JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2026
·Vol. 101
·期 6
·1263-1272
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IF 2.7
Zahid Iqbal,Jia-Yao Gao,Meng-Meng Wang,Wen-Fang Cai,Yun-Hai Wang
BACKGROUND The environmental persistence and resistance-promoting potential of tetracycline demands an efficient catalytic system capable of its complete oxidation. Herein, a bamboo derived Fe-N co-doped activated biochar (designated as Fe-N/C-A-2P) was engineered by two-step synthesis strategy to activate H 2 O 2 in a heterogeneous Fenton system for efficient tetracycline (TC) degradation. RESULTS The catalyst under optimized conditions (catalyst dosage = 0.5 g L −1 , pH = 3, H 2 O 2 concentration = 300 mg L −1 , temperature = 25 °C, and TC = 70 mg L −1 ) achieved about 90% TC removal within 60 min. It exhibited significantly enhanced reaction kinetics and sustained performance over multiple cycles with minimal iron leaching, indicating strong Fe retention and preserved stability. Radical quenching analysis confirmed a dual oxidative route, involving both radical (·OH and O 2 · − ) and non-radical ( 1 O 2 ) mechanism for TC degradation. The catalyst displayed strong resistance to common inorganic anions and humic substances, highlighting its applicability beyond idealized conditions. CONCLUSION These findings demonstrate that Fe-N/C-A-2P catalyst serves as an efficient heterogeneous Fenton catalyst for removal of TC, providing a feasible approach for mitigating antibiotic contamination in aqueous media. © 2026 Society of Chemical Industry (SCI).
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JOURNAL OF MATERIALS SCIENCE
·
2026
·
IF 4.4
Guo Shiquan,Wang Le,Chen Fei,Liu Wei,Li Congju
Pt-based electrocatalysts are recognized as the most effective materials for the oxygen reduction reaction (ORR) in fuel cells. However, their widespread application is hindered by high cost, insufficient stability, and susceptibility to methanol and CO poisoning. Therefore, it is crucial to develop non-precious metal catalysts that are efficient, durable, and tolerant to fuel crossover. Herein, we report a facile synthesis of Fe–N–C catalysts derived from transition metal-doped zeolitic imidazolate frameworks via thermal treatment. In alkaline electrolyte, the obtained catalyst exhibited a half-wave potential of 0.79 V (vs. RHE) for the ORR, only 10 mV lower than that of commercial Pt/C. Moreover, it demonstrated excellent stability with 86.7% current retention after 35,000 s, along with outstanding methanol tolerance. In addition, no significant change in current response was observed upon the addition of 1 M methanol during linear sweep voltammetry. Notably, a direct methanol fuel cell incorporating the Fe–N–C catalyst delivered a peak power density of 13.3 mW cm −2 at 65 ℃. This work highlights the critical role of Fe single atoms in enhancing both ORR activity and methanol tolerance, underscoring the significance in advancing the development of high-performance electrocatalysts for fuel cell applications. Graphical abstract
The alternative text for this image may have been generated using AI.
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Wendong Liu,Lin Chu,Chenghui Zhang,Pengjuan Ni,Yuanyuan Jiang,Bo Wang,Yizhong Lu,Chuanxia Chen
Revealing the relationship between composition and enzyme-like activities is essential for the rational designs of nanozymes and related assays with improved performances. Here, a series of Fe-N co-doped porous carbon (Fe-N-C) nanozymes containing different Fe contents have been successfully prepared by facilely pyrolyzing hemin trapped zeolitic-imidazolate-frameworks (Hemin@ZIF-8). The special doping agent hemin will endow Fe-N-C with exceptionally high peroxidase-mimetic activities due to the hierarchically porous structure, high specific surface area, and high dispersed Fe-N x sites. Notably, the optimal Fe 55 -N-C nanozymes are used to detect bio-enzymes, by taking alkaline phosphatase (ALP) as a model, based on the inhibition of nanozymatic activity by ascorbic acid (AA). A linear activity range of 0.05–20 U/L is obtained with a low detection limit of 0.03 U/L, which is superior to the most published optical ALP assays. This work provides not only a new method for the design of the transition metal-N-C nanozyme with enhanced peroxidase-like activity but also a promising strategy for the detection of ascorbic acid-generating bio-enzymes with the assistance of specific substrates.
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Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-14
·
IF 3.578
Guo Chaozhong,Li Yanrong,Li Zhaoxu,Liu Yao,Si Yujun,Luo Zhongli
Designing appropriate methods to effectively enhance nitrogen-doping efficiency and active-site density is essential to boost the oxygen reduction reaction (ORR) activity of non-platinum Fe/N/C-type electrocatalysts. Here, we propose a facile and effective strategy to design a mesopore-structured Fe/N/C catalyst for the ORR with ultrahigh BET surface area and outstanding conductivity via nanochannels of molecular sieve-confined pyrolysis of Fe 2+ ions coordinated with 2,4,6-tri(2-pyridyl)-1,3,5-triazine complexes as a novel precursor with the stable coordination effect. Combining the nanochannel-confined effect with the stable coordination effect can synergistically improve the thermal stability and stabilize the nitrogen-enriched active sites, and help to control the loss of active N atoms during pyrolysis process and to further obtain a high active-site density for enhancing the ORR activity. The as-prepared Fe/N/C electrocatalyst has exhibited excellent catalytic activity with an onset potential of ~ 0.841 V (versus RHE) closely approaching the Pt/C catalyst and high long-term stability in alkaline electrolyte. Besides, low-hydrogen peroxide yield (< 6.5%) and high electron transfer number (3.88–3.94) can be found on this catalyst, indicating that it is a valuable substitute for traditional Pt/C catalysts. This work paves a new way to design high-performance Fe/N/C electrocatalysts and deepens the understanding of active site and ORR catalysis mechanism.
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Journal of Environmental Chemical Engineering
·
2022
·
IF 7.968
Haoyang Wu,Zhilong Tan,Bin Miao,Hailong Hu,Sanying Hou
In this work, Fe, N co-doped hierarchical porous graphite-like carbon with carbon-encapsulated Fe/Fe 3 C@ Fe-N-C was synthesized by a facile solid-phase synthesis strategy, and was employed as an efficient catalyst to activate peroxymonosulfate (PMS) for oxidation of tetracycline (TC). The optimal Fe-N/C 800 outlined a highly catalytic performance in activating peroxymonosulfate (PMS) with TC decomposition rate reaching 89.2 % in 20 min at ultra-low catalyst dosage. Meanwhile, the effect of operating parameters was also investigated in order to evaluate the potential of using Fe-N/C 800 in practical applications. In addition, the characterization analysis and experiments results elucidated that graphitic N, pyridinic N, C O, Fe 3 C, Fe 0 and FeN 4 were considered as the main reactive species promoting the PMS activation to generate reactive oxygen species (ROS) (including singlet oxygen ( 1 O 2 ), sulfate radical (SO 4 •- ) and hydroxyl radical (•OH)). The electron paramagnetic resonance (EPR) experiments and radicals quenching analyses further demonstrated that the non-radical species singlet oxygen ( 1 O 2 ) was the dominant reactive oxygen species. Moreover, the TC degradation pathways were presented by LC-MS. Ultimately, the toxicity of the intermediate products were also investigated by ECOSAR system.
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Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 23
·5557-5564
·
IF 5.6
Yi Sheng,Hongmei Zheng,Jingting Hou,Wanying Zhang,Hong Chen,Luanjie Nie,Jing Zheng,Qingxue Lai
Fe–N–C materials as popular non-Pt group metal (non-PGM) electrocatalysts demonstrated huge potential for replacing Pt-based materials for efficient oxygen reduction reaction (ORR) electrocatalysis in acidic media. Herein, a metal–organic-framework (MOF)-based dual ligand strategy is proposed to develop advanced Fe–N–C materials with a controllable density of Fe-Nx sites and electrochemically active surface area, attributed to the synergistic effect from secondary ligand manipulation and Zn evaporation during pyrolysis. As a result, the optimized catalyst exhibits an ORR half-wave potential of 0.747 V vs. RHE and long-term stability with only a 29 mV negative shift after 3000 potential cycles in 0.5 M H2SO4 electrolyte. More far-reaching, this MOF-based dual ligand strategy opens a novel avenue to the precise fabrication of efficient catalysts.
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ENVIRONMENTAL RESEARCH
·
2023
·
IF 8.3
Chuanhui Geng,Qingguo Chen,Zhenzhen Li,Mei Liu,Zhi Chen,Hengcong Tao,Qiao Yang,Baikang Zhu,Lijuan Feng
In this study, we investigated the doping of Fe–N–C with ZnO (Fe–N–C@ZnO) to enhance its performance in the reduction of biological toxicity and degradation of enrofloxacin (ENR) in seawater. The steady-state/transient fluorescence analysis and free radical quenching test indicated an extremely low electron–hole recombination rate and the generation of reactive oxygen species in Fe–N–C@ZnO, leading to an improvement in the energy efficiency. We compared the ENR degradation efficiencies of Fe–N–C@ZnO and ZnO using both freshwater and seawater. In freshwater, Fe–N–C@ZnO exhibited a slightly higher degradation efficiency (95.00%) than ZnO (90.30%). However, the performance of Fe–N–C@ZnO was significantly improved in seawater compared to that of ZnO. The ENR degradation efficiency of Fe–N–C@ZnO (58.87%) in seawater was 68.39% higher than that of ZnO (34.96%). Furthermore, the reaction rate constant for ENR degradation by Fe–N–C@ZnO in seawater (7.31 × 10 −3 min −1 ) was more than twice that of ZnO (3.58 × 10 −3 min −1 ). Response surface analysis showed that the optimal reaction conditions were a pH of 7.42, a photocatalyst amount of 1.26 g L −1 , and an initial ENR concentration of 6.56 mg L −1 . Fe–N–C@ZnO prepared at a hydrothermal temperature of 128 °C and heating temperature of 300 °C exhibited the optimal performance for the photocatalytic degradation of ENR. Based on liquid chromatography–mass spectrometry analysis, the degradation processes of ENR were proposed as three pathways: two piperazine routes and one quinolone route.
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MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Hong Yu,Chen Wang,Xinhe Xiong,Bitao Dai,Yang Wang,Zhijie Feng,Hao luo,Jiangxiong Zhu,Guoqing Shen,Yun Deng,Xueqing Geng,Danfeng Wang,Lumei Wang
Acetamiprid (Ace), extensively employed in agricultural production as a substitute for organophosphorus pesticides, poses a potential threat to the environment and human health due to excessive residues. Hence, the development of reliable and convenient techniques to determine Ace levels in the environment holds significant importance. Among various assay methods, nanomaterial-based aptamer-based biosensors (aptasensors) have emerged as efficient and promising tools. In this study, we successfully developed a novel aptasensor for monitoring Ace in the environmental water, utilizing advanced nanomaterials known as Fe-N-C single-atom nanozymes (SAzymes). Fe-N-C SAzymes exhibited excellent catalytic activity, high stability, and complete atom utilization. A facile dual-confinement route was employed for the synthesis of Fe-N-C SAzymes, and their performance as oxidase-like nanozymes was investigated. The synthesized Fe-N-C SAzymes presented distinct oxidase-like activity and demonstrated the capability to interact with a chromogenic indicator-TMB, serving as the signal transduction element in our assay. Furthermore, we found that thiol-modified aptamers could effectively dampen the oxidase-like activity of Fe-N-C SAzymes.Therefore, we successfully developed a Fe-N-C SAzymes assisted detection method for Ace, which exhibited high sensitivity (LOD = 16.9 nM) and selectivity. Overall, this work provides new insights into the design of multifunctional Fe-N-C SAzymes for environmental and biological applications.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yaqian Dong,Zhi Fang,Deliu Ou,Qing Shi,Yu Ma,Weiyou Yang,Bin Tang,Qiao Liu
Constructing inexpensive, efficient, and stable pH-universal oxygen reduction electrocatalysts with controlled distribution of active species is of great importance for the exploration of green energy conversion devices. Herein, we demonstrated the rational preparation of S-modified Fe–N–C nanosheet catalysts with hierarchical porous architecture, large specific surface area (up to 1471 m 2 g −1 ) and controlled S doping (up to 12.3 at.%) by the co-pyrolysis of cysteine, FeCl 3 with Zn-mediated MgO template. Merited from rich and accessible active sites, the catalysts display outstanding oxygen reduction reaction (ORR) activity in terms of very small E j3 (potential@3 mA cm −2 , 0.87 V in 0.1 M KOH, 0.66 V in 0.1 M PBS (pH7.4) and 0.64 V in 0.5 M H 2 SO 4 ) and overwhelming diffusion-limited current density (9.8, 6.1, 10.3 mA cm −2 in alkaline, neutral, acidic media, respectively), along with extremely respectable stability (∼90% activity retention for 53200, 26728, 43200 s in alkaline, neutral, acidic media, respectively), which underscore comparable or even better overall performance than commercial Pt/C and advanced pH-universal ORR catalysts ever reported. The as-assembled primary alkaline zinc–air battery delivers considerately large peak power density of 205 mW cm −2 and energy density up to 990.6 Wh kg Zn −1 at 10 mA cm −2 (115 mW cm −2 and 676.7 Wh kg Zn −1 for Pt/C-based battery), implying its highly promising application in practical energy conversion devices.
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Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yunpeng Zha,Xiaoxiao Sun,Zhengjun Xiong,Dandan Dong,Shili Li,Qinqin Wang,Minmin Liu
The porous carbon materials co-coordinated with Fe and N (Fe-N-C) were successfully synthesized through one-step pyrolysis with the zeolitic imidazolate framework (ZIF-8) as the precursor. Through systematic optimization of iron ion concentration during synthesis, the Fe-N-C-20 specimen exhibited optimal adsorption performance toward dibenzothiophene (DBT), demonstrating a maximum sulfur adsorption capacity of 22.14 mg S/g with a corresponding removal efficiency of 92 %. This superior performance can be primarily ascribed to the formation of Fe-S bonds anchored on Fe-N active sites, N-S interactions mediated by graphitic nitrogen species and appropriate pore size that allows access to thiophenic compounds. Furthermore, the experimental adsorption isotherms for DBT exhibited strong correlation with the Density Functional Theory (DFT) calculation. Additionally, the material's adsorption process followed pseudo-second-order kinetics and Langmuir isotherms of Fe-N-C, and the pseudo-second-order model shows the smallest RMSE (0.66), extremely low SSE (3.03) and AIC (-1.86), which further proves its excellent fitting ability. And the best balance between parameter efficiency and fitting performance. The high stability and recyclability of ZIF-derived Fe-N-C porous adsorbents contribute to sustainable industrial practices.
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Advanced Composites and Hybrid Materials
·
2025
·Vol. 8
·期 4
·1-12
·
IF 21.8
Wang Lijuan,Shi Yaqin,Wang Yuan,Jia Chunijang,Hou Jie,Su Yizhen,Xu Ben Bin,Liao Zhijian,Zhu Linhua
Synergistic effect between M-N X sites and M X O Y particles in hierarchical porous M–N-C catalysts holds great promises in boosting oxygen reduction reaction (ORR). In this work, 1,4-dicyanobenzene was utilized as a molecular template to prepare the hierarchical porous Fe–N-C catalysts with size-tunable Fe 3 O 4 particles for enhanced ORR in Zn-air battery. The as-prepared Fe 3 O 4 #Fe–N/C DB0.1 owned a half-potential of 0.90 V vs RHE, exceeding that of commercial 20%Pt/C (E 1/2 = 0.82 V vs RHE), showing a maximum power density of 321 mW cm −2 in a homemade Zn-air battery. Density functional theory (DFT) calculations indicate that the electronic interaction between Fe 3 O 4 and Fe-N 4 sites enhances the adsorption energy of *OOH, effectively optimizing the energy barrier for *O formation, significantly reducing the limiting energy barrier. Such superior ORR activity in Fe 3 O 4 #Fe–N/C originated from the optimized hierarchical pores and synergistic effect between Fe-N X sites and Fe 3 O 4 particles. This work provides a new and facile template strategy for engineering hierarchical porous carbon-based materials to achieve highly efficient catalytic reactions.
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ADVANCED MATERIALS
·
2024
·
IF 27.4
Huiwen Zhang,Hsiao-Chien Chen,Solmaz Feizpoor,Linfeng Li,Xia Zhang,Xuefei Xu,Zechao Zhuang,Zhishan Li,Wenyu Hu,Rony Snyders,Dingsheng Wang,Chundong Wang
The interaction between oxygen species and metal sites of various orbitals exhibits intimate correlation with the oxygen reduction reaction (ORR) kinetics. Herein, a new approach for boosting the inherent ORR activity of atomically dispersed Fe−N−C matrix is represented by implanting Fe atomic clusters nearby. The as-prepared catalyst delivers excellent ORR activity with half-wave potentials of 0.78 and 0.90 V in acidic and alkaline solutions, respectively. The decent ORR activity can also be validated from the high-performance rechargeable Zn–air battery. The experiments and density functional theory calculations reveal that the electron spin-state of monodispersed Fe active sites is transferred from the low spin (LS, t 2g 6 e g 0 ) to the medium spin (MS, t 2g 5 e g 1 ) due to the involvement of Fe atomic clusters, leading to the spin electron filling in σ∗ orbit, by which it favors OH − desorption and in turn boosts the reaction kinetics of the rate-determining step. This work paves a solid way for rational design of high-performance Fe-based single atom catalysts through spin manipulation.
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