation reaction, h+ and ˙OH were the main oxidative species, ˙O2− played a very small role.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Yanlin Li,Wenyuan Duan,Jian Wei
At present, there is an urgent need to design sensitive substrates for the Raman analysis system to detect potential substances that have major ramifications for health care and the ecological environment. In this work, CoFe2O4/Ag nanostructures with two different morphologies were successfully synthesized as surface-enhanced Raman scattering (SERS) substrates. The as-prepared strawberry-like CoFe2O4@SiO2@Ag and snowman-like CoFe2O4-Ag Janus not only displayed high sensitivity due to the surface plasma resonance (SPR) of Ag nanoparticles and special micro-nano structure but also showed good stability, which was determined by Raman measurement and enhancement factor calculation. Moreover, excellent magnetic response ensured that the composites could be separated rapidly and reused effectively. It was demonstrated that the as-synthesized CoFe2O4@SiO2@Ag and CoFe2O4-Ag Janus composites had great potential as separable, reusable, and active SERS substrates.
研究领域:
材料科学
·
分析化学
·
环境科学
·
生物医学
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 21
·215603
·
IF 3.953
Jiajun Xu,Dong Liu,Yubo Meng,Shiyu Tang,Fei Wang,Chao Bian,Xiaoyue Chen,Siren Xiao,Xiuxia Meng,Naitao Yang
Biomass-derived carbon materials have received a surge of scientific attention to develop lightweight and broadband microwave absorbers. Herein, rodlike porous carbon materials derived from cotton have been fabricated with uniformly dispersed CoFe2O4 nanoparticles via facile and scalable process. The combination of magnetic particles and carbonaceous material is advantageous to realize the magnetic-dielectric synergistic effect which could effectively promote the dissipation of incident waves, giving rise to an optimal reflection loss value of –48.2 dB over a qualified bandwidth (4.8 GHz) at 2.5 mm. The cotton-derived carbon rods with conductive network not only act as a supporter to carry the CoFe2O4 nanoparticles, but also provide massive heterointerfaces to facilitate the interfacial polarization. In consideration of the renewable and abundant resource of cotton, the as-prepared CoFe2O4/C composites would meet the increasing demand of lightweight and highly efficient microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
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