RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3369-3389
·
IF 2.8
Wang Lu,Rehman Mooeez ur,Jiang Yong,Sun Fan,Zhao Yuanqi,Lu Xiyue,Zhang Zhijun,Liu Wei,Xu Yan,Zhai Yong,Zhao Yujun
With the growing global demand for biodegradable plastics, the hydrogenation of dimethyl maleate (DMM) to produce 1,4-butanediol (BDO), raw materials for poly(butylene succinate), has become one of the hot spots in chemical industry. In this work, we synthesized a series of Cu@C/ZnO–S x catalysts by the method of sorbitol modification for the liquid-phase hydrogenation of DMM. The modification with appropriate sorbitol led to a decoration of carbon on catalyst surface, which improved the copper dispersion and Cu + /(Cu 0 + Cu + ) molar ratio in the Cu@C/ZnO–S 0.08 catalyst. The carbon decoration not only promoted the formation of more copper species having stronger interaction with ZnO, but also enhanced the absorption of ester on catalyst surface. These distinctive properties contributed to the high performance of the Cu@C/ZnO–S 0.08 catalyst in DMM hydrogenation, achieving an excellent BDO yield of 98.4% and superior reusability. The insights into the roles of sorbitol modification could give valuable guidance to the further design of high performance catalysts for esters hydrogenation. Graphical abstract
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Catalysts
·
2024
·Vol. 14
·期 6
·344
·
IF 3.8
Fengshun Cheng,Yuchen Guo,Xinhong Liang,Fanqiushi Yue,Yichang Yan,Yang Li,Yuanzhi Zhu,Yanping He,Shangfeng Du
Ionic liquid modification for carbon-supported platinum (Pt/C) electrocatalysts to enhance their oxygen reduction reaction (ORR) activity has been well recognized. However, the research has only been reported on the low-Pt-loading Pt/C electrocatalysts, e.g., 20 wt%, while in practical applications, usually high-Pt-loading Pt/C electrocatalysts of 45–60 wt% are used. In this work, ionic liquid modification is systematically investigated for a Pt/C electrocatalyst with 60 wt% Pt loading for its ORR activity in the cathode in proton exchange membrane fuel cells (PEMFCs). Various adsorption amounts are studied on the catalyst surface. Different modification behavior is found. Mechanism exploration shows that the adsorption of ionic liquid mainly happens on the Pt electrocatalyst surface and in the micropores of the carbon support. The highest fuel cell power performance is achieved at an ionic liquid loading of 7 wt%, which is much higher than the 3 wt% reported for the low-Pt-loading Pt/C.
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Frontiers in Sustainable Food Systems
·
2024
·
IF 3.7
Weiwei Xu,Wei Zhou,Jinfeng Sun,Weiwei Chen,Xuanye Wu,Tong Guan,Yilin Zhao,Pengcheng Yang,Zhengyu Hu,Gao Li
The purpose of this study was to obtain polysaccharides from Panax ginseng C. A. Meyer stems (PGSPs), agro-byproducts with development potential, and fully explore the potential value in P. ginseng stems. Two novel polysaccharides firstly from P. ginseng stems (PGSP-1 and PGSP-2) were obtained by water extraction and alcohol precipitation method and column chromatography, and then characterized by FT-IR, HPGPC, HPLC, SEM, TGA, GC–MS and NMR. The results demonstrated that PGSP-1 (Mw = 723.83 kDa) and PGSP-2 (Mw = 620.48 kDa) were characterized →4)-β-D-Galp-(1→, →6)-α-D-Glcp-(1 → and →2)-α-L-Rhap-(1 → as the skeleton, →4,6)-β-D-Galp-(1 → and →2,6)-α-D-Manp-(1 → as the cross junction, α-L-Araf-(1 → as the terminal unit, and PGSP-1 still contained →4)-β-D-Galp, while PGSP-2 contained →4)-β-D-Xylp-(1→, →3)-β-D-GlcpA-(1→, →4)-β-D-GalpA-(1 →) and α-D-Glcp-(1→, with different microstructures and thermal stability. And the results of hypoglycemic activity revealed that both PGSP-1 and PGSP-2 showed excellent inhibitory activity against α-glucosidase and α-amylase, in which PGSP-2 had the better performance. The inhibition kinetics result showed that PGSPs on α-glucosidase and α-amylase were non-competitive type and mixed type inhibition. This study provided a theoretical basis for making full use of and exploiting the economic value of agro-byproducts such as P. ginseng stems and offered a theoretical reference for the effective utilization of PGSP as a functional component to prevent and reduce T2DM.
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APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Feiyang Zhang,Penglei Xu,Xueqing Jin,Chen Wang,Qi Shen,Chunyan Sun
Polybrominated diphenyl ethers (PBDEs) have attracted increasing attention due to their biotoxicity and persistence. Herein, rapid degradation of decabromodiphenyl ether (BDE209) was achieved on bromine vacancies enriched BiOBr (BOB-V Br ) nanosheets, with a degradation rate for BDE209 under visible light irradiation (λ > 400 nm) exceeding 95 % within 6 min. The initial two minutes serve as an induction period, during which the Br vacancies were in-situ introduced into the BiOBr (BOB) nanosheets. By precisely controlling the duration of photoinduction, varying concentrations of Br vacancies were successfully generated on the surface of the BOB nanosheets. Consequently, an enhanced degradation rate of BDE209 was observed in direct correlation with the increased concentration of Br vacancies. BOB-V Br showed a remarkable selectivity of 74 % for meta- product (BDE207). This selectivity towards BDE207 surpasses that of other anionic vacancies, as oxygen, sulfur, and iodine vacancies. The in-situ generated Br vacancies help to accommodate the Br atom of BDE209 in atomic size and electronic structure, thus facilitating the activation of the C-Br bond and achieving rapid BDE209 debromination. This work provides a new insight for the treatment of organic halogenated pollutants by photocatalysts with homologous halogen vacancies.
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CARBON
·
2024
·
IF 10.5
Yongqing Shen,Peizhi Liu,Yangrui Li,Jianghong Wu,Yanhui Song,Junjie Guo
The structural stability of supported metal nanoparticles determines the activity and longevity of heterogeneous catalysts. Unfortunately, the chemical/thermal working environment inevitably accelerates metal sintering to larger crystallites that leads to the degradation of catalytic performance. Here, we demonstrate that the distribution of defects in carbon support as an inherent parameter plays a crucial role in catalyst sintering. Based on in-situ transmission electron microscopy studies, the strong metal-support interaction between platinum (Pt) nanoparticles and defect-rich graphene nanoflakes largely suppresses metal sintering up to 700 °C. Particularly, the optimal carbon support can be achieved in the annealing process, in which the mass transfer and charge transport can be enhanced by accurately manipulating the distribution of defects in carbon matrix and graphitization degree. It is worth noting that the screened Pt/GNs-300 exhibits impressive oxygen reduction reaction performance with high half-wave potential (0.91 V), mass activity (108.1 A g –1 Pt ) and excellent stability. By its ascendancy in ORR, the Pt/GNs-300 exhibits a high open-circuit voltage of 1.41 V and a maximum power density of 198.6 mW cm −2 in Zn-air battery, implying its brilliant practicability. This work paves a pathway for achieving sinter-resistant metal-loaded catalysts in energy electrocatalysis.
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Cell Reports
·
2024
·
IF 7.5
Chenyin Wang,Meigui Yang,Dongyao Liu,Chaogu Zheng
Summary Microbial metabolites that can modulate neurodegeneration are promising therapeutic targets. Here, we found that the short-chain fatty acid propionate protects against α-synuclein-induced neuronal death and locomotion defects in a Caenorhabditis elegans model of Parkinson’s disease (PD) through bidirectional regulation between the intestine and neurons. Both depletion of dietary vitamin B 12 , which induces propionate breakdown, and propionate supplementation suppress neurodegeneration and reverse PD-associated transcriptomic aberrations. Neuronal α-synuclein aggregation induces intestinal mitochondrial unfolded protein response (mitoUPR), which leads to reduced propionate levels that trigger transcriptional reprogramming in the intestine and cause defects in energy production. Weakened intestinal metabolism exacerbates neurodegeneration through interorgan signaling. Genetically enhancing propionate production or overexpressing metabolic regulators downstream of propionate in the intestine rescues neurodegeneration, which then relieves mitoUPR. Importantly, propionate supplementation suppresses neurodegeneration without reducing α-synuclein aggregation, demonstrating metabolic rescue of neuronal proteotoxicity downstream of protein aggregates. Our study highlights the involvement of small metabolites in the gut-brain interaction in neurodegenerative diseases.
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PubMed
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Small
·
2025
·
IF 12.1
Xilong Chen,Zhili Yu,Xiangjie Li,Zhaoyu Sun,Guozheng Ma,Qiyun Li,Yingchun Ou,Yuxuan Liu,Renzong Hu
Ultrahigh-nickel layered oxide cathodes (≥90% nickel) possess exceptionally high discharge capacities, which can significantly improve the energy density of lithium-ion batteries and alleviate the driving range anxiety of electric vehicles. However, the high interfacial reactivity of ultrahigh-nickel cathodes, especially the detrimental side reactions with harmful acidic species like HF in the electrolyte, can deteriorate the battery interface and reduce the cycle life, hindering their practical application. In this study, 3-isocyanatopropyltrimethoxysilane (PTTS-NCO) is introduced as the electrolyte additive, which can effectively scavenge the harmful acidic species in the electrolyte and form a protective surface layer at the electrode/electrolyte interface, thereby enhancing the electrochemical performance of the battery (NCM90/Li). Specifically, the most effective battery based on the PTTS-NCO additive can maintain 70.3% of its capacity after 500 cycles at 30 °C. Even under a high cathode loading (3.0 mAh cm −2 ), it can retain 86.2% of its capacity after 300 cycles, far exceeding the base battery. Furthermore, it exhibits good performance under the harsh high-temperature environment, maintaining over 70.3% capacity retention in the NCM90/Li battery up to 350 cycles at 60 °C. This work demonstrates the great potential of multifunctional siloxane additive in lithium batteries based on ultrahigh-nickel cathode.
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CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Lipeng Wu,Xiaomin Wang,Pengwei Zhao,Yongsheng Ji,Bin Li,Yongsheng Xu,Tao Liao,Qing Xia,Yang Li,Xiaobin Fan,Wenchao Peng
Atomic Zn-N-C materials are synthesized by direct carbonization of ZIF-8, which maintains the rhombic dodecahedron morphology (RDM) with abundant nanopores. Zn-N-C-RDM shows enhanced catalytic activity with bisphenol A (BPA) as model pollutant and peroxydisulfate (PDS) as oxidant. Molecular dynamic (MD) calculations show that mean square displacement (MSD) of PDS, BPA, and H 2 O molecules in the nanotunnels decreases obviously with smaller pore size. Due to the confinement, the BPA ( d i = 1.0 nm) and PDS ( d i = 0.5 nm) can easily enter and confined in the cavities of Zn-N-C-RDM. PDS can be therefore activated more easily to degrade BPA due to their faster diffusion and shorter transfer routes. > 97 % degradation of BPA can therefore be achieved by Zn-N-C-RDM within 20 min. Quenching experiments, electron paramagnetic resonance (EPR) and open circuit potential (OCP) results indicate that O 2 •− radical dominate the degradation. According to the density functional theory (DFT) results, the binding sites of Zn-pyridinic N are the main active sites. This work provides new insights for improving activity in Fenton-like reactions in the field of environmental remediation.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Danqiang Huang,Xiangyun Zhang,Jianfeng Dai,Zizhou Yuan
The rapid advancement of wireless communications, radar systems, and electronic devices has resulted in a substantial increase in electromagnetic interference (EMI), which poses a threat to electronic device performance and human health. This study addresses the urgent need for lightweight materials with strong absorption capacities, wide absorption bandwidths, and low thickness values. For this purpose, ZIF-67-derived C/Co nanofibers were synthesized via electrospinning, dipping, and high-temperature carbonization. Co 2+ ions were pre-anchored and encapsulated in polyacrylonitrile (PAN) fibers and are grown by immersion in an organic ligand. Utilizing 0.4 g of cobalt nitrate hexahydrate, the amount of encapsulated Co 2+ was optimized to provide the greatest electromagnetic wave absorption performance. Under these conditions, the reflection loss was −49.45 dB, and the maximum effective absorption bandwidth was 6.48 GHz, thereby covering the entire Ku band. The composite material demonstrated a significant improvement in impedance matching and electromagnetic wave dissipation, which was attributed to the uniform dispersion of Co particles and the formation of multi-component heterogeneous interfaces. This study presents a pragmatic method for creating high-performance materials that could potentially reduce electromagnetic interference (EMI) in the aerospace, telecommunications, and defense sectors.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 16
·6965-6973
·
IF 3.5
Shan Wang,Zhihui Sun,Xuyang Zhao,Kunhua Li,Yafei Wang,Xijing Zhang
Many diseases are due to bacterial infections, which are treated by penicillin. Existing methods for penicillin detection have relatively high requirements for sample storage and processing, personnel professionalism, and instruments. Herein, water-soluble N–C quantum dots (QDs) from wheat straw were synthesized in a green way by using an efficient and simple method. The N–C QDs were modified with an imprinted layer by a gel–sol method. Penicillin selectively quenched the fluorescence emission of N–C QDs@MIP, and a linear relationship was obtained in the concentration range of 1.0 × 10−6–15.2 × 10−6 mol L−1. The reliability of the sensor in real sample analysis was satisfactory with results in the range of 93.6%–100%, and the sensor showed good reproducibility and long-term stability. The study provides a simple strategy to fabricate N–C QDs@MIP with a highly selective recognition ability and opens an avenue to develop highly efficient sensing probes for the detection of antibiotics in biological applications.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yan Sun,Aowen Chen,Jingdao Yang,Kun Zhang,Sikai Wang,Xuerong Xu,Luyue Niu,Yue Jing,Ci Wang,Jing Ren,Jianzhong Zhang
Expanding gain bandwidth into the L-band for erbium-doped fiber amplifiers (EDFAs) is a crucial strategy to overcome limitations in prevalent C-band focused commercial silica-based EDFAs, significantly boosting optical network transmission capacity. Herein, we synthesized Er 3+ -doped broadband near-infrared emission tellurite glasses utilizing the melt quenching process, systematically exploring the impact of ZnCl 2 on the glass structure and optical properties. The 82TeO 2 –3Nb 2 O 5 –15ZnCl 2 –3Er 2 O 3 (TNZ15) glass emerged as a standout candidate for broadband amplifiers around wavelength at 1.55 μm. With escalating ZnCl 2 concentration, a discernible red shift in the emission peak wave lines was observed, accompanied by an expansion of the full width at half maximum (FWHM) from 98 nm to 106 nm. Noteworthy characteristics of all samples included exceptional thermal stability and elevated near-infrared (NIR) transmittance. Application of the Judd-Ofelt (J-O) theory facilitated the calculation of J-O parameter intensity, providing deeper insights into the optical behavior of the materials. Finally, the evaluation of TNZ15 planar optical waveguides, employing the vertical top pumping mode of two 980 nm LEDs, encompassed both the C-band (1530–1565 nm) and the L-band (1565–1625 nm). The results underscore the potential of TNZ15 glass as a promising gain material for broadband optical amplifiers and lasers, offering valuable insights into the development of next-generation optical amplification technologies.
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CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Minghui Jiang,Xiao Liu,Shiyu Li,Yurui Xu,Simai Wang,Lei Lu,Xinxin Li,Xinru Sun,Chunlei Xia,Ziming Wang,Suping Cui
The internal water migration within calcium silicate hydrate (C-S-H) in dry environments is considered to be the primary factor affecting the volume stability of cementitious materials. In this research, the in-situ polymerization product of plant polyphenol tannic acid (TA) was applied to modify C-S-H based on an organic-inorganic composite modification method. The chemical structure, microstructure, composition, dimensional changes and water migration characteristics of modified C-S-H were analyzed. Experimental results showed that TA improved the polymerization degree of siloxane chains in the C-S-H nanostructure, with a maximum improvement of 80.70%, and increased the interlayer spacing in the C-S-H structure, confirming the modification of C-S-H at the nanoscale, exhibited by 29 Si Nuclear Magnetic Resonance (NMR), X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). This modification by TA optimized the C-S-H nanostructure and microscopic pores, and increased the interlayer and gel pore water content, especially gel pore water increased by 56.53% compared to that of the unmodified C-S-H, revealed by nitrogen adsorption and 1 H LF-NMR. In the dry environment, the blocking and cladding effects of TA on C-S-H effectively inhibited the gel water loss and reduced the drying shrinkage, especially at low TA concentration. This research aims to improve the volume stability of C-S-H by in-situ polymerization product of plant polyphenol, which provides new insights into improving the volume stability of cementitious materials.
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