RSC Advances
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2017
·Vol. 7
·期 64
·40673-40681
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IF 3.108
Xinlin Liu,Yingying Qin,Yongsheng Yan,Peng Lv
A magnetic photocatalyst, CdS/CoFe2O4/rGO, has been successfully prepared via a simple hydrothermal method. The photocatalytic activity of the as-obtained composite photocatalyst was evaluated using the degradation of tetracycline. When compared with single CdS and CoFe2O4, the hybrid material (CdS/CoFe2O4/rGO) can enhance the photocatalytic activity. The photocurrent responses and PL spectra indicate that the composite photocatalyst can effectively separate the electron–hole pairs and restrain their recombination. This was attributed to the high charge carrier mobility of rGO and the heterostructured photocatalytic system, which promotes the separation of charge carriers. In all, the CdS/CoFe2O4/rGO photocatalyst, as a strong magnetic photocatalyst, is promising for further practical application in wastewater treatment.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
RSC Advances
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2018
·Vol. 8
·期 16
·8607-8614
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IF 2.936
Lingxia Zheng,Lingtong Guan,Guang Yang,Sanming Chen,Huajun Zheng
CoFe2O4/reduced graphene oxide (CoFe2O4/rGO) hydrogel was synthesized in situ via a facile one-pot solvothermal approach. The three-dimensional (3D) network structure consists of well-dispersed CoFe2O4 nanoparticles on the surfaces of graphene sheets. As a binder-free electrode material for supercapacitors, the electrochemical properties of the CoFe2O4/rGO hybrid hydrogel can be easily adjusted by changing the concentration of the graphene oxide (GO) precursor solution. The results indicate that the hybrid material made using 3.5 mg mL−1 GO solution exhibits an outstanding specific capacitance of 356 F g−1 at 0.5 A g−1, 68% higher than the pure CoFe2O4 counterpart (111 F g−1 at 0.5 A g−1), owing to the large specific surface area and good electric conductivity. Additionally, an electrochemical energy storage device based on CoFe2O4/rGO and rGO was assembled, which exhibits a high energy density of 17.84 W h kg−1 at a power density of 650 W kg−1 and an excellent cycling stability with 87% capacitance retention at 5 A g−1 after 4000 cycles. This work takes one step further towards the development of 3D hybrid hydrogel supercapacitors and highlights their potential application in energy storage devices.
研究领域:
材料科学
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能源存储与转换
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2016
·Vol. 27
·期 9
·9278-9285
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IF 1.798
Liu Ziyu,Xu Guangliang,Zhang Ming,Xiong Kun,Meng Pingyuan
Cobalt ferrite/reduced graphene oxide (CoFe 2 O 4 /RGO) nanocomposites were initially prepared by the interaction of alkyne-functionalized CoFe 2 O 4 NPs and azide-functionalized graphene oxide (GO–N 3 ) via the Cu (I)-catalyzed click reaction. The morphology and structure of CoFe 2 O 4 /RGO were investigated by means of XRD, FTIR, TGA, TEM, SEM and the electromagnetic parameters were measured by vector network analyzer. For CoFe 2 O 4 /RGO composites with click reaction, the minimum reflection loss could reach −40 dB at 6.8 GHz with a matching thickness of 4.0 mm, and also it had a bandwidth below −10 dB ranging from 5.8 to 8.5 GHz. The CoFe 2 O 4 /RGO composites with click reaction exhibited better microwave absorbing performance than the physical mixture. Furthermore, the covalent ligation between CoFe 2 O 4 NPs and graphene oxide could make the composites have a promising future in electromagnetic wave absorption materials.
研究领域:
材料科学
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纳米技术
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电磁材料
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化学
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DOI
高影响因子
Environmental Science-Water Research & Technology
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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.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
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2025
·
IF 3.6
Jian-Wu Xiao,Dong-Dong Mai,Dong-Liang Shi,Guo-Cui Bao,Yin-Qian Lu,Li-Bao Chen,Xiao-Ying Pei,Jing-Shui Xu,Fu-An He,Kwok-Ho Lam
The CoFe 2 O 4 @reduced graphite oxide (rGO) was prepared by a one-step solvothermal reaction, and then the Ag nanoparticles were deposited on the CoFe 2 O 4 @rGO by a green mild reduction reaction to form the novel Ag-CoFe 2 O 4 @rGO filler, followed by the modification of Ag-CoFe 2 O 4 @rGO using hexadecyltrimethoxysilane to form the novel H-Ag-CoFe 2 O 4 @rGO filler. The homogeneous distribution of the Ag-CoFe 2 O 4 @rGO and H-Ag-CoFe 2 O 4 @rGO fillers in the polar PVDF plastic polymer and nonpolar SBS elastomer copolymer, respectively, to form the corresponding composites was proved by SEM. The polar crystal content of the PVDF matrix in the Ag-CoFe 2 O 4 @rGO(10 wt.%)/PVDF composite was 36.13%, while the corresponding value for pure PVDF was 29.38%. The dielectric constant at 1000 Hz of Ag-CoFe 2 O 4 @rGO(10 wt.%)/PVDF and H-Ag-CoFe 2 O 4 @rGO(10 wt.%)/SBS composites was 15.54 and 2.78, respectively, while the corresponding values for pure PVDF and pure SBS were 8.39 and 2.05, respectively. Additionally, although both pure PVDF and pure SBS were non-magnetic, the magnetization values of Ag-CoFe 2 O 4 @rGO(10 wt.%)/PVDF and H-Ag-CoFe 2 O 4 @rGO(10 wt.%)/SBS composites were 0.83 emu/g and 0.47 emu/g, respectively, at 50,000 Oe. The as-prepared Ag-CoFe 2 O 4 @rGO/PVDF and H-Ag-CoFe 2 O 4 @rGO/SBS composites should have the potential for different applications including dielectric capacitors, dielectric elastomers, sensors, EMI shielding, and so on. Graphical Preparation process of CoFe 2 O 4 @rGO and Ag-CoFe 2 O 4 @rGO hybrid filler.
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高影响因子
ACS Applied Nano Materials
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2018
·
IF 0
Kun Zhang,Junjian Li,Fan Wu,Mengxiao Sun,Yilu Xia,Aming Xie
The rational design of specific nanostructures with desirable combination of electrical conductivity and magnetism is of significant importance in the field of electromagnetic absorption. To date, it is still difficult to uniformly coat magnetic composition on reduced graphene oxide (RGO) surface, especially through a metal–organic frameworks (MOFs) pyrolyzation strategy, just because of difficulty in even deposition of MOFs on graphene oxide (GO). Herein, we successfully deposit MOFs on GO to form sandwich MOFs/GO/MOFs through the addition of Fe3+ to MOFs precursor. Then, we adopt a temperature-controlled pyrolysis strategy to transform MOFs/GO/MOFs into sandwich CoFe2O4/RGO/CoFe2O4. The nanomaterial exhibits remarkable electromagnetic absorption (EMA) performance, where its maximum effective width reaches 7.08 GHz under 2.6 mm. It is thought that the synergy of electric loss, magnetic loss, and impedance match is ascribed to high-perforamnce EMA of this sandwich nanostructure.
研究领域:
材料科学
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电磁学
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DOI
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yue Guo,Yanchun Tao,Xiaowei Ma,Jing Jin,Sisi Wen,Wei Ji,Wei Song,Bing Zhao,Yukihiro Ozaki
Mercuric ion (Hg 2+ ) is a toxic metal ion in the environment, which will seriously damage the people's health. Therefore, the simple sensitive detection of Hg 2+ is of great significance. In this work, Ag-CoFe 2 O 4 /reduced graphene oxide (rGO) nanocomposites were synthesized via a one-pot microwave-assisted reaction, which can directly oxidize 3, 3′, 5, 5′-tetramethylbenzidine (TMB) to produce a light blue. Then we have developed a dual colorimetric and SERS detection of Hg 2+ based on the stimulus of intrinsic oxidase-like catalytic activity of Ag-CoFe 2 O 4 /rGO nanocomposites. It is demonstrated that the interaction between Hg 2+ and Ag nanoparticles can occur in a short time, which includes the formation of Ag-Hg alloy due to the reduction of Hg 2+ . In addition, the formation of such alloy can enhance the oxide-like activity, which makes the detection of Hg 2+ more sensitive. By using the SERS detection approach, the assay can detect Hg 2+ as low as 0.67 nM. This detection ability is much better than previous reports based on the enzyme-like catalytic reaction, which is also lower than the maximum value of Hg 2+ permitted in drinking water by the World Health Organization (WHO) (30 nM) and United States Environmental Protection Agency (EPA) (10 nM). In addition, this detection system also shows an excellent selectivity toward Hg 2+ due to the affinity of Hg to Ag-CoFe 2 O 4 /rGO nanocomposites. Therefore, this approach is potentially applicable for the sensitive determination of Hg 2+ in real environmental conditions.
研究领域:
环境科学
·
分析化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Yuhang Zhang,Jin Qian,Peifang Wang,Yuxuan He,Bianhe Lu,Sijing Tang,Kailin Xu
In this study, ternary magnetic nanocomposites (SrTiO 3 /CoFe 2 O 4 /rGO, SCG) doped with cobalt ferrite and loaded with rGO were successfully synthesized, and utilized to rapidly activate PMS to degrade LVF. After evaluating the efficacy of samples with different loading loads, SCG-1 (1 % wt rGO loading) was selected for further testing due to its optimal catalytic activity (degradation efficiency reached 87.4 % in 5 min). Quench experiments and electron paramagnetic resonance (EPR) analysis showed that SO 4 − , 1 O 2 , OH were the main active substance involved in LVF degradation. Based on the redox cycle of Co and Fe ions and the platform provided by perovskite and rGO, the reaction can be carried out quickly. The vulnerable sites and possible degradation pathways of LVF were further analyzed by density functional theory (DFT) calculation and LC-MS/MS analysis, and the developmental toxicity and ecological risk of intermediate products were determined based on toxicity assessment software (T.E.S.T). This study provided a new vision for realizing rapid antibiotic degradation in water environments and provided theoretical support for the subsequent research on novel nanomaterials.
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高影响因子
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