JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2017
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IF 3.012
Shuo Duan,Yuming Huang
A novel electrochemical sensor was developed for the sensitive and selective detection of Cu 2 + , Pb 2 + and Cd 2 + , which was based on NH 2 -MIL-88(Fe)-rGO composite modified glass carbon electrode (NH 2 -MIL-88(Fe)-rGO/GCE). The NH 2 -MIL-88(Fe)-rGO composite was facilely prepared by a one-step method and characterized by SEM, XRD, Raman spectrum and electrochemical methods. The stepwise GCE modified process was investigated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The electrochemical behaviors of Cu 2 + , Pb 2 + and Cd 2 + ions on the NH 2 -MIL-88(Fe)-rGO/GCE were explored by differential pulse anodic stripping voltammetry (DPASV). It was found that NH 2 -MIL-88(Fe)-rGO was capable of adsorbing Cu 2 + , Pb 2 + and Cd 2 + ions from aqueous solutions and the NH 2 -MIL-88(Fe)-rGO/GCE could enhance the electrochemical responses of Cu 2 + , Pb 2 + and Cd 2 + effectively. Important operational parameters such as electrolyte pH and deposition time were investigated and optimized for the determination of trace Cu 2 + , Pb 2 + and Cd 2 + ions. Under the optimum conditions, the proposed electrochemical sensor had a linear range of 0.005––0.3 μM for Cd 2 + , 0.01–0.3 μM for Pb 2 + and 0.005–0.05 μM for Cu 2 + , respectively. The limits of detection (LODs) are 4.9 nM for Cd 2 + , 10 nM for Pb 2 + and 3.6 nM for Cu 2 + , respectively. The proposed method has been successfully applied to determine three metal ions in water samples. The developed sensor promises simple preparation, fast operation, good sensitivity and excellent reusability, showing great potential for monitoring of water quality.
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JOURNAL OF SOLID STATE CHEMISTRY
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2017
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IF 2.299
Zhen Ge,Xin Li,Wenguo Zhang,Qili Sun,Chunpeng Chai,Yunjun Luo
In this paper, the ultrafine Fe-O compound/ammonium perchlorate (AP) nanocomposites were prepared via in-suit growth method. The structure and morphology of the nanocomposites were characterized by infrared spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion X-ray spectrometer (EDS) and transmission electron microscopy (TEM) test. The results showed that the prepared Fe-O compound nanoparticles were amorphous state and deduced as 2L-ferrihydrite. The size of Fe-O compound/AP nanocomposites could be effectively controlled by changing the recrystallization condition. 2L-ferrihydrite nanoparticles was evenly dispersed in the nanocomposites proved by EDS and TEM analysis. Furthermore, the thermal decomposition of Fe-O compound/AP nanocomposites was analysized by TG-DSC method. The prepared 2L-ferrihydrite nanoparticles of the nanocomposites showed good catalytic effect on AP because of their decreasing the decomposition temperature and increasing the total heat release of AP.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
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IF 3.133
Yan Cheng,Yong Li,Guangbin Ji,Bin Quan,Xiaohui Liang,Zixin Zhao,Jieming Cao,Youwei Du
In this study, an extremely simple one-step ball milling has been applied to fabricate the flaky Fe 3 O 4 /Fe composites. The obtained samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). It is acknowledged that the ball-milling process has huge influence on the morphology and electromagnetic absorption capability. Compared with the raw Fe 3 O 4 , the saturation magnetization of Fe 3 O 4 /Fe composites improved greatly. When the thickness is just 1.25 mm, the reflection loss values below −10 dB can be achieved from 13.8 to 18 GHz, with a maximum reflection loss of −25.9 at 16.1 GHz. Obviously, the Fe 3 O 4 /Fe composites can be used as magnetic microwave absorbers due to its simple synthesis for the mass production standards. Moreover, this study also gives new enlightenment to design other magnetism/magnetism composites that can be applied to Ku-band such as satellite communications.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Chuanyu Chen,Simeng Xia,Fan Chen,Ting Peng,Lin Deng,Huiying Wu,Zhou Shi
The Fe(II)/peracetic acid (PAA) process shows significant potential for the removal of organic pollutants due to the rapid reaction between Fe(II) and PAA. However, the slow reduction from Fe(III) to Fe(II) leads to the continuous or excess dosing of Fe(II) during practical application. In this study, epigallocatechin gallate (EGCG), a typical reagent extracted from green tea, was used to enhance the degradation of coumarin (COU) by Fe(II)/PAA for the first time. A complete elimination of COU (25 μM) was achieved in the presence of 50 μM Fe(II), 300 μM PAA, and 25 μM EGCG, exhibiting a k obs value of 0.108 min −1 , which was 27 times higher than that observed with Fe(II)/PAA (0.004 min −1 ). Further, Fe(II)/EGCG/PAA demonstrated remarkable pH tolerance, with a COU removal efficiency exceeding 80 % across a pH range of 3–9. Mechanisms investigations revealed that •OH played a dominant role in COU degradation by Fe(II)/EGCG/PAA (accounting for 98.2 %). The increase in EGCG concentration from 10 to 100 μM resulted in a decreased formation of •OH yield and an enhanced generation of RO•. These findings highlight the capability of EGCG to improve the oxidation capacity of Fe(II)/PAA and modulate reactive species formation. The outstanding oxidation capacity and environmental friendliness of Fe(II)/EGCG/PAA process render it a potential strategy to eliminate organic pollutants in actual water treatment.
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Nano-Micro Letters
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2024
·Vol. 17
·期 1
·1-17
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IF 31.6
Chen Si,Huang Fang,Mao Lijie,Zhang Zhimin,Lin Han,Yan Qixin,Lu Xiangyu,Shi Jianlin
Fe single-atom catalysts (h 3 -FNCs) with high loading, high catalytic activity and high stability were synthesized via a method capable of increasing both the metal loading and mass-specific activity by exchanging zinc with iron.
The “density effect,” derived from the sufficiently high density of active sites, has been discovered for the first time, leading to a significant alteration in the intrinsic activity of single-atom metal sites.
The superior oxidase-like catalytic performance of h 3 -FNCs ensures highly effective bacterial eradication.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Jianguo Feng,Yifei Tan,Li Sun,Qianwei Liang,Tianzhen Jiang,Zhen Li
Traditional pesticide formulations have issues such as poor targeting, low adhesion performance, and a tendency to leach into the environment, causing pollution. In this study, a pesticide delivery platform (PRO@FeMOFs@CMC) with a dual response was designed by encapsulating prochloraz technical (PRO) within Fe-based metal–organic frameworks (FeMOFs) and using carboxymethyl cellulose (CMC) as the gatekeeper. The results showed that PRO@FeMOFs@CMC exhibited a loading capacity of 28.86 % for PRO and efficient adhesion to wheat and rice leaves. This delivery platform showed a significant increase in the release of PRO under environments similar to that produced by a pathogen infection, involving cellulase and glutathione (GSH). Importantly, compared to prochloraz suspension concentrate (PRO@SC), PRO@FeMOFs@CMC exhibited higher fungicidal efficacy against Rhizoctonia cereali and Rhizoctonia solani and its acute toxicity to zebrafish and earthworms was reduced by 3.7 times and 8.6 times, respectively. Compared to PRO@SC, the cells treated with PRO@FeMOFs@CMC had higher cell viability and a significantly reduced apoptosis rate, demonstrating greater safety. Additionally, FeMOFs@CMC showed no evident toxicity to wheat and rice. In summary, PRO@FeMOFs@CMC is an efficient and safe pesticide controlled-release system for the sustainable management of wheat and rice diseases.
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PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
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2024
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IF 4.4
Jingchuan Guo,Yan Gao,Xuankai Cao,Xing Rong,Shidan Chi,Guolan Fan,Lei Zhang,Guohong Tian,Xudong Zhao
Hydrogen energy has attracted widespread attention as a high-energy–density, sustainable and clean energy source. Hydrogen production by electrolysis of water is a simple and efficient method of hydrogen production. However, most of the currently widely used commercial catalysts are expensive precious metals and their oxides. Therefore, it is necessary to develop low-cost, efficient and stable catalysts to promote the development of the hydrogen energy industry. Metal organic framework (MOF), as a new type of porous, high surface area material, has great potential in catalysis. Bimetallic MOF materials can further improve the catalytic activity of MOF materials as electrocatalysts by adjusting metal sites. In this paper, different proportions of Fe-Co bimetallic MOF materials were synthesized by hydrothermal method, and the Fe-Co bimetallic carbon materials prepared by carbonization at high temperature were used as OER electrocatalyst, and the microstructure and electrochemical performance of the materials were analyzed and evaluated through microscopic mechanism characterization and electrochemical characterization. The test results show that Fe-Co bimetallic carbon materials have excellent electrocatalytic performance, Fe 2 Co/C and RuO 2 have the smallest high-frequency semicircles, and have the smallest internal charge transfer resistance. This indicates that Fe 2 Co/C has similar conductivity to RuO 2 . When the current density is 10 mA·cm −2 , Fe 2 Co/C has an overpotential of 335 mV, and when the current density is 50 mA·cm −2 , Fe 2 Co/C has an overpotential of 382 mV, and the oxygen evolution performance of Fe 2 Co/C is better than that of commercial precious metal catalyst RuO 2 at high current density. At the same time, its Tafel slope is only 58.8 mV·dec −1 , which is lower than that of RuO 2 catalyst, and it has a faster charge transfer rate. After CV cycles and 12 h of electrolysis by continuous chronoamperometry electrolysis, it exhibited excellent electrocatalytic stability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Shaojun Sun,Chunyan Zhang,Mingxin Ran,Yujie Zheng,Chuanhua Li,Yu Jiang,Xuemin Yan
Developing efficient, stable, and cost-effective catalysts is crucial for hydrogen production through electrolysis of water. In this study, a comprehensive work was conducted on the electrocatalytic hydrogen and oxygen evolution performance of nickel-based phosphides doped with metallic iron. The Ni 5 P 4 /Ni 2 P/Fe 2 P catalysts with heterostructure were synthesized via a simple two-step synthetic route: (i) NaBH 4 pretreatment and in situ hydrolysis, (ii) low-temperature phosphating. It was found that iron doping not only improves the dispersibility but also increases the valence state of nickel in phosphating products. The Ni 5 P 4 /Ni 2 P/Fe 2 P-2 catalyst prepared with a molar ratio of 3 between Ni and Fe exhibits the best performance for HER and OER. In detail, only 185 and 190 mV overpotentials in acidic and alkaline electrolytes are required when the current density of hydrogen production is 10 mA cm −1 , respectively. To achieve the same current density under alkaline conditions, an overpotential of 215 mV is required for oxygen evolution, which is superior to IrO 2 . This work would enlighten the construction of more advanced bifunctional catalysts (HER and OER) via metal Fe doping.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Meiling Wu,Yang Tao,Yuwei Liu,Sanying Hou,Tiyang Xiao,Qing Fu,Guowen Peng,Lang Shi
In this study, Fe/N co-doped graphene-like honeycomb porous carbon (Fe-NC)was produced and used for the activating PMS to degrade TC. The Fe-NC catalyst has shown high activity in the TC degradation by activated PMS, with an efficiency of up to 94 % in 30 min. while the blank catalyst without N and Fe doping exhibited the lowest performance with 47.3 % TC degradation. Moreover, other operational factors of Fe-NC catalysts were also investigated to evaluate its catalytic activity. The burst experiments and electron paramagnetic resonance (EPR) experiments demonstrated that free radical paths (O 2 ·- ) and non-free radical paths ( 1 O 2 ) coexist inside the Fe-NC/PMS system. The experiment results and degradation mechanism analysis revealed that N species(Pyridine N, Graphite N,Fe-N x ) and iron species (Fe0) were possible to be the active species of catalysts. Furthermore, Fe-NC/PMS system was investigated for possible pathway of TC degradation by liquid mass spectrometry (LC-MS), and the presence of intermediates was analyzed for toxicity magnitude by ECOSAR software.
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Materials Today Chemistry
·
2025
·
IF 6.7
Junyuan Zhang,Jingjing Chen,Yulu Jing,Xiaolong Xu,Changyu Liu,Jianbo Jia
A Fe, Co, N doping hierarchical carbon composite was prepared using stepwise pyrolysis. The prepared composite exhibited excellent oxygen reduction reaction (ORR) activity with a half-wave potential (E 1/2 ) of 0.88 V (vs. reversible hydrogen electrode, RHE), which was higher than the commercial 20 wt% Pt/C (E 1/2 = 0.83 V). The oxygen evolution reaction (OER) activity of the prepared catalysts with the potential at 10 mA cm −2 (E j10 ) of 1.543 V was lower than that of the commercial RuO 2 (E j10 = 1.586 V). The corresponding turnover frequency (TOF) of FeCo@NC-3N-900 was 0.076 O 2 s −1 at E 1/2 (TOF of Pt/C was 0.057 O 2 s −1 at E 1/2 ) in ORR and 0.056 O 2 s −1 at E j10 (TOF of RuO 2 was 0.001 O 2 s −1 at E j10 ) in OER. As a result, the performance of the Zn-air battery assembled with FeCo@NC-3N-900 was better than that of the commercial Pt/C + RuO 2 . At the same time, Co was found that can elevate the ORR activity of the prepared composites by improving the mass diffusion, and FeCo alloy elevate the OER activity by improving the electron transfer. This work provided an efficient method for the preparation of ORR/OER bifunctional catalyst.
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高影响因子
Carbon Letters
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2024
·
IF 5.5
Chen Jinghong,Xie Huan,Lin Yuyin,Tan Zhenxing,Zheng Mingchen,Yuan Yong,Zhou Lihua
Ibuprofen (IBU), a common pharmaceutical and personal care product (PPCP), is a pervasive water pollutant with adverse ecological and human health effects after transformation and accumulation. In this study, we synthesized Fe, N-doped carbon quantum dots (Fe, N-CQDs) using pig blood and FeCl 3 as a precursor via a one-step hydrothermal method. TEM, XRD, XPS, and UV–Vis were used to characterize the physical and chemical properties of Fe, N-CQDs. We investigated the feasibility of Fe, N-CQDs in activating peroxymonosulfate (PMS) for IBU degradation under visible light. The experimental results revealed that Fe in Fe, N-CQDs predominantly formed a stable complex through Fe–N and Fe-OH, with a high degree of graphitization and a sp 2 -hybridized graphitic phase conjugate structure. The Fe, N-CQDs/Light/PMS system exhibited strong activity, degrading over 87% of IBU, maintaining a wide pH range (3–10) adaptability. Notably, Fe, N-CQDs acted as visible-light catalysts, promoting Fe 3+ /Fe 2+ cycling and PMS activation, generating both free radicals (SO 4 •– , ·OH) and non-radicals ( 1 O 2 , h + ) to effectively degrade IBU. This study presents an innovative approach for the sustainable utilization of pig blood as a biomass precursor to synthesize Fe- and N-doped carbon materials. This study provides a new approach for the sustainable and value-added utilization of natural wastes and biomass precursors of Fe- and N-doped carbon materials, which can be used to treat pollutants in water while treating discarded pig blood. Graphical abstract
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Yong Xu,Shi Chen,Mingfu Ye,Mingyue Wang,Wenhai Wang,Konglin Wu
Levodopa (LDA) is a principal medication for the treatment of Parkinson’s disease, with its therapeutic efficacy and potential side effects being closely associated with administered dosages. Consequently, the development of sophisticated LDA detection methods is of significant importance. Herein, we present the successful fabrication of an innovative electrochemical sensor utilizing Fe/Fe 3 C nanoparticles supported on activated N-doped carbon spheres (Fe/Fe 3 C-ANC), which makes full use of the large specific area of ANC to accommodate more dispersive Fe/Fe 3 C NPs that exhibits outstanding electrocatalytic activity for LDA oxidation. The experimental findings demonstrate that Fe/Fe 3 C-ANC sensor can deliver wide linear response ranges (1–40 µM) with an impressively low limit of detection of 0.22 µM, surpassing the performance of most previously reported electrochemical sensors. Additionally, the good selectivity of Fe/Fe 3 C-ANC sensor was also proved through measuring a series of LDA structural analogues and potential interfering substances. Furthermore, its excellent selectivity was confirmed through the analysis of LDA structural analogs and potential interferents. The practical utility of the sensor was evaluated by detecting LDA in commercial tablets, spiked human serum and spiked artificial cerebrospinal fluid samples.
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