SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Kecheng Wen,Shijin Zhang,Yanting Zhang,Xinyu Wang,Zhiwei Yang,Guozhong Zheng,Yuan Huang,Jinhui Xu,Jing Zhang
Performance enhancement of Fe-C materials for Cu 2+ removal, removal capacity, and pH range of applicability is achieved through the environmentally friendly, long-lasting magnetic fields in this study. Specifically, the utilization of the magnetic field to the Fe-C materials significantly improves the performance of Cu 2+ removal in contrast to the single Fe-C, which also brings about improvement under various water condition parameters. The concentrations of Cu 2+ , Cu + , Fe 2+ and Fe 3+ in solution were monitored, and the relevant properties of Fe-C materials were characterised. Results showed that Cu 2+ was removed by reduction of Fe-C material either in solution or after adsorption onto the surface of the material. Additionally, the magnetic field accelerated the exposure of the active sites present in the material, leading to the acceleration of adsorption of Fe-C to Cu 2+ for reduction and removal, as well as accelerating mass transfer. In addition, the magnetic field facilitated Fe-C materials' active sites and expedited the adsorption of Fe-C onto Cu 2+ for reduction and removal, as well as accelerated mass transport. Furthermore, it was verified that MF maintained a positive reinforcing impact on the Fe-C micro-electrolysis system for eliminating other heavy metal ions, with a particular emphasis on paramagnetic heavy metal ions. This research has expanded our understanding of the mechanism underlying Fe-C/MF micro-electrolysis system, and aided in the application in Fe-C/MF micro-electrolysis system for the remediation of heavy metal ions present in water environment.
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高影响因子
Small
·
2025
·
IF 12.1
Hui Luo,Lingxin Kong,Sihai Lv,Qifan Li,Mi Tang,Xujin Ge,Fu Chen,Yongzhi Cheng,Xiangcheng Li
The rational manipulation of interfacial properties, composition, and morphology of materials has emerged as an effective strategy for enhancing their microwave absorption performance. The crystal phase composition, microstructure, and electromagnetic properties can be regulated by varying the thermal treatment temperature. The synergistic integration of heterogeneous interfaces, magnetic materials, microstructures, and defect engineering helps optimize impedance matching and enhance polarization and magnetic losses. Herein, multi-interface core–shell FeSiAl@MnO x @C composites with various morphologies demonstrated superior microwave absorption performance. A minimum reflection loss of −56.3 dB is achieved at an absorber thickness of 1.41 mm, and effective absorption bandwidth of 5.0 GHz is obtained at a thickness of 1.59 mm. The radar cross-section reduction value reached 19.448 at an incidence angle of 0°. The excellent microwave absorption performance is due to the synergistic effect of the significant magnetic and dielectric losses and improved impedance matching. This study establishes a foundation for designing next-generation high-performance microwave-absorbing materials with high magnetic losses.
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PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2024
·
IF 7.7
Min Zhang,Jin Wang,Xinyuan Zhan,Wusong Xu,Maolin He,Ding Ma,Zhengbo Yue
Thiocyanate (SCN − ), a non-volatile inorganic pollutant, is commonly found in various types of industrial wastewater, which is resistant to hydrolysis and has the potential to be toxic to organisms. Premagnetized iron-copper-carbon ternary micro-electrolytic filler (pre-Fe/Cu/C) was prepared to degrade SCN − . Pre-Fe/Cu/C exhibited the most significant enhancement effect on SCN − removal when magnetized for 5 min with an intensity of 100 mT, and the SCN − removal rate was the highest at an initial pH of 3.0 and an aeration rate of 1.6 L/min. The electrochemical corrosion and electron transfer in the pre-Fe/Cu/C system were confirmed through SEM, XPS , FTIR , XRD , and electrochemical tests. This resulted in the formation of more corrosion products and multiple cycles of Fe 2+ /Fe 3+ and Cu 0 /Cu + /Cu 2+ . Additionally, density functional theory (DFT) calculations and electron paramagnetic resonance (EPR) were utilized to illustrate the oxygen adsorption properties of the materials and the participation of reactive oxygen species ( 1 O 2 , ·O 2 − , and ·OH) in SCN − removal. The degradation products of SCN − were identified as SO 4 2− , HCO 3 − , NH 4 + , and N 2 . This study introduced the use of permanent magnets for the first time to enhance Fe/Cu/C ternary micro-electrolytic fillers, offering a cost-effective, versatile, and stable approach that effectively effectively enhanced the degradation of SCN − .
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高影响因子
ACS Applied Materials & Interfaces
·
2024
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IF 8.3
Yang Nan,Tianpeng Liu,Wenhao Liu,Dong Cao,Daojian Cheng
Constructing highly active and noble metal-free electrocatalysts is significant for the anodic oxygen evolution reaction (OER). Herein, uniform carbon-coated CoP nanospheres (CoP/C) are developed by a direct impregnation coupling phosphorization approach. Importantly, CoP/C only takes a small overpotential of 230 mV at the current density of 10 mA cm–2 and displays a Tafel slope of 56.87 mV dec–1. Furthermore, the intrinsic activity of CoP/C is 21.44 times better than that of commercial RuO2 under an overpotential of 260 mV. In situ Raman spectroscopy studies revealed that a large number of generated Co–O and Co–OH species could facilitate the *OH adsorption, effectively accelerating the reaction kinetics. Meanwhile, the carbon shell with a large number of mesoporous pores acts as the chainmail of CoP, which could improve the active surface area of the catalyst and prevent the Co sites from oxidative dissolution. This work provides a facile and effective reference for the development of highly active and stable OER catalysts.
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高影响因子
Small
·
2024
·Vol. 20
·期 50
·2406489
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IF 13
Yijun Gao,Shanshan Song,Fei He,Xianglong Kong,Zhong Xiao,Xianchang Cui,Linbo Cao,Yumeng Zhang,Zhiliang Liu,Piaoping Yang
Silicon (Si) has attracted considerable attention as a promising alternative to graphite in lithium-ion batteries (LIBs) because of its high theoretical capacity and voltage. However, the durability and cycling stability of Si-based composites have emerged as major obstacles to their widespread adoption as LIBs anode materials. To tackle these challenges, a hollow core–shell dodecahedra structure of a Si-based composite (HD-Si@C) is developed through a novel double-layer in situ growth approach. This innovative design ensures that the nano-sized Si particles are evenly distributed within a hollow carbon shell, effectively addressing issues like Si fragmentation, volume expansion, and detachment from the carbon layer during cycles. The HD-Si@C composite demonstrates remarkable structural integrity as a LIBs anode, resulting in exceptional electrochemical performance and promising practical applications, as evidenced by tests in pouch-type full cells. Notably, the composite shows outstanding cycling stability, retaining 85% of its initial capacity (713 mAh g −1 ) even after 3000 cycles at a high current rate of 5000 mA g −1 . Additionally, the material achieves a gravimetric energy density of 369 W h kg −1 , showcasing its potential for efficient energy storage solutions. This research signifies a significant step toward realizing the practical utilization of Si-based materials in the next generation of LIBs.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Rongcong Li,Liu Yang,Ruizhi Li,Yingke Zhou
Carbon modified nitrogen-doped Fe 3 O 4 (N–Fe 3 O 4 @C) nanorod array directly grown on carbon cloth was fabricated. Nitrogen-doping and carbon shell effectively decrease the potential barrier of ion migration of the oxides and improve the electrochemical performance. An enhanced donor density of N-Fe 2 O 3 (7.6 × 10 15 cm −3 ) is achieved with optimized doping temperature. Following with carbon coated, the optimized N–Fe 3 O 4 @C electrode showed ultrahigh capacitance over an extended potential window and remarkable cycling performance. A new quasi-solid-state supercapacitor with N–Fe 3 O 4 @C and NiCoP@Ni(OH) 2 achieved high voltage to 2.0 V and high energy density (72.37 Wh kg −1 , 2.36 mWh cm −3 ).
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高影响因子
Frontiers in Pharmacology
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2017
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IF 4.4
Liu Qing,Xiao Xu-Hui,Hu Liu-Bing,Jie Hui-Yang,Wang Ying,Ye Wen-Cai,Li Man-Mei,Liu Zhong
Anemone flaccida Fr. Schmidt (Ranunculaceae) (Di Wu in Chinese) is used to treat punch injuries and rheumatoid arthritis (RA). Our previous report has shown that crude triterpenoid saponins from Anemone flaccida exhibited anti-arthritic effects on type II collagen-induced arthritis in rats. Furthermore, anhuienoside C (AC), a saponin compound isolated from A. flaccida, was observed to suppress the nitric oxide production in lipopolysaccharide (LPS)-treated macrophage RAW 264.7 cells. In this study, we examined the effects of AC on the prevention and treatment of collagen-induced arthritis in a mouse model and evaluated the potential mechanisms involved. We observed that oral administration of AC significantly suppressed the paw swelling and arthritic score, decreased the body weight loss, and decreased the spleen index. Improvement in the disease severity was accompanied by the reduction of cluster of differentiation 68 (CD68)-positive cells in the ankle joint and inhibition of the pro-inflammatory cytokine tumor necrosis factor alpha (TNF-α) in the synovium of the joint. Mechanistic studies indicated that AC exerted its anti-inflammatory activity by inhibiting the mRNA expression levels of inducible nitric oxide synthase, cyclooxygenase-2, TNF-α, interleukin (IL)-1β, and IL-6 and by suppressing the production of inflammatory cytokines such as TNF-α, IL-1β, and IL-6 in LPS-treated RAW 264.7 cells. AC also blocked the LPS-induced activation of the extracellular signal-regulated kinase, c-Jun N-terminal kinase, and p38 mitogen-activated protein kinase pathways. Additionally, the LPS-induced activation of nuclear factor kappa-B (NF-κB) was significantly suppressed by AC treatment, as indicated by down-regulation of TLR4 and inhibition of the nuclear translocation of NF-κB p65 and by activation and degradation of the inhibitor of kappa B. These findings indicated that AC has a great potential to be developed as a therapeutic agent for human RA.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2024
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IF 4.1
Haiping Lei,Tianwei Wei,Jiguo Tu,Yiwa Luo,Suqin Li,Shuqiang Jiao
NiO possesses a high theoretical capacity, but its poor conductivity and significant volume changes during the redox process lead to severe electrochemical performance degradation, limiting its applications. In this study, flower-like structure NiO@C composite materials were synthesized via a hydrothermal method. The particle size of the material is approximately 10–16 μm, with a well-defined morphology of carbon material composite. Al-NiO@C batteries were constructed using NiO@C cathode and subjected to electrochemical performance testing. The initial discharge capacity of NiO@C composite material at a current density of 200 mA g −1 is 126 mA h/g, and even after 150 cycles, it retains a discharge specific capacity of 54 mA h/g. In contrast, the pure NiO exhibits an initial capacity of only 49 mA h/g, which decreases to 23 mA h/g after 150 cycles. The cycling stability of NiO@C material is significantly better than that of NiO alone. This improvement is attributed to the enhanced conductivity of NiO material by the addition of carbon material, which provides improved electron/ion transport properties. Additionally, the inclusion of carbon material helps alleviate the volume changes of NiO during the reaction process, thereby enhancing the overall electrochemical performance of Al-NiO batteries.
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CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Xiaomei Li,Linfeng Fu,Lin Cao,Lihui Lei,Xinxing Zhan,Changgang Hu,Xin Tong,Juan Tian
Ordered platinum intermetallic alloys, due to their structured chemical composition and high activity, have been considered as one of the ideal electrocatalysts for fuel cells. Ensuring the controlled structure of alloy nanoparticles (NPs) is a prerequisite for obtaining highly active platinum-based alloy catalysts. In this study, we employed different pH adjusters to modulate the crystallization of Pt alloy NPs in catalysts. By balancing the competition between precipitation and complexation reactions in the solution, the size and structure of platinum alloy particles can be effectively adjusted. Utilizing NH 3 ·H 2 O as a pH adjuster, we synthesized an ordered PtCu 3 alloy catalyst with a particle size of 3.3 nm. This catalyst exhibits a half-wave potential of 0.945 V and a mass activity of 1.061 mA µg Pt –1 , which is 11.7 times higher than that of commercial 20 % Pt/C (TKK). This enhancement in catalytic activity is attributed to the introduction of transition metal copper atoms into the catalyst, forming an ordered intermetallic structure that induces compressive strain. This strain lowers the d-band center, weakens the adsorption of oxygen-containing intermediates, which strengthen catalytic activity. Therefore, by adjusting the morphology of metal precursors to improve the microstructural form and state of the catalyst, the oxygen reduction activity can be significantly enhanced.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 17
·7639-7645
·
IF 2.7
Qianxi Wang,Yuyu Dai,Xueli Hong,Yunyang Hong,Rui Zhang,Xinhuan Yan
Non-precious metal catalysts play a significant role in the field of hydrogenation. This study synthesized Co-BTC from cobalt nitrate hexahydrate and 1,3,5-tricarboxylic acid benzene. By changing the calcination temperature of Co-BTC in an inert atmosphere, a series of novel non-precious metal Co/C microsphere catalysts were successfully prepared. The composition and structure of the Co/C-n catalysts were characterised by FESEM, TEM, XRD, IR, XPS and BET. These results confirm that 1,3,5-benzenetricarboxylic acid provides a rich carbon matrix and metallic Co nanoparticles are generated by self-reduction on the carbon matrix. The graphite matrix formed during the calcination process has a rich pore structure and good dispersion of active components on the catalyst surface, which is very favourable for the catalytic reaction. In the hydrogenation of o-chloronitrobenzene (o-CNB) to o-chloroaniline (o-CAN), the Co/C-500 catalyst showed the best catalytic performance. At 80 °C and 2 MPa H2 for 60 minutes, the conversion rate of o-CNB reached 99% and the selectivity reached 99%. When the reaction takes 5 minutes, the conversion rate reaches 10.5%, and the TOF value reaches 36.3 h−1. The Co/C-500 catalyst can be easily recycled and reused after reaction with the help of a magnetic field. Moreover, this catalyst is also effective in the selective hydrogenation of other nitroaromatic hydrocarbons containing halogen or unsaturated groups to corresponding aniline. This simple and direct synthesis method may lead to the economic production of large-scale Co/C catalysts, which is an attractive prospect for the industrial trial production of corresponding aniline.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Yao Shen,Ke Wang,Lu Li,Jingkai Zhao,Jiexu Ye,Ping Chen,Xiang Gao,Shihan Zhang
Catalyst-aided CO 2 desorption offers a promising reduction in the energy penalty of amine scrubbing, but faces the challenges of slow mass transfer, sluggish desorption kinetics, and susceptibility to deactivation. In this work, a hollow composite catalyst C@ZrO 2 was developed to simultaneously realize rapid electron, proton and mass transfer for CO 2 desorption via facilitating proton-coupled electron transfer (PCET) effect. The CO 2 desorption rate of benchmark MEA solution increased by 126% and relative heat duty decreased by 69.9% in presence of C@ZrO 2 , and its catalytic performance didn’t noticeably decline after 10 cycles. Additionally, the desorption rate of biphasic solvents with a high viscosity increased by 112% and relative heat duty decreased by 57.3% with C@ZrO 2 . Based on theoretical calculation, the facilitated PCET efficiency of carbon layer increased the binding energy of carbamate to enhance its mass transfer rate from the liquid phase to the C@ZrO 2 surface, and stretched the C-N bond to reduce the proton transfer energy barrier by 66.8%. This work provided a novel insight to design catalysts for energy-efficient and stable CO 2 capture.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
·
IF 5.8
Jiangtao Ma,Yujun Zhu,Kai Huang,Peng Wang,Dinghua Liu,Yupei Zhao
In recent years, high-entropy alloy materials have garnered widespread attention in the field of water electrolysis catalysts, owing to their exceptional electrochemical performance . However, synthesizing efficient and highly stable catalysts remains a formidable challenge. This study presents the preparation of a highly stable FeCoNiCuMo/C high-entropy alloy catalyst , exhibiting an overpotential of 324 mV at a current density of 10 mA·cm −2 in a 1.0 M KOH solution, comparable to commercial RuO 2 . The Tafel slope reaches 70.5 mV·dec −1 , and the charge transfer resistance is only 3.6Ω, demonstrating outstanding electrochemical performance. Furthermore, stability tests conducted over 72 h indicate the excellent stability of the prepared high-entropy alloy catalyst, with only a slight deviation observed after 5000 cycles of accelerated durability experiments. Theoretical calculations show that due to lattice distortion and cocktail effect, the d-band center of FeCoNiCuMo/C moves away from the Fermi surface compared to the pure component, which attenuates the adsorption of the reaction intermediates and leads to a significant decrease in the oxygen evolution reaction overpotential. This study validates the potential for long-term, efficient, and stable operation of high-entropy alloys as water electrolysis catalysts, providing experimental support for expanding the application scope of HEA.
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