CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Dongli Shang,Binze Zhang,Lijie Zhang,Jin Li,Yongtao Zhao,Yuhu Huang,Kaibin Tang,Changrong Xia
Perovskite oxide La 0.5 Sr 0.5 FeO 3-δ (LSF) is a potential Co-free electrocatalyst for oxygen reduction reaction (ORR) in solid oxide fuel cells (SOFCs). To improve its catalytic activity, this work performs multi-element doping to the A-site elements La and Sr, forming a high-entropy oxide Ba 0.2 Sr 0.2 La 0.2 Pr 0.2 Sm 0.2 FeO 3-δ (H-LSF) and a medium-entropy material Ba 0.35 Sr 0.35 La 0.1 Pr 0.1 Sm 0.1 FeO 3-δ (M−LSF). The multi-element doping effects are investigated on various physicochemical properties including crystalline structure, chemical compatibility with electrolyte, valence state of B-site Fe, amount of adsorbed oxygen species, oxygen nonstoichiometric value, sinterability, thermal expansion coefficient, electrical conductivity, chemical oxygen surface exchange coefficient ( k chem ), and electrochemical performance. While the multi-element doping does not change the phase structure and compatibility, it decreases the electronic conductivity, increases the oxygen vacancy concentration and k chem . Consequently, it improves ORR activity such as reduces interfacial polarization resistance and elevates peak power density. The best performance is observed with the medium-entropy perovskite rather than the high-entropy material. M−LSF shows k chem of 21.5 × 10 − 5 cm s −1 at 750 °C, 32 % higher than H-LSF and 4 times as high as LSF. In addition, M−LSF electrode exhibits interfacial polarization resistance of 0.090 2 at 750 °C, about 1/2 of H-LSF and 1/5 of LSF. Furthermore, single cell with M−LSF cathode demonstrates peak power density of 1.72 W cm −2 at 800 °C, 25 % higher than H-LSF and more than twice as LSF. Therefore, multi-element doping to the A-site of ferrite-based cobalt-free perovskite could be an effective method to improve the cathode performance.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Fei Qian,Liuyi Hu,Yonggen Jin,Linhe Li,Ruyi Fang,Jun Zhang,Xinping He,Yongping Gan,Yang Xia,Xinhui Xia,Wenkui Zhang,Hui Huang
All-solid-state lithium-sulfur batteries (ASSLSBs) with high theoretical energy have attracted much attention benefiting from fundamentally addressing the adverse shuttling effect. However, the development of stably operated ASSLSBs remains a great challenge due to the low conductivity and utilization of sulfur. Inspired by the polar single-atom catalyst with 100 % theoretical atomic utilization, a simple and effective strategy is proposed to improve the electrochemical performance of ASSLSBs by introducing Fe nanoparticles into the carbon host material (Ketjen black, KB). The in-situ grown Fe nanoparticles not only enhance the conductivity of the host material, but also promotes the conversion reaction of sulfur, resulting in the improvement of sulfur utilization and redox kinetics. Therefore, the initial discharge capacity of the assembled Fe-KB/S cell reaches 976 mA h g −1 at 50 mA g −1 , which is significantly higher than that of the KB/S cell (727 mA h g −1 ). Moreover, the Fe-KB/S cell maintains a reversible specific capacity of 520 mA h g −1 after 150 cycles, which is almost twice that of the KB/S cell. This study provides a valuable reference for the further development of ASSLSBs.
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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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FUEL
·
2024
·
IF 6.7
Xixi Chen,Ruxing Gao,Qiang Wang,Kehao Hu,Fenfen Wang,Chao Deng,Lujing Xu,Chundong Zhang,Ki-Won Jun,Seok Ki Kim,Tiansheng Zhao,Hui Wan,Guofeng Guan
Direct hydrogenation of CO 2 to liquid hydrocarbons via modified Fischer-Tropsch synthesis represents an appealing and sustainable route for efficient CO 2 utilization. However, the selective production of liquid hydrocarbons remains a significant challenge. In this work, we designed a series of carbon-coated K/Fe-C catalysts with various K loadings (ranging from 0 to 8 wt%) that enhance C 5+ hydrocarbon selectivity during CO 2 hydrogenation. It is found that the 4 K/Fe-C catalyst exhibits the highest C 5+ selectivity of 54.78 % at CO 2 conversion of 32.40 % and good stability within 100 h time-on-stream. This is attributed to the high dispersion of the Fe nanoparticles and the confinement effect of porous carbon matrix on the aggregation of Fe nanoparticles, resulting in high catalytic activity and selectivity. Meanwhile, the well dispersed K on the porous carbon matrix can reduce the particle size of Fe nanoparticles and promote the production of iron carbide active species for CO 2 -FTS, thus facilitating the selective formation of C 5+ hydrocarbons. Moreover, we also discussed a possible reaction mechanism for the direct hydrogenation of CO 2 to C 5+ hydrocarbons over the K/Fe-C catalysts. This study provides deep insights into the design of efficient Fe-C catalysts for converting CO 2 to liquid hydrocarbons.
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AQUA-Water Infrastructure Ecosystems and Society
·
2024
·Vol. 73
·期 5
·930-944
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IF 2.1
Ye Miaomiao,Song Lei,Chen Peng,Li Kexin,Zheng Kai,Zhang Tuqiao,Liu Xiaowei
View large Download slide View large Download slide Close modal The S(IV)–Fe(II)/PM pretreatment has demonstrated preliminary potential as an effective ultrafiltration (UF) pretreatment technology. However, a comprehensive understanding of its impact on UF membrane fouling control and the dynamic evolution of membrane fouling during prolonged operation is still lacking. In this study, a relatively prolonged fouling experiment was conducted. Results revealed that the S(IV)–Fe(II)/PM pretreatment exhibited superior performance over Al(III) coagulation pretreatment in mitigating the transmembrane pressure difference and addressing both reversible and irreversible membrane fouling. The application of a cluster analysis method to classify membrane fouling evolution stages further confirmed that S(IV)–Fe(II)/PM pretreatment effectively decelerated the rate of membrane fouling evolution. The surface cake layer of UF membranes pretreated with S(IV)–Fe(II)/PM exhibited greater looseness and smoothness. It also showed better results than Al(III) coagulation pretreatment in reducing the accumulation of organic foulants, controlling the Si content and reducing the total microorganisms and live microorganisms in the UF feed water. Variance Partitioning Analysis indicated that the combined contribution of organic, inorganic, and biological foulants was the most significant for UF membranes after S(IV)–Fe(II)/PM pretreatment (50.4%) and UF membranes after Al(III) coagulation pretreatment (70.2%). These findings underscore the efficacy of S(IV)–Fe(II)/PM pretreatment in controlling UF membrane fouling under prolonged operation. S(IV)/Fe(II)/PM pretreatment efficiently mitigated UF membrane fouling during long-term operation. S(IV)/Fe(II)/PM pretreatment yielded a long uncontaminated stage and accelerated contaminated stage. S(IV)/Fe(II)/PM pretreatment suppressed the contribution of organic–inorganic–biological composite fouling.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Yan Jiao,Shaoqing Wang,Boyang Sun,Yu Han,Zilu Zhang,Xiuli Shen,Zhihe Li
The efficient removal and degradation of microplastics are critical for protecting aquatic ecosystems. Herein, Fe-modified magnetic biochar (MBC) was synthesized as an adsorbent for removing microplastics in water. The effects of lignin/Fe salt mass ratios, adsorbent amount, adsorption time, adsorption temperature, solution pH, and presence of coexisting anions on adsorption efficiency were investigated. The thermal degradation behaviour and recycling characteristic of microplastics was also explored. Results showed that MBC has a developed pore structure, superparamagnetic property, and abundant oxygen-containing functional groups. The removal efficiency of polystyrene microplastics using MBC-11 was 99 %, with an adsorption capacity of 68.57 mg/g, which was 25 times higher than that of unmodified lignin biochar. The kinetics of the adsorption process followed the pseudo-first kinetic model, and the equilibrium data best fitted the Freundlich model. Thermodynamic results confirmed that adsorption over MBC was a spontaneous, heat-absorbing, and entropy-increasing process. The adsorption mechanism of PS by biochar was mainly via electrostatic and hydrophobic interactions and pore throttle. The thermal-degradation products of PS were mainly hydrocarbons, including styrene, benzene, and toluene, owing to the enhanced β-scission, H-shift, and methylation reactions at MBC catalytic sites. This study provides a scientific basis for the development of control technologies for microplastics removal in water.
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Small
·
2024
·
IF 13
Ziyi Xu,Shihao Wang,Wenmao Tu,Ling Shen,Lu Wu,Shilong Xu,Haining Zhang,Hongfei Pan,Xiao-Yu Yang
Stable, efficient, and economical bifunctional electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are needed for rechargeable Zn–air batteries. In this study, a directional electron transfer pathway is exploited in a spatial heterojunction of Co y Ni x @Fe─N─C heterogeneous catalyst for effective bifunctional electrolysis (OER/ORR). Thereinto, the Co/Ni alloy is strongly coupled to the Fe─N─C support through Co/Ni─N bonds. DFT calculations and experimental findings confirm that Co/Ni─N bonds play a bridging role in the directional electron transfer from Co/Ni alloy to the Fe─N─C support, increasing the content of pyridinic nitrogen in the ORR-active support. In addition, the discovered directional electron transfer mechanism enhances both the ORR/OER activity and the durability of the catalyst. The Co 0.66 Ni 0.34 @Fe─N─C with the optimal Ni/Co ratio exhibits satisfying bifunctional electrocatalytic performance, requiring an ORR half-wave potential of 0.90 V and an OER overpotential of 317 mV at 10 mA cm −2 in alkaline electrolytes. The assembled rechargeable zinc–air batteries (ZABs) incorporating Co 0.66 Ni 0.34 @Fe─N─C cathode exhibits a charge–discharge voltage gap comparable to the Pt/C||IrO 2 assembly and high robustness for over 60 h at 20 mA cm −2 .
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PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Wenqing Han,Yehai Yan,Huifang Wang,Jinzhong Li,Ping Zhao,Zhihao Liu,Fei Yu,Jian Cui,Guangfa Zhang
Solar-driven interfacial water evaporation has become one of the most promising approaches to effectively harvesting freshwater, yet the fabrication of high-performance and multifunctional solar interfacial evaporators (SIEs) still remains a huge challenge to date. In this study, a multifunctional MXene and Fe-MOF@cellulose acetate/polyvinylpyrrolidone (MXM@CP) SIE was prepared via a facile “electrospinning and suction filtration deposition” coupling strategy. Thanks to the incorporation of MXene, MXM@CP displayed excellent photothermal conversion performance. Together with the fast water transport channel provided by the porous cellulose acetate electrospinning substrate, a remarkable solar-driven water evaporation property was achieved for MXM@CP, showing a higher water evaporation rate of 1.1 kg m–2 h–1 under one sun irradiation. Moreover, the resultant composite film also exhibited excellent Fenton catalytic activity to effectively degrade volatile organic compounds (VOCs) due to the synergistic effect of the MXene and Fe-based MOF (Fe-MOF). Particularly, a relatively higher degradation rate of 82.8% was acquired for the resulting evaporator toward the benzene contaminant. These results provide new insights into the construction of high-performance and multifunctional SIEs toward clean freshwater collection from the VOC-contaminated water system.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Li-Zhi Huang,Xiang Zhan,Weiguo Chen,Changye Li,Liandong Zhu,Yitao Dai,Jia Deng
Carbon tetrachloride (CT), a common persistent pollutant in groundwater, has attracted widespread attention from environmental researchers. The dechlorination from CT to combustible hydrocarbons not only represents the removal of contaminants, but also offers the possibility of recovering carbon resources from water. In this work, we used the coprecipitation of Fe(II) and Pd(II) to synthesize Pd-Fe hydroxides for the dechlorination of CT. When Pd and Fe dosages were 0.4 and 5 mM respectively, CT with 26 µM concentration can be fast removed within 5 min, and 43.3 % of CH 4 and 11.6 % of C 2 H 6 (mol%) were generated after 110 min. The alkaline condition was more conducive to the complete dechlorination of CT comparing with acidic and neutral conditions. During the olation process, Fe(II) as electron donor transferred electrons to Pd(II) to form Pd(0) clusters. Pd(0) active sites act on the binding of CT and transfer electron to H + /H 2 O to form adsorbed atomic hydrogen (H ads •). The adsorbed CT molecules on the surface of Pd-Fe hydroxides undergo continuous dechlorination to form CH 4 and C 2 H 6 through the attack of H ads • and direct electron transfer. In real groundwater applications, CT was rapidly removed, with CH 4 and C 2 H 6 yields reaching 24.5 % and 4.6 % (mol%), respectively. Encouragingly, incomplete dechlorinated products, including chloroform and dichloromethane, did not show signs of subsequent rebound even after 60 min. Furthermore, Pd-Fe hydroxides also exhibit resistance to the oxidation effects of dissolved oxygen, which demonstrates the promising application prospects.
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Surfaces and Interfaces
·
2024
·
IF 5.7
Yitong Guo,Yukai Chang,Libo Wang,Qixun Xia,Aiguo Zhou
In this work, two−dimensional Mo 2 CT x MXene pillared with transition metal complexes [Fe(III), Co(III), or Ni(II)] was prepared, which shows ultra−high performance as the anode of lithium−ion batteries (LIBs). Firstly, Mo 2 CT x was pretreated with hexadecyl trimethyl ammonium bromide (CTAB) as a surfactant and then mixed with hydrated chloride (FeCl 3 ·6H 2 O, CoCl 2 ·6H 2 O, or NiCl 2 ·6H 2 O) at room temperature. The molar ratio of MXene to hydrated chloride was 1:1. In this process, metal ions (Fe 3+ , Co 2+ , or Ni 2+ ) were successfully loaded on the nanosheets of Mo 2 CT x . The ions were combined with the surface terminated oxygen of MXene to form transition metal complexes by liquid phase agitation method. Moreover, transition metal complexes contribute a portion of their capacity and help Mo 2 CT x enhance its own capacity to a large extent. However, the electrochemical effects on Mo 2 CT x vary depending on the type of transition metal ions. As anodes of LIBs, the final discharge specific capacities after 100th cycles at 2 A g −1 were 511.68 mAh g −1 , 229.22 mAh g −1 and 78.19 mAh g −1 for Fe(III)@Mo 2 CT x , Co(III)@Mo 2 CT x , and Ni(II)@Mo 2 CT x , respectively, while the capacity of pure Mo 2 CT x after delamination was only 31.17 mAh g −1 . At 6 A g −1 , the final discharge capacity of Fe(III)@Mo 2 CT x was 227.4 mAh g −1 after 500th cycles. Therefore, Mo 2 CT x MXene pillared by the complexes, especially Fe(III) complexes, is a promising anode material with high−performance for lithium−ion batteries.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yanni Jiang,Zhongjuan Wang,Jianbo Huang,Feng Yan,Ye Du,Chuanshu He,Yang Liu,Gang Yao,Bo Lai
Singlet oxygen ( 1 O 2 ) is an effective reactive oxygen species in disinfection due to its long lifetime and sensitivity to bacteria. This study tried to develop a 1 O 2 dominated process for bacterial inactivation by visible light (vis) photocatalysis assisted by PMS. A novel CuS-modified MIL-101(Fe) (CSMF) photocatalyst was synthesized for the first time. Compared with MIL-101(Fe), CuS-modified MIL-101(Fe) enhanced the photocatalytic performance by increasing absorption of visible light, narrowing down the bandgap and promoting photo carrier separation efficiency. 7.5-log Gram-negative Escherichia coli (E. coli) could be inactivated by Vis/CSMF/PMS system within 40 min, showing much better performance of 3.5-log E. coli inactivated by Vis/PMS system. The Vis/CSMF/PMS system is applicable in a broad pH range from 3.0 to 9.0, remaining quite steady disinfection efficiency after regenerations of the catalyst. Quenching experiments and electron paramagnetic resonance (EPR) analysis demonstrated 1 O 2 was the dominated ROS rather than OH • and SO 4 •− . Three pathways, including photo-generated electrons (e − ) and O 2 dependent pathway, photo-generated holes (h + ) dependent pathway and CSMF enhanced PMS dissociation pathway, were evidenced to responsible for 1 O 2 formation by aeration experiments and specific 1 O 2 fluorescence probe. 1 O 2 in water attacked the bacterial cell membranes first, got inside the cell and up-regulated the level of intracellular ROS, which further led to cell membrane damage and DNA degradation so as to irreversible cell death. In addition, the developed Vis/CSMF/PMS system could also efficiently inactivate gram-positive bacteria Staphylococcus aureus and fecal coliform bacteria in practical wastewater, suggesting its wide applicability as a promising alternative to conventional disinfection process.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Gang Li,Ruiyang Tan,Bohong Gao,Xinli Liu,Mingyuan Zhang,Ping Chen,Xinyi Wang
Developing advanced electromagnetic wave absorption (EMWA) materials is crucial for curbing electromagnetic pollution. This study presents the synthesis of core–shell Fe/Fe 3 O 4 /C composites, FFC-700 and FFC-800, derived from Prussian blue@covalent organic framework (PB@COF) via pyrolysis at 700 and 800 °C, and the hollow FFC-900 at 900 °C. Their chemical compositions, microstructures, and EMWA performances were thoroughly examined. FFC-700 and FFC-800, featuring core–shell structures and abundant interfaces, facilitate electron transfer and enhance polarization effects. Notably, FFC-700 achieved a minimum reflection loss (RL min ) of − 75.82 dB at an ultrathin thickness of 1.45 mm, with an effective absorption bandwidth (EAB) of 6.22 GHz at 1.66 mm, spanning the entire Ku-band. FFC-800 also provides substantial EMWA performance, with an RL min of − 30.14 dB at 1.61 mm and an EAB of 6.08 GHz at 1.67 mm, also covering the Ku-band. Radar cross-section (RCS) simulations reveal the absorbers’ exceptional radar stealth, with their coatings significantly reducing RCS values. The composites’ adjustable structure, balanced composition, and dielectric-magnetic synergy optimize impedance matching for full-Ku-band coverage. This work offers a promising approach to fabricating efficient EMWA materials from PBA@COF and MOF@COF precursors.
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危险品化学品经营许可证（带存储）