CERAMICS INTERNATIONAL
·
2025
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IF 5.6
Junyi Lv,Houbo Xie,Jingzhe Zhang,Guodong Yang,Tao Li,Jinbo Wu,Faliang Li,Haijun Zhang
Ti 3 AlC 2 , notable for its distinctive combination of metallic and ceramic properties, has attracted significant attention. The rapid synthesis of Ti 3 AlC 2 powders is crucial for mass production. In this study, Ti 3 AlC 2 powders with 85 wt% purity were synthesized efficiently using selective laser melting method, utilizing titanium powder, aluminum powder and titanium carbide particles as starting materials. This innovative method reduces synthesis time by a factor of approximately 30–240 compared to traditional heating techniques. Moreover, the apparent oxidation activation energy ( E ) and the pre-exponential factor of the synthesized Ti 3 AlC 2 were calculated as 53.86 kJ/mol and 12.74, respectively. Additionally, a powder composition containing 45 wt% Ti 3 AlC 2 exhibited a maximum reflection loss of −21.5 dB at 8.2 GHz with a thickness of 2.5 mm, achieving effective electromagnetic wave absorption in the frequency range of 7.4 GHz–9.4 GHz.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
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IF 5.8
He Sun,Jiaming Chen,Yusheng Yang,Min Qiu,Milin Zhang
A low-grade ore containing 4 % niobium and 7 % titanium has been extracted from Bayan Obo tailing, but its potential has not been fully utilized. This study aims to recover the niobium and titanium elements from this low-grade ores in the form of their carbides. The process involves reducing niobium and titanium to (Nb,Ti)C through a carbothermal process. During this process, iron and silicon are also reduced to Fe-Si intermetallic compounds, allowing (Nb,Ti)C to diffuse into them. Subsequently, selective electrochemical oxidation is used to separate (Nb,Ti)C from the Fe-Si intermetallic compounds in an aqueous ferrous sulfate solution. The Fe-Si intermetallic compounds are first oxidized to the Fe 3 Si phase, and then to the Fe 5 Si 3 phase in the solution with pH 0.35. The (Nb,Ti)C/matrix interfaces are identified as the preferred site of electrochemical pitting corrosion. By exploiting the electrochemical oxidation reaction of iron in the matrix, (Nb,Ti)C powders are separated along these interfaces. The by-products of this process are FeSi alloys, which are evaluated for their electrocatalytic properties in oxygen evolution reactions. It is found that the Fe 5 Si 3 alloy by-product exhibits good electrocatalytic activity and kinetics in the oxygen evolution reaction, demonstrating its potential for practical applications.
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GREEN CHEMISTRY
·
2024
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IF 9.3
Hao Huang,Guangping Zhou,Min Zhuang,Xiaolan Cai,Shaoqu Xie
Bioenergy is a key strategy for sustainability, yet the potential for biofuel production from chitin is under-exploited. Here, we report the cleavage of the inherently inert σ-type C-C bonds in chitin under the condition of initially breaking the unstable C-O bonds. Mechanistic studies indicate that by regulating the valence state of Ru and the interaction between RuOx and AC-HNO3-melamine, the ability of Ru nanoparticles to cleave C-C and C-O bonds can be controlled. One-pot sequential hydrogenolysis of chitin with RuOx/AC-HNO3-melamine resulted in a mixed alcohol yield 1.66 times that of commercial Ru/C. A mixed alcohol yield of 16.8% was achieved using raw chitin and green process conditions. We expanded the substrate range to include chitosan, N-acetyl-D-glucosamine, and glucosamine. This work demonstrates the potential of marine biomass to produce affordable clean energy.
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MICROCHEMICAL JOURNAL
·
2025
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IF 5.1
Jie Wang,Yuan-Yuan Zhang,Dan Liu,Chen-Chun Zhong,Ya-Hui Hu,Fei Zhao,Hong-Li Guo,Feng Chen
The balance of oxalic acid in the body is intricately regulated. Importantly, elevated levels of oxalic acid in urine or blood have been linked to the progression of various diseases. There is strong interest in developing efficient methods to quantify oxalic acid in various bio-matrices like urine. However, due to its small molecular weight, high polarity, acidic nature, and endogenous properties, establishing an analysis method based on liquid chromatography-electrospray ionization tandem mass spectrometry (LC-ESI-MS/MS) for oxalic acid presents significant challenges, and such analysis methods that meet clinical needs are not widely available. Faced with the aforementioned challenging issues, in this study, we have discovered innovative strategies to improve the ionization, chromatographic separation, and enrichment of oxalic acid and its internal standard, leading to the successful LC-MS/MS method development and clinical application of the analysis method. These include: (1) simultaneous use of two low concentrations of electrolytes (NH 3 ·H 2 O and NH 4 Ac) in the mobile phase; (2) alkalinization of urine; (3) addition of 0.3 % NH 3 ·H 2 O to the internal standard oxalic acid-1,2- 13 C solution; (4) selection of ultrapure water (UPW) as an alternative matrix; (5) urine sample processing using an easy-to-use protein precipitation method. These measures have created a relatively homogeneous alkaline environment, addressing the issues in the ionization, chromatographic separation, and enrichment of oxalic acid and its internal standard. Of note, chromatographic separation of oxalic acid and oxalic acid-1,2- 13 C was achieved on the Waters Symmetry C18 column (4.6 mm × 50 mm, 3.5 μm) with an isocratic elution at a flow rate of 0.40 mL/min. The target analyte was completely separated by elution with 30 % acetonitrile containing 0.01 % NH 3 ·H 2 O and 1 mM NH 4 Ac for 3 min, without any endogenous interference. The method showed good linearity over the 0.020–50.0 μg/mL concentration range with a correlation coefficient r 2 = 0.9998. The intra-assay and inter-run precision and accuracy, recovery, and stability of the method were all within the acceptable parameters. Collectively, this study developed and validated a simple, fast, and sensitive LC-ESI-MS/MS method that did not require complex derivatization, acidification, large-volume sample consumption. Moreover, this method was successfully applied for routine urinary oxalic acid detection in children with kidney disease, providing valuable information for clinicians.
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ACS Applied Polymer Materials
·
2024
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IF 4.4
Yunpeng Liu,Sijie Cheng,Shree Kesavan Kannan,Panpan Zhang,Rajaram S. Sutar,Bairu Shi,Shanhu Liu
Heavy oil spill recovery is a global challenge because of its high viscosity and low fluidity. Herein, we demonstrated a method to develop a solar and Joule heating superhydrophobic carbon black/polyvinyl formal sponge (S-CB/PVFM) for cleanup of highly viscous crude oil. At an optimal amount of CB (200%) in polyvinyl formal, S-CB/PVFM revealed a highly porous sponge-like structure. The as-prepared sponge can effortlessly separate light and heavy oils from an oil–water mixture. The surface temperature of S-200% CB/PVFM increased to 77 °C under exposure to 1 kW m–2 of light intensity and 154 °C by applying a voltage of 12 V, causing the viscosity of the crude oil to decrease and allowing it to be absorbed quickly. In the continuous crude oil cleaning process, the as-prepared sponge revealed a crude oil collection rate of 0.600 g/min and 4.954 g/min under photothermal and electrothermal heating, respectively. The results indicate that this approach can effectively reduce viscosity and recover crude oil in unfavorable weather conditions. Using cost-effective CB and advanced PVFM technology, we have created a large-scale sample (18 cm diameter) to cleanup oil spills in vast areas, providing hope for a cleaner and more sustainable future.
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ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Kui Yan,Ruixin Chen,Qi Ling,Ziwei Zhao,Zihan Zhou,Xuan Li,Jianguo Lv,Chunbin Cao,Gang He,Zhaoqi Sun,Miao Zhang
This research presents an innovative approach to the in-situ fabrication of Mn-doped NiFe 2 O 4 (Mn-NiFe 2 O 4 ) nanosheet arrays directly on nickel foam substrates. The formation of precursors on the nickel foam substrates is achieved through spontaneous corrosion, followed by a thermal treatment to form the Mn-NiFe 2 O 4 nanosheet arrays. The material's structure and morphology were thoroughly examined, revealing that the addition of Mn transforms the nanoporous structure on the nickel foam into a nanosheet structure. The average thickness of the nanosheets is 30 nm, and their primary composition is Mn-doped NiFe 2 O 4 . The resulting highly porous structure of these nanosheets provides numerous active sites and effective electron and ion diffusion channels, thereby increasing charge density and mechanical stability. Electrochemical assays show that the areal-specific capacity of the synthesized electrode material reaches 4.34 C cm −2 (areal-specific capacitance is 8.68 F cm −2 ) at 1 mA cm −2 . Notably, the constructed hybrid supercapacitor achieves a power density of 544 µW cm −2 at an energy density of 390 µWh cm −2 . Furthermore, capacitance retention is 95.2% after 5000 charging cycles. Additionally, the assembled device delivers robust and sustained energy output for LED displays and electric toy cars. This method streamlines the production flow of electrode materials, reducing energy consumption while significantly enhancing the areal capacitance of supercapacitors. The assembled hybrid supercapacitor structure diagram and the assembled devices provide power sources for electric toy cars and LED displays.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Benlong Wei,Zhuannian Liu
Hybrid capacitive deionization (HCDI) is an innovative CDI technology that outperforms conventional CDI concerning desalination capability and charge efficiency. However, underutilized cathodes or anodes and mismatched kinetic behavior remain unsatisfactory given the imbalanced device architecture consisting of the capacitor and Faraday electrodes. Herein, we proposed a pseudo-capacitive behaviors induced dual-ion selective deionization (Di-CDI) strategy where molybdenum disulfide/polypyrrole (MoS 2 /PPy) acted as Na + intercalation cathode, and Ag-coated polyaniline-modified activated carbon (Ag@PANI/AC) served as Cl − trapping anode. In this system, the hollow PPy nanotube as the core is anchored by ultrathin MoS 2 nanoflakes, connecting loose MoS 2 nanoflowers to form a 3D flower-chain network, which holds convenient electron transfer routes and fast charge transport channels, facilitating accelerated ion diffusion process. Besides, Ag@PANI/AC was synthesized by modifying Ag particles on a 3D electron conduction substrate constructed by coupling PANI and AC, where Ag is responsible for the conversion reaction with Cl − to create AgCl. The conduction matrix compensates for the low conductivity of AgCl, enabling fast adsorption kinetics. As expected, the assembled Di-CDI system MoS 2 /PPy//Ag@PANI/AC delivers an excellent adsorption capacity of 25.1 mg g -1 , outstanding desalination rate (5.88 mg g -1 min -1 ), superior cycle stability (91.5% retention rate), and promoted charge efficiency of 56.2%, validating that this strategy supplies a viable way to achieve more energy-efficient CDI.
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International Journal of Electrochemical Science
·
2024
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IF 1.3
Lin Zhu,He-ying Xia,Chun-yong Zhang,Ying Geng,Zhe Li,Li Shu,Ji-rong Bai,Ying-pin Wen
As a new type of efficient electrochemical energy storage system, the supercapacitor serves as an effective means to support the development of clean energy, with the electrode material being the key determinant of performance. The electrode material Pt-NiCo 2 O 4 /C was prepared in this paper by stepwise hydrothermal and calcination methods using ZIF-67 as a template, aiming to improve specific capacitance performance and stability. Pt-NiCo 2 O 4 /C achieved a specific capacitance of 1665.3 F/g at a current density of 1.0 A/g, and maintained 94.49% of the original specific capacity after 3500 cycles at a current density of 4.0 A/g. The excellent specific capacitance performance of the Pt-NiCo 2 O 4 /C electrode material makes it a promising potential candidate for energy storage applications.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Haowei Zhang,Marcos Millan,Ziyin Chen,Tiantian Li,Zhengwei Cui,Guanming Yuan
Glycerol, a major byproduct of biodiesel production, is commonly used as an inexpensive feedstock for hydrogen (H 2 ) production through catalytic reforming. Developing efficient Ni-based catalysts with appropriate supports remains a challenge. In this study, three Ni-based catalysts, each containing 10 wt% Ni with different supports: carbon nanofibers (Ni@CNF), activated carbon (Ni/AC), and alumina (Ni/γ-Al 2 O 3 ), were comparatively evaluated for their effectiveness in the catalytic steam reforming of glycerol. The results show that both the catalyst support and the reforming temperature influence the co-production of H 2 and carbon nanotubes. All three catalysts exhibit good catalytic performance of H 2 production at 700 °C for 1 h. The corresponding H 2 yields, based on a steam-glycerol molar ratio of 11.9 and a flow rate of 0.2 mL/min, are 86.5%, 81.3%, and 69.2% for Ni@CNF, Ni/AC, and Ni/Al 2 O 3 , respectively. Ni@CNF demonstrates high H 2 production and good catalytic stability, whereas Ni/Al 2 O 3 generates high-yield carbon nanotubes.
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JOURNAL OF MOLECULAR STRUCTURE
·
2024
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IF 4
Kecan Dou,Deqiong Xie,Jing Shi,Jie Chen,De-Li Chen,Weidong Zhu,Fumin Zhang
The catalytic conversion of furfural to furfuryl alcohol is crucial for maximizing biomass resource efficiency. This research aims to develop Co-NC/MXene catalysts for the hydrogenation reaction by pyrolyzing a mixture of Zn/Co bimetal zeolitic imidazolate framework (ZnCo-ZIF) and MXene. During the pyrolysis process, the organic components of the ZnCo-ZIF network are converted into nitrogen-doped porous carbon (NC). Simultaneously, Co metal nodes are transformed into Co nanoparticles, which are embedded within the NC framework and firmly anchored onto the MXene surface. The resultant 14.6 % Co-NC/MXene catalyst demonstrated exceptional performance in selectively hydrogenating furfural to furfuryl alcohol, with a 98.7 % conversion and 100 % selectivity under mild conditions (333 K and 2 MPa H 2 for 12 h), utilizing water as the solvent. Structural characterizations and comparative analyses with alternative catalysts, including Co nanoparticles on activated carbon (Co-NC/C), MXene-support-free Co-NC, and Co im /MXene synthesized through impregnation, reveal that the superior efficiency of the 14.6 % Co-NC/MXene catalyst originates from the collaborative efforts between Co nanoparticles and the MXene support. Furthermore, the catalyst exhibited remarkable stability, preserving its catalytic activity and selectivity with minimal degradation across six consecutive cycles.
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Catalysts
·
2025
·Vol. 15
·期 2
·169
·
IF 4
Shihu Ding,Peng Tan,Nuo Meng,Xiguo Zhang,Lin Ma,Minghua Zhou,Wei Wang
In this study, the novel composite materials of activated carbon (AC) and persulfate (PS) doped by nitrogen (N) and sulfur (S) were successfully synthesized through one-step mechanical ball milling. Different from the previous liquid-phase activation process of PS, the direct in situ solid-phase activation of PS was achieved through the newly generated chemical bonds between AC and PS. The increased crystal surface exposure and highly electronegative atoms provided more reactive sites for the modified composites, enabling them to extract electrons from the pollutant. Compared to S doping, the N-doped composite exhibited a higher oxidative degradation ability, with a removal rate of 93.6% for tetracycline (TC, 40 mg/L) within 40 min. The interactions between AC and PS that occur in the interior of the composite avoid the limitations of mass transfer between the solid–liquid interface, thus expanding the pH application range of the catalytic reaction and minimizing the interference of other components in the solution. The synergistic effect between active oxygen species and electron transfer is the main mechanism for promoting pollutant degradation. This research puts forward a new insight into the activation approach of PS and proposes a feasible method for the advanced treatment of TC wastewater.
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ACS Sustainable Chemistry & Engineering
·
2024
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IF 7.1
Jiang-Nan Zhao,Chenchen Liu,Kang Yang,Rui Tang,Qiyan Fu,Kai Ke,Bo Yin,Ming-Bo Yang,Wei Yang
Integrating multiple functions into fabrics has provided attractive opportunities for smart wearable technologies. However, it remains challenging to achieve functionalities with fabrics through a facile green pathway suitable for industrialization. Herein, we demonstrate a facile metal-free and solvent-free route to endow commercial fabrics with unified functions utilizing hydroxyethyl cellulose (HEC) and carbon black (CB) via facile dip-coating. Based on the superior compatibility of HEC and CB, incorporating trace amounts of CB (as low as 0.25 wt %) triggers remarkable photo/electro-responsive thermal conversion with rapid responsiveness, appropriate temperatures, and reliable repeatability, verifying wearable heating performances of the modified fabrics. Notably, the resultant fabrics serving as a tribopositive material of triboelectric nanogenerators harnessed electrical signals from minute movements to deliver an open voltage of 321 V, a short current of 3.84 μA, and a transferred charge of 9 nC, and eventually achieved a maximum instantaneous power density up to 2067 mW/m2, showing a significant improvement of 28.2 times higher than that of the original fabric. Furthermore, the fabric-based TENGs effectively deliver instantaneous feedback on human motion and gait analysis, which exhibits good application prospects for detecting and optimizing body postures. The eco-friendly and effective methodology drives the facile and sustainable conversion of commercial fabrics toward wearable healthcare applications.
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危险品化学品经营许可证（带存储）