ENVIRONMENTAL RESEARCH
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2026
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IF 8.2
Zhiyan Hou,Siyu Jin,Liuqun Fan,Xiuling Yan,Seitkhan Azat,Jinxiong Wu,Xintai Su
Large amounts of oily sludge generated during petroleum production pose dual challenges, including severe environmental risks and the inefficient utilization of intrinsic functional elements. Herein, hierarchical porous carbon nanosheets derived from acid-pretreated oily sludge (denoted as HOS) are prepared through a three-step process involving acid pretreatment, controlled pyrolysis, and post-activation, without introducing any external iron or nitrogen precursors. Benefiting from precursor-level regulation of intrinsic iron and nitrogen species, the optimized sample (HOS-8) exhibits a two-dimensional nanosheet architecture, hierarchical porosity, a high specific surface area, and abundant Fe–N x active sites. These structural and chemical features collectively facilitate rapid ion/electron transport and efficient charge storage. As a result, HOS-8 delivers a high specific capacitance of 333 F g -1 , excellent rate capability with 79.4% capacitance retention at 10 A g -1 , and outstanding cycling stability with 95.5% retention after 10,000 cycles. A symmetric supercapacitor device assembled using HOS-8 achieves an energy density of 13.6 Wh kg -1 , outperforming many reported heteroatom-doped carbon electrodes. This work demonstrates a feasible strategy for converting iron- and nitrogen-containing oily sludge into functional carbon materials and provides insights into the rational design of waste-derived electrodes for energy storage applications.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2026
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IF 5.3
Lei Wang,Yue Huang,Jiawei Su,Haojie Su,Weihao Shen,Sanqing Huang,Xueqin Zhao
Ensuring food safety requires reliable methods to monitor toxic contaminants like p-aminophenol (p-AP), which can migrate from plastic packaging or accumulate as veterinary drug residues in food products. However, the absence of rapid and field-deployable detection methods poses a persistent obstacle to its effective monitoring. In this work, we developed iron-doped silicon quantum dots (Fe-SiQDs) as a robust peroxidase-mimicking nanozyme and engineered a dual-mode sensing platform for p-AP detection comprising a solution-based assay for laboratory use and a hydrogel strip for on-site smartphone-assisted quantification. The solution assay achieved high sensitivity (LOD: 5.22 μM) with excellent correlation to HPLC (R² = 0.9994), while the hydrogel strip enabled quantification within 15 min without complex instrumentation. The Fe-SiQDs-based hydrogel sensor was tested on real-world food matrices including honey and bottled water, achieving accurate recoveries between 93.2% and 119.5% with high reproducibility (RSD < 2.1%). This cost-effective and field-ready system provides a practical solution for rapid screening of p-AP in food samples, offering a useful tool for food safety monitoring.
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MICROCHEMICAL JOURNAL
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2026
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IF 5.2
Shu-Yu Wang,Yin-Hong Niu,Fang-Di Hu
A ratiometric colorimetric sensing platform was developed for nitrite detection, featuring a trimetallic metal-framework (MOF) nanozyme (Mn/Ni/Fe-MOF) synthesized via a facile one-pot solvothermal method. Comprehensive characterization revealed its successful fabrication and superior structural properties. The rational design of the trimetallic system creates a synergistic electron transfer network, endowing it with significantly enhanced peroxidase-like activity that surpasses its mono- (Fe-MOF) and bimetallic counterparts (Mn/Fe -MOF and Ni/Fe -MOF). This advancement leads to a low detection limit of 1.39 μM and a wide linear range of 2.0–150 μM for nitrite sensing, improving the sensitivity of nanozyme-based colorimetric method. Leveraging this high activity, Mn/Ni/Fe-MOF catalyzed H 2 O 2 -mediated oxidation of colorless 3,3′,5,5′-tetramethylbenzidine (TMB) to blue product (oxTMB). Subsequently, a robust ratiometric platform (A 450 /A 652 ) was constructed based on a specific diazotization reaction between nitrite and oxTMB, which induced a distinct color change and an absorbance shift. Unlike single-signal assays prone to fluctuations, this internal reference mechanism automatically corrects for common interferences, ensuring high accuracy and reliability in complex matrices, as evidenced by excellent recoveries (97.9%–102.3%) in real samples (tap water and sausage). The entire system is characterized by remarkable simplicity: the nanozyme is synthesized via a facile one-pot method, and the detection requires only a single-step addition of nitrite to the pre-formed oxTMB system under mild acidic condition. This streamlined, “mix-and-detect” protocol avoids complex modifications, multi-step reactions, or sophisticated instruments, offering practical advantages for potential on-site application. This work presents a reliable, high-performance sensing strategy and highlights the great potential of multi-metal MOF nanozymes in designing advanced sensors.
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ACS Sustainable Chemistry & Engineering
·
2026
·
IF 7.6
Mengqi Ding,Xinhong Zhao,Yanru Li,Xuefeng Long,Hongwei Li,Dong Ji,Guixian Li
Iron-based zeolites are promising catalysts for various selective oxidation reactions, yet conventional three-dimensional microporous zeolites suffer from significant mass-transfer limitations, which become particularly pronounced in liquid-phase catalytic systems. In this study, we optimized the synthesis strategy and successfully prepared highly crystalline two-dimensional Fe-PREFER zeolite from a silicon–iron precursor under fluoride-free conditions, reducing the crystallization time to 5 days, thereby improving both economic and environmental sustainability. Through comprehensive characterization techniques including XRD, SEM/TEM, UV–vis DRS, Raman, and EPR spectroscopy, it was confirmed that iron species are incorporated into the zeolite framework as isolated tetra-coordinated sites, which serve as the active centers for catalysis. By adopting a “structure-directing-agent-retained” strategy for catalytic evaluation, the detrimental effects of high-temperature treatment on active sites were avoided. The Fe80-PREFER catalyst exhibited excellent performance in phenol hydroxylation, achieving a phenol conversion of 52.9% and a dihydroxybenzene selectivity of 90.6% under mild conditions (50 °C, 3 h). Mechanistic studies revealed that the reaction proceeds via a hydroxyl-radical pathway, with surface-activated phenol species identified as the key intermediates. To address catalyst deactivation, an ethanol-washing regeneration method was developed. This room-temperature process, which consumes far less energy than conventional high-temperature calcination, effectively removes surface phenolic tar while preserving the zeolite framework structure and the stability of the active iron species, leading to full recovery of catalytic performance. The synthesis and regeneration strategies established for this two-dimensional Fe-PREFER zeolite can be extended to other liquid-phase oxidation systems involving small molecules, such as low-temperature methane oxidation and aromatic hydroxylation.
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ACTA MATERIALIA
·
2026
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IF 10.7
Yucheng Lv,Yao Di,Linlin Zhou,Hui Xu,Xinmei Hou,Yanglong Hou
The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are central to renewable energy technologies, yet their sluggish kinetics and reliance on scarce noble-metal catalysts hinder large-scale implementation. Here, we demonstrate that sulfur (S) -mediated spin-state engineering of single-atom Fe catalysts establishes a direct structure-spin-activity relationship for bifunctional oxygen electrocatalysis. Optimal S coordination shifts the Fe centers to a high-spin configuration within a porous hollow carbon architecture. This spin-state modulation optimizes the adsorption energetics of oxygen intermediates, lowering kinetic barriers for both ORR and OER. FeS 2 NC-h exhibits outstanding OER and ORR activity in alkaline media, achieving a low potential gap (ΔE) of 0.63 V, markedly outperforming the commercial Pt/C+IrO 2 (0.79 V). In rechargeable Zn-air batteries (RZABs), FeS 2 NC-h enables an open-circuit voltage of 1.50 V, peak power density of 202 mW cm −2 , specific capacity of 812 mAh g Zn −1 , and exceptional cycling durability exceeding 1200 h with round-trip efficiency >58%. This work establishes heteroatom-enabled spin-state engineering as a powerful strategy to transcend traditional coordination optimization, offering a general pathway to noble-metal-free integrated oxygen electrocatalysts for sustainable energy conversion and storage. Download: Download high-res image (302KB) Download: Download full-size image
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DIAMOND AND RELATED MATERIALS
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2026
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IF 5.1
Jingwen Zhong,Lini Huo,Haiyi Zhong,Peiyuan Li
The rapid and on-site detection of 4-nitrophenol (4-NP), a refractory and highly toxic environmental pollutant, remains a significant challenge. In this study, iron-doped carbon dots (Fe-CDs) were synthesized via a facile one-pot hydrothermal method using a natural herbal precursor, Citri Reticulatae Pericarpium, as the carbon source. Comprehensive characterization revealed that the Fe-CDs are uniform quasi-spherical nanoparticles with hydrophilic surfaces rich in functional groups such as hydroxyl and carboxyl. This structure endows them with dual functionality: strong intrinsic fluorescence and excellent peroxidase-like activity at neutral pH. Leveraging these properties, we constructed a dual-mode (fluorescence/colorimetric) sensing platform integrated with smartphone-based colorimetric analysis for the rapid, on-site detection of 4-NP. The platform exhibited high sensitivity with a detection limit of 0.17 μM, excellent selectivity against common interferents, and reliable performance in real water samples with satisfactory recovery rates (95.45–107.38 %). Furthermore, the intrinsic Fenton-like activity of the Fe-CDs enabled the oxidative degradation of 4-NP This work presents a sustainable and efficient strategy for environmental monitoring and remediation, highlighting the great potential of herb-derived carbon-based nanozymes in portable sensing applications.
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IONICS
·
2021
·Vol. 27
·期 8
·3663-3669
·
IF 2.817
Xiang Tong,Chen Zhi,Rao Zhixin,Yan Mingge,Feng Zhijun,Li Xibao,Yang Huiyong,Huang Juntong,Shen Xing
Iron carbide (Fe 3 C) has gained significant attention for use in energy storage applications. Furthermore, using a nano-scale metal as the catalyst can reduce the formation of a solid electrolyte interface (SEI), thus enhancing capacity. For these reasons, hierarchical Fe/Fe 3 C/C nanofibers are prepared by electrospinning with subsequent thermal treatment and used as the anodes for lithium ion batteries (LIBs). These anodes demonstrate a good rate and high capacities. At 0.1 A g −1 , the Fe/Fe 3 C/C nanofiber electrode maintains 518 mA h g −1 after 100 cycles. When tested at 1 A g −1 , the discharge capacity gradually increases and reaches 663 mA h g −1 after 1200 cycles. This work demonstrates the possibility to design and develop transition metal carbides (TMCs) for use in energy storage.
研究领域:
材料科学
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储能技术
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纳米技术
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电化学
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Nature Communications
·
2022
·Vol. 13
·期 1
·1-9
·
IF 17.694
Zhang Xiaoran,Zhu Xiaorong,Bo Shuowen,Chen Chen,Qiu Mengyi,Wei Xiaoxiao,He Nihan,Xie Chao,Chen Wei,Zheng Jianyun,Chen Pinsong,Jiang San Ping,Li Yafei,Liu Qinghua,Wang Shuangyin
Electrocatalytic urea synthesis emerged as the promising alternative of Haber–Bosch process and industrial urea synthetic protocol. Here, we report that a diatomic catalyst with bonded Fe–Ni pairs can significantly improve the efficiency of electrochemical urea synthesis. Compared with isolated diatomic and single-atom catalysts, the bonded Fe–Ni pairs act as the efficient sites for coordinated adsorption and activation of multiple reactants, enhancing the crucial C–N coupling thermodynamically and kinetically. The performance for urea synthesis up to an order of magnitude higher than those of single-atom and isolated diatomic electrocatalysts, a high urea yield rate of 20.2 mmol h −1 g −1 with corresponding Faradaic efficiency of 17.8% has been successfully achieved. A total Faradaic efficiency of about 100% for the formation of value-added urea, CO, and NH 3 was realized. This work presents an insight into synergistic catalysis towards sustainable urea synthesis via identifying and tailoring the atomic site configurations.
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JOURNAL OF RARE EARTHS
·
2023
·
IF 4.9
Bolang Li,Fei Wang,Kai Li,Ping Ning,Min Chen,Changbin Zhang
The chemical transformation of CO 2 produces carbon compounds that can be used as precursors for the production of chemicals and fuels. Here, we investigated the activity and selectivity of the transition metals (Fe, Co, and Ni) supported on CeO 2 catalyst for CO 2 hydrogenation at atmospheric pressure. We found that Ni/CeO 2 shows the highest CO 2 conversion compared with Fe/CeO 2 and Co/CeO 2 . Besides, Co/CeO 2 and Ni/CeO 2 exhibit nearly 100% CH 4 selectivity while Fe/CeO 2 inclines to produce CO. The characterization results show that the metal-support interaction order is Fe/CeO 2 > Co/CeO 2 > Ni/CeO 2 , the weak metal-support interaction over Ni/CeO 2 benefits the activation of H 2 and then promotes the activity of CO 2 hydrogenation. Additionally, in situ DRIFTS results demonstrate that monodentate formate species rather than bidentate formate are the active intermediates. The main route of CO 2 hydrogenation to CH 4 is that CO 2 is firstly transformed to m-HCOO∗ and then direct hydrogenation of the m-HCOO∗ to CH 4 . This study provides insights into the understanding of the mechanisms of CO 2 hydrogenation on CeO 2 based catalysts.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Chunyang Lu,Yangqin Gao,Wei An,Chengcheng Yan,Fengshan Yu,Wenyi Lu,Chunxia Wang,Guoyong Huang
Distinct from the traditional synthesis of NiCo 2 O 4 nanoflowers from hydrothermal approach. Herein a facile gas-liquid diffusion method was exploited to prepare NiCo 2 O 4 and Fe-doped NiCo 2 O 4 nanoflower under ambient condition for oxygen evolution reaction (OER). The remarkable nanoflowers was generated by diffusing ammonia to the homogeneous solution of cobalt and nickel sulfate salt with slight amount of Fe sulfate salt to form a heterogeneous precipitation, followed by pyrolysis to afford the final product of NiCo 2 O 4 or Fe-doped NiCo 2 O 4 . The remarkable feature of NiCo 2 O 4 displays a spherical nanoflower morphology composed of lamellar structure with excellent dispersibility and greatly prompt the electron transfer and enable a high activity. By varying the ratio of Ni to Fe to 9:1, a superior OER performance with overpotential of 256 mV and Tafel slope of 69 mV·dec −1 at 10 mA·cm −2 was obtained. We attribute the superior performance to the excellent gas and ion transport channels due to the unique nanoflower structure as well as the well optimized electronic structure derived from Fe doping. Besides, we tentatively propose a detailed formation process for the formation of this nanoflower structure based on co-precipitation reaction. In conclusion, this approach offers a facile and efficient way for the preparation of high-performance ternary mixed metal oxides nanostructure which enable its large-scale production of OER catalyst.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Shujuan Lv,Ying Deng,Qian Liu,Ziqi Fu,Xiaobin Liu,Minghui Wang,Zhenyu Xiao,Bin Li,Lei Wang
The hollow materials with open structure can accelerate the mass transfer and bubble release rate, which have attracted tremendous attention for electrocatalytic water splitting. In this work, a unique tri-metal phosphide open nanotube structure [FeCoNiP@carbon quantum dots, FCNP@CQDs] is firstly fabricated by a selected etching and phosphating process with a MIL-88A@CQDs (MIL stands for Material of Institute Lavoisier) as the precursor. Benefiting from their open structure, FCNP@CQDs exhibit excellent catalytic performance. In alkaline seawater solution, a low overpotential of 268 mV is required to reach 20 mA cm −2 current density for oxygen evolution reaction, while the η 20 of hydrogen evolution reaction is 150 mV. The FCNP@CQDs//FCNP@CQDs electrolyzer requires a voltage of 1.61 V to reach 10 mA cm −2 . The integrated strategy of CQDs-doping and construction of hollow open structures may open a new and relatively unexplored path for fabricating high-performance seawater splitting catalysis.
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Materials
·
2023
·Vol. 16
·期 4
·1544
·
IF 3.4
Angxuan Wu,Yuchen Zhu,Chen Xu,Nianping Yan,Xuetong Zhao,Xilin Wang,Zhidong Jia
Arc floating in surface flashover can be controlled by reducing the interfacial charge-transfer resistance of ceramics. However, thus far, only a few studies have been conducted on methods of treating ceramic surfaces directly to reduce the interfacial charge-transfer resistance. Herein, we explore the flash sintering behavior of a ceramic surface (3 mol% yttria-stabilized zirconia (3YSZ)) onto which loose metal (iron) powder was spread prior to flash sintering at room temperature (25 °C). The iron powder acts as a conductive phase that accelerates the start of flash sintering while also doping the ceramic phase during the sintering process. Notably, the iron powder substantially reduces the transition time from the arc stage to the flash stage from 13.50 to 8.22 s. The surface temperature (~1600 °C) of the ceramic substrate is sufficiently high to melt the iron powder. The molten metal then reacts with the ceramic surface, causing iron ions to substitute Zr4+ions and promoting rapid densification. The YSZ grains in the metal-infiltrated area grow exceptionally fast. The results demonstrate that spreading metal powder onto a ceramic surface prior to flash sintering can enable the metal to enter the ceramic pores, which will be of significance in developing and enhancing ceramic–metal powder processing techniques.Keywords:flash sintering;room temperature;YSZ;metal powders;arc
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