MOLECULES
·
2024
·Vol. 29
·期 10
·2349
·
IF 4.2
Ziwei Deng,Wei Liu,Junyuan Zhang,Shuli Bai,Changyu Liu,Mengchen Zhang,Chao Peng,Xiaolong Xu,Jianbo Jia
A Fe-Co dual-metal co-doped N containing the carbon composite (FeCo-HNC) was prepared by adjusting the ratio of iron to cobalt as well as the pyrolysis temperature with the assistance of functionalized silica template. Fe1Co-HNC, which was formed with 1D carbon nanotubes and 2D carbon nanosheets including a rich mesoporous structure, exhibited outstanding oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalytic activities. The ORR half-wave potential is 0.86 V (vs. reversible hydrogen electrode, RHE), and the OER overpotential is 0.76 V at 10 mA cm−2with the Fe1Co-HNC catalyst. It also displayed superior performance in zinc–air batteries. This method provides a promising strategy for the fabrication of efficient transition metal-based carbon catalysts.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Ao Ding,Yupeng He,Fei-Fei Chen,Yan Yu
Bacterial infections result in significant burdens on public health, especially with the increasing prevalence of antibiotic resistance owing to the overuse of antibiotics. The development of the next-generation nanoantibacterial materials as alternatives to antibiotics is urgently needed. Metal–organic frameworks (MOFs) have been emerging as promising antibacterial materials. However, the impact of metal centers on the properties and antibacterial activity of MOFs has not been clarified to date. In this work, five M-MOF nanomaterials (M = Fe, Co, Ni, Cu, Zn) are synthesized with 2-methylimidazole as an organic ligand. Subsequently, the minimum inhibitory concentration (MIC), minimum bactericidal concentration, and time-kill curves are studied to evaluate their antibacterial activity. In addition, the destruction of the bacterial cells after treatment with M-MOFs is observed via scanning electron microscopy. The experimental results demonstrate that the Co-MOF and Zn-MOF polyhedra exhibit optimal antibacterial activity. They can effectively inhibit the growth of both Gram-negative bacteria Escherichia coli and Gram-positive bacteria Staphylococcus aureus at a low concentration. On the other hand, the Fe-MOF irregular particles show the weakest antibacterial activity among five M-MOFs and the antibacterial activity of the Ni-MOF and Cu-MOF nanosheets are comparable to each other. The huge difference in antibacterial activity of M-MOFs is attributed to the difference in the shape and size, specific surface area, surface charge, ion release, and production of reactive oxygen species. Overall, this study clarifies the relationship between metal centers in M-MOFs and their antibacterial activity.
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Environmental Technology & Innovation
·
2025
·
IF 7.1
Shuzhen Yang,Bingjing Tian,Yanfang Huang,Bingbing Liu,Shengpeng Su,Wenjuan Wang,Guihong Han
The persistent dye rhodamine B (RhB) in textile wastewater poses severe ecological threats, demanding efficient and sustainable treatment technologies. This study synthesized a novel trimetallic Cu-Fe-Co catalyst via a nitrogen-atmosphere co-reduction method. The catalyst’s unique advantage lies in the synergistic effects of Cu, Fe, and Co, which significantly enhance catalytic performance. The redox-active phases of Cu, combined with the Fenton-like reactivity of Fe, are further optimized by Co doping to improve reactive oxygen species (ROS) generation and electron transfer efficiency. Characterization revealed a dendritic structure dominated by Cu, Cu₂O, and FeO phases, with Co-induced lattice expansion (Δ d / d = +0.25 %) enhancing surface reactivity. Under optimized conditions (pH 3, 1.5 g/L catalyst, 20 mg/L RhB), the ternary Cu-Fe-Co catalyst achieved 99.8 % RhB degradation within 40 min, with high mineralization efficiency (46.5 % TOC removal, 82.1 % COD removal). Mechanistic studies demonstrated that Co incorporation promotes the conversion of superoxide radicals (·O₂⁻) into long-lived singlet oxygen (¹O₂), synergistically enhancing oxidative effects from ·OH and ¹O₂, while in situ H₂O₂ generation drives radical chain reactions. Compared to binary catalysts, the ternary system exhibits superior degradation kinetics for RhB and maintains 95.8 % degradation efficiency even after five cycles. This study provides new insights into trimetallic catalyst design, highlighting its practical potential for wastewater treatment.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2025
·
IF 4.9
Li Huanxuan,Wei Xueheng,Gao Xing,Liu Chen,Li Ning,Xu Chen,Huang Jingang,Liu Xiuyan,Xu Shaodan
The degradation of antibiotics remains a major and persistent challenge in wastewater treatment. This study reports the synthesis of three distinct catalysts from a zeolitic imidazolate framework-67 (ZIF-67) precursor through pyrolysis at 800 °C, namely ZIF-67(Fe)-800, ZIF-67(Co)-800, and ZIF-67(FeCo)-800. Comprehensive characterization (e.g., X-ray diffractometer and transmission electron microscopy analyses) confirmed their graphitic carbon matrix, specific metallic phases, and unique polyhedral morphologies. These catalysts were employed to activate peroxymonosulfate (PMS) for ciprofloxacin (CIP) degradation. Strikingly divergent catalytic performances were observed, with CIP degradation rate constants of 0.0027, 0.0731, and 0.0504 min –1 for ZIF-67(Fe)-800, ZIF-67(Co)-800, and ZIF-67(FeCo)-800, respectively. Furthermore, the bimetallic ZIF-67(FeCo)-800 demonstrated consistently inferior performance in activating both peroxydisulfate and sodium percarbonate compared to PMS, resulting in significantly lower CIP degradation rates of 52% and 87%, respectively. Mechanistic investigations using electron paramagnetic resonance and quenching tests revealed that hydroxyl radical ( · OH), sulfate radical (SO 4 •− ), and singlet oxygen ( 1 O 2 ) were the dominant reactive species in both the ZIF-67(Fe)-800/PMS and ZIF-67(Co)-800/PMS systems. In contrast, the ZIF-67(FeCo)-800/PMS system operated via a distinct pathway, primarily generating SO 4 •− , accompanied by · OH, 1 O 2 , and superoxide radicals (O 2 •− ). Notably, H 2 PO 4 − and HCO 3 − exhibited strong inhibitory effects on CIP degradation, while SO 4 2− and CH 3 COO − led to modest rate enhancements. Overall, this work provides a rational framework for designing MOF-derived catalysts and highlights their potential for application in advanced oxidation processes aimed at removing pharmaceutical pollutants.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2026
·
IF 9.1
Lingzhen Miao,Siqi Luo,Ziru Liang,Ming Lu,Pengcheng Wang
The treatment of wastewater laden with energetic compounds, particularly 2,2′,4,4′,6,6′-hexanitrostilbene (HNS), remains highly challenging owing to the environmental persistence and inherent toxicity of nitroaromatic derivatives. Herein, we reported a CoFe 2 O 4 /PMS system for the first-time efficient degradation of HNS. The CoFe 2 O 4 /PMS process afforded 96.3% removal of HNS within 150 min, together with 89.3% chemical oxygen demand (COD) removal and 49.5% total organic carbon (TOC) removal, indicating substantial deep oxidation and partial mineralization. Mechanistic studies combining quenching experiments, EPR spectroscopy, electrochemical analysis, and DFT calculations disclosed a synergistic radical/non-radical pathway dominated by 1 O 2 , with Fe incorporation enhancing PMS adsorption, charge transfer, and catalytic activation. HPLC-MS revealed degradation intermediates and supported three plausible degradation pathways, whereas QSAR analysis indicated progressive detoxification during oxidation. The catalyst further exhibited excellent stability, negligible metal leaching, and broad applicability toward actual HNS production wastewater and other energetic organic pollutants. These findings identify CoFe 2 O 4 /PMS as a promising platform for the efficient remediation of hazardous energetic compound wastewater.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2026
·
IF 19.7
Die Yuan,Kai Li,Xuebin Lu,Chaoqin Zhao,Guijian Zhang,Ping Ning,Dongdong Zhang,Xin Sun,Shuangyou Bao,Chi Wang
A dual-channel electron-donation pathway enables reductant-free Fe 2+ /Co 2+ regeneration. • Pollutants and S 2- synergistically drive reversible M(III)/M(II) redox cycling. • Co 9 S 8 /FeS/PMS achieves rapid and complete levofloxacin degradation within 10 min. A magnetic Co 9 S 8 /FeS composite derived from cobalt slag was developed for reductant-free PMS activation through a novel dual-channel electron-donation pathway involving S 2- species and levofloxacin (LEV). The catalytic performance and mechanism were investigated through degradation kinetics, reactive-species identification, X-ray absorption fine spectroscopy (XAFS), X-ray photoelectron spectroscopy (XPS) analyses, density functional theory (DFT) and life cycle assessment. The Co 9 S 8 /FeS/PMS system completely degraded LEV within 10 min (k = 0.4498 min −1 ), maintained efficient removal over pH 3.0–11.0 and after five cycles (>95%), with 1 O 2 as the dominant reactive species. DFT calculations, together with XAFS/XPS analyses, revealed that S 2− and LEV serve as dual electron donors to facilitate Fe 3+ /Co 3+ reduction, achieving nearly complete Fe/Co redox cycling and sustained PMS activation. Compared with conventional single-electron-donor Fenton-like systems, this strategy eliminates the need for external reductants and substantially reduces environmental impacts, offering a sustainable route for converting cobalt slag into recyclable catalysts for antibiotic wastewater treatment. Download: Download high-res image (176KB) Download: Download full-size image
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Catalysis Science & Technology
·
2025
·
IF 4.2
Yifan Zhang,Jiaying Liu,Shiwei Wang,Zhihao Yu,Haojian Zhang,Dong Wang,Lin Zhu,Chunzheng Wu,Hongbo Yu
Modifying noble metal catalysts with transition metal oxides (MO x ) can markedly enhance catalytic performance through synergistic effects, yet precise spatial colocalization of active metal and promoter phases remains challenging. Here, we report the synthesis of KIT-6 supported Pd-MO x (M = Fe, Co, Ni) hybrid nanostructures via in situ transformation of bimetallic PdM nanoparticles under controlled thermal conditions. The resulting Pd-MO x /KIT-6 catalysts displayed superior activity and selectivity in the selective hydrogenation of acetophenone to 1-phenylethanol compared with monometallic Pd/KIT-6. Among them, Pd-CoO x /KIT-6 (Pd/Co=1:1) achieved the highest performance, with 99.7% acetophenone conversion and 98.2% selectivity, and demonstrated broad applicability for hydrogenating diverse ketones. Structural and kinetic studies revealed that interfacial Pd-CoO x sites play a pivotal role: Pd domains efficiently dissociate H 2 , while CoO x species enhance acetophenone adsorption. This synergistic interface-driven mechanism provides a general and costeffective strategy for the selective hydrogenation of multifunctional substrates.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Wei Jiang,Yajun Li,Hongcheng Li,Yuhao Fu,Yi Li,Jian Ren,Qian Li,Limei Pan,Jian Yang
In this work, a unique three-dimensional (3D) network NiFeCoP@Ti₃C₂Tₓ composite, consisting of Co, Fe co-doped Ni 2 P (NiFeCoP) nanosheets anchored on Ti₃C₂Tₓ nanosheets via heterojunction, was situ constructed by phosphidizing the NiFeCo-LDH@Ti₃C₂Tₓ precursor. The 3D network structure establishes a 3D conductive network while generating a built-in electric field at the heterointerface, which efficiently accelerates electron/ion transport and simultaneously improves the structure stability of the electrode. DFT calculations demonstrate that Co doping further optimizes the electronic structure of NiFeCoP, introduces additional active sites, thereby promoting electrochemical reaction kinetics. Meanwhile, the synergistic effect among Ni, Fe, and Co with different redox potentials effectively buffers the volume changes during charge/discharge processes. Consequently, NiFeCoP@Ti₃C₂Tₓ as lithium ion batteries (LIBs) anode shows outstanding electrochemical performance at different current density (950 mAh/g after 340 cycles at 0.5 A/g, 816 mAh/g after 900 cycles at 1 A/g, 541 mAh/g after 1000 cycles at 2 A/g).
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 15
·1-12
·
IF 2.8
Pan Yusong,Zhu Yuan,Wang Yuanqing,Huang Run,Pan Chengling
Based on the strong capability of transition metal ions for peroxymonosulfate (PMS) activation and highly affinity of MoS 2 towards PMS, thus decorating MoS 2 with transition metal ions would efficiently activate PMS for degradation of organic pollutants. In this work, Co/Fe co-doped MoS 2 catalyst were synthesized by simple chemical method. The prepared Co/Fe co-doped MoS 2 catalyst displayed excellent catalytic activity for organic pollutant degradation. The removal efficiency of RhB and MB is 99% in 6 min and 98% in 15 min under PMS system, respectively. Both the capture experiment and EPR results verified that 1 O 2 played an important role in the organic pollutant degradation process in PMS system. The catalytic mechanism revealed that the synergistic effect between Mo ion and Co/Fe ions is beneficial for boosting the catalytic properties of Co/Fe co-doped MoS 2 catalyst. The cycle experiments confirmed that Co/Fe co-doped MoS 2 possesses excellent chemical stability and re-usability.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 1
·1399-1412
·
IF 5.19
Chen Jun,Zhang Boding,Wang Bingxing,Zhang Wenlong,Wang Jichao,Cui Chengxing,Wang Songlin
Wastewater containing quinoline has become a common pollutant in water and soil environments, which poses a threat to human health due to its carcinogenicity, teratogenicity, and mutagenicity. Quinoline’s stability and toxicity hinders its degradation by conventional physicochemical and biological methods. In this contribution, Fe-Co-Bi/kaolin particle electrodes were prepared for the efficient degradation of quinoline in wastewater, and characterized by using scanning electron microscope, X-ray diffraction, pyridine-IR, Brunauer–Emmett–Teller, X-ray photoelectron spectroscopy, and four-probe resistivity test. Parameters affecting the degradation efficiency were optimized to be the particle electrode dosage of 40 g/L, pH 3.5, H 2 O 2 addition of 67.6 mmol/L, electrical conductivity of 12.7 ms/cm, and voltage of 20 V. The constructed three-dimensional catalytic particle electrode system (3D-CPE) achieved 92.1% removal rate of chemical oxygen demand (COD) under the optimal conditions. Hydroxyl radicals (•OH) generated in the 3D-CPE process were identified by radical scavenging tests and electron spin response analysis. To unravel the degradation mechanism, the intermediate products were identified by using high performance liquid chromatography-mass spectrometry. The degradation mechanism was discussed with the help of theoretical calculation.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qiansheng Li,Hong Lu,Xiaolei Wang,Zhongqiang Hong,Ze Fu,Xinxin Liu,Jiti Zhou
Low solar energy utilization, instability of Fe ions and Fe(III)/Fe(II) cycle difficulty are three main factors, limiting the photocatalytic activity of the Fe/peroxymonosulfate (PMS) system. Herein, based on the N and Fe co-doped carbon dots (N, Fe-CDs) synthesized by a facile one-pot hydrothermal method, a new Fe(III)/Fe(II) cycle system for PMS activation under visible light irradiation was proposed. The characterization experiments showed that Fe has been successfully doped to the sp 2 graphitic structure and mainly existed as Fe-N and Fe-OH complexes, which played an important role in harvesting visible light, enhancing the stability of Fe ions and acting as active sites to accelerate electron transfer. Under visible light irradiation, the photogenerated electrons of N, Fe-CDs could be directly transferred to Fe (III) for Fe (II) formation via the ligand-to-mental charge transfer process, thus accelerating the Fe(III)/Fe(II) cycle. When N, Fe-CDs were used for activating PMS under visible light irradiation, aminopyrine could be efficiently degraded and mineralized to CO 2 via the cleavage of pyrazole ring, demethylation, hydroxylation, decarbonylation and the cleavage of benzene ring. The produced O 2 − and 1 O 2 played the main roles in the whole photocatalytic reaction. The above results revealed that the novel N, Fe-CDs could effectively activate PMS under visible light irradiation for the degradation of pharmaceuticals in the polluted water.
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ACS Catalysis
·
2022
·
IF 13.7
Yuting He,Xiaoxuan Yang,Yunsong Li,Liting Liu,Shengwu Guo,Chengyong Shu,Feng Liu,Yongning Liu,Qiang Tan,Gang Wu
Single-metal site catalysts have exhibited highly efficient electrocatalytic properties due to their unique coordination environments and adjustable local structures for reactant adsorption and electron transfer. They have been widely studied for many electrochemical reactions, including oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). However, it remains a significant challenge to realize high-efficiency bifunctional catalysis (ORR/OER) with single-metal-type active sites. Herein, we report atomically dispersed Fe–Co dual metal sites (FeCo–NC) derived from Fe and Co co-doped zeolitic imidazolate frameworks (ZIF-8s), aiming to build up multiple active sites for bifunctional ORR/OER catalysts. The atomically dispersed FeCo–NC catalyst shows excellent bifunctional catalytic activity in alkaline media for the ORR (E1/2 = 0.877 V) and the OER (Ej=10 = 1.579 V). Moreover, its outstanding stability during the ORR and the OER is comparable to noble-metal catalysts (Pt/C and RuO2). The atomic dispersion state, coordination structure, and the charge density difference of the dual metal site FeCo–NC were characterized and determined using advanced physical characterization and density functional theory (DFT) calculations. The FeCo–N6 moieties are likely the main active sites simultaneously for the ORR and the OER with improved performance relative to the traditional single Fe and Co site catalysts. We further incorporated the FeCo–NC catalyst into an air electrode for fabricating rechargeable and flexible Zn–air batteries, generating a superior power density (372 mW cm–2) and long-cycle (over 190 h) stability. This work would provide a method to design and synthesize atomically dispersed multi-metal site catalysts for advanced electrocatalysis.
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