ACS ES&T Engineering
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2025
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IF 6.7
Yuwen Qi,Fuyu Li,Chunhui Zhang,Xuejiao Tang,Cuiping Wang,Yanna Liang,Hongwen Sun,Baoshan Xing
Severe harmful effects of per-fluoroalkyl and polyfluoroalkyl substances (PFAS) to ecology and human health have led many countries to continuously upgrade their control for PFAS, which poses higher requirements for the efficient removal of PFAS in water to ensure water resource security. In the present study, the three-dimensional/two-dimensional (3D/2D) structure of metal oxide immobilized on a carbon substrate of the Fe-based metal–organic frameworks (Fe-MOF) heat treatment derivative H:MIL-101(Fe) was constructed. H:MIL-101(Fe) could completely remove PFOA from pure water within 5 min, and complete recovery was achieved within 30 s. H:MIL-101(Fe) exhibited stable properties and can maintain its initial adsorption percentage after four cycles of PFAS adsorption. It was found that the high hydrophobic interface of H:MIL-101(Fe) was formed by partial carbonization during the Fe-MOF heat treatment, and a large number of unsaturated ═C–H bonds on the unstructured benzene ring were generated. Furthermore, cationic chelating agent, such as cetyltrimethylammonium bromide, were mixed with PFAS to synthesize more hydrophobic long-chain complexes; six PFAS containing 4–8 carbon atoms could be completely coadsorbed in surface water within 10 min at pH 7.0, mainly depending on the mechanism of hydrophobic interaction. This study develops a novel adsorption material that can match PFAS types to realize the effective coadsorption of PFAS in water, which provides new insights for removal of PFAS with different carbon chains based on improving hydrophobic interactions between adsorbents and adsorbates.
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APPLIED SURFACE SCIENCE
·
2025
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IF 6.9
Xin Liang,Laishi Li,Yusheng Wu,Feng Liu,Yuzheng Wang
The efficiency of Fenton-like catalysts was critically affected by the rapid transfer of Fe 2+ /Fe 3+ , a process that was essential for the formation of active free radicals by H 2 O 2 . Herein, we synthesized CuS/Fe 3 O 4 @MIL-100(Fe) (CFM) ternary composites using hydrothermal and in-situ growth methods to enhance the degradation of oxytetracycline hydrochloride (OTC-HCl) in a Fenton-like photocatalytic system. The incorporation of CuS as a co-catalyst into the double iron-based system significantly enhanced photocatalytic activity, achieving a 95.31 % degradation efficiency for OTC-HCl within 50 min under optimized conditions. The catalyst had good reusability, has 86.64 % degradation efficiency after five magnetic recovery cycles, and still showed good catalytic performance in the presence of five different concentrations of common anions. Further analysis using active species quenching and electron paramagnetic resonance (EPR) experiments revealed the role of oxygen-containing radicals in the process. Liquid chromatography-mass spectrometry (LC-MS) and density functional theory (DFT) calculations provided OTC-HCl degradation pathways and intermediates. X-ray Photoelectron Spectroscopy (XPS) analysis indicated that CuS enhanced the performance of the bis-iron-based materials by improving the transfer efficiency of Fe 2+ /Fe 3+ and Cu + /Cu 2+ ions, which in turn accelerated the generation of reactive radicals from H 2 O 2 .
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 37
·16323-16330
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IF 2.7
Xiaoyue Yue,Chaoyun Wu,Chenxu Hao,Yanhong Bai
The abuse of tetracycline (TC) has led to serious threats to human health and the environment. Therefore, the rapid and sensitive detection of tetracycline is of particular importance. Herein, we successfully synthesised a bimetallic nanozyme D-Fe/Co-MOF with oxidase activity and established a colourimetric sensor. The complex of Fe2+ in D-Fe/Co-MOF and TC can release hydroxyl radicals (˙OH) and promote the oxidation of TMB. As a result, the colour of the detection system significantly changes, enabling the sensitive colourimetric detection of TC. Compared with the existing Fe/Co-MOF sensor, D-Fe/Co-MOF can effectively reduce the detection error caused by hydrogen peroxide decomposition, improving the accuracy of TC detection. Under the optimal conditions, the absorbance at 652 nm showed a good linear relationship with TC concentration in the range of 0.35–220 μg mL−1. The detection limit was as low as 0.0719 μg mL−1, considerably lower than the national safety standard. The proposed colourimetric sensor was also successfully used for the detection of TC in actual milk samples, and the results were in good agreement with those obtained via liquid chromatography. The proposed strategy for the detection of TC in food is expected to contribute to ensuring food safety and human health.
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ELECTROCHIMICA ACTA
·
2017
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IF 4.798
Qijian Niu,Junxia Guo,Yunhui Tang,Xindong Guo,Jun Nie,Guiping Ma
In this work, a bimetal-organic framework/graphene oxide with sandwich-type structure as a precursor is prepared by the solvent-thermal approach. A nanoporous reduced graphene oxide (rGO) nanosheets enriched with Fe, Co and N (Fe/Co-N) co-doped active sites is prepared followed by a high temperature carbonization and acid leaching (AL) process. When the molar ratio of Fe/Co is 0.40 before carbonization , the prepared sample exhibits optimized electrocatalytic activity (a high onset potential (0.98 V vs. RHE), half-wave potential (0.84 V vs. RHE), and a large limiting current density (-5.46 mA cm −2 at 0.21 V vs. RHE) as oxygen reduction reaction (ORR) electrocatalysts . Most importantly, the duration stability and methanol tolerance of the as-prepared sample are better than common commercial 20 wt% Pt/C under 0.10 M KOH alkaline condition. These results demonstrate the co-doping of bimetal Fe/Co and heteroatom N, excellent electrical conductivity of rGO and large surface area of nanoporous structure enhance the electrocatalytic activity . The successful synthesis of such nanoporous rGO nanosheets provides a facile way to explore a series of 2D non-precious metal electrocatalysts for energy conversion and storage devices.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Jiejie Feng,Liling Wei,Huayi Li,Jianquan Shen
The optimization of intermediate adsorption is pivotal for enhancing the efficacy of catalysts in oxygen evolution reaction (OER). However, many Co-based catalysts exhibit excessive binding energy toward intermediates, thereby restricting the desorption process. To address this issue, we utilized the Co-based vanadates (CoV) as a model and observed that the incorporation of Fe can effectively mitigate the substantial accumulation of intermediates around the catalysts, achieving a balance between the adsorption and desorption. It can be attributed to the Fe-doping, which modulated the electronic structure of CoV, subsequently increasing the catalytic sites and intrinsic activity. As a result, the CoV-Fe exhibited a low overpotential of 260 mV at 20 mA cm −2 , which decreased by 82 mV compared to pristine CoV. Besides, the electrolyzer based on CoV-Fe maintained a low cell of 1.46 V for water splitting and held a considerable attenuation of 4.49 % after 200 h of long-term operation.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2024
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IF 4.3
Tiantian Long,Hongmei Luo,Hongchen Li,Jingbo Sun,Yang Wang,Jiaquan Zhou,Yi Chen,Dong Xu
In this study, we aimed to synthesis of Fe-doping green fluorescent carbon dots (G-CDs) through the co-electrolysis of chrysoidine G and potassium ferrocyanide for Cr(VI) detection. The use of potassium ferrocyanide improves the quantum yield and sensing performance of G-CDs toward Cr(VI). The G-CDs have a maximum excitation wavelength of 308 nm and an emission wavelength of 510 nm. Comprehensive analyses including Raman, FT-IR, and XPS provided insights into the chemical structure and composition of the G-CDs. Under optimal conditions, G-CDs demonstrated concentration-dependent quenching upon interaction with Cr(VI). A linear relationship within the range of 0.25–100 µM was established with a calibration equation of ΔF/F0 = 0.005 + 0.015C Cr(VI) , yielding an R 2 value of 0.996 and a limit of detection of 0.15 μM. The applicability of the G-CDs method was demonstrated by successful Cr(VI) detection in water samples with recovery rates ranging from 98.8 % to 100.1 % and relative standard deviation within 3.0 %. The fluorescence lifetime and Zeta potential measurements confirmed that the mechanism was via a static quenching process, while redox reaction, nanoparticle aggregation, and surface charge variation also played significant roles.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Jiajia Tai,Quanxiong Lu,Xianliang Song
The progress in developing inexpensive and highly effective catalysts is vital for overcoming the current limitations of oxygen reduction reaction (ORR) and the practical application of fuel cells. This study constructed a three-dimensional (3D) composite catalyst using etra-β-(8-quinolinoxy) iron phthalocyanine (EFePc) as the sites of catalytic activity, nitrogen-doped reduced graphene oxide (NRGO) as the basal plane, and oxidized carbon black (OCB) as the intercalating agent. The morphological and structural characteristics of the composite catalyst were thoroughly analyzed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analysis, Fourier-transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectroscopy (XPS). Evidence from the results suggested that the 3D catalyst has been synthesized successfully. The EFePc-NRGO/OCB exhibited a half-wave potential (E 1/2 ) of 0.80 V, closely approximating those of commercial Pt/C (20 wt%). The average electron transfer number was 3.77, indicating a 4-electron transfer process. Furthermore, when the catalyst was applied to direct lignin fuel cells (DLFCs), the maximum power density reached 247.87 mW/m² which far exceeded Pt/C (53.13 mW/m²). This offers a novel perspective for the advancement of high-efficiency non-noble metal catalysts and the high-value utilization of lignin.
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JOURNAL OF MOLECULAR STRUCTURE
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2024
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IF 4
Bing Zhang,Yixin Luo,Binqiong Peng,Lisha Zhang,Ning Xie,Dan Yue,Weidong Li,Bowen Qin,Wenjing Du,Zhenling Wang,Yilei Zhang
The paper presents a green and easily prepared water-soluble fluorescent nitrogen doped carbon dots (N CDs) synthesized by one-step hydrothermal process. The N CDs displays brilliant blue fluorescence excited by UV light, with excellent water solubility, and a quantum yield of 15.7 %. The fluorescence intensity of N CDs remains unchanged after 48 h of exposure to ultraviolet light, exhibiting good photostability. Moreover, the ion sensing characteristics of these N CDs have been explored for more than a dozen anions and cations. The result reflects that this fluorescent CDs exhibits excellent sensitivity and selectivity for Fe 3+ within a range spanning of 40 ∼ 500 μΜ with a limit of detection down to 0.22 μΜ. The principle of sensor sensing is likely related to the formation of the internal filtering effect (IFE), which leads to a decline in the fluorescence intensity of N CDs in aqueous solutions containing Fe 3+ . Due to the excellent water solubility, good photostability and high yield of N CDs, the application of prepared N CDs/polyvinyl alcohol (PVA) as fluorescent materials for white LED devices was explored. The prepared N CDs/PVA (NCP) composite film can also exhibit bright blue light under 365 nm excitation, indicating good application prospects in the area of white LED devices and agricultural films.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Guitao Zhang,Kaicai Fan,Lingbo Zong,Fenghong Lu,Zumin Wang,Lei Wang
To achieve precise optimization of the geometric structure and control over spatial distribution of single atom active sites, we introduce an in situ polymer layer modification strategy. Through co-deposition of tannic acid (TA) and polyethyleneimine (PEI) on carbon nanotubes (CNTs), the polymer improves the dispersion and prevents the agglomeration of Fe atoms. Consequently, after controlled calcination, the geometrically distorted Fe-N 4 single atom active sites are constructed on the surface of the curved carbon support. The optimized distortion reduces the reaction energy barrier, optimizes the adsorption energy of oxygen intermediates, and leading to a remarkable improvement of oxygen reduction reaction (ORR) activity. As the result, the obtained single atom catalyst (SAC) Fe-NC@CNTs exhibits exceptional performance with a large onset potential ( E onset ) of 1.03 V and a half-wave potential ( E 1/2 ) of 0.91 V in 0.1 M KOH solution, surpassing the previously reported ORR electrocatalysts. Benefitting from these features, Fe-NC@CNTs-based rechargeable aqueous Zn-air battery (A-ZAB) delivers a higher power density of 209.5 mW cm −2 and can sustain stable changing/discharging for over 2000 h and experiences negligible charge–discharge potential gap fluctuation, being the most booming competitor among the reported electrocatalysts. Furthermore, quasi-solid-state Zn-air battery (QSS-ZAB) with Fe-NC@CNTs air cathode exhibits an impressive peak power density of 130.8 mW cm −2 , large round-trip efficiency of 82 %, and long cycling life of over 100 h. Our work reveals the relationship of strain-induced geometrical distortion and the structure activity relationship, offering a new way for the rational design of other highly efficient catalytic systems.
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JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
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IF 6.2
Huimin Mao,Zhengye Chen,Hong Tian,Shan Cheng,Lei Liu,Yanni Xuan,Yanshan Yin
Wheat straw (WS) baked at 260°C is used as raw material. The HZSM-5 was modified through alkali treatment (NaOH) and metal loading (Ni, Fe), followed by the introduction of MCM-41 layers onto the modified HZSM-5 to synthesize composite pore zeolites. A tubular furnace and Py-GC/MS were used to investigate the effects of different composite pore catalysts on the three-phase products and the distribution of bio-oil components during the catalytic fast pyrolysis(CFP) of WS. The use of 1 %FeAZ@M as a catalyst achieved the highest bio-oil yield (31.31 %). Introducing the micro-meso composite pore zeolite 0.3AZ@M as a catalyst resulted in the highest selectivity of monocyclic aromatic hydrocarbons (MAHs) in the bio-oil from WS CFP (52.12 %), along with a bio-oil yield of 26.50 %. The metal-modified composite pore zeolites exhibit enhanced acidity, which can further enhance the composition distribution in the bio-oil. The use of 1 %NiAZ@M as a catalyst resulted in the highest production of MAHs in the bio-oil from WS of CFP (60.67 %), with a bio-oil yield of 23.27 %. Among the bimetal-modified composite pore zeolites, 1 %Ni1 %FeAZ@M demonstrated the highest selectivity for MAHs, with MAHs in the bio-oil reaching 66.36 %, while the bio-oil yield increased to 28.41 %.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Kewang Zheng,Ling Xiao
Fe loading 3D micro-meso-porous carbon sphere (Fe@3C-2N) was derived from natural cellulose of sawdust and melamine through sodium alginate and ferric chloride cross-linking followed by carbonization processes, which served as peroxymonosulfate (PMS) activators for enrofloxacin (ENR) degradation. The cellulose was produced by the delignification of sawdust with sodium chlorite. The delignification of sawdust and the addition of melamine increased the porosity and electron transport capacity of Fe@3C-2N. When the dosages of Fe@3C-2N and PMS were 0.60 g L −1 and 0.20 g L −1 respectively, the degradation rate of ENR (20 mg L −1 ) reached 92.17 % within 80 min, suggesting the satisfactory activation performance of PMS. The good structural stability of Fe@3C-2N makes it suitable for use as packing in continuous flow reactors for wastewater treatment. Quenching experiments and electron paramagnetic resonance (EPR) suggested that SO 4 •− and 1 O 2 were the dominant reactive oxygen species (ROSs) in Fe@3C-2N/PMS system. X-ray photoelectron spectroscopy (XPS) revealed that Fe 3 C, pyrrolic N and graphitic N were the potential active sites.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Xing Li,Lei Xing,Chunyu Zhang,Shudan He,Fanghua Liu,Zhen Chen,Huazhen Chang,Junhua Li
Catalytic solvent regeneration is widely considered a promising solution for addressing the intensive heat duty of amine-based carbon dioxide (CO 2 ) capture. This highly challenging application has motivated researchers to develop excellent catalysts with high activity and durability. In this study, we engineered active and durable Fe − N − C catalyst coated with high-graphitization carbon layers (labeled Phen − Fe − N − C) through a secondary thermal pyrolysis treatment. The multiple graphite layers and atomic metal sties were verified by experimental characterization and coordination structure analysis. The improved graphite layers further enhanced the activity of Fe − N − C sites, providing more acid sites for proton-electron transfer and C − N breaking during solvent regeneration (or CO 2 desorption). Thus, the maximal CO 2 desorption rate increased by 50 % when Fe − N − C was used compared with that of the blank case, and the rate further increased by 27 % when Phen − Fe − N − C was used. After 15 days of hydrothermal testing, the single Fe atom over the spent catalysts presented no significant aggregation or dissolution in the solvent, validating the durability of Phen − Fe − N − C. This work demonstrates a feasible and novel strategy to improve M − N − C materials for efficient and robust CO 2 desorption from amine solvents toward energy-saving CO 2 capture.
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