JOURNAL OF MEMBRANE SCIENCE
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2023
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IF 9.5
Zewen Xu,Zhongyi Ren,Haojiang Zhu,Hao Guo,Xinliang Liu,Ming Wang,Yingfei Hou
Layer-by-layer (LBL) assembly method, with the advantages of simple operation and strong universality, has attracted much attention recently. However, the weak molecule-to-molecule and molecule-to-ion interactions have limited its development. During this work, the molecule-to-solid interaction was adopted and a robust LBL coating was achieved by alternately depositing positively charged Fe(OH) 3 colloids and negatively charged sodium alginate molecules. The molecule-to-solid interaction could continuously regenerate under corrosive conditions due to water insolubility and the chemical stability of solids. When the electrostatic interaction was broken, the abundant chemically stable solids acted as anchors to immobilize the soluble molecules and maintain the stability of the LBL coating. The prepared superwettable membranes exhibited superior oil-in-water emulsion separation efficiency, anti-fouling properties, and chemical stability. Meanwhile, the separation performance survived one week's harsh environments of strong acid and alkali.
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JOURNAL OF POWER SOURCES
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2023
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IF 9.2
Haiyang Lan,Jiaming Chu,Xingyu Chen,Qi Zhou,Weitao Jin,Yanhong Zhang,Juan Zhou
In a direct ammonia proton ceramic fuel cell (DA-PCFC), attaching a catalyst layer on the surface of the ammonia electrode is known to optimize the cell's electrochemical performance and long-term stability. In this study, the Fe catalyst layer is added to the ammonia electrode of the full cell which is prepared with the structure Ni– BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-δ (BZCYYb) (support layer)|Ni-BZCYYb (active layer)|BZCYYb|La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ to investigate its impact on the electrochemical performance and stability of the electrode. Under the conditions of 700 °C and 20 ml min −1 ammonia fuel, the peak power densities of cells with and without the Fe layer reach 585.051 and 463.671 mW cm −2 , respectively. It is evident that the addition of the Fe catalytic layer significantly improves the electrochemical performance of the cell. Stability tests are carried out for cells with and without the Fe layer at 650 °C, 0.36 A cm −2 , and 0.32 A cm −2 constant current discharge. After discharge for 313 and 372 h, both cells show good stability, and the discharge curves of the two cells are consistent after 100 h. The high M − N binding energy of the Fe catalytic layer improved the initial performance of the cell, but this improvement is not sustained over the stability.
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FOOD CHEMISTRY
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2023
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IF 8.8
Yu-Han Sun,Liu Yang,Xian-Xian Ji,Yuan-Zhen Wang,Yu-Long Liu,Ying Fu,Fei Ye
Flusilazole is a triazole fungicide with residues that are potentially toxic to humans. It enters the human body mainly through food, although its bactericidal activity is substantial. In this study, an electrochemical sensor Fe/Fe 2 O 3 @C with a core–shell structure was constructed to efficiently detect flusilazole by annealing MIL-53(Fe) which was prepared by a simple solvothermal method. Transmission electron microscopy and scanning electron microscopy were used to characterize the apparent morphology of MIL-53(Fe) and Fe/Fe 2 O 3 @C , and their structures were further characterized by X-ray photoelectron spectroscopy, Raman spectroscopy, powder X-ray diffraction, and the mapping of elements by energy dispersive spectroscopy. The electrochemical behavior of Fe/Fe 2 O 3 @C in the detection of flusilazole was evaluated by differential pulse voltammetry under optimal conditions. The results of the study indicate that the Fe/Fe 2 O 3 @C electrochemical sensor displayed excellent detection capabilities for flusilazole, where the sensor exhibited a wide detection range from 1.00 × 10 −4 to 1.00 × 10 −12 mol/L with an incredibly low LOD of 593 fM, making it highly sensitive to trace amounts of flusilazole. Moreover, Fe/Fe 2 O 3 @C demonstrated superior reproducibility, stability, and resistance to interference, highlighting its reliability in practical applications. The sensor was also successfully utilized to quantitatively detect flusilazole in various real samples, which suggests that Fe/Fe 2 O 3 @C has broad-spectrum environmental resistance and can effectively and rapidly detect flusilazole residues in different types of food items and environmental matrices. The study also delved into the mechanism of Fe/Fe 2 O 3 @C for the detection of flusilazole, providing a deeper understanding of the functionality of this sensor. Overall, these findings emphasize the practical significance of Fe/Fe 2 O 3 @C as an electrochemical sensor, showcasing its potential for real-world applications in food safety and environmental monitoring.
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Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Chen Yang,Xuefeng Hu,Yao Huang,Baiyu Liu,Junhan Yang
We report a rational and scalable synthetic approach to prepare Fe-decorated carbon nitride materials assisted by carbonized polyamine (C-Fe@PDA-CN). The material exhibited extremely high activity and stability for the degradation of 2-mercaptobenzothiazole (MBT) and other organic pollutants (phenol, BPA , MB , and RhB) under visible light irradiation. Furthermore, escape from CN to C-Fe@PDA provides an electron transfer channel to facilitate carrier separation and accelerate the generation of active species, as confirmed by photoluminescence , photoelectrochemical, and electron paramagnetic resonance (EPR). Fe exists in the material coordinated with the pyrrole nitrogen of polydopamine. This coordination structure is conducive to the generation of singlet oxygen ( 1 O 2 ). It is confirmed by steady-state phosphorescence spectroscopy (PH) that 1 O 2 originates from electron transfer. Superoxide radicals are generated by electron transfer and then oxidized into 1 O 2 by holes. The main intermediates of MBT degradation were identified by the LC-MS method, and a possible photocatalytic mechanism based on quenching experiments and EPR tests was proposed.
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RARE METALS
·
2023
·Vol. 42
·期 10
·3443-3454
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IF 8.8
Zhou Ming-Jie,Zhang Wen-Tao,Li Zhun,Feng Tao,Lan Si,Peng Zhen,Chen Shuang-Qin
Metallic glasses (MGs) are promising heterogeneous catalysts in water remediation, due to their superior efficiency, selectivity, reusability and corrosion resistance. However, few works are focused on the influence of inorganic anions that are abundant in wastewater. Herein, four common inorganic anions were added in a heterogeneous Fenton-like system (Fe–MG/H 2 O 2 ) to study inorganic anions’ influence on MGs’ catalytic performance during methylene blue (MB) degradation. Evidence demonstrated that chloride ions and dihydrogen phosphate ions had an adverse effect on the catalytic performance of Fe–MG, whereas Fe–MG/H 2 O 2 system sustained high efficiency in the presence of sulfate ions and nitrate ions during the Fenton-like process. By studying the structure, surface morphology, and evolution of active species, it was found that inorganic anions had a significant effect on the surface morphology of Fe–MG and the generation of active species. This work will provide essential references for MGs as heterogeneous catalysts in practical applications. Graphical abstract
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JOURNAL OF HAZARDOUS MATERIALS
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2026
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IF 10.6
Zhaorui Li,Simeng Gan,Xiaofeng Huang,Fei Wang,Xin Sun,Kai Li,Ping Ning
Preparation of Highly Crystalline Fe₂O₃-Based Catalyst (WCS600) from Copper Slag. • Thermal Reconstruction Tunes Fe–O Coordination and Oxygen Vacancies in WCS600. • Oxygen vacancies promote nitrate adsorption and activation and construct the Fe–OH working interface. • ICCUS-derived H₂ supply can reduce the NH₃ production cost to below 1.15 $ kg -1 . The synergistic treatment of copper slag valorization and nitrate wastewater remediation represents a critical pathway toward the high–value utilization of metallurgical solid waste and nitrogen resource recovery. This study employs a strategy synergistically coupling thermal reconstruction with surface defect engineering to convert the Fe–containing phases in copper smelting slag into an Fe₂O₃–based electrocatalyst, designated as WCS600. At −0.6 V vs. RHE, WCS600 achieves an NH₃ production rate of 7.16 mg h⁻¹ cm⁻² and a FE NH3 of 91.56%. Characterization and DFT calculations reveal that cathodic polarization induces the electrochemical reconstruction of surface oxygen vacancies, dynamically generating an interface enriched with mixed–valence Fe²⁺/Fe³ ⁺ species and hydroxylated Fe–OH. This interface promotes the directional conversion of nitrogen–containing intermediates, thereby enhancing NH₃ selectivity. In a simulated acidic smelting wastewater system, WCS600 exhibits excellent stability and resistance to interference, with Fe leaching remaining below the safety threshold. Further techno–economic analysis indicates that, under specific scenarios coupling low–carbon hydrogen sources, the NH₃ production cost of WCS600 could be reduced to below 1.15 $ kg⁻¹ . This study provides a theoretical foundation and practical guidance for the synergistic resource–oriented treatment of solid waste and nitrate wastewater, as well as for the development of scalable electrochemical ammonia synthesis. Download: Download high-res image (227KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Xiaohan Guo,Yanfang Liu,Hongxiang Zhu,Xiaohui Yu,Feng Shi,Qinqin Liu,Qiang Liu,Ying Xu
Asp donates electrons to reprogram Fe O clusters of MIL-53(Fe). • This electronic switch redirects dominant ROS from •OH to •O 2 − . • The mechanism enables neutral-pH POD-like activity of MIL-53(Fe)@Asp. • The Asp-modified nanozyme integrates with GOX for cascade glucose sensing. MIL-53(Fe) exhibits peroxidase-like activity only under acidic conditions, limiting its biosensing applications. We overcome this by using aspartic acid (Asp) as a structure-directing agent to modify MIL-53(Fe) (MIL-53(Fe)@Asp) via hydrothermal synthesis followed by Asp coordination. Unlike conventional pH-reduction strategies, Asp modification does not alter bulk pH but induces intrinsic electronic restructuring of Fe O clusters, as confirmed by increased Fe 3+ /Fe 2+ ratio and introduction of N → Fe coordination (XPS). At pH 6.9, the TMB-based activity of MIL-53(Fe)@Asp is 27-fold higher than that of pristine MIL-53(Fe). Steady-state kinetics show favorable Km values (TMB 0.27 mM, H 2 O 2 1.38 mM) at neutral pH. Mechanistic studies (ROS identification, EPR, band structure, DFT) reveal that Asp exerts an electron-donating effect that reprograms the electron distribution of Fe O clusters, activating the otherwise inactive MIL-53(Fe) framework at neutral pH and diversifying the catalytic pathways to include a less pH-dependent •O 2 − route alongside the partially maintained •OH pathway. This pathway diversification enables efficient neutral-pH peroxidase-like catalysis, with •O 2 − as the dominant pathway. Leveraging this, we construct a cascade nanoplatform (MIL-53(Fe)@Asp@GOX) integrating glucose oxidase, which exhibits excellent cascade activity at neutral pH. The method is applied to glucose detection in blood and saliva, demonstrating good linearity, precision, selectivity, and recovery. The glucose concentrations determined by our sensor correlated well with those obtained using a commercial assay kit. Notably, the limit of detection for glucose in saliva reaches 2.08 μM, offering a promising route toward non-invasive glucose sensing. This work establishes a design principle for creating pH-adaptive catalytic microenvironments in Fe-MOFs through electronic restructuring and pathway diversification, overcoming a long-standing limitation of MIL-53(Fe) for biomedical applications. Download: Download high-res image (111KB) Download: Download full-size image
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AQUACULTURE
·
2023
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IF 4.5
Xiangjie Mao,Wangwang Chen,Xianmei Long,Xiaomei Pan,Guoqing Liu,Wenguang Hu,Dianchao Gu,Qingsong Tan
The aim of this study was to investigate the effects of dietary iron (Fe) levels on the growth performance, health status, meat quality, and intestinal flora of juvenile largemouth bass ( Micropterus salmoides ) and to determine the dietary Fe requirement of largemouth bass . Largemouth bass was fed with 6 isonitrogenous and isocaloric experimental diets containing Fe levels of 42.26, 50.79, 66.61, 80.86, 123.13, and 201.87 mg/kg for 10 weeks. The results showed that both final body weight (FBW) and specific growth rate (SGR) tended to increase and then decrease with increasing dietary Fe level, reaching their highest values of 50.34 g and 3.58%/d at a dietary Fe concentration of 80.86 mg/kg respectively. Feed efficiency (FE) and protein efficiency ratio (PER) increased linearly with increasing dietary Fe level. Total serum protein (TP) and urea nitrogen (UN) decreased linearly with increasing dietary Fe level. Serum superoxide dismutase (SOD) and catalase (CAT) enzyme activities tended to increase and then decrease with increasing dietary Fe level, while serum malondialdehyde (MDA) level tended to decline and then increase. In addition, increased dietary Fe level tended to improve muscle hardness and chewiness , thus improving meat quality. Analysis of the intestinal flora showed that the abundance of microorganisms such as Plesiomonas , Peptostreptococcaceae , and Lactococcus in the genus level increased significantly at dietary Fe concentrations of 80.86 mg/kg and 201.87 mg/kg, indicating that appropriate levels of dietary Fe can increase the diversity of intestinal microorganisms . Optimal dietary Fe levels for juvenile largemouth bass were determined to be between 73.81 and 83.22 mg/kg based on the broken-line regression analyses of SGR, FE, or hemoglobin content.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Tianwei Wang,Quan Zhang,Kang Lian,Gaocan Qi,Qian Liu,Ligang Feng,Guangzhi Hu,Jun Luo,Xijun Liu
Metal-organic frameworks (MOF) derived carbon materials are considered to be excellent conductive mass transfer substrates, and the large specific surface area provides a favorable platform for loading metal nanoparticles . Tuning the coordination of metals through polyacid doping to change the MOF structure and specific surface area is an advanced strategy for designing catalysts. Modification of Fe-doped ZIF-8 pre-curing by pyrolysis of phosphomolybdic acid hydrate (PMo), Fe nanoparticles confined by Mo and N co-doped carbon frameworks (Fe-NP/MNCF) were fabricated, and the impact of PMo doping on the shape and functionality of the catalysts was investigated. The Zn-air battery (ZAB) driven CO 2 electrolysis was realized by using Fe-NP/MNCF, which was used as bifunctional oxygen reduction reaction (ORR) and carbon dioxide reduction reaction (CO 2 RR) catalysts. The results show that the half-wave potential (E 1/2 ) of Fe-NP/MNCF is 0.89 V, and the limiting diffused current density ( j L ) is 6.4 mA cm −2 . The ZAB constructed by Fe-NP/MNCF shows a high specific capacity of 794.8 mAh g Zn −1 , a high open-circuit voltage (OCV) of 1.475 V, and a high power density of 111.6 mW cm −2 . Fe-NP/MNCF exhibited efficient CO 2 RR performance with high CO Faraday efficiency (FE CO ) of 87.5 % and current density for the generation of carbon dioxide ( j CO ) of 10 mA cm −2 at −0.9 V vs RHE. ZAB-driven CO 2 RR had strong catalytic stability. These findings provide new methods and techniques for the preparation of advanced carbon-based catalysts from MOFs.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2023
·
IF 5.2
Yan Gao,Shumin Zhao,Miao Yan,Yongxia Li,Jianshe Zhao
In this work, the encapsulating peroxo-polyoxometalate in the mesoporous of metal-organic framework (MIL-101(Fe)) to synthesize composite according to the principle of host-guest matching. The structure of the host-guest composite was analyzed by a variety of methods, and the catalytic activity for desulfurization was investigated under mild conditions. The composites combine the advantages of peroxo-polyoxometalate (high efficiency) and MIL-101(Fe) (good recyclability and high porosity), showing synergistic effect between host and guest. The sulfur-containing organic compounds in simulated liquid fuel can be almost completely removed under the catalysis of PW 4 @MIL-101(Fe). The catalyst PW 4 @MIL-101(Fe) can be reused for 10 times without prominent decrease in desulfurization activity, indicating that it has good reusability due to the confinement effect between the window size of MIL-101(Fe) and molecular size of PW 4 . In addition, several control experiments and electron spin resonance experiment were researched to explore the possible mechanism, and the results show that the active component in the catalyst can promote the decomposition of H 2 O 2 into ·OH and thus accelerate the desulfurization reaction. This work discloses a facile and environmentally friendly method to prepare the "host-guest matching" catalyst with high activity and stable reusability, which provides ways for further developments in heterogeneous catalyst based on POM and MOF.
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PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2023
·
IF 7.8
Zezheng Lin,Yang Guo,Xiaoxuan Qu,Yuying Xiang,Shuwen Shen,Xin Zhu
Widely diffused pollution of endocrine disrupting chemicals (EDCs) has indeed threatened the safety of ecological environment and human health. A hydrangea-like Fe doped BiOBr (Fe-BiOBr) microsphere was synthesized and used to enhance the performance of UV/persulfate (PS) system using bisphenol A (BPA) as the targeted contaminant. The photochemical characterization of Fe-BiOBr showed that Fe doping markedly improved the separation efficiency of photoelectron and hole, and enhanced the utility rate of luminous energy of BiOBr. Degradation test demonstrated that with the assistance of Fe-BiOBr, the efficiency of UV/PS system was increased by 1.8 times, while 85.7% of BPA can be degraded within 10 min. Through scavenging experiments, sulfate radical (SO 4 •− ), superoxide radical (O 2 •− ), and hole were demonstrated as the dominate reactive species (RSs) in UV/Fe-BiOBr/PS system. Then, the role and mutual transformation of RSs was further clarified by radicals steady-state concentrations estimation and X-ray photoelectron spectroscopy (XPS) analysis. Based on the results, the produced O 2 •− can be subdivided into confined O 2 •− and free O 2 •− from the UV induced oxygen vacancy and photoelectron, respectively. Of which, SO 4 •− and confined O 2 •− were symbiotic via the redox cycle of Fe species. Significantly, only 2.6% of TOC can be simultaneously removed within 10 min treatment time, suggesting the incomplete degradation of BPA. For this, 16 organics was detected using LC-MS and the degradation route of BPA was also determined based on the intermediates analysis. Finally, the application possibility of the system was evaluated from the perspective of ecotoxicity by ECOSAR and T.E.S.T. softwares. This study investigates the dual effect of transition metal doped semiconductor on coupling system, and provides new insights into the role of O 2 •− .
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International Journal of Coal Preparation and Utilization
·
2023
·
IF 2.1
Xuexia Wang,Wencheng Xia,Yaoli Peng,Guangyuan Xie
Iron-assisted pyrolysis (Fe-assisted pyrolysis) is a high-efficiency technique to remove sulfur from low-rank coal. However, the sulfur removal mechanism of Fe-assisted pyrolysis did not compressively address. For filling this gap, this study explored the sulfur removal mechanism of diphenyl sulfone during Fe-assisted pyrolysis based on the factor optimization of desulfurization performance. The iron powder under the optimal conditions of Fe-assisted pyrolysis was characterized with X-ray diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS), showing that FeS and some FeS2 were formed on the surface of post-pyrolysis iron powder. Gas chromatography (GC) analysis manifested that the addition of iron powder in the pyrolysis process could considerably reduce the SO2 emission. GC and Fourier transform infrared spectrometer (FTIR) analyses demonstrated that there was C–S bond broken in the diphenyl sulfone structure during Fe-assisted pyrolysis. From the results of thermogravimetry-mass spectrometry (TG-MS), the addition of iron powder in the pyrolysis process could enhance the reaction rate and reduce the temperature required for the reaction. We believe that the results of the present study provided a theoretical basis for a profound understanding of the desulfurization mechanism of Fe-assisted pyrolysis.
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