TRANSITION METAL CHEMISTRY
·
2025
·
IF 1.7
Wang Yuqin,He Lizi,Han Ning,Li Lishuang,Wang Meiyang
It is of great practical significance to explore and prepare cheap, high-performance, and stable catalysts for oxygen reduction reaction (ORR), but it is still in progress at present. Herein, a straightforward evaporation–pyrolysis strategy is designed for the preparation of 3D porous electrocatalysts (denoted as \(\textrm{Fe}-\textrm{Co}-\textrm{NC}\) , which represented carbonization products at °C) made of carbon nanoparticles combined with metallic Fe-Co-doped N-enriched bridged carbon nanotube by carbonization of a pristine ZIF8 as highly efficient and durable ORR electrocatalysts. The obtained Fe–Co–NC structure possesses 3D open porous texture, abundant active sites, desired nitrogen bonding type, and high specific surface area, providing them with excellent ORR activity. The optimal performing \(\textrm{Fe}-\textrm{Co}-\textrm{NC}\) catalyst presents an outstanding ORR performance in terms of a high onset potential ( \(\textrm{E}_{\text{ onset } }\) ) of 0.96 V (vs. RHE) and half-wave potential ( \(\textrm{E}_{1 / 2}\) ) of 0.86 V (vs. RHE), respectively, possible to rival those of the commercially available \(\textrm{Pt} / \textrm{C}\) in an alkaline electrolyte solution. Besides, the \(\textrm{Fe}-\textrm{Co}-\textrm{NC}\) catalyst manifests better stability than those of commercially available \(\textrm{Pt} / \textrm{C}\) , which is of importance for the optimization and characterization of novel electrocatalysts originated from non-precious metals.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Hu Lan,Zhao Qiuyue,Zhang Xinling,Li Huipeng,Bian Cheng,Zeng Yiqing
Redox sites and acidic sites are the main active sites of bimetallic oxide catalysts used for selective catalytic oxidation of NH 3 (NH 3 -SCO). In this work, three MMoO x (M = Cr, Fe, and Mn) bimetallic oxides catalysts were prepared by simple grinding and calcination to investigate the effect of redox sites (M sites) on the NH 3 -SCO performance. The NH 3 -SCO test results showed that the activity of MMoO x is in the order of CrMoO x > MnMoO x > FeMoO x . The characterization results of H 2 -TPR, O 2 -TPD, NH 3 -TPD, and in situ DRIFTS proposed that the NH 3 -SCO reaction on MMoO x catalysts is proceed via i-SCR mechanism, and the formation of the intermediates of NH 3 -SCR reaction is the decisive reaction step. Owing to the excellent ability in promoting the formation of nitrate/nitrite species, CrMoO x and MnMoO x samples show much higher NH 3 -SCO activity than FeMoO x sample . CrMoO x can facilitate the formation of a large amount of –NH 2 species, which together with nitrate/nitrite species enhance the NH 3 -SCO reaction via i-SCR reaction route. Therefore, CrMoO x shows the highest NH 3 -SCO activity among the MMoO x catalysts. Through this work, the redox sites of bimetallic oxide catalysts are demonstrated as a vital role in inducing the formation of reaction-active intermediates, which highlight the importance of choosing the redox sites in designing NH 3 -SCO catalyst.
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WATER RESEARCH
·
2017
·
IF 6.942
Xiaoxiang Cheng,Heng Liang,An Ding,Xuewu Zhu,Xiaobin Tang,Zhendong Gan,Jiajian Xing,Daoji Wu,Guibai Li
Coagulation and ozonation have been widely used as pretreatments for ultrafiltration (UF) membrane in drinking water treatment . While beneficial, coagulation or ozonation alone is unable to both efficiently control membrane fouling and product water quality in many cases. Thus, in this study an emerging alternative of ferrous iron/peroxymonosulfate (Fe(II)/PMS), which can act as both an oxidant and a coagulant was employed prior to UF for treatment of natural surface water, and compared with conventional coagulation and ozonation. The results showed that the Fe(II)/PMS-UF system exhibited the best performance for dissolved organic carbon removal, likely due to the dual functions of coagulation and oxidation in the single process. The fluorescent and UV-absorbing organic components were more susceptible to ozonation than Fe(II)/PMS treatment. Fe(II)/PMS and ozonation pretreatments significantly increased the removal efficiency of atrazine, p -chloronitrobenzene and sulfamethazine by 12–76% and 50–94%, respectively, whereas coagulation exerted a minor influence. The Fe(II)/PMS pretreatment also showed the best performance for the reduction of both reversible and irreversible membrane fouling, and the performance was hardly affected by membrane pore size and surface hydrophobicity . In addition, the characterization of hydraulic irreversible organic foulants confirmed its effectiveness. These results demonstrate the potential advantages of applying Fe(II)/PMS as a pretreatment for UF to simultaneously control membrane fouling and improve the permeate quality.
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高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Shuling Liu,Tongjun Li,Guozheng Dong,Xinao Wei,Keke Zhao,Bangan Lu,Yu Chen,Yanyan Liu,Jianchun Jiang,Baojun Li
To develop low-cost and efficient oxygen reduction reaction (ORR) electrocatalysts, single-atom catalysts (SACs) have attracted great attention to become vital to the applications of zinc-air batteries (ZABs) because of their high catalytic activity. The development of integrated SACs as self-supporting electrodes is crucial for ZABs to overcome the drawback of powder catalysts requiring binder. Herein, an integrated atomically dispersed FeSA/NC catalyst was obtained by pyrolysis of Fe-containing ZIF-8 on fir wood-derived carbon. The atomically dispersed Fe-N4 is an efficient catalytic active site for ORR. The self-supported ordered porous structure and continuous conductive network of the catalyst provide favorable conditions for the rapid mass/electron transfer. FeSA/NC catalyst demonstrates a positive half-wave potential of 0.90 V in 0.1 M KOH electrolyte and 0.80 V in acidic solution. The outstanding ORR activity outperforms those of commercial Pt/C and most reported M-N-C (M=Fe, Co, Ni, etc.) catalysts. A quasi-solid-state ZAB using the FeSA/NC in cathode shows an excellent peak power density of 77 mW cm–2 at 121 mA cm–2. The performance in quasi-solid-state batteries exceeds that of most other catalysts. This work provides a new path to the catalytically active carbon via design of self-supporting SACs, and a clear demonstration of prospects in quasi-solid-state energy devices.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Zhichong Wang,Kaixuan Wang,Yajuan Pan,Qing Ye,Chenxi Zhang,Dan Zhang,Yanxia Zhao,Yongliang Cheng
The incorporation of oxyanion groups offers a greater potential for enhancing the activity of oxygen evolution reaction (OER) electrocatalysts compared to traditional metal cations doping, owing to their unique configurations and high electronegativity. However, the incorporation of oxyanion groups that differ from those derived from the oxidation of anions in transition metal monoxides poses significant challenges, thereby limiting further applications of oxyanion group modification approach. Herein, we present a novel sulfate salt assistant approach to fabricate Fe-doped Ni 2 P modified with SO 4 2− /carbon (Fe-Ni 2 P-S/C) nanofibers as highly efficient OER electrocatalyst. The optimized Fe-Ni 2 P-S/C nanofibers display superb OER activity, requiring low overpotentials of 266, 323, and 357 mV at 100, 500, and 1000 mA cm −2 , respectively. Theoretical calculations reveal that the co-adsorption of PO 4 3− and SO 4 2− on the surface of reconstructed electrocatalyst can reduce the energy barrier of rate-determining step, thereby resulting in enhanced OER activity. The present study emphasizes the crucial role played by anion groups in OER activity as well as proposes a novel approach for incorporating anion groups into electrocatalysts.
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高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
An-qi Tang,Xuechao Xu,Cao-wei Chen,Mengyuan Tan,Lu Gao,Zhen-quan Yang
Enterobacter hormaechei , A zoonotic pathogen with escalating prevalence in global food sources, severely jeopardizes food safety, necessitating the development of high-performance detection methods. Herein, a novel colorimetric detection strategy integrating phages and nanozymes was proposed for foodborne E. hormaechei . Initially, four homologous phages (EhpYZU05, EhpYZU08, EhpYZU9–1 and EhpYZU10), which were isolated using E. hormaechei YZU05 as the host bacterium, were modified on the surface of NH 2 -MIL-88B(Fe) to fabricate four phage@NH 2 -MIL-88B(Fe) nanozymes. These nanozymes exhibit peroxidase-like activity, catalyzing 3,3′,5,5′-tetramethylbenzidine (TMB) chromogenic reaction in presence of H 2 O 2 . With introduction of multiple host or non-host E. hormaechei strains, TMB chromogenic reaction catalyzed by phage@NH 2 -MIL-88B(Fe) nanozymes can be specifically inhibited. This inhibition occurs due to the specific phage adsorption of phage@NH 2 -MIL-88B(Fe) nanozymes towards these host or non-host E. hormaechei strains, indirectly blocking their catalytic sites. Leveraging this principle, colorimetric broad-spectrum detection of E. hormaechei was achieved. Additionally, this method demonstrated reliable recoveries (96.7 % ~ 103.3 %) when applied to detect real food matrices, highlighting its high reliability in practical scenarios. This approach not only clarifies the intrinsic mechanism of phage-modified nanozymes for target bacteria detection but also provides a robust and reliable method for early pathogen detection, thereby significantly contributing to food safety enhancement
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PubMed
高影响因子
Nanoscale
·
2025
·
IF 5.1
Junhao Hu,Mengzhu Liu,Yuqi Zhai,Yongpeng Wang
C nanofibers dotted with square Fe@C crystals derived from metal–organic frameworks (MOFs) with a novel 3D hierarchical architecture were successfully prepared through electrospinning, hydrothermal processing, and high-temperature pyrolysis. The introduction of carbon nanofibers endowed the particles with directional action and mechanical support, inhibiting local agglomeration and the collapse of the Fe@C crystals. The unique overall 3D porous structure with micro-concavities on its surface provided sufficient paths for electromagnetic wave transmission, abundant heterostructured interfaces for interfacial polarization and a connected network for conductive loss. The appropriate combination of the magnetic Fe@C crystals with dielectric carbon nanofibers optimized the impedance matching. Benefitting from the ingenious design, the composites exhibited excellent electromagnetic wave absorption (EWA) performances. FC1–30 was found to exhibit a minimum reflection loss (RLmin) of −28.09 dB at a thickness of 5.5 mm and a widest effective absorption bandwidth (EAB) of 1.1 GHz at a thickness of 2.5 mm. FC1–10 showed a RLmin of −20.82 dB at a thickness of 3.0 mm and a broadest EAB of 3.8 GHz at a thickness of only 1.5 mm. The preparation process was optimized, and the influence of the filler loading ratio on EWA performance was investigated. The EWA mechanism has been discussed in detail. The study provides an opportunity for the development of advanced electromagnetic devices with integrated structure and function.
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高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jingwen Wang,Yu Yang,Lei Chen,Yanping Ding,Linli Tan,Qiulin Shi,Yong Liu,Pengchao Xie
Molybdenum disulfide (MoS 2 ) is viewed as a promising two-dimensional Fenton-like catalyst, but the basal plane could not be well applied in peroxides activation. In this study, Fe(III) species were atomically impregnated on the MoS 2 basal plane to enhance peracetic acid (PAA) activation. The surface Fe(III) up shifted the d-band centre of MoS 2 and acted as electron shuttles in breaking the O-O bonds of PAA. HO • , CH 3 COO • and Fe(V) were generated in the Fe(III)-MoS 2 /PAA system, whereas the 1 O 2 production was inhibited on the Fe(III)-MoS 2 surface. Sulfamethazine (SMT) was efficiently degraded by Fe(III)-MoS 2 /PAA during 15 min reaction, with the observed removal efficiencies of SMT by Fe(III)-MoS 2 ( k obs ) being 25-fold higher than that by MoS 2 . Increasing the dosages of PAA and Fe(III)-MoS 2 facilitated SMT degradation, and high removal rate of SMT was achieved in the pH range of 3–5. HO • and Fe(V) were identified as critical reactive species responsible for the SMT degradation. Nitrification and Smiles rearrangement were proposed as the degradation pathways of SMT based on the identified oxidation products. This study demonstrates that impregnating Fe species would be an effective strategy for strengthening the Fenton-like reactivity of MoS 2 .
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高影响因子
RARE METALS
·
2024
·Vol. 43
·期 8
·3876-3892
·
IF 9.6
Chai Fei,Zhao Fei-Ping,Hu Zhan,Wen Shi-Yi,Samia Ben-Hammouda,Fu Ze-Lin,Lai Xin-Ting,Liang Yan-Jie,Min Xiao-Bo,Chai Li-Yuan
Arsenic materials have attracted great attention due to their unique properties. However, research concerning iron–arsenic (Fe–As) alloys is very scarce due to the volatility of As at low temperature and the high melting point of Fe. Herein, a new Fe–As alloy was obtained by mechanical alloying (MA) followed by vacuum hot-pressed sintering (VHPS). Moreover, a systematic study was carried out on the microstructural evolution, phase composition, leaching toxicity of As, and physical and mechanical properties of Fe–As alloys with varying weight fractions of As (20%, 25%, 30%, 35%, 45%, 55%, 65%, and 75%). The results showed that pre-alloyed metallic powders (PAMPs) have a fine grain size and specific super-saturated solid solution after MA, which could effectively improve the mechanical properties of Fe–As alloys by VHPS. A high density (> 7.350 g·cm −3 ), low toxicity, and excellent mechanical properties could be obtained for Fe–As alloys sintered via VHPS by adding an appropriate amount of As, which is more valuable than commercial Fe–As products. The Fe-25% As alloy with low toxicity and a relatively high density (7.635 g·cm −3 ) provides an ultra-high compressive strength (1989.19 MPa), while the Fe-65% As alloy owns the maximum Vickers hardness (HV 0.5 899.41). After leaching by the toxicity characteristic leaching procedure (TCLP), these alloys could still maintain good mechanical performance, and the strengthening mechanisms of Fe–As alloys before and after leaching were clarified. Changes in the grain size, microstructure, and phase distribution induced significant differences in the compressive strength and hardness. Graphical abstract
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Jianfang Jiang,Kuaqian Deng,Rui Duan,Cong An,Fanglin Dao,Jiali Huang
Organophosphorus pesticides (OPs) are extensively utilized in agricultural production, but they pose significant threats to environment and organisms. This study aims to develop a novel method for the rapid and efficient detection of OPs. Initially, an iron/manganese zeolitic imidazolate framework (Fe/Mn-ZIF) with excellent oxidase-like activity was synthesised. The catalytic performance was evaluated, and the main factors influencing catalytic activity were investigated. Subsequently, a combined acetylcholinesterase assay was employed to detect three OPs. The specificity and recyclability of Fe/Mn-ZIF were also studied. The proposed colorimetric strategy demonstrated strong linear relationships: 0.1–2 mg/L for trichlorfon, 0.2–14 mg/L for glyphosate, and 0.4–10 mg/L for glufosinate, with the low detection limits of 0.024, 0.080, and 0.121 mg/L (3 S/N) respectively. Good recoveries were observed in real sample detection. This work lays a foundation for enhancing the catalytic performance of Fe/Mn-ZIF, which holds promise for biosensing applications.
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高影响因子
Journal of Physical Chemistry C
·
2024
·
IF 3.3
Caiyi Jiang,Ming Hou,Li Yang,Shenghui Guo,Guo Yang,Bo Xing,Yi Wang,Dongzheng Wang,Xiaolin Shi
Fe–N co-doped carbon catalyst has received increasing attention in the field of organic wastewater treatment because of its unique structure and outstanding activity. However, the reusability, catalytic activity, and pH working range are still a great challenge for future application. Herein, a novel αFe-HM@C-T catalyst was prepared by pyrolyzing a mixture of starch and heme and was analyzed by TEM, H2-TPR, XRD, BET, XPS, FTIR, and Raman spectrum. Meanwhile, αFe-HM@C-T catalysts show the highest catalytic performance due to abundant porous structure, higher redox property, and unique Fe–Nx configuration. The rhodamine B (RhB) could be almost completely degraded within 30 min on the 5Fe-HM@C-850, and recovery rates of catalytic activity of 96% and 91.8% were achieved in peroxydisulfate (PDS) and H2O2 systems with an extensive buffer pH range. Furthermore, mechanistic insights by quenching experiments and EPR verified the high removal efficiency of RhB mainly attributed to indirect oxidation of SO4•–, •OH, and 1O2 in both systems, and the potential mechanism was proposed.
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高影响因子
Frontiers in Energy
·
2025
·
IF 6.2
Tang Wenbin,Xia Shuyue,Chou Haiwen,Zhao Jianan,Zhou Yi,Huang Qinghong,Yu Nengfei,Wu Yuping
The oxygen reduction reaction (ORR) plays a crucial role in key processes of fuel cells and zinc-air batteries. To enable commercialization, reducing the platinum (Pt) content and increasing the specific activity per unit mass is essential. A promising approach involves synthesizing of Fe-N-C precursors via the polyaniline (PANI) pathway, which ensures a uniform distribution of Fe-N-C species and facilitates the subsequent adsorption of platinum ions. This leads to the formation of Pt-Fe bimetallic alloys. The synergistic interaction between Pt and Fe-N-C sites promotes the homogeneous dispersion of Pt and the formation of smaller particle sizes, which in turn enhances intrinsic activity and stability of the catalyst. Notably, the Pt/Fe-N-C catalyst, featuring an ultra-low Pt loading of just 1.79 wt%, exhibits a remarkable doubling of mass activity compared to conventional catalysts. Moreover, zinc-air batteries using this catalyst achieve an impressive peak power density of 200 mW/cm 2 .
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