FOOD CHEMISTRY
·
2024
·
IF 8.5
Peng Sun,Mingzhao Shang,Ruyan Xie,Yu Gao,Miaomiao Tian,Qijun Dai,Fang Zhang,Fang Chai
Determination of dopamine (DA) is crucial for its intimate relationship with clinical trials and biological environment. Herein, Fe, N co-doped carbon dots (AFC-CDs) were fabricated by optimizing precursors and reaction conditions for fluorimetric/colorimetric dual-mode sensing of DA. With synergistic influence of Förster resonance energy transfer and static quenching effect, DA significantly quenched the blue luminescence of AFC-CDs at 442 nm, the production of recognizable tan-brown complex caused evident colorimetric response, achieved the dual-mode fluorimetric/colorimetric sensing for DA. The excellent selectivity and satisfied sensitivity can be confirmed with the limit of detection at 0.29 μM and 2.31 μM via fluorimetric/colorimetric mode respectively. The reliability and practicability were proved by recovery of 94.81–101.61% in real samples. Notably, the proposed electron transfer way between AFC-CDs and DA was hypothesized logically, indicated dual-mode probe provided a promising platform for the sensing of trace DA, and could be expanded in environment and food safety.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 7
·077512
·
IF 4.386
Wenhuang Xiao,Xiaolin Zhao,Luyin Lin,Jian Luo,Haipeng Yang
Sarcosine has been discovered as a better potential biomarker for Prostate cancer (PCa). Though many high-performance amperometric sarcosine biosensors have been reported, it is still difficult to accurately detect sarcosine because of the extremely low concentration and the presence of many electroactive interferents in human serum or urine. Since most of the reported sarcosine biosensors use platinum group metals (PGM) as catalysts, it is meaningful to explore other catalysts with higher catalytic activity. Metal-nitrogen-doped carbon (M–N–C) materials are considered as alternatives to precious metals. In this study, iron doped zeolitic-imidazolate-framework-8 (ZIF-8) composites were synthesized and calcined to obtain an Iron-nitrogen-doped Carbon (Fe–N–C) material, which has excellent catalytic activity. The sensitivity of the Fe–N–C modified sarcosine biosensor is 16.5 μA mM−1, (234.2 μA mM−1 cm−2), which is the highest one in recent reported works. It has a low limit of detection (LOD, 0.7 μM, S/N = 3), and an appropriate linear detection range of 2–37 μM. This work provides a new approach to prepare high performance sarcosine biosensors by improving the catalytic activity of the modifier of the sensor. It has great potential to be used as portable devices for the rapid detection of PCa.
研究领域:
医学
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生物化学
·
材料科学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Haipeng Cui,Song Hu,Tao Yang,Limo He,Kai Xu,Long Jiang,Sheng Su,Yi Wang,Jun Xu,Jun Xiang
This study explores the fabrication of Fe–N co-doped biochar (Fe–NAC) from waste balsa wood as an efficient catalyst for methane decomposition and as a precursor to functional carbon materials. Ferric nitrate and urea were used as the respective sources of iron and nitrogen. The Fe-NAC catalyst achieved 85 % methane conversion within 200 min at 800 °C, a 3.4-fold improvement over the parent biochar (AC). The stable biochar structure anchors Fe 3 N nanoparticles, forming a hierarchical porous catalyst that enhances performance. Theoretical calculations revealed that the Fe-N structure alters the electron distribution, facilitating efficient electron transfer from Fe sites to methane and intermediates, demonstrating a synergistic effect of heteroatoms and carbon supports. Additionally, Fe-NAC exhibited exceptional microwave absorption properties, achieving a minimum reflection loss (RL) of −42.48 dB at 14.96 GHz with a 4.67 GHz effective absorption bandwidth (EAB). Adjusting the thickness enabled coverage of the entire 4–18 GHz spectrum. Radar cross-section (RCS) simulations demonstrated superior microwave attenuation across a wide range of angles, surpassing other biochars. This study introduces a novel Fe-N biochar synthesis method, highlights its catalytic performance in hydrogen production, and demonstrates its potential in electromagnetic wave absorption, providing insights for green energy and functional material development.
研究领域:
材料科学
·
能源科学
·
环境科学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Meishuo Bao,Liang Zhang,Rongsheng Xiao,Xingang Wang,Zheqin Dai,Wuxiang Zhang,Jiansheng Li
The presence of resorcinol (RS) in water contaminated with pollutants may engender environmental and ecosystem risks. In this study, we developed rapid and efficient colorimetric methods for the on-site quantitative determination of RS. Specifically, a synthetic nanozyme composed of nitrogen-doped carbon-coated cobalt-iron (CoFe@CN) was utilized to initiate the oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) with the activator of peroxymonosulfate (PMS). Compared to the activator of hydrogen peroxide (H 2 O 2 ), PMS demonstrated a sixfold enhancement in catalytic efficacy, markedly elevating the detection performance. Density Functional Theory calculations indicate that RS can serve as a reducing agent for oxTMB, confirming the theoretical feasibility of this process. A linear relationship between inhibition rate (IR %) of RS concentration and absorbance was established and the colorimetric analysis revealed a linear relationship between RS concentration and gray scale values over the range of 0–45 μM, with a detection limit of 3.39 μM. Furthermore, smartphone-based analysis of color images allows for on-site quantitative analysis of RS concentration, leveraging portability and real-time detection capabilities. This study provides pioneering analytical support for on-site water quality monitoring within the ecological environment.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yingna Wang,Zilong Liu,Yuanpei Lan,Chaoyi Chen,Wei Zhang
The removal of small amounts of phenylacetylene from styrene is a crucial step in the production of high-quality styrene feedstocks. In the presence of a large amount of styrene and a small amount of phenylacetylene, achieving and maintaining high selectivity of styrene remains a significant challenge. In this work, a catalyst denoted as Pd 1.25 -Fe-N-C/VC was designed and synthesized with remarkably low Pd loading (the actual Pd content was 0.96 wt%). The catalyst exhibited a satisfactory selectivity for styrene (>95 %) and maintained high selectivity levels (>90 %) in the semi-hydrogenation of phenylacetylene even with prolonged reaction time. Pd nanoparticles (NPs) were well distributed and securely anchored onto the Fe-N-C/VC support with a hierarchical mesoporous structure, which obtained from the pyrolysis of a hexagonal star-like Fe-doped zeolitic imidazolate framework with vitamin C surfactant (Fe-doped ZIF/VC). The remarkable catalytic properties may be partly ascribed to the effective synergy effect of the uniformly well-dispersed Fe-N x (x represents the coordination number) with Pd active centers, which could modulate the adsorption kinetics of the reactant alkynes and alkenes and thus enhancing the selectivity towards styrene. Meanwhile, the hierarchical mesoporous structure is beneficial for the mass transfer, which can effectively promote the interactions between the reactants and active centers. Possible mechanism for the selective hydrogenation of phenylacetylene catalyzed by Pd 1.25 -Fe-N-C/VC was also illustrated. Moreover, the Pd 1.25 -Fe-N-C/VC catalyst exhibited sustained catalytic activity and selectivity even after four continuous cycle tests, showing notable reusability and stability. This work may offer a promising approach for creating highly efficient Pd-based catalysts with remarkably low Pd loading for phenylacetylene semi-hydrogenation.
研究领域:
化学工程
·
催化材料科学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Yanjie Niu,Qiqi Zhang,Li Wang,Fanhui Guo,Yixin Zhang,Jianjun Wu
Coal gasification fine slag (CGFS), as a difficult-to-dispose solid waste in the coal chemical industry, consists of minerals and residual carbon. Due to the aggregate structure of minerals blocking pores and encapsulating active substances, the high-value utilization of CGFS still remains a challenge. Based on the intrinsic characteristics of CGFS, this study synthesized Fe–N doped porous carbon/silicate composites (Fe-NC) by alkali activation and pyrolysis for electrocatalytic degradation of phenolic wastewater. Meanwhile, minerals were utilized to regulate the surface chemical and pore structure, turning their disadvantages into advantages, which caused a sharp increase in m -cresol mineralization. The positive effect of minerals on composite properties was investigated by characterization techniques, electrochemical analyses and density functional theory (DFT) calculations. It was found that the mesoporous structure of the mineral-regulated composites was further developed, with more carbon defects and reactive substances on its surface. Most importantly, silicate mediated iron conversion through strong interaction with H 2 O 2 , high work function gradient with electroactive iron, and excellent superoxide radical ( •O 2 − ) production capacity. It effectively improved the reversibility and kinetics of the entire electrocatalytic reaction. Within the Fe-NC 311 electrocatalytic system, the m -cresol removal rate reached 99.55 ± 1.24%, surpassing most reported Fe–N-doped electrocatalysts. In addition, the adsorption and electrooxidation experiment confirmed that the synergistic effect of Fe–N doped porous carbon and silicate simultaneously promoted the capture of pollutants and the transformation of electroactive molecules, and hence effectively shortened the diffusion path of short-lived radicals, which was further supported by molecular dynamics simulation. Therefore, this research provides new insights into the problem of mineral limitations and opens an innovative approach for CGFS recycling and environmental remediation.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Xingyu Zhong,Jianing Li,Weiyu Fang,Yuxuan Shen,Mei Bai,Xiulan Hu
The advancement of high-performance oxygen reduction reaction (ORR) catalysts is increasingly responsible for energy development. Iron and nitrogen co-doped carbon materials (Fe-N-C) have garnered extensive attention because of their catalytic activity, which is comparable to that of precious metal-containing catalysts. Nevertheless, the precursor ZIF-8 inevitably forms clusters during the conventional pyrolysis preparation procedure, leading to the coverage of Fe-N active sites and inhibiting catalytic performance. In this study, we induced ZIF-8 to deform into a unique interpenetration twin structure (ZIF-8-IT) by introducing the surfactant cetyltrimethylammonium bromide (CTAB), it has a concave-convex morphology with abundant facets that enhanced interfacial contactability, thereby reducing particle-to-particle interactions and alleviating agglomeration during pyrolysis. The Fe-N-C-IT catalyst prepared using ZIF-8-IT as a precursor exhibited exceptional ORR performance in alkaline media (E 1/2 = 0.898 V, E 0 = 0.983 V). Furthermore, the Fe-N-C-IT based coulomb electrolytic oxygen sensor demonstrated superior performance compared to Pt/C, it achieved an average response time of 66 s within the 100–1000 ppm oxygen concentration range, with only a 4.9 % current fluctuation observed after 28 days at a concentration of 500 ppm oxygen. This study presents a novel strategy for developing efficient oxygen reduction electrocatalysts through morphology engineering.
研究领域:
材料科学
·
电化学
·
传感器技术
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2019
·Vol. 30
·期 30
·305402
·
IF 3.399
Tong Wu,Yaying Li,Yuntong Li,Jing Hong,Haiyang Wu,Jie Mao,Yuzhe Wu,Qipeng Cai,Conghui Yuan,Lizong Dai
Simultaneous introduction of both transition metal and other inorganic elements into the carbon matrix has attracted great attention in the fabrication of carbon materials with high electrochemical properties. Herein, rational design of ligand-iron coordinative supramolecular precursors is achieved for the fabrication of Fe-N/C catalysts, which possess high oxygen reduction reaction (ORR) performance. A series of precursors are prepared by a simple coordination reaction between a three armed catechol monomer and iron ions. Particular interest is focused on tuning the doping species, surface area and morphology of the Fe-N/C catalysts through a simple selection of iron resources. We show that an Fe-N/C catalyst derived from Fe2(SO4)3 at a carbonization temperature of 800 °C, has the optimized ORR performance with an onset potential of 0.930 V and half-wave potential of 0.801 V. Detailed investigation indicates that the synergistic effect among doping elements of nitrogen and sulfur and the unique carbon structure determines the performance of the Fe-N/C catalysts. Our findings may be of significance for the fabrication of doped carbon materials using coordinative supramolecular polymers as precursors.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2022
·
IF 7.336
Hao Cheng,Hu Zhou,Yongyue Zhuang,Boyuan Chen,Junfeng Chen,Aihua Yuan
Exploring efficient and low-cost electrocatalysts for oxygen evolution reaction (OER) is of great importance for renewable energy-related systems. Prussian blue analogues (PBAs) are considered as promising precursors to derive advanced heteroatom-doped carbonaceous materials. However, the pyrolysis treatment usually results in an inevitable aggregation of active sites as well as the reduction of specific surface area, apart from the uncontrollable composition and morphology. Herein, we develop a straightforward synthetic protocol for fabricating highly-active OER electrocatalysts of Co 7 Fe 3 , Co, N-codoped carbon (Co 7 Fe 3 /Co@NC) by annealing trimetallic CoZnFe-PBA precursors. The surface modification of cobalt species over ZnFe-PBA effectively tailors the active composition for as-derived products, whereas Zn volatilization at a high temperature not only promotes the dispersion of active sites but also fabricates the formation of an intriguing hierarchical structure with multimodal porosity and high specific surface area. The integrated advantages of multinary composition and fabulous pore structure endow the elegantly-designed Co 7 Fe 3 /Co@NC with a remarkable catalytic performance towards OER in alkaline electrolyte, as evidenced by an overpotential of 290 mV without iR-correction at a current density of 10 mA cm −2 and impressive long-term durability. The present synthetic strategy offers valuable insights for developing highly-efficient PBAs-derived electrocatalysts with compositional multiplicity and interesting pore texture.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Wei Qian,Yi-Li Deng,Xiao-Long Liu,Hui Liu,Mao-You Ye,Ying-Ying Li,Yong-Zheng Zhang,Zeng-Hui Diao,Jia-Lin Liang
Recently, pollution caused by the extensive use of ofloxacin (OFX) antibiotics has had a profound impact on human health and environmental ecosystems. Herein, two types of biochar materials, namely cobalt‑nitrogen and iron‑nitrogen co-doped modified peanut shell biochar (Co-N-BC and Fe-N-BC, respectively), were synthesized using a hydrothermal pyrolysis method and then employed to activate persulfate (PS) for OFX degradation. The results showed that Co/Fe and N atoms were successfully loaded onto the surface and inside the biochar. Under optimal conditions, the degradation rate of OFX by Co-N-BC/PS was 93.99 %, whereas that of Fe-N-BC/PS reached 77.37 % within 120 min. After three cycles, the OFX degradation rate remained notably high, exceeding 60 % for both the Co-N-BC/PS and Fe-N-BC/PS samples. Hydroxyl radicals, sulfate radicals, and singlet oxygen were involved in both systems during OFX degradation. Four pathways for OFX degradation were proposed for the Co-N-BC/PS system, whereas the Fe-N-BC/PS system included three pathways. The Toxicity Evaluation Software Tool (T.E.S.T.) estimation showed that the toxicity of the OFX degradation intermediates decreased after treatment with Co-N-BC/PS and Fe-N-BC/PS. Overall, this study showed that these novel biochar catalysts can provide a new direction for the purification of wastewater laden with OFX antibiotics.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2014
·Vol. 3
·期 3
·1058-1067
·
IF 0
Xiangjie Bo,Mian Li,Ce Han,Yufan Zhang,Anaclet Nsabimana,Liping Guo
Iron and nitrogen-functionalized porous graphene (Fe/N/GR) was prepared using commercial ZnO as a template without surface modification of the template. Due to the high isoelectric point, the positively charged ZnO serves as a template for the adsorption of negatively-charged graphene oxide (GO). In the presence of the N precursor and Fe source, the pyrolysis of ZnO/GO and the subsequent removal of the Fe species and ZnO template produce porous Fe/N/GR. The increased distance between layers of porous Fe/N/GR and the large surface area effectively alleviate the aggregation of GR sheets and are favorable for the exposure of active sites for the oxygen reduction reaction (ORR). Many active sites of nonporous Fe/N/GR catalysts are secluded inside the aggregated GR sheets, while they are exposed at the surface of porous Fe/N/GR catalysts with a porous structure and large surface area. Porous Fe/N/GR may be further used as efficient and inexpensive noble metal-free ORR catalysts in both alkaline solutions and acidic solutions.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 9
·096518
·
IF 4.386
Xiangyu Meng,Zhihuan Wang,Guoliang Yu,Xinbin Wang,Yingjie Chen,Liyan Yu,Lifeng Dong
Rational design of surface plasmon-enhanced electrocatalysts can effectively integrate solar energy into fuel cells. Herein, iron and nitrogen codoped carbon (Fe/NC) nanoparticles synthesized with microemulsion are used to absorb and photo-reduce Ag ions in solutions to form Ag nanoparticles on Fe/NC (Ag-Fe/NC). Different Ag-Fe/NC materials are prepared by adjusting the concentration of AgNO3 solution. Among them, Ag-Fe/NC obtained with 0.5 mg ml−1 AgNO3 solution shows the highest oxygen reduction reaction (ORR) catalytic performance and light-enhanced ORR characteristics, even better than commercial Pt/C. Besides, Ag-Fe/NC displays excellent long-term stability and high methanol resistance for ORR performances in alkaline medium. Therefore, this study will provide a new method for integrating light to recover Ag ions in solutions and improve electrocatalytic properties.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）