CURRENT APPLIED PHYSICS
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2022
·
IF 2.856
Xiaoxue Lian,Yan Li,Yunling Zou,Dongmin An,Qiong Wang,Qingjun Zhou,Xueqi Li
The g-C 3 N 4 nanosheets were synthesized by a multistage program calcination with different heating rate, which was an easy, low-cost, and quick method. The morphology and structure of samples were characterized by various techniques. The performance evaluation of the samples was tested by degrading Rhodamine B, Methylene Blue, Tetracycline Hydrochloride and P-Nitrophenol in visible light . The results show that the photodegradation properties of TP-g-C 3 N 4 prepared by multistage program calcination are the best than others. In particular, the degradation rate of TP-g-C 3 N 4 to Rhodamine B reached 99.6% in just 4 min. TP-g-C 3 N 4 catalyst has excellent stability and recycling performance. According to free radical capture experiments, •O 2 − may be the main active species for pollutant degradation. The possible photocatalytic degradation mechanism was also discussed. Due to the high specific surface area and a narrow band gap, the TP-g-C 3 N 4 becomes a promising photocatalyst.
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高影响因子
CATALYSIS TODAY
·
2022
·
IF 6.562
Kuan Wang,Song-Song Li,Junlei Wang,Zhen-Hong He,Dan Wang,Rong-Rong Zhang,Weitao Wang,Yang Yang,Zhao-Tie Liu
Photothermal oxidation of cyclohexane with molecular oxygen in solvent-free is considered to be an efficient approach for the formation of cyclohexanone and cyclohexanol (KA oil), and possesses the potential to generate the next stage product of adipic acid (AA) by one-pot oxidation in chemical industry. Herein, a unique type of Co 8 La 1 O x /WO 3 Z-scheme nanocomposites with p-n heterojunction was successfully constructed by a facile process of solvothermal reaction in conjunction with the simple impregnation method. The Co 8 La 1 O x /WO 3 Z-scheme heterojunction nanocomposites achieved an excellent catalytic performance for the photothermal oxidation of cyclohexane at 120 ℃ under visible light in solvent-free conditions. Surprisingly, 10.35% conversion of cyclohexane with 98.75% selectivity of KA oil (liquid, 80.97%) and AA (solid, 17.78%) was achieved during the reaction time of 3 h. Moreover, the desirable durability and stability of the Co 8 La 1 O x /WO 3 composites demonstrated a potential application as an industrial catalyst. The outstanding catalytic performance of the Co 8 La 1 O x /WO 3 composites could be ascribed to the enhanced electron excitation capacity, the accelerated electron-hole separation and migration, the inhibited charge recombination, the strong visible-light absorption, and the efficient synergetic catalytic effect of photo-thermo. Besides, high oxygen adsorption capacity and large specific surface area of the Co 8 La 1 O x /WO 3 composites can efficiently build a bridge between cyclohexane and O 2 to fully utilize the oxygen participation in the oxidation. The present approach provides a promising perspective for the designing and constructing of Z-scheme heterojunction catalyst with a high-efficiency photo-thermo catalytic performance in the oxidation of cyclohexane to KA oil and AA in chemical industry.
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高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
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2022
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IF 5.062
Yameng Zhu,Mengmeng Zhang,Shujie Wei,Boyao Wang,Jun He,Xilong Qiu
Hollow mesoporous silica nanoparticles (HMSN) have been widely studied as drug delivery carriers due to their high drug loading capacity in the internal cavity. In this study, monodisperse and temperature-responsive hollow mesoporous silica nanoparticles ( [email protected] (NIPAM- co -NHMA)) were synthesized and investigated. HMSN and [email protected] (NIPAM- co -NHMA) were characterized by SEM, TEM , FT-IR, TGA, XRD and nitrogen adsorption-desorption isotherms. The results showed that the cross-linked temperature-sensitive polymer P(NIPAM- co -NHMA) was grafted onto the surface of HMSN. Subsequently, using puerarin (PUE) as the drug model, the results demonstrated that the [email protected] (NIPAM- co -NHMA) had an excellent loading efficiency and exhibited excellently temperature-sensitive release behavior. Furthermore, the biocompatibility and stability of HMSN and [email protected] (NIPAM- co -NHMA) were studied by MTT assay and hemolysis assay, the results indicated [email protected] (NIPAM- co -NHMA) possessed excellent biocompatibility and stability. Thus, we have successfully synthesized [email protected] (NIPAM- co -NHMA), and the drug release is temperature-responsive, which can realize controlled drug release .
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高影响因子
Biomaterials Advances
·
2022
·
IF 0
Lichao Chen,Bo Wang,Haohao Ren,Yanan Wu,Defu Lyu,Yanan Ouyang,Qiyi Zhang,Yonggang Yan
Poly-amino acid (PAA) is a promising biomaterial in biomedical engineering due to its similar amide bond structure to collagen and excellent biocompatibility, but the lack of osteogenic activity and inferior mechanical strength limit its long-term application in orthopedics. In this study, a poly-amino acid/poly (p-benzamide) (PAA-PBA) copolymer with high mechanical strength was designed and fabricated by the method of solution polymerization. The chain structures, thermal properties and mechanical properties of these polymers were evaluated and results showed that PBA greatly promoted the mechanical properties of PAA, and the copolymer performed the maximum mechanical strengths with compressive strength, bending strength and tensile strength of 123 MPa, 107 MPa and, 95 MPa, respectively. To increase the bioactivity of surface, a bioactive coating that consists of poly-(dopamine) (PDA) nanolayers and tripeptide Arginine-Glycine-Aspartic acid (RGD) on sulfonated PAA-PBA copolymer was created. A porous structure appeared on the surface after modification, the surface roughness and hydrophilicity of copolymer has been improved obviously after introducing PDA and RGD peptide coating. The in vitro bioactivity evaluation demonstrated that the RGD-functionalized sample showed a significantly improved ability to promote bone apatite mineralization, cell adhesion, proliferation and osteogenic differentiation. In a word, such a strategy of material synthesis and surface modification method shows a great potential for broadening the use of PAA in the application of load-bearing bone substitute biomaterials.
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PubMed
NEW JOURNAL OF CHEMISTRY
·
2022
·Vol. 46
·期 14
·6461-6469
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IF 3.925
Li'an Peng,Yongxiao Tuo,Yan Lin,Cuiping Jia,Shutao Wang,Yan Zhou,Jun Zhang
Nickel sulfide (NiS) has sparked considerable interest as a promising electrode material for supercapacitors. However, the poor electrical conductivity and unstable structure during the continuous charge–discharge process have limited its practical applications to a great extent. Herein, we report a two-step solvent-thermal method to synthesize phosphorus-doped NiS nanocrystals (P-NiS). The bulk doping of P not only enhances the electrical conductivity and increases the number of electrochemical active sites, but also strengthens the structural stability of the NiS nanomaterial. As a result, the synthesized P-NiS demonstrated an impressive electrochemical performance with a high specific capacity (727.79 C g−1), superior rate performance (50.60% capacity retention at 50 A g−1), and excellent cycling stability (93.10% capacity retention after 3000 cycles). Furthermore, a hybrid supercapacitor (HSC) of P-NiS//AC was assembled in a 2 M KOH electrolyte. It delivered a maximum energy density of 39.80 W h g−1 at the power density of 809.50 W kg−1 and cycling stability with 89.70% capacity retention after 6000 cycles at 1.6 V. This study provided an effective strategy to achieve the bulk doping of heteroatoms into the transition metal sulfides for improving the intrinsic properties of electrodes in electrochemical energy-storage devices.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2023
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IF 6
Mengjin Zhou,Xiaomin Qiu,Yajuan Qu,Yangyang Liu,Zhaoyou Zhu,Yinglong Wang,Peizhe Cui,Jingwei Yang
P-xylene, n-propanol and water are widely present in the petroleum production process, so the effective separation of these substances is of great significance to environmental protection and resource conservation. In this study, deep-eutectic solvents (DESs) were used to separate the n-propanol/p-xylene/water ternary azeotrope system for the first time and compared with the commonly used solvents. The difficulty of forming hydrogen bonds and the interaction between the extractants and the system to be separated were determined by quantum chemical calculations. Quantitative analysis was performed using σ-profile, interaction energy and electrostatic potential (ESP) energy. The order of interaction strength was N-formylmorpholine (NFM) > cyclohexanol, (DL-Menthol/Lauric acid) 2:1 (DES 1 ) > (DL-Menthol/Decanoic acid) 1:1 (DES 2 ). Qualitative analyses were performed using interaction region indicator (IRI) and independent gradient model based on Hirshfeld partition (IGMH). It can be visually shown that the H atoms on the hydroxyl groups of n-propanol play a major role in the interaction, and all form hydrogen bonds with the O atoms of the entrainers. Finally, phase equilibria data for entrainers and azeotropes were supplemented with the improved new Rose VLE kettle. A series of relevant calculations and experimental data show that the selected four extractants can achieve component separation. Among them, NFM and DES 1 are the best extractants. This study provides a solvents screening process through quantum chemical calculations and phase equilibrium experimental multi-scale studies, which provide guidance for the application of solvents screening and DESs in extractive distillation separation processes.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2023
·
IF 6.2
Meng Zhu,Dong-Xing Tan,Xiang-Yu Wang,Qing-Nan Bian,Ben-Shuai Guo,Yan-Min Liu,Gao Deng,Yuan-Yuan Feng
Water electrolysis to produce high-purity hydrogen has been regarded as the most promising and attractive method for renewable energy production. The intrinsic high kinetic barrier of the involved electrode reactions, especially that of the anodic oxygen evolution reaction (OER), however severely hinders the application of the water electrolysis technology for large scale hydrogen production. In this paper, a nano-composite Fe- and Co-based material containing crystalline metal sulfide ((NiFeCo)S) and amorphous metal phosphide ((FeCo)P) was in-situ grown on the surface of foam nickel (NF). The (FC)P-(NFC)S/NF catalyst exhibits ultra-high activities for OER at high current densities in 1.0 M KOH, delivering 500 and 1000 mA cm −2 at ultralow overpotentials of 274 and 280 mV, respectively with a small Tafel slope of 37.8 mV dec −1 . The excellent catalytic activities of (FC)P-(NFC)S/NF far exceed those of the reference single-component (FC)P/NF and (NFC)S/NF catalysts, and also exceed those of most non-noble metal catalysts reported in literature. Besides, the (FC)P-(NFC)S/NF catalyst exhibits high stability with almost no significant activity attenuation after the chronopotentiometric test at both 100 and 500 mA cm −2 for 40 h. The synergistic effects between the metal sulfide and metal phosphide have positive impacts on the OER activity through increasing the surface area, enhancing the reactivity of each active site, improving the electrical conductivity as well as the interface between the crystalline and amorphous phases. The present work provides a new strategy to develop cost-effective and efficient electrocatalysts toward OER and water electrolysis.
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高影响因子
Polymers
·
2023
·Vol. 15
·期 10
·2384
·
IF 5
Siyuan He,Cheng Chi,Chaohua Peng,Birong Zeng,Yongming Chen,Zhongxi Miao,Hui Xu,Weiang Luo,Guorong Chen,Zhenping Fu,Lizong Dai
It is still extremely challenging to endow epoxy resins (EPs) with excellent flame retardancy and high toughness. In this work, we propose a facile strategy of combining rigid–flexible groups, promoting groups and polar phosphorus groups with the vanillin compound, which implements a dual functional modification for EPs. With only 0.22% phosphorus loading, the modified EPs obtain a limiting oxygen index (LOI) value of 31.5% and reach V-0 grade in UL-94 vertical burning tests. Particularly, the introduction of P/N/Si-containing vanillin-based flame retardant (DPBSi) improves the mechanical properties of EPs, including toughness and strength. Compared with EPs, the storage modulus and impact strength of EP composites can increase by 61.1% and 240%, respectively. Therefore, this work introduces a novel molecular design strategy for constructing an epoxy system with high-efficiency fire safety and excellent mechanical properties, giving it immense potential for broadening the application fields of EPs.Keywords:flame retardant;vanillin;epoxy resin;synergistic effect;strength and toughness
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
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IF 5.316
Xijun He,Xiaodong Wang,Ming Tang,Han Zhang,Yu Wang
Searching for high specific capacity anode materials with an optimized structure to achieve high energy density , long cycling life-span, and high rate performance for lithium-ion batteries (LIBs) is a pressing assignment. Metal phosphides have aroused much attention, however, enormous volume variations, poor electrical conductivity , and aggregation of nanoparticles hamper their practical applications. Herein, ZnP 2 nanoparticles grown on N, P co-doped carbon nanofibers (ZnP 2 @NPCNFs) composite synthesized by electrospinning and heat treatment is reported to directly act as binder-free anode in LIBs. The 3D self-standing ZnP 2 @NPCNFs featuring good flexibility can not only boost conductivity and alleviate the volumetric fluctuations in the cycling course, but also buffer the agglomeration and pulverization of nanoparticles. Lithium storage of ZnP 2 @NPCNFs electrode obey the conversion reaction mechanism. Besides, the additional lithium intercalation active sites created by the doped-nitrogen and the existence of P C bond along with the space-confined effect of NPCNFs are conjointly beneficial to endow the ZnP 2 @NPCNFs electrode with distinctive electrochemical properties . When assembled as the anode, the ZnP 2 @NPCNFs electrode reached a high reversible capacity of 746 mA h g −1 after 100 cycles at 0.2 A g −1 and 406.49 mA h g −1 after 1000 cycles at 2 A g −1 . Electrochemical tests manifest that most of the capacity contribution comes from capacitive process. Moreover, the similar superior electrochemical performances are obtained in the LiFePO 4 //ZnP 2 @NPCNFs full cell. Generally, this study widens researchers’ horizons to conceive rational structure of metal phosphides anodes in LIBs with high capacity conservation.
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高影响因子
Molecular Medicine Reports
·
2021
·Vol. 25
·期 2
·1-9
·
IF 2.952
Fa-Xiu Chen,Qin Wan,Qing-Ling Li,Jing Fang,Le Peng,Jian Hu
The function of substance P (SP) in myocardial ischemia is well understood, but its effects on congestive heart failure are unclear. The present study aimed to use in vitro and in vivo approaches to investigate the effects of SP on doxorubicin‑induced cardiomyocyte injury. Pathological changes, apoptosis, cardiomyocyte ultrastructure and molecular mechanisms were evaluated in vitro and in vivo. The effects of SP on cell viability of H9c2 myocardial cells were evaluated using the Cell Counting Kit‑8 and flow cytometry. B‑cell lymphoma 2 (Bcl‑2), Bcl‑2‑associated X protein (Bax), Beclin‑1 and microtubule‑associated protein 1A/1B‑light chain 3 (LC3) were detected by western blotting. Heart failure in rats was established by intraperitoneal injection of doxorubicin. The in vitro data demonstrated that SP at concentrations of 1 µg/ml inhibited doxorubicin‑induced apoptosis of H9c2 cells. Administration of doxorubicin reduced Bcl‑2, Beclin‑1 and LC3 expression levels in H9c2 cells, while having no effect on Bax levels. Administration of SP to these doxorubicin‑treated cells did not affect Bcl‑2 or Bax expression, but further reduced Beclin‑1 while inhibiting the reduction in LC3 expression. In vivo, food intake was significantly increased in rats in the SP group compared with the model group. Cardiomyocytes in the heart‑failure group underwent dysfunctional autophagy as ascertained by transmission electron microscopy. Compared with the heart‑failure group, these pathological changes, including loss of striations and vacuolation, were inhibited by SP treatment, which promoted Bax expression, reduced Beclin‑1 expression and inhibited the reduction in LC3 expression. Taken together, SP reduced cardiomyocyte apoptosis in doxorubicin‑induced cardiomyocyte injury, likely by promoting autophagy, which suggested that SP is a potential therapeutic target for doxorubicin‑induced heart failure.
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PubMed
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2021
·
IF 5.03
Weimiao Lu,Zhenfu Jin
Intumescent flame retardants (IFR) with phosphorus (P)/nitrogen (N)-containing diphenols (DH, DV and DS) were synthesized from p -hydroxybenzaldehyde (H), vanillin (V) and syringaldehyde (S) with different methoxyl groups on its aromatic ring. The FTIR, 1 H NMR, 13 C NMR, XPS methods were used to characterize the structures of IFR, and LOI, CCT, SEM, TG methods were used to investigate the flame retardancy and thermal stability of rigid polyurethane (RPU) foams when the three IFR were incorporated into RPU foams. Compared with H, V and S, the DH, DV and DS FTIR spectra showed absorption peaks at 3450 cm −1 , 1160 cm −1 , and 1222 cm −1 , 1050 cm −1 and 740 cm −1 , respectively, which attributed to N H, C N, and P = O , P-O, P-C groups. The 1 H NMR spectra of DH, DV and DS showed proton signals at 4.8 and 6.0 ppm, which were corresponding to H1 and H2 of C N groups, and corresponding C1 signal appeared around 62.3 ppm in the 13 C NMR spectra. The XPS spectra of DH, DV, DS showed peaks at 285, 398 eV and 133.5, 532 eV, which may be due to corresponding C1s, N1s of C N groups and P2p and O1s of P-O-C groups, respectively. These results indicated that the target compounds P/N-containing diphenols DH, DV and DS were synthesized successfully. Flame retardancy index (FRI) values of RPU-DH, RPU-DV, and RPU-DS were 2.33, 2.30 and 2.43, respectively, suggesting that DH, DV, and DS were good flame retardant additives. The THR and HRR values of RPU-DH, RPU-DV, RPU-DS foams were much lower than that of RPU foam. The fire growth rate (FIGRA) of RPU-DH, RPU-DV, and RPU-DS was 29.4%, 30.3%, and 24.4% lower comparing to RPU foam. The LOI value of RPU foam was 19%, while LOI values of RPU-DH, RPU-DV and RPU-DS foams increased to around 26%. These results suggested that the flame retardancy of RPU foams were improved by incorporating DH, DV, and DS. Compared with RPU foam, the CY 600 of RPU-DH, RPU-DV and RPU-DS foams increased by 215.2%, 152.2% and 195.6%, respectively, and the char residue after CCT were much compact and homogeneous, which could reduce heat and mass transfer, protecting underlying materials from further combustion in a fire. In conclusion, the P/N-containing diphenols DH, DV and DS were synthesized successfully, and they were good flame retardant additives. The char residue of RPU-DH, RPU-DV and RPU-DS foams increased remarkably, and formed compact and homogeneous char layer. The flame retardancy and thermal stability of RPU-DH, RPU-DV, RPU-DS foams were improved by incorporating DH, DV, and DS.
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ChemCatChem
·
2021
·Vol. 14
·期 1
·e202101311
·
IF 5.686
Hang Yu,Ximeng Zhao,Feichao Wu,Yuhong Luo,Aizhong Jia,Yanji Wang,Jingde Li
Graphical Electrocatalysis : This work is about the development of the 3DOM Co/NPC@TiO 2-x ORR electrocatalyst. The unique TiO 2-x -based 3DOM structure and the synergistic between N, P co-doping and Co-decoration contribute to improve the ORR catalytic activity and stability. The proposed electrocatalyst exhibits an outstanding half-wave potential of 0.86 V in alkaline electrolyte. The resulting primary and flexible zinc-air batteries also deliver considerable performance. Developing efficient and durable electrocatalysts of oxygen reduction reaction (ORR) is critical for high-performance air cathodes. Herein, a novel three-dimensionally ordered macroporous oxygen-deficient TiO 2 framework embedded with N, P and Co-tridoped carbon (3DOM Co/NPC@TiO 2-x ) is elaborately designed for ORR. This unique structure offers a high surface area, good mass transfer, excellent electronic conductivity, and stability. Moreover, the experimental and theoretical studies reveal that the synergistic effect of N, P co-doping and Co-decoration is indispensable to promote the ORR performance, yielding high O 2 adsorption energy and lowering the reaction barriers simultaneously. Accordingly, the ORR catalytic activity and stability of the proposed electrocatalyst are better than Pt/C in alkaline media. The resulting primary zinc-air battery delivers a high open-circuit voltage (1.50 V) and specific capacity (820 Wh kg −1 ) at 20 mA cm −2 . This strategy, combining macroporous oxygen-deficient oxide support with binary heteroatom doping, provides a new perspective for exploiting efficacious ORR electrocatalysts.
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