JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
·
2024
·Vol. 99
·期 4
·922-930
·
IF 2.8
Dingshuo Zhang,Heqian Zhang,Yue Li,Daolai Sun,Jianhua Lv
BACKGROUND Levulinic acid is an important platform chemical derivable from lignocellulosic biomass. In this work, the hydrogenolysis of levulinic acid to produce 1,4-pentanediol was performed over some Co-based non-noble catalysts. The relationship between the catalyst properties and the catalytic activity was investigated, and the effects of the reaction conditions on the catalytic activity were studied. RESULTS The Co/ZrO 2 catalyst prepared by a coprecipitation method showed a high catalytic performance in the hydrogenolysis of levulinic acid to form 1,4-pentanediol. The calcination of Co/ZrO 2 significantly affected the catalytic activity, and a high calcination temperature of 750 °C could promote the formation of 1,4-pentanediol. Meanwhile, the reduction of Co/ZrO 2 at 400 °C in an H 2 flow was beneficial for producing 1,4-pentanediol, and the Co species after the reduction existed as the forms of Co 2+ and Co 0 . A high H 2 pressure and a moderate reaction temperature of 200 °C were beneficial for producing 1,4-pentanediol, and a high 1,4-pentanediol selectivity of 85.6% with a complete conversion of levulinic acid was obtained over the Co/ZrO 2 catalyst at 200 °C under an H 2 pressure of 7 MPa. CONCLUSION The Co species in the 400 °C-reduced Co/ZrO 2 catalyst existed as the forms of Co 2+ and Co 0 . It was proposed that the synergistic effect of Co 2+ and Co 0 contributed to the effective formation of 1,4-pentanediol from levulinic acid. © 2024 Society of Chemical Industry (SCI).
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CHEMOSPHERE
·
2024
·
IF 8.1
Mu Li
The release of organic dyes, such as Rhodamine B (RhB), into industrial wastewater has led to significant issues with color pollution in aquatic environments. Herein, we prepared a cobalt nanoparticles (NPs)-based catalyst with the nitrogen-doped carbon-support (Co@N–C) for effective PMS activation. The Co@N–C/PMS system demonstrated the excellent catalytic activity of Co@N–C for activating PMS, achieving nearly 100% degradation of RhB. Singlet oxygen ( 1 O 2 ) and sulfate radicals (SO 4 • - ) were dominant reactive oxygen species for RhB degradation. Density functional theory (DFT) calculations substantiated that the production of 1 O 2 commenced with the initial generation of *OH through hydrogen abstraction from PMS, culminating in the direct release of oxygen to form 1 O 2 (PMS→*OH→O*→ 1 O 2 ). The generation of SO 4 • - was attributed to electron transfer to PMS from the surface of Co NPs (Co 0 →Co 2+ →Co 3+ ) and the C–N shell (Co 2+ →Co 3+ ). The research findings provided new insights into the development of Co-based heterogeneous catalysis for advanced oxidation of refractory organic pollutants in wastewater treatment.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 34
·1-13
·
IF 2.8
Xu Jialing,Jing Haofeng,Hou Xiong,Feng Hengheng,Yu Hongtao
For capacitor applications, Ba(Sm 1- x - y La x Bi y ) 2 Ti 4 O 12 dielectric ceramics with La/Bi co-substitution for Sm were prepared using the conventional solid-state method. Part of Sm 3+ was found to be replaced by La 3+ and Bi 3+ in ceramics that exhibit an orthorhombic tungsten bronze structure. As the concentration of Bi 3+ increased, a second phase of Bi 4 Ti 3 O 12 was observed. The co-substitutions could reduce the sintering temperature and effectively increase the dielectric constant from 80 to 140. The dielectric loss increased slightly with increasing La 3+ and Bi 3+ , but it still remained below 0.1% at 1 kHz. After sintering, a specific composition was achieved with x = 0.1 and y = 0.4. It has a high dielectric constant of 132, an ultra-low dielectric loss of approximately 0.06%, and excellent frequency stability. Additionally, it exhibits a capacitance-temperature change of ± 1% at 1 kHz over a temperature range of − 55 to 125 °C.
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PHYSICA SCRIPTA
·
2025
·Vol. 100
·期 3
·035514
·
IF 2.6
Ruiliang Zuo,Zehua Zhang,Jingheng Liang,Zhenzhen Jiang,Lili Wang,Zian Cheak Tiu
In this study, we synthesized Y2Zr2O7 (YZO): Bi3+/Eu3+ microcrystals through high-temperature solid-phase method. When the microcrystals were excited upon 263 nm and 329 nm, a tunable emission color variation from red to white is observed. The Correlated Color Temperature (CCT) of YZO: 6% mol Bi3+, 5% mol Eu3+ excited upon 329 nm is 4194 K, exhibited warm white light. Furthermore, the emission intensity of Eu3+ ion is remarkably improved by the incorporation of Bi3+ ion, due to the energy transfer from Bi3+ ion to Eu3+ ion. Their efficiency (ηT) in YZO: 6% mol Bi3+, 5% mol Eu3+ reaches 49.17%. The corresponding absolute quantum efficiency (λex = 329 nm) of YZO: 6% mol Bi3+, 5% mol Eu3+ is 56.21%. These results indicate that YZO: Bi3+/Eu3+ microcrystals are highly potential to enhance the industrial growth of photonics field, particularly the application of anti-counterfeiting and white light-emitting diodes.
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JOURNAL OF APPLIED TOXICOLOGY
·
2024
·
IF 2.7
Canyang Wang,Zhengzheng Zhou,Yayu He,Juan Li,Yi Cao
Food contaminates, such as insecticide, may influence the toxicity of nanoparticles (NPs) to intestine. The present study investigated the combined toxicity of TiO 2 NPs and fipronil to male mouse intestine. Juvenile mice (8 weeks) were orally exposed to 5.74 mg/kg TiO 2 NPs, 2.5 mg/kg fipronil, or both, once a day, for 5 days. We found that both TiO 2 NPs and fipronil induced some pathological changes in intestines, accompanying with defective autophagy, but these effects were not obviously enhanced after TiO 2 NP and fipronil co-exposure. Fipronil promoted Ti accumulation but induced minimal impact on other trace elements in TiO 2 NP-exposed intestines. Metabolomics data revealed that the exposure altered metabolite profiles in mouse intestines, and two KEGG pathways, namely, ascorbate and aldarate metabolism (mmu00053) and glutathione metabolism (mmu00480), were only statistically significantly changed after TiO 2 NP and fipronil co-exposure. Five metabolites, including 2-deoxy-D-erythro-pentofuranose 5-phosphate, 5alpha-cholestanol, beta-D-glucopyranuronic acid, elaidic acid, and isopentadecanoic acid, and maltotriose, were more significantly up-regulated after the co-exposure, whereas trisaccharide and xylonolactone were only significantly down-regulated by the co-exposure. We concluded that fipronil had minimal impact to enhance the toxicity of TiO 2 NPs to mouse intestines but altered metabolite profiles.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Ruixing Wang,Siyuan Bian,Bao Zhang,Lengfeng Yan,Linjun Feng,Jing Bai
Microbial-induced carbonate precipitation (MICP) has garnered increasing attention in the realm of building materials. Among them, urease microorganisms have been extensively investigated due to their favorable attributes, including facile reaction control, heightened mineralization efficiency, and straightforward microorganism cultivation. Nevertheless, the presence of ammonia byproducts throughout the reaction process significantly restricted its extensive utilization. This work employed the application of microbial-induced carbonate precipitation (MICP) technology to modify the surface of cement-based materials in a solution environment. Simultaneously, the generation of struvite (MgNH 4 PO 4 •6H 2 O) was induced to eliminate ammonia byproducts and improve the cementitious ability of the film layer. The potential synergistic impact between calcium carbonate (CaCO 3 ) and struvite was observed, resulting in the production of a composite film with enhanced performance. Furthermore, the elimination efficacy of ammonia byproducts was found to exceed 90% after a treatment duration of 96 h.
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TALANTA
·
2024
·
IF 5.6
Xueli Yuan,Jing Kong,Ying Xie,Xinxin Liu,Wei Zhang,Tao Liu,Zhenyu Chu,Wanqin Jin
The abuse of kanamycin (KAN) poses an increasing threat to human health by contaminating agricultural and animal husbandry products, drinking water, and more. Therefore, the sensitive detection of trace KAN residues in real samples is crucial for monitoring agricultural pollution, ensuring food safety, and diagnosing diseases. However, traditional assay techniques for KAN rely on bulky instruments and complicated operations with unsatisfactory detection limits. Herein, we developed a novel label-free aptasensor to achieve ultrasensitive detection of KAN by constructing mesoporous DNA-cobalt@carbon nanofibers (DNA-Co@C-NFs) as the recognizer. Leveraging the extended π-conjugation structure, prominent surface area, and abundant pores, the Co@C-NFs can effectively load aptamer strands via π-π stacking interactions, serving as KAN capturer and reporter. Due to the change in DNA configuration upon binding KAN, this aptasensor presented an ultralow detection limit and ultra-wide linear range, along with favorable precision and selectivity. Using real tap water, milk, and human serum samples, the aptasensor accurately reported trace KAN levels. As a result, this convenient and rapid autosensing technique holds promise for onsite testing of other antibiotic residues in agriculture, food safety, and clinical diagnosis.
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RARE METALS
·
2024
·
IF 9.6
Zeng Jin-Quan,Qi Jun-Lei,Yang Yue-Yang,Zhang Min-Hao,Lin Yuan-Hua
The practical application of CaSmAlO 4 microwave dielectric ceramics is limited by its low quality factor ( Q × f ) value and non-zero temperature coefficient resonant frequency ( τ f ) value. In this study, we introduced Mg 2+ –Ti 4+ ionic pairs into CaSmAlO 4 , along with an excess of 9% Sm 2 O 3 . The Mg 2+ –Ti 4+ ionic pairs substituted Al 3+ , and two phases simultaneously coexisted in the ceramics: CaSmAlO 4 and Sm 2 O 3 . As the doping concentration of Mg 2+ –Ti 4+ ionic pairs increased, the relative permittivity exhibited an upward trend, while the quality factor and resonant frequency temperature coefficient first rose and then descended. Remarkably, 0.09Sm 2 O 3 –0.91CaSmAl 0.7 Mg 0.15 –Ti 0.15 O 4 sintered at 1450 °C yielded excellent dielectric properties: ε r = 19.72, Q × f = 72,936 GHz, and τ f = –0.044 ppm·°C − 1 . The factors influencing the microwave dielectric properties of 0.09Sm 2 O 3 –0.91CaSmAlO 4 ceramics were further examined by considering the crystal structure, grain size, Lichtenecker logarithmic rule, tolerance factor and packing fraction. Graphic abstract
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yang Liu,Asif Ali Siyal,Chunbao Zhou,Chenglong Liu,Jie Fu,Yingwen Zhang,Bang Yao,Li Chao,Huimin Yun,Jianjun Dai,Xiaotao Bi
Microwave co-pyrolysis of textile dyeing sludge (TS) and furfural residue (FR) was investigated in this study. Comprehensive pyrolysis index (CPI) was employed to investigate pyrolysis performance and FR addition significantly improved co-pyrolysis. Product distribution showed that increasing FR ratio enhanced the bio-oil and gas with significant reduction in biochar. For bio-oil, FR addition neutralized the strong alkalinity and inhibited the formation of nitrogen compounds. Moreover, bio-oil maintained a very low oxygenates content (0.97–5.97%). For biochar, co-pyrolysis was favorable for the enrichment of C and H and mitigated the potential contamination. FR addition increased the calorific value and contributed to pore development of biochar. Online inspection displayed that co-pyrolysis drastically restrained the release of sulfur-compounds and nitrogenates in volatile, while enhanced the production of alkanes, aldehydes, and ketones. Moreover, the interaction between TS and FR was influenced by their major components. For heavy metals (HMs), Er was at low risk for most HMs and FR addition ratios of 40 and 80 wt% appeared to be more favorable. Principal component analysis (PCA) showed that FR addition changed the decomposition behavior and affected co-pyrolysis process. This study also evaluated the co-pyrolysis synergistic mechanisms of TS and FR. Overall, microwave co-pyrolysis is a novel and effective method to reduce environmental pollution and produce high-quality products, providing new insights for the low consumption and efficient utilization of industrial solid waste.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 46
·19508-19518
·
IF 2.7
Yuanyuan Wang,Yingjing Xia,Xingshen Dong,Wenyi Wang,Xueqin Wang,Yanxiu Liu,Peng Qiao,Geng Zhang,Shetian Liu
Supercapacitors, an innovative energy storage technology, combine the strengths of batteries and capacitors, enabling diverse applications in sectors such as communications, transportation, and aerospace. Porous carbon materials derived from biomass have excellent electrical conductivity, customizable dimensions, high surface area, and robust electrochemical stability, rendering them ideal candidates for supercapacitor electrodes. This research utilized edamame shells as the carbon precursor and KOH as the activating agent to synthesize a series of N/O co-doped porous carbons (ESC-x-800) through a combined pre-carbonization and activation process. This study thoroughly investigated the effect of KOH addition on the morphology, structure, and electrochemical performance of the materials. The result showed that the ESC-3-800 stood out as the top performer, distinguished by its unique self-doping characteristic with N and O atoms and a unique hierarchical porous structure. The ESC-3-800 boasted an impressive specific surface area of 3188.98 m2 g−1, coupled with a substantial pore volume of 1.86 cm3 g−1. When evaluated in a three-electrode system, ESC-3-800 demonstrated a remarkable specific capacitance of 301 F g−1, and a capacitance retention rate of 73.1% at a high current density of 20 A g−1. In a two-electrode setup, the ESC-3-800 achieved a notable high energy density of 37.6 W h kg−1 (at a power density of 200 W kg−1) in the 1 M Na2SO4 electrolyte. Remarkably, after enduring 12 000 charge–discharge cycles in 6 M KOH, it maintained an impressive 96.68% of its initial capacity (8 A g−1), demonstrating exceptional long-term stability and durability. The straightforward preparation method and outstanding performance of the edamame shell-derived N/O co-doped porous carbon underscore its immense potential for practical applications in supercapacitors.
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FOOD CHEMISTRY
·
2024
·
IF 8.5
Xiaoyu Guo,Shuyue Wang,Jiang Liang,Meihong Xu
Deoxynivalenol and Alternaria toxins are common food contaminants posing significant threats to human and animal health. Although their individual toxicities have been extensively studied, the combined effects of co-exposure remain largely unexplored. Our findings revealed combined toxins displayed concentration-dependent synergistic and antagonistic interactions on human hepatocellular carcinoma cells. Co-exposure significantly reduced mitochondrial activity, increased intracellular ROS levels, and activated the mitochondrial-dependent caspase signaling pathway, ultimately leading to enhanced apoptosis. Metabolomics analysis revealed that combined exposure severely disrupted multiple key metabolic processes, including those related to energy (NAD + , adenosine, AMP, and ADP), amino acids ( l -aspartate, l-glutamate), and carbohydrate (Glucose-6-phosphate) metabolisms. These findings highlight that co-occurrence exacerbates the disruption of overall metabolic balance, potentially impairing the normal function of cells by affecting energy production, protein synthesis, and cell proliferation. This study underscores the importance of considering combined mycotoxin exposure and provided possible ideas for inhibiting or mitigating toxicity to ensure food safety.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Yiming Guo,Yaowei Zhu,Jun Sun,Yongxing Lin,Xiangyang Li,Gang Liu,Yi Gong,Xian Zhang,Xingyou Tian,Xiaoxiao Li,Lin Chen
Obtaining uniformly dispersed particles within a carbon skeleton using metal-organic frameworks (MOFs) as a precursor is crucial for constructing multiple heterogeneous interfaces that enhance electromagnetic wave (EMW) absorption. Herein, MOF-derived carbon nanotubes (CNTs) bridged cobalt/molybdenum carbide@N-doped carbon (Co/MoC@NC) composites with honeycomb-like porosity were synthesized using an ion-exchange strategy followed by pyrolysis. Theoretical calculations and experimental observations confirm the existence of a heterogeneous interface between MoC and Co. Enhanced Co doping accelerates charge transfer from Co to MoC, thereby increasing interfacial polarization. Furthermore, the CNTs catalytically generated by Co facilitate the formation of conductive pathways between the honeycomb-like porous structure of Co/MoC@NC. This enhances conductivity and optimizes impedance matching. Flexible control of the dielectric properties is achieved by adjusting the level of Co doping, which results in tunable microwave absorption (MA) properties. As a result, the minimum reflection loss ( RL min ) of Co/MoC@NC reaches −68.68 dB at a thickness of 1.83 mm, while the effective absorption bandwidth (EAB) is 4.45 GHz at a thickness of 1.85 mm. This study presents a novel approach to utilizing honeycomb-like porous MOF-derived heterojunctions for the precise regulation of MA.
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