MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Sefiu Abolaji Rasaki,Chunlei Zhao,Rui Wang,Jiacheng Wang,Heng Jiang,Minghui Yang
In this work, Ag/ZnO nanorods are prepared via simple and cost-saving liquid precipitation citrate reduction process (LPCR). The system shows appreciable catalytic activity for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) wherein NaBH 4 is used as electron sacrificer at ambience. It is found out that ZnO nanorods can effectively prevent Ag NPs agglomeration; a problem normally reduces active sites density. The coupling effect between the Ag NPs and ZnO greatly enhances electron transfer rate. This gives rise to high reduction rate constant ( k app ) of ˜3.97 × 10 −3 s −1 for the catalytic reduction of 4-NP. The result is about 1.9times better than that of Ag NPs (2.07 × 10 −3 s −1 ). The k app is well fitted into pseudo-first order kinetics with high correlation coefficient (R 2 ) of about 0.994, indicating chemisorptive reduction process. The remarkable performance obtained here is attributed to strong coupling effect between Ag NPs and ZnO nanorods derived from LPCR synthesis method.
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高影响因子
JOURNAL OF COORDINATION CHEMISTRY
·
2018
·
IF 1.703
Zi-Mei Ding,Wen-Li Cao,Xiao-Jing Hang,Xiao Ma,Hui Zheng,Kang-Zhen Xu,Jie Huang
The green nitrogen-rich coordination compound Cd(SCZ)2(AFT)2 (1) (AFT =4-amino-3-(5-tetrazolate)-furazan and SCZ = semicarbazide) was first synthesized and characterized by EA and Fourier Transform Infrared (FT-IR). The single crystal was cultivated and determined with X-ray diffraction. It revealed that 1 crystallizes in the monoclinic space group P21/c. A Cd2+ ion is coordinated by four N atoms and two O atoms to form a distorted octahedral structure. Among them, two nitrogen atoms are from the two AFT ions and the other four atoms are from two SCZ molecules. The thermal decomposition behavior of 1 was studied with DSC and TG-DTG methods. The apparent activation energy (E), thermal stability, and safety parameters (T
SADT, T
TIT, and T
b) were calculated for 1. Moreover, entropy of activation (ΔS
≠), enthalpy of activation (ΔH
≠), free energy of activation (ΔG
≠), specific heat capacity (C
p), and impact sensitivity were also discussed in detail.
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高影响因子
Analytical Methods
·
2012
·Vol. 4
·期 5
·1445-1451
·
IF 1.547
Huanshun Yin,Xiaomeng Meng,Zhenning Xu,Lijian Chen,Shiyun Ai
A selective and sensitive electrochemistry method was developed for the determination of phenacetin on CdSe microspheres modified glassy carbon electrode (GCE). The electrode exhibited an effectively catalytic response to the oxidation of phenacetin, which was testified by the increased oxidation peak current and the decreased oxidation peak potential compared with the bare GCE. The scan rate investigation demonstrated that the electrochemical oxidation was an adsorption-controlled process in the range from 20 to 500 mV s−1. Under optimal determination conditions, the oxidation peak current of phenacetin was proportional to its concentration in the range of 0.5 to 800 μM. The limit of detection was estimated to be 0.1 μM (S/N = 3). The developed method showed good reproducibility, acceptable stability and excellent anti-interference performance. The fabricated electrode was successfully used to determine phenacetin in pharmaceutical formulation samples.
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高影响因子
CELLULOSE
·
2023
·Vol. 30
·期 6
·3729-3743
·
IF 5.7
Zhang Cuizhi,Gao Kairu,Chu Xiaomeng,Liu Shaojie,Li Peixin,Tang Erjun
Polyamidoamine (PAMAM) encapsulated nano-Ag is a highly efficient catalyst for the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP) in water. However, PAMAM is easily soluble in water, making the nano-Ag catalyst difficult to recycle. In this work, carboxymethyl cellulose (CMC) was oxidized by sodium periodate to obtain oxidized carboxymethyl cellulose (CMC-CHO) containing aldehyde groups. PAMAM encapsulated nano-Ag (G4.0-PAMAM-Ag) was prepared with G4.0-PAMAM as template. Through the Schiff base reaction between CMC-CHO and G4.0-PAMAM-Ag, the CMC/PAMAM hydrogel loaded with nano-Ag (CMC-PAMAM-Ag) was prepared. The catalytic performance of CMC-PAMAM-Ag in the reduction of 4-NP to 4-AP in water was studied. It was found that its time required for accomplishing the reduction reaction was only 9 min, similar to that of free G4.0-PAMAM-Ag (8 min). Turnover frequency was as high as 169 h −1 , much higher than that of the cellulose/PAMAM composite supported nano-Ag (4.2 h −1 ) and dextrann/PAMAM hydrogel supported nano-Ag (40.2 h −1 ). The recovered hydrogel was characterized by X-ray photoelectron spectroscopy and it was found that the imine bonds in the fresh hydrogel were reduced to the amine bonds in the recovered hydrogel, improving the stability of hydrogel. The recovered hydrogel still had a good catalytic performance.
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高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Jun Sun,Tushagu Abudouwufu,Congcong Jin,Zhiyong Guo,Min Zhang
A new alkali-metal iodate, K6(IO6H4)(HI2O6)(HIO3)2(IO3)4·2H2O (KIOH), was successfully grown at room temperature by a slow evaporation method. To our knowledge, the title compound is the first alkali-metal iodate containing isolated [I5+O3] and [I7+O6] units in one structure. Both the bond valence sum and X-ray photoelectron spectroscopy confirmed this phenomenon, which is consistent with the single-crystal data. Also, the theoretical calculation results showed that the title compound is a potential birefringent material. What is more, the low-cost growth of centimeter-sized crystals for the title compound greatly enriches the structural chemistry of the iodate system.
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高影响因子
COMBUSTION AND FLAME
·
2020
·
IF 4.57
Qiang Lu,Wen-luan Xie,Bin Hu,Ji Liu,Wei Zhao,Bing Zhang,Ti-peng Wang
Pyrolysis of lignin involves complex unimolecular decomposition and bimolecular interaction mechanisms. Unimolecular decomposition of lignin model compounds has been widely investigated, while bimolecular interactions are far from well elucidated. Currently, only two radical reaction-based interactions, i.e., hydrogen abstraction and hydrogen-bond-induced homolysis mechanisms, have been proposed to explain the interactions in the lignin pyrolysis process, which ignores the concerted reaction-based interactions involving the pyrolytic products of lignin. Particularly, a large number of phenolics are produced in the pyrolysis of lignin, which can further affect the concerted pyrolysis reactions of lignin. In the present work, a novel interaction mechanism, phenolics-assisted hydrogen transfer (phenolics-AHT) process for the concerted reactions, is confirmed and carefully investigated. Phenylethyl phenyl ether (PPE), a typical β -O-4 lignin dimer, is used as the model compound to reveal the phenolics-AHT mechanism in the lignin pyrolysis system. Density functional theory (DFT) calculation, electrostatic potential (ESP) analysis, and fast pyrolysis experiment results are combined to reveal that the phenolic products participate in the hydrogen transfer process of the concerted Maccoll elimination reaction by means of their phenolic hydroxyl structures and significantly reduce the energy barrier, thus promoting the cleavage of the β -O-4 linkage. On the contrary, phenolics-AHT has no obvious effect on the concerted retro-ene fragmentation. At medium pyrolysis temperatures, the hydrogen transfer processes induced by phenolic products play a more significant role in the dissociation of the β -O-4 linkage than the hydrogen abstraction induced by radicals, due to the limited amount of free radicals . In addition, DFT calculation results further suggest that decarbonylation , decarboxylation , dehydration, tautomerism , and other concerted reactions can also be promoted by phenolics-AHT.
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高影响因子
Current Drug Delivery
·
2015
·Vol. 12
·期 6
·726-735
·
IF 1.478
Chenhui Wang,Changhui Yu,Kongtong Yu,Lesheng Teng,Jiaxin Liu,Xuesong Wang,Fengying Sun,Youxin Li
The use of biodegradable polymers such as PLGA to encapsulate therapeutic proteins for their controlled release has received tremendous interest. However, an acidic environment caused by PLGA degradation productions leads to protein incomplete release and chemical degradation. The aim of this study was to develop novel PCADK/PLGA microspheres to improve protein stability and release behavior. Bovine serum albumin (BSA) incubated in PCADK and PLGA degradation products was investigated using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), size exclusion chromatography (SEC-HPLC), circular dichroism (CD) and fluorescence spectroscopy. Blended microspheres of PCADK/PLGA were prepared in different ratios and the release behaviors of the microspheres and the protein stability were then measured. The degradation properties of the microspheres and the pH inside the microspheres were systematically investigated by scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM) to examine the mechanism of autocatalytic degradation and protein stability. BSA was more stable in the presence of PCADK monomers than it was in the presence of PLGA monomers, revealing that PCADK is highly compatible with this protein. PCADK/PLGA microspheres were successfully prepared, and 2/8 was determined to be the optimal ratio. Further, 43% of the BSA formed water-insoluble aggregates in the presence of PCADK/PLGA microspheres, compared with 57% for the PLGA microspheres, demonstrating that the BSA encapsulated in PCADK/PLGA blended microspheres was more stable than in PLGA microspheres. The PCADK/PLGA blended microspheres improved protein stability and release behavior, providing a promising protein drug delivery system.
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高影响因子
Journal of Materials Chemistry A
·
2024
·
IF 10.7
Jinping Mu,Xiaohui Li,Rui He,Lijing Sun,Xue Bai,Lihui Zhang,Xi Zhang,Zhenfa Liu,Jing Gao,Ai-Jia Wei
Spinel-type LiNi0.5Mn1.5O4 (LNMO) materials have attracted broad attention as components of rechargeable lithium-ion batteries (LIBs) due to their high energy density. However, continuous decomposition of electrolyte at high working voltage hinders its practical application in carbonate-solvent-based electrolytes. In this work, 4-methyl-1,3,2-dioxathiolane-2,2-dioxide (MDTD) was added as a functional electrolyte additive to the standard electrolyte (i.e., 1 M LiPF6–ethylene carbonate/ethyl methyl carbonate/dimethyl carbonate) to enhance the electrochemical performances of LNMO-based LIBs. Specifically, addition of a 0.5% additive in the standard electrolyte significantly improved the capacity retention of LNMO/Li half-cells from 78.5 to 95.8% after 500 cycles at 5 C, increased the capacity retention of LNMO/graphite full-cells from 70.8 to 80.9% after 100 cycles at 0.5 C, and enhanced the capacity retention of LNMO/LTO full cells from 37.2 to 81.8% after 200 cycles at 5 C. In addition, the standard electrolyte containing 0.5% MDTD also improved the cycling performance of LNMO/Li half-cells at 45°C, expanding the applicable temperature range. Comprehensive characterization combined with theoretical calculations allowed to reveal the action mechanism of the additive. In this mechanism, MDTD is decomposed subsequently involved in the decoration of the electrode–electrolyte interfacial films (for the LNMO, Li, and graphite electrodes), providing it with improved conductivity, protection, and resistance to electrolyte oxidation/reduction decomposition features. These findings suggest that use of the MDTD additive is a promising strategy to optimize high-voltage electrolytes for the industrialization of LNMO-based LIBs.
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高影响因子
Nuclear Science and Techniques
·
2025
·Vol. 36
·期 5
·1-13
·
IF 3.8
Dai Zhong-Qin,Chen Huan,Wen Zhao-Yin
Lithium- and manganese-rich (LMR) oxide cathode materials are among the most attractive candidates for next-generation energy-storage materials owing to their anomalous capacity. However, severe Mn dissolution that occurs during long-term cycling, which leads to capacity loss, hinders their application prospects. In this study, nanoscale \(\textrm{AlPO}_{4}\) -coated \(\textrm{Li}_{1.2}\textrm{Ni}_{0.13}\textrm{Co}_{0.13}\textrm{Mn}_{0.54}\textrm{O}_{2}\) (LMR@APO) with significantly enhanced electrochemical performance is successfully synthesized using a simple and effective sol–gel method to mitigate Mn dissolution and suppress local structural distortion at high voltages. Because of the complex evolution of the structure and oxidation state of LMR materials during electrochemical cycling, observing and analyzing them using traditional single characterization methods may be difficult. Therefore, we combine various synchrotron-based characterization techniques to conduct a detailed analysis of the electronic and coordination structures of the cathode material from the surface to the bulk. Synchrotron-based hard and soft X-ray spectroscopies are integrated to investigate the differences in O and Mn evolution between the surfaces and bulk of the cathode. Advanced synchrotron-based transmission X-ray microscopy combined with X-ray near-edge absorption-structure technology is utilized to visualize the two-dimensional nanometer-scale reactivity of the LMR cathode. The \(\textrm{AlPO}_{4}\) -coating layer can stabilize the surface structure of the LMR material, effectively alleviating irreversible oxygen release on the surface and preventing the dissolution of \(\textrm{Mn}^{2+}\) at the interface caused by side reactions after a long cycle. Therefore, the spatial reaction uniformity of Mn is enhanced by the \(\textrm{AlPO}_{4}\) -coating layer, and rapid capacity decay caused by Mn deactivation is prevented. The \(\textrm{AlPO}_{4}\) -coating method is a facile modification strategy for high-performance LMR materials.
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高影响因子
Advanced Biology
·
2025
·
IF 2.6
Xi-Ting Lv,Wen-Xiu Yang,Xiao Zhang,Bao-Ling Li,Wen-Ying Wang,Guo-En Wang
Guilongwan (GLW), a representative of traditional Chinese Medicine (TCM) has been utilized to treating diabetic foot ulcer (DFU)-related syndrome including an intolerance of cold with cold limbs, blood circulation disorder, and immune dysfunction for decades. However, the chemical and biological mechanisms of GLW remain unclear. This study aims to discover the biological mechanisms of GLW on DFU by using streptozotocin- and skin-puncher-induced DFU rat models, in vitro macrophage models, and in silico analysis. The alterations in pathology, Notch1 signaling, and macrophage polarization are detected. The results indicated that GLW promoted wound healing, cutaneous cell proliferation, and angiogenesis in DFU rats by inhibiting delta-like (DLL) 4/Notch1 signaling. In addition, GLW inhibited M1 polarization and promoted M2 polarization in diabetic wounds. Seventeen chemical compounds in GLW-medicated serum are identified. In silico analysis and in vitro experiments demonstrated that GLW-medicated serum and its main compounds inhibited the expression of DLL4 in matrix metalloproteinase-9-induced M1 macrophages. In conclusion, GLW ameliorated experimental DFU rats via the inhibition of DLL4/Notch1 signaling in M1 macrophages. This study provided a new biologic mechanism for GLW in the treatment of DFU.
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Caiwen Pan,Qinghong Shi,Xiaoyan Dong,Linling Yu,Yan Sun
Detoxification of the typical organophosphate pesticide methyl parathion (MP) is of great significance for environmental remediation and sustainable development. Hydrolysis of MP using organophosphate hydrolase (OPH) is an effective and environmentally friendly way to degrade MP, but the hydrolytic product, 4-nitrophenol (4-NP), is still toxic. The cascade conversion of MP to 4-NP followed by reduction to a low toxic product, 4-aminophenol (4-AP), is thus an attractive way to detoxify MP. Herein, we fabricated a highly active reduction-catalytic cupric metal–organic framework (MOF) (Cu-AZO), which exhibited over 6-fold higher activity than the previous Cu-AZB. Thus, a chemoenzymatic catalyst (OPH/Cu-AZO) for one-pot cascade MP conversion to 4-AP was constructed by in situ immobilization of the OPH in Cu-AZO. OPH/Cu-AZO displayed an enzyme loading capacity of 16–69 mg/g with an activity recovery of up to 252%, and an average cascade conversion rate of up to 41.7 μmol·min–1·gcatalyst–1. At the optimized conditions, OPH/Cu-AZO completely converted 50 μM MP to 4-AP within 3 min at a low reductant concentration (10 mM NaBH4) in the one-pot cascade reaction. Moreover, the hybrid catalyst retained 99% activity in 10 days storage and >65% activity in 10 recycles. The results proved that OPH/Cu-AZO was the most efficient chemoenzymatic catalyst reported so far in the cascade conversion of MP to 4-AP, underscoring its potential applications in the detoxification of MP.
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高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Feiyan Xie,Junqiang Gu,Jie Zhang,Yintong Chen,Run Yin,Junhao Li
Due to the lack of red light, currently available commercial phosphor-converted white light-emitting diodes (pc-WLEDs) have a poor color rendering index. In order to improve the color rendering performance of pc-WLEDs, it is urgent to develop satisfactory bright red emission phosphors. Herein, we reported a bright red luminescent Na5Lu(WO4)4:Sm3+ phosphor. By studying the effect of Sm3+ doping concentration on luminescence performance, it was found that the concentration quenching effect was attributed to the dipole–dipole interaction. The quantum yield, color purity, and CIE coordinates of the optimal Sm3+ concentration activated Na5Lu(WO4)4:9%Sm3+ phosphor were 49.37%, 95.12%, and (0.653, 0.346), respectively. Furthermore, the phosphor had strong resistance to thermal quenching, and the luminous intensity at 425 K was only reduced by 10.20% compared with that at 300 K, while maintaining excellent color stability (Δε = 9.27 × 10–3). Finally, we used Na5Lu(WO4)4:9%Sm3+ phosphor as the red component, and additionally added commercial blue and green phosphors, combined with the 365 nm near-ultraviolet chip to produce a white LED device with a CRI of up to 90.5 and a CCT as low as 4581 K. These results indicated that Na5Lu(WO4)4:Sm3+ phosphors had broad potential applications in high color rendering index white LEDs excited by near-ultraviolet light.
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高影响因子
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