INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2023
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IF 1.9
Ting Hu,Yujun Wang,Jingwei Lin,Zhanyong Wang
Poly(butylene succinate) (PBS), poly(hexamethylene succinate) (PHS) and three kinds of poly(butylene succinate-co-hexamethylene succinate)s (P(BS-co-HS)s) were enzymatically hydrolyzed by Fusarium solani cutinase. The results showed that the characteristics of the enzymatic hydrolysis of these polyesters were mainly affected by crystallinity, thermal properties and the BS/HS ratio. The enzymatic hydrolysis rates of the polyesters are as follows: P(BS-co-HS52) ≈ P(BS-co-HS71) > PHS > P(BS-co-HS32) > PBS. Furthermore, with increasing HS content, both the degree of crystallinity (Xc) and melting temperature (Tm) of the polyesters first decreased and then increased. P(BS-co-HS52) and P(BS-co-HS71) had the lowest Xc and the lowest Tm, thus had the highest hydrolysis rate; this shows that the hydrolysis rate is affected by Xc and Tm. The results also showed that BS/HS ratio could affect the physical properties and degradability of polyesters. Thus, it is possible to prepare polyesters with various physical properties and degradability for different applications by adjusting BS/HS ratio. The crystalline and amorphous regions of the polyesters were both hydrolyzed, during which parts of the crystalline regions were converted into the amorphous regions. Finally, we found that the crystal structure and thermal stability of the polyesters were not affected by the enzymatic hydrolysis.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
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IF 9.965
Yaru Shang,Chunliang Wang,Chunshuang Yan,Fengyang Jing,Morteza Roostaeinia,Yu Wang,Gang Chen,Chade Lv
The design of multifunctional photocatalyst with strong redox performance is the key to achieve sustainable utilization of solar energy. In this study, an elegant S-scheme heterojunction photocatalyst was constructed between metal-free graphitic carbon nitride (g-C 3 N 4 ) and noble-metal-free tungsten oxide (W 18 O 49 ). As-established S-scheme heterojunction photocatalyst enabled multifunctional photocatalysis behavior, including hydrogen production, degradation (Rhodamine B) and bactericidal (Escherichia coli) properties, which represented extraordinary sustainability. Finite-difference time-domain (FDTD) simulations manifested that the integration of double-layer hollow g-C 3 N 4 nanotubes with W 18 O 49 nanowires could expand the light harvesting ability. Demonstrated by density functional theory (DFT) calculations and electron spin resonance (ESR) measurements, the S-scheme heterojunction not only promoted the separation of carriers, but also improved the redox ability of the catalyst. This work provides a theoretical basis for enhancing the photocatalytic performances and broadening the application field of photocatalysis.
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PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
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IF 7.392
Cai Xu,Liyan Dai,Yingqi Chen,Shaoyong Zhang,Chaozheng He,Xiaozhong Wang
WO 3 -WS 2 supported on mesoporous N, S co-doped carbon were prepared via one-step molten-salt strategy, and an enhanced interfacial interaction between metal and carbon was formed, which boosted the selective oxidation of benzyl alcohol to benzaldehyde. Under green conditions (solvent: H 2 O, oxidant: H 2 O 2 , no base-additives), 96.2 % conversion and 97.0 % selectivity were achieved within 2 h. It was found that N, S co-doped carbon with abundant mesopores served as an excellent support, the pyrrolic and graphitic N species of carbon provided main anchoring sites for metal nanoparticles. Additionally, the N, S co-doped carbon support could effectively promote the distribution of metal species, and thereafter induced the formation of metal–carbon interfacial interaction. Such advantages resulted in the satisfactory reusability (negligible activity loss after six cycles) and remarkable catalytic activity. The scavenger tests and EPR results disclosed that ·OH was the main oxidative species for this reaction. DFT calculations revealed that co-doping of N, S into carbon promoted the adsorption of benzyl alcohol, and the enhanced metal–carbon interaction reduced migration energy barrier of ·OH on catalyst surface. In sum, this work provided some new insights into the interfacial interaction of mesoporous carbon supported metal catalyst for boosting the selective oxidation of alcohols.
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Journal of Materials Chemistry A
·
2023
·Vol. 11
·期 5
·2233-2245
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IF 11.9
Ke Tan,Zhaolin Tan,Sen Liu,Guoqiang Zhao,Yang Liu,Linrui Hou,Changzhou Yuan
Li–S batteries (LSBs), owing to their superior energy density, cost-efficiency, and environment-friendliness, are established as one of the most potential next-generation electrochemical energy storage systems. However, the shuttle effect of lithium polysulfides (LPSs) and the poor conductivity of active substances are the main challenges to their practical applications. Herein, we propose a synergistic strategy involving heterogeneous and homogeneous catalysts. First, MIL-47 as-derived core–shell carbon nanorods decorated with a V3S4 nanosheet shell (V3S4@C) were smartly constructed and applied as the host material for sulfur cathodes. The resulting V3S4@C not only enhanced the electronic conductivity of the integrated cathode but promoted LPSs chemisorption and conversion as heterogeneous catalysts. The optimized Co(C5H5)2 was further introduced into the electrolyte as a homogeneous catalyst, improving the conversion efficiency of LPSs and electrolyte wettability. Benefiting from the synergistic contributions of the V3S4@C host and the homogeneous catalyst Co(C5H5)2, the assembled LSBs with S/V3S4@C as the cathode exhibited outstanding long-life cycling performance and high-rate behavior, particularly in cases with high sulfur loading and low electrolyte dosage. More significantly, our work promises a feasible pathway for commercial applications of advanced LSBs.
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高影响因子
FUEL
·
2023
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IF 7.4
Hongmin Cui,Jinsong Shi,Jianguo Xu,Nanfu Yan,Yuewei Liu
In the current work, we proposed the use of two organic potassium salts, 4-morpholineethanesulfonic acid (MES) potassium salt and 1,4-piperazinediethanesulfonic acid (PIPES) dipotassium salt, as novel and tri-functional activators for the synthesis of N, S co-doped carbons (NSCDCs). The organic potassium salts served as activator and N/S source at the same time, allowing direct synthesis of NSCDCs with N/S free precursor. In order to verify this hypothesis, N,S free hydrochar derived from glucose was selected as the carbon source. NSCDCs with high and tunable surface area (1673–2235 m 2 /g), N content (3.44–5.80 wt%), and S content (5.26–8.72 wt%) were obtained. Physicochemical properties of the carbons were mainly decided by potassium salt and activation temperature. The NSCDCs were also investigated for their CO 2 adsorption properties. At 25 °C and 1 bar, high CO 2 uptake of 3.04–3.99 mmol/g was achieved by the carbons. Q st of the NSCDCs was 22.6–28.7 kJ/mol, and CO 2 adsorption selectivity over N 2 was 10.5–17.3 at 25 °C and 1 bar. At 25 °C and 20 bar, CO 2 uptake increased to 11.26–17.29 mmol/g, and exhibited linear dependence on specific surface area. The current work indicated that MES potassium salt/PIPES dipotassium salt could be used as activator for convenient synthesis of NSCDCs as efficient CO 2 adsorbents.
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高影响因子
MRS Communications
·
2023
·Vol. 13
·期 2
·268-275
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IF 1.9
Qiao Xinfeng,Hu Chuanlin,Yao Shun,Wang Fazhou
This study is to explore the micro-mechanical properties of C–S–H modified by various carbon nanotubes and the correlation with the nano/micro-structures. The results show that carboxyl-functionalized single-walled carbon nanotubes provide the great template for the growth of C–S–H and reduce the porosity and surface defects of C–S–H particles. The highly ordered and dense layered structure of C–S–H greatly improves its micro-mechanical properties. In addition, the functional groups (–COOH) of functionalized carbon nanotubes can combine with the Ca–O bond of C–S–H to change the interlayer spacing of C–S–H, and the effects are particularly significant at low Ca/Si. Graphical abstract
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高影响因子
WATER AND ENVIRONMENT JOURNAL
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2022
·Vol. 37
·期 2
·316-325
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IF 1.977
Bo Xing,Chaoting Fu,Guo Yang,Xiang Song,Xingyong Liu,Xiaonan Liu,Qiang Zhou,Zhongcai Pan,Junjie You,Yuling Ye
N,S-codoped mesoporous carbon (S/NMC) as an effective catalyst toward the catalytic persulfate oxidation of sulfamethazine (SMZ) was fabricated conveniently using vinasse as the C/N source, Na 2 S as the S precursor and nano-SiO 2 as the template, respectively. The effect of S precursor dosage on the textural properties and surface chemistry of S/NMCs were characterized by N 2 adsorption/desorption, Raman spectra, X-ray diffractometer (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). It was found that more S precursor dosage presented an enhanced SMZ degradation performance due to the significant role of more S precursor dosage: (i) larger specific surface area and (ii) more active surface groups including pyridine N, graphite N, quinone-like O and thiophene-like S. In addition, quenching experiments showed that free radical and nonradical oxidation processes are the main processes of SMZ degradation. The findings provided a new idea for the resource utilization of vinasse and the development of catalytic persulfate oxidation of organic pollution.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Xinran Hu,Helong Jiang,Xiangcun Li,Jiawei Mu,Gaohong He,Miao Yu
Li–S batteries still have various problems, including volume expansion, low S conductivity, and shuttling effect of polysulfides (LiPSs), requiring resolution. Herein, polyvinylidene fluoride (PVDF) is combined with carbon nanotubes (CNTs) and Fe2O3 through a one-step phase-inversion process to form a highly flexible and conductive membrane as a functional Li–S battery interlayer. The CNT skeleton is tightly entangled and crosslinked by PVDF to form a hierarchically porous framework, which is suitable for fast Li+ and electron transport and volumetric expansion of S and facilitated electrolyte diffusion. Additionally, the strongly negative F atoms can accelerate Li+ transport, promoting the fast redox reaction between S species and Li+. Furthermore, the uniformly doped Fe2O3 nanoparticles provide abundant active sites and broad reaction interfaces for highly efficient LiPS anchoring and catalytic conversion. Li–S batteries with the membrane as the interlayer exhibit an excellent cycle performance and reversible capacity of 631.2 mAh g–1 after 400 cycles at 1 C. Furthermore, in situ Raman spectroscopy shows that long-chain Li2S8 decreases, indicating that the interlayer can alleviate the shuttle of soluble LiPSs. This proposed strategy advances the practical application of Li–S batteries due to the facile and scalable production of the flexible membrane.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Zihua Yu,Shaohua Wu,Chuncheng Li,Yaonan Xiao,Jiajian Liu,Bo Zhang
The poor processability has long limited the broad application of polybenzoxazoles in microelectronics. Herein, a series of poly(benzoxazole imide) (PBOI) copolymers were designed and prepared through the polymerization of 5-amino-2-(4-aminobenzene) benzoxazole with 3,3′,4,4′-biphenyl tetracarboxylic dianhydride and 4,4′-(hexafluoro-isopropylidene)diphthalic anhydride. These PBOI copolymers show excellent film-forming properties by integrating preformed benzoxazole structures into the polyimide backbone. Moreover, the molecular and aggregate structures of PBOIs, such as chain rigidity and stacking behavior, can be facilely regulated by controlling the comonomer ratio, thereby significantly affecting their macroscopic properties. A breakthrough in film performance could be further achieved by compounding PBOIs with fluorinated graphene (FG) via in situ polymerization. This series of FG/PBOI composite films exhibit high mechanical strength (119.8–371.2 MPa), modulus (2.5–6.7 GPa), heat resistance (5% weight loss, 551.3–620.6 °C), and hydrophobicity (water absorption within 72 h, 0.8–2.5%) as well as a low dielectric constant (2.09–3.4), which can well meet the development needs of microelectronic packaging. This work is also believed to provide theoretical guidance for the structural design and performance research of high-performance dielectrics.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Jiabao Gu,Chaogang Ban,Jiazhi Meng,Qianwen Li,Xuanyu Long,Xiaohan Zhou,Nan Liu,Zequan Li
Rapid recombination of the photogenerated carrier, a limited range of photoexcitation, and unsatisfactory photocatalytic activity are the limiting factors in photocatalytic applications. Accelerating photogenerated carrier transfer and constructing surface active sites have become critical tasks. In this study, a dual Z-scheme UNiMOF/BiVO 4 /S-C 3 N 4 (NBSCN) photocatalyst with a 2D/3D/2D structure was successfully constructed. Under visible-light irradiation, NBSCN outperforms single and binary composites in photocatalytic tetracycline photodegradation and Cr(VI) photoreduction due to the synergistic effect of adsorption and photocatalysis. The maximum photocatalytic efficiency of tetracycline (90.1 %) and Cr(VI) (93.6 %) in 120 min was achieved by NBSCN-20 %. The exceptional photocatalytic activity of NBSCN-20 % can be attributed to the large specific surface area, increased active sites, improved visible-light absorption ranges, and the construction of heterojunctions. The fabricated dual Z-scheme heterojunction at the interface of NBSCN reduces the recombination rate of photogenerated carriers and widens the range of light absorption. NBSCN-20 % exhibits excellent stability in the process of cyclic experiments. On the basis of the results, the feasibility of the dual Z-scheme mechanism is proposed. This work demonstrates that NBSCN-20 % photocatalyst has promising application prospects in removing heavy-metal ions and organic pollutants from aqueous environments.
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高影响因子
CARBON
·
2022
·
IF 11.307
Min Yuan,Zeping Wang,Yifan Rao,Ying Wang,Bo Gao,Jiabing Yu,Hui Li,Xianping Chen
Carbon materials with multiple heteroatoms co-doping and hierarchically porous structures have attracted great attention as promising electrode-active materials for supercapacitors. In this paper, an efficient, green, and low-cost strategy is reported to produce O/N/S co-doped hierarchically porous graphene, using laser direct writing on carboxymethyl chitosan (CMCS)/sodium lignosulphonate (SLS) reinforced wood. The resultant materials possess a typical three-dimensional (3D) framework composed of interconnected micro-, meso- and macropores, a large specific surface area, together with rich heteroatoms doping (13.72 wt% for O, 2.06 wt% for N, and 1.68 wt% for S). These superior features have afforded the as-fabricated microsupercapacitor (MSC) with an excellent areal capacitance of 82.1 mF cm −2 at 0.1 mA cm −2 and correspondingly high energy density of 7.3 μWh cm −2 . Moreover, the MSC has good cycling stability (retaining 84.3% of capacitance after 10000 cycles) and favorable modular integration capabilities. Accordingly, this facile preparation of multiple heteroatoms-doped porous graphenes from various renewable and eco-friendly biomass precursors offers promising prospects for low-cost mass production of graphene-based sustainable high-performance electrochemical energy storage.
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高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 6
·1775-1785
·
IF 7
Chuyue Cai,Liping Wu,Zhiwei Cai,Fang Yu,Liu Zhang,Liya Wang,Tao Mei,Liangyou Lin,Xianbao Wang
Lithium–sulfur batteries (LSBs) are broadly considered to be the most promising next-generation energy storage because of their ultrahigh theoretical energy density and cost-effectiveness. However, the “shuttle effect” and sluggish conversion kinetics of polysulfides severely hinder their practical application. To address these challenges, a unique Co-doped MnO2 nanorod network layer with oxygen vacancies (Co-MnOx) was devised by self-assembly on a commercial separator through the chemical growth method for high-performance LSBs. The Co-MnOx modified separators (Co-MnOx@PP) not only effectively alleviate the “shuttle effects” but also accelerate the redox conversion of polysulfides. More importantly, the Co-MnOx@PP demonstrated superior thermostability and flame-retardant properties owing to the chemical growth method. The LSBs with Co-MnOx@PP separators exhibited a high reversible capacity of 902.0 mA h g−1 and 562.2 mA h g−1 at 0.5 C for 20 °C and 60 °C after 200 cycles, respectively. Even at 3 C, after 500 cycles, a superb cycling performance of 715.2 mA h g−1 with an ultra-low decay of 0.069% for each cycle was achieved. Therefore, this proposed strategy of a Co-doped MnO2 nanorod network layer with oxygen vacancies will provide a new route for rationally devising durable and efficient LSBs.
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高影响因子
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