Energies
·
2024
·Vol. 17
·期 23
·5811
·
IF 3
Qing Zou,Zhenhui Chen,Siwen Ding,Jimin Xu,Maogang He,Xiangyang Liu
As a renewable energy source and potential substitute for fossil fuels, biodiesel plays an increasingly important role in both energy security and environmental protection. Accurate thermal conductivity data of biodiesels and their mixture with diesel are critical to engine design to achieve high combustion efficiency. This study measured the thermal conductivity of binary mixtures of heptane and biodiesel components, specifically methyl myristate, methyl laurate, and methyl caprate, over a temperature range of 298.15–328.15 K, using the two-wire 3ω method. Based on the experimental data, the effect of mass fraction, temperature, and carbon chain length of the fatty acid ester on the thermal conductivity was analyzed. The second-order Scheffé polynomial model, Flippov equation, Jamieson equation, and Chen equation were used to correlate the experimental data and compare to find a better one. The Flippov equation shows the lowest absolute average relative deviation of 0.80% for the binary mixtures of heptane with methyl myristate, methyl laurate, and methyl caprate.
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Polymers
·
2024
·
IF 4.7
Shaomin Liu,Zihan Wang,Mingyi He,Jinglin Zhu
The pollution of water bodies by heavy metal ions has recently become a global concern. In this experiment, a novel chelating resin, D851-6-AHHA, was synthesized by grafting 6-amino-N-hydroxyhexanamide (6-AHHA) onto the (-CH 2 N-(CH 2 COOH) 2 ) group of the D851 resin, which contained a hydroxamic acid group, amide group, and some carboxyl groups. This resin was developed for the purpose of removing heavy metal ions, such as Cr(III) and Pb(II), from water. The findings from static adsorption experiments demonstrated the remarkable adsorption effectiveness of D851-6-AHHA resin towards Cr(III) and Pb(II). Specifically, the maximum adsorption capacities for Cr(III) and Pb(II) were determined to be 91.50 mg/g and 611.92 mg/g, respectively. Furthermore, the adsorption kinetics of heavy metal ions by D851-6-AHHA resin followed the quasi-second-order kinetic model, while the adsorption isotherms followed the Langmuir model. These findings suggest that the adsorption process was characterized by monolayer chemisorption. The adsorption mechanism of D851-6-AHHA resin was comprehensively investigated through SEM, XRD, FT-IR, and XPS analyses, revealing a high efficiency of D851-6-AHHA resin in adsorbing Cr(III) and Pb(II). Specifically, the (-C(=O)NHOH) group exhibited a notable affinity for Cr(III) and Pb(II), forming stable multi-elemental ring structures with them. Additionally, dynamic adsorption experiments conducted using fixed-bed setups further validated the effectiveness of D851-6-AHHA resin in removing heavy metal ions from aqueous solutions. In conclusion, the experimental findings underscored the efficacy of D851-6-AHHA resin as a highly efficient adsorbent for remediating water bodies contaminated by heavy metal ions.
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JOURNAL OF FOOD SCIENCE
·
2024
·Vol. 89
·期 10
·6707-6719
·
IF 3.2
Qilei Wang,Zhenzhen Feng,Chan Shi,Xingang Lyu,DaiDi Fan
Sulforaphane-loaded nanoparticles (NP-SF) were prepared in this study to improve their biological effects. Based on propylene glycol alginate and zein as wall materials and anthocyanin and CaCl 2 as crosslinking agents, the NPs were encapsulated by the crosslinking method and freeze-dried. With the increasing contents of anthocyanin and Ca 2+ , the encapsulation efficiency and loading capacity of NP-SF were both increased. In vitro simulated digestion experiments showed controlled release of SF from the NPs. The pharmacokinetics confirmed that NP-SF exerted a slower release effect in rats, with improved SF bioavailability and protective effects on liver injury induced by N -diethylnitrosamine in mice. NP-SF reduced serum indicators of liver injury, increased the activities of antioxidant enzymes and GSH levels, and reduced malondialdehyde levels in the liver. In addition, SF activated the Keap1/Nrf2 signaling pathway and upregulated the expression of the Nrf2 downstream genes NQO1 and heme oxidase 1. High doses of NP-SF, in particular, had a higher therapeutic effect. In conclusion, encapsulation enhanced the biological activity of SF and promoted physiological function.
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2024
·
IF 2.3
Zhu Mengxuan,Xu Wenqi,Wang Longyang,Wang Rui,Jiang Heng,Jin Changzi
Developing sustainable synthesis method of versatile zeolites to overcome the shortcoming of traditional process is of significant for development of green chemistry and environmentally friendly techniques. In this work, MFI zeolite (ZSM-5) was synthesized through organotemplate-, solvent- and seed-free sustainable process comprising physical grinding and quasi-solid state crystallization and utilizing commercial silica gel or Stöber colloidal SiO 2 as silica source. The key influencing factors to this sustainable synthesis process, such as starting material composition, crystallization temperature and time, had been unambiguously investigated by combining a series of characterization techniques. It is revealed that the starting material with SiO 2 /Al 2 O 3 and Na 2 O/SiO 2 at 30–40 and 0.072, respectively, is suitable to obtain zeolite product with high crystallinity. The presence of right amount of water (or alcohol) is also crucial. In addition, this green synthesis method can be extended into the fabrication of encapsulated metal-zeolite bifunctional catalyst, which is effective in hydroisomerization of n -heptane. These results are instructive for development of sustainable synthesis of aluminosilicate zeolites and derived heterogeneous catalysts. Graphical Abstract
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CARBOHYDRATE RESEARCH
·
2024
·
IF 2.4
Lin Wang,Yu Pang,Zhongwen Su,Meihua Xin,Mingchun Li,Yangfan Mao
N -(sodium 2-hydroxypropylsulfonate) chitosan (HSCS), N -sulfonate chitosan (SCS) and N -isonicotinic sulfonate chitosan (ISCS) were prepared. The structures of the prepared chitosan derivatives were characterized by nuclear magnetic resonance ( 1 H NMR) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, ultraviolet–visible (UV–vis) spectroscopy and elemental analysis (EA). Antibacterial and antibiofilm activities of these chitosan derivatives were evaluated in vitro . The minimum inhibitory concentration (MIC) of HSCS and SCS against Escherichia coli ( E. coli ) and Staphylococcus aureus ( S. aureus ) were 0.625 mg/mL and 0.156 mg/mL, respectively. ISCS exhibited MIC values of 0.313 mg/mL and 0.078 mg/mL against E. coli and S. aureus , respectively. ISCS demonstrated superior antibacterial and antibiofilm properties compared to SCS and HSCS. These findings suggest that the incorporation of a pyridine structure into sulfonate chitosan enhances its antibacterial and antibiofilm activities, and the prepared ISCS has a promising application prospect for controlling the reproduction of microorganisms in the field of food packaging.
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Materials Research Express
·
2024
·Vol. 11
·期 3
·036505
·
IF 1.8
Zhen Jiang,Liduo Chen,Yanhong Cui,Yanhua Suo,Wei Zhang,Yisi Zhou,Yingjun Wang
The monometallic Pt/SAPO-11 and bimetallic Ni-Pt/SAPO-11 catalysts were synthesized with Instant Exactness Synthesis (IES) method and characterized by XRD, nitrogen adsorption–desorption, SEM, TEM, FT-IR, Py-IR, NH3-TPD and XPS, and their properties were evaluated for the n-heptane hydroisomerization. The catalysts had spherical structure and moderate acid strength, and exhibited good n-heptane conversion and catalytic selectivity toward n-heptane isomers. Typically, Ni-Pt/SAPO-11 exhibited an isomer selectivity of 80.9% with a conversion of 69.9% at 310 °C, which was obviously better than Pt/SAPO-11 (isomer selectivity of 75.1% with a conversion of 60.6% at 310 °C). Moreover, the Ni-Pt/SAPO-11 catalyst displayed higher percentage of i-heptane (79%) and lower percentage of n-heptane (6%) than Pt/SAPO-11. The continuous test of 360 min indicated Ni-Pt/SAPO-11 catalyst had good catalytic stability. Bimetallic Ni-Pt alloy loaded on SAPO-11 had significantly effect on catalytic properties of n-heptane hydroisomerization.
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Liming Guo,Xin Wan,Jieyuan Liu,Xu Guo,Xiaofang Liu,Jiaxiang Shang,Ronghai Yu,Jianglan Shui
Synergistic effects have been applied to a variety of hybrid electrocatalysts to improve their activity and selectivity. Understanding the synergistic mechanism is crucial for the rational design of these types of catalysts. Here, we synthesize a MnCo2O4/Co–N–C hybrid electrocatalyst for the oxygen reduction reaction (ORR) and systematically investigate the synergy between MnCo2O4 nanoparticles and Co–N–C support. Theoretical simulations reveal that the synergy is closely related to the distance between active sites. For a pair of remote active sites, the ORR proceeds through the known 2e- + 2e- relay catalysis while the direct 4e– ORR occurs on a pair of adjacent active sites. Therefore, the formation of the undesired byproduct (H2O2) is inhibited at the interface region between MnCo2O4 and Co–N–C. This synergistic effect is further verified on an anion-exchange membrane fuel cell. The findings deepen the understanding of synergistic catalysis and will provide guidance for the rational design of hybrid electrocatalysts.
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Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Siyue He,Ningxuan Xue,Guanjie Lin,Yiyang Chen,Xinyu Gai,Yalin Yu,Fengling Liu,Zhaobing Guo,Pengxiang Qiu
Nowadays, organic contaminants have posed a considerable threat to the natural environment. Ferrate (Fe (VI)) is an environmentally friendly oxidant for decomposing organic contaminants in water. In this study, Co modified N-doped carbon nanosheets were prepared to enhance phenol degradation by Fe (VI) under alkaline conditions. Also, the properties, mechanism and transformation pathways were investigated. Co/NC-1000 significantly accelerated Fe(VI) activation, resulting in phenol degradation to be 1.5–4 times faster than with Fe(VI) alone, achieving 92 % removal within 75 seconds. Also, •OH is the essential active oxidizing species for the degradation of phenol in the Fe (VI)-Co/NC-1000 group, followed by 1 O 2 and Fe(V)/Fe(IV). Moreover, the catalyst remained stable over five cycles, making the Fe(VI)-Co/NC system a promising method for efficient water treatment.
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COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Fan Gao,Ying Nie,Yue Zhang,Tao Wang
Carbon nanomaterial is a momentous field of current biomedical research. However, extensive exploration is still required to endow carbon nanomaterial with both antibacterial properties and biological safety. In this study, fullerenol and calcium ions were synthesized into C 60 (OH) n -Ca nanoparticles through an electrostatic self-assembly strategy. Morphological and chemical analyses revealed that the C 60 (OH) n -Ca nanoparticles contained 4.52 at.% Ca, with a minimum size of approximately 10 nm. The electrostatic self-assembly did not alter the chemical structure of the fullerenol. The photodynamic antibacterial effect of the C 60 (OH) n -Ca nanoparticles was concentration-dependent, showing antibacterial rates of 94 % and 96.6 % against Escherichia coli and Staphylococcus aureus at a concentration of 100 μg/mL, while the antibacterial effect was unsatisfactory under dark conditions. Additionally, C 60 (OH) n -Ca nanoparticles promoted the proliferation of MC3T3-E1 cells, demonstrating desirable biological safety. The C 60 (OH) n -Ca nanoparticles synthesized in this article achieved a balance between antibacterial and cytocompatibility, thus possess potential applications in biomedical fields.
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FUEL
·
2024
·
IF 6.7
Wenhua Zhou,Xiaoxuan Li,Chao Chen,Teng Guo,Jianghao Wang,Kaige Wang,Bolong Li,Zhenyu Zhang,Jie Fu
Liquid organic hydrogen carriers (LOHCs) have garnered considerable attention and have undergone extensive studies owing to their high hydrogen storage density and ease of storage and transportation. Research has shown that carbon-supported bimetallic alloys exhibit exceptional performance as catalysts for low-temperature dehydrogenation. Nevertheless, developing high-efficiency carbon support catalysts and revealing the interaction between active metals and support remains challenging but significant. In this work, a cost-effective metal-modified activated carbon (AC) was synthesized and loaded with PdCoO active sites for low-temperature dehydrogenation of dodecahydro-N-ethylcarbazole (12H-NECZ) to produce hydrogen. The results show that: (1) Introducing tin (Sn) into the AC support to form highly dispersed PdCoO/Sn 2 -C improves the pore distribution and size of the catalyst, promoting the dispersion of active metals on the surface; (2) The interface effect between PdCoOx and Sn-C supports effectively regulates the electron transfer inside the catalyst, enhances the synergistic effect between metals, and reduces electron transfer resistance, thereby improving dehydrogenation catalytic activity. The results show that at 140 °C, 12H-NECZ was completely dehydrogenated after 8 h, with a selectivity of 92.5%, while the palladium loading was only 2.2 wt%. This study provides a suitable method for the targeted design of catalysts by altering the electronic effects of supports.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Yu Xie,Xiangdong Ma,Fei Wang,Wanru Wang,Ruiqi Li,Tingrui Li,Xiaojie Liu,Jirong Mou,Jujun Yuan,Bin Li,Xiaokang Li,Jun Liu
Tin (Sn) has been recognized as a viable anode material for sodium-ion batteries due to its non-toxic nature, affordability, and high specific capacity. Nonetheless, Sn experiences substantial volume changes during charge–discharge processes, which results in accelerated capacity degradation. Herein, a novel solvothermal method is developed to synthesize a composite of tin nanoparticles covalently bonded to nitrogen-doped three-dimensional graphene (Sn/3DNG) through stable C-Sn bonds. The design of the Sn/3DNG composite effectively mitigates the volume changes of tin during sodium insertion/extraction process by using the robust framework of 3DNG to confine and support Sn nanoparticles. The presence of C-Sn bonds prevents the tin nanoparticles from clumping together, thereby enhancing the electrode’s durability. Owing to these improvements, the Sn/3DNG anode exhibits a cyclic retention of 87.7 % after 800 cycles and maintains a substantial specific capacity of 350 mAh g -1 at 5 A g -1 . This advancement underscores the potential of Sn-based nanocomposites in advancing the next generation of rechargeable batteries.
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Energy Materials
·
2025
·Vol. 5
·期 3
·N
·
IF 11.2
Hongwei Liu,Zhenming Cui,Yan Sun,Zhennan Qiao,Yanlan Zhang,Qiang Bai,Yongzhen Wang
Carbon-based supercapacitors have emerged as promising energy storage components for renewable energy applications due to the unique combination of various physicochemical characteristics in porous carbon materials (PCMs) that can improve specific capacitance (SC) properties. It is essential to develop a methodical approach that exploits the synergy of these effects in PCMs to achieve superior capacitance performance. In this study, machine learning (ML) provided a clear direction for experiments in the screening of key physicochemical features; SHapley Additive exPlanations analysis on ML indicated that specific surface area and specific doping species had a significant synergistic impact on SC enhancement. Utilizing these insights, an O, N co-doped hierarchical porous carbon (ONPC-900) was synthesized using a synergistic pyrolysis strategy through K2CO3-assisted in-situ thermal exfoliation and nanopore generation. This method leverages the role of carbon nitride (graphite-phase carbon nitride) as an in-situ layer-stacked template and the oxygen (O)-rich properties of the pre-treated lignite, enabling controlled synthesis of graphene-like folded and amorphous hybrid structures engineered for the efficient N and O doping sites and high specific surface area, resulting in an electrode material with enhanced structural adaptability, rapid charge transfer, and diffusion mass transfer capacity. Density functional theory (DFT) calculations further confirmed that pyrrole nitrogen (N-5), carboxyl (-COOH) active sites, and the defect structure formed by pores synergically enhanced the adsorption of electrolyte ions (K+) and electron transfer, improving the SC performance. The optimized ONPC-900 electrode exhibited impressive SC properties of 440 F g-1 (0.5 A g-1), outperforming most coal-based PCMs. This study provides a methodology for designing and synthesizing high SC electrode materials by optimizing the key characteristic parameters of synergism from complex structure-activity relationships through the combination of ML screening, experimental synthesis, and density functional theory validation.
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