ENERGY & FUELS
·
2022
·
IF 4.654
Xiaohan Wang,Zhiqing Yu,Jinxiao Sun,Qiang Wei,Haoran Liu,Wenbin Huang,Luyuan Zhao,Meng Si,Yasong Zhou
A series of in situ dodecyl trimethyl ammonium bromide (DTAB)-modified small-crystal Y zeolites have been successfully synthesized by DTAB addition to the seed synthesis procedure, which was used to create the small crystal size Y zeolites. Compared to the Y zeolites prepared without DTAB, the Y zeolites prepared with DTAB have a uniform morphology and mesoporous structure, a larger specific surface area (up to 32.3 m2 g–1 increase), a smaller crystal size (up to 66 nm reduction), and more Brönsted acid sites (up to 55 μmol/g increase). After loading with NiW, the corresponding NiW catalysts were utilized in the hydrocracking of n-hexadecane. It is evident from the catalytic performance that the catalysts containing DTAB-modified small-crystal zeolites have a higher yield and selectivity of primary cracking products compared with the Y zeolites without DTAB modification. Moreover, the conversion of n-hexadecane is also higher due to its low mass-transfer resistance, high dispersion, and sulfation of W species. When the molar ratio of DTAB/Al2O3 is 0.15, the corresponding catalyst has the optimum balance between cracking and hydro–dehydrogenation activity. Therefore, it has the most excellent catalytic performance and a 7.3% increase in C8–C12 yield.
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2015
·
IF 1.599
Guangqing Zhuang,Wei Ping,Yun Zhang,Yanrong Jia,Lan Zhou,Qinguo Fan,Jianzhong Shao
Structural coloration is a kind of biomimetic coloring technology. (Silica/polyethyleneimine)n (SiO2/PEI)n films with structural color on the surface of silk fabrics were fabricated by the electrostatic self-assembly method. The structural color of silk fabrics with (SiO2/PEI)n films was captured by a digital camera, and the reflectance spectra were measured by the DigiEye system and a multi-angle spectrophotometer. The morphological structure of (SiO2/PEI)n films on silk fabrics was observed by a field emission scanning electron microscope. The coloring mechanism of the silk fabrics is in agreement with single thin film interference theory, and the variability of the structural color on the silk fabrics is similar to those on polyester fabrics varying with the assembly cycles, particle sizes and viewing angles. However, the color brilliance, brightness and iridescence effect of the silk fabrics are inferior to those of polyester fabrics with the same films, due mainly to the differences in fiber surface structure and microstructure between silk fibers and polyester fibers.
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DOI
高影响因子
GREEN CHEMISTRY
·
2018
·Vol. 20
·期 10
·2320-2327
·
IF 8.586
Alei Zhang,Guoguang Wei,Xiaofang Mo,Ning Zhou,Kequan Chen,Pingkai Ouyang
In this study, we propose a novel biological fermentation method to process chitin powder utilizing the bacteria Chitinolyticbacter meiyuanensis SYBC-H1. The chitin obtained from this process is called CBF, and it was further investigated for N-acetyl-D-glucosamine (GlcNAc) enzymatic production. This fermentative treatment caused chitin powder to acquire a visible fleecy structure, and scanning electron microscopy showed that the surface of the CBF was a fiber-like structure with a diameter ranging from 10 nm to 200 nm. Moreover, Fourier transform infrared spectrometry, X-ray diffraction and gel permeation chromatography revealed that the crystallinity and average molecular weight of the chitin clearly decreased in the absence of deacetylation following bacterial fermentation treatment. The optimal conditions for bacterial treatment of chitin were determined at 25 °C, 200 rpm, and an initial pH of 7.5 for 12 h. Additionally, 19.2 g L−1 of GlcNAc could be obtained with a yield of 96% from 20 g L−1 of CBF in a batch enzymatic reaction within 6 h. This new approach provided an environmentally friendly and mild method for reducing the crystallinity of chitin and enhancing GlcNAc conversion without the use of oxidants, acids, or other environment unfriendly reagents.
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DOI
高影响因子
Journal of Materials Chemistry B
·
2021
·Vol. 10
·期 5
·717-727
·
IF 6.331
Zhiyu Li,Yichun Gao,Huinan Zhang,Fang Lan,Yao Wu
Alterations in plasma membrane glycoproteins (PMGs) have been identified as a hallmark of cancer. The comparison and identification of differential PMGs is significant for finding new markers and understanding pathological processes. However, the research on PMGs is often constrained by the low abundance and the disturbance of abundant endogenous biomolecules during direct analysis. Here, we report a bottom-up strategy to enrich the PMGs of breast cancer cells using hydrophilic magnetic covalent triazine frameworks (CTFs). A total of 972 N-glycopeptides and 1006 N-glycosites belonging to 526 N-glycoproteins were enriched in MCF-10A plasma membrane tryptic digest by magnetic CTFs. And 680 N-glycopeptides and 806 N-glycosites belonging to 443 N-glycoproteins were enriched in SK-BR-3 plasma membrane tryptic digest. Furthermore, comparative analysis was performed based on gene ontology to verify breast cancer biomarkers (SUSD2 and ALCAM) and differential PMGs’ function. This strategy which systematically integrates efficient enrichment of differential PMGs and in-depth comparative analysis has great potential for helping illuminate the atlas of breast cancer PMGs and the causes of tumor metastasis.
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DOI
PubMed
高影响因子
Materials Chemistry Frontiers
·
2021
·Vol. 6
·期 4
·491-502
·
IF 6.482
Maiyong Zhu,Chengyu Tu,Xuan Li,Qiao Luo,Songjun Li
Searching electrodes with high specific capacitance, rate capability, long cycling life and economic efficiency is central for next-generation supercapacitors. In this work, a hybrid electrode consisting of MnO and N-doped carbon (MnO–NC) was constructed using KMnO4 and carboxymethyl chitosan as manganese sources and carbon sources respectively. The effect of the ratio of KMnO4 to carboxymethyl chitosan on the structure and electrochemical performance of MnO–NC was investigated in detail. At the optimized condition, a high specific capacitance of 326.36 F g−1 was obtained with satisfied cyclic stability. Moreover, an asymmetric supercapacitor (ASC) device (MnO–NC//AC), consisting of MnO–NC as the positive electrode and activated carbon (AC) as the negative electrode was assemble, which exhibited a specific energy density was 9.35 W h kg−1 at a power density of 374.83 W kg−1. Owing to the long activation process, the capacitance of the ASC device remains 172% after 10 000 cycles. These results indicate that the prepared MnO–NC has great prospects for the application of high-performance supercapacitors.
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DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2020
·Vol. 62
·期 4
·368-374
·
IF 0.976
Qian Zhao,Zhan Yi-Kai,Liu Yu-Fei,He Min,Gong Yong-Ji
Abstract Poly( N -(3-carboxyphenyl)maleimide- alt -styrene) with superior heat-resistance was synthesized by free radical copolymerization and its structure was confirmed by FTIR and NMR spectroscopy. To show the advantages in heat-resistance of the synthesized copolymers, the thermal properties of poly( N -phenylmaleimide- alt -styrene) and poly( N -phenylmaleimide- alt -maleic anhydride) with similar structures were determined. DSC/TG analysis showed that the synthesized copolymer exhibited the better thermal properties than two other copolymers due to the formation of a chemically crosslinked three-dimensional network during heating.
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高影响因子
Materials Advances
·
2021
·Vol. 2
·期 12
·3971-3980
·
IF 0
Shuai Wang,Zheng Lu,Yuan Fang,Tian Zheng,Zidong Zhang,Wenjian Wang,Rui Zhao,Weidong Xue
Rational construction of self-supporting electrodes has been extensively investigated in energy conversion and storage. In this work, hierarchical N-doped carbon-encapsulated Ni3S2 grown on a 3D porous Ni foam (H-Ni3S2@NC/NF) was controllably synthesized by a one-pot self-templated solvothermal method. Herein, we highlight the self-templated growth of multilayered Ni3S2 with N-doped carbon intercalation at a certain temperature. The unique H-Ni3S2@NC/NF shows enhanced active sites and a modulated electronic structure, which facilitates mass/electron transport. Thereby, the H-Ni3S2@NC outperforms a lower overpotential of 238 mV at 10 mA cm−2 and a low Tafel slope of 62 mV dec−1 than that of binary and ternary metal sulfides, suggesting an excellent mono-metal sulfide as a self-supporting electrode for oxygen evolution reaction.
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DOI
Molecular Catalysis
·
2021
·
IF 5.062
Guoqin Wang,Gangli Zhu,Yong Ding,Chungu Xia,Zhen Li
Polyoxymethylene dialkyl ethers, which can be blended into diesel fuels, have attracted increasing attentions due to their advantages for fuel additives. It can utilize bioethanol and biomass syngas, helping to achieve the carbon neutral target earlier. Polyoxymethylene diethyl ethers (PODEE n ) synthesis requires efficient catalysts with high performance. In this work, the mesoporous acidic functional N-containing ZrN x O y catalysts were prepared with a Sol-Gel assisted solvothermal method. The acid nature and strength, morphology, crystalline structure and pore distribution of catalysts were characterized by fourier transform infrared (FT-IR) spectroscopy, pyridine-adsorption infrared spectra (Py-IR), scanning electron microscopy (SEM), Transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), N 2 adsorption-desorption isotherm, X-ray photoelectron spectroscopy (XPS), temperature-programmed desorption of ammonia (NH 3 -TPD) etc, showing catalyst possessing crystalline-amorphous mixed domains with smaller defective tetragonal nanoparticles and mesopores . The catalysts were applied in PODEE n synthesis, showing excellent activity and selectivity under mild conditions. And the high trioxane (TOX) conversion of 93 % and excellent PODEE 2−8 selectivity of 98 % can be achieved at 80 °C under atmospheric pressure owning to the superior properties.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Jia-Qi Zheng,Jian Chen,Ming Zhu,Wen-Hui Chen,Ning-Ning Ma,Xiu-Min Yao,Zheng-Ren Huang
N-doped SiC-MoSi 2 ceramics were successfully fabricated by hot pressing in N 2 using Y(NO 3 ) 3 .6 H 2 O as both sintering aids and additional N sources. The impact of Y(NO 3 ) 3 .6 H 2 O content on the densification, electrical properties, and infrared emission performance of the resulting ceramics were investigated. The distribution of Y-based sintering aid is improved by melting of Y(NO 3 ) 3 .6 H 2 O during slurry drying, enabling the relative density to increase up to 97.4%. Y(NO 3 ) 3 .6 H 2 O subsequently decomposes during sintering and allows the substitution of atomic N for the C sites in SiC lattice and production of the N-derived donor level. A larger amount of N dopant elevates the carrier density up to 1.90 × 10 16 cm -3 . Remarkably, The SiC − 10 wt% MoSi 2 ceramics sintered with 16.9 wt% Y(NO 3 ) 3 .6 H 2 O exhibits the lowest electrical resistivity (0.791 Ω·cm at room temperature) and highest infrared emissivity (0.913 at 800 ℃), the latter of which may also be attributed to lattice distortion induced by N doping . This work demonstrates N doping as a prospective strategy for synergistically optimizing the electrical conduction and infrared emission performance of SiC-based ceramics for infrared source applications.
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高影响因子
ChemElectroChem
·
2022
·Vol. 9
·期 22
·e202200715
·
IF 4.782
Wei-Xiang Cheng,Yi-Zhao Chen,Song-Yi Liao,Jun-Qi Hu,Cun-Sheng Liu,Shuai-Fu Cui,Xing-Wen Huang,Yidong Liu,Yonggang Min
Graphical NIB news : MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating were prepared and applied in Na-ion batteries (NIBs). It remained at ∼308 mAh g −1 at 0.5 A g −1 after 300 cycles and showed higher rate performance of ∼189 mAh g −1 at 4 A g −1 . The MoS 2 @N-MXene/C heterogeneous nanosheets showed enhanced pseudocapacitance effects of 84.5 % at a scan rate of 2 mV s −1 according to CV curves simulation. Currently, Na-ion batteries (NIBs) have emerged as a new generation of energy storage devices. However, due to the lack of suitable anode materials, the large-scale practical application of NIBs is still greatly limited. Therefore, to address this issue, an effective strategy towards an advanced NIBs anode was developed by achieving MoS 2 anchored on nitrogen-doped MXene nanosheets with carbon coating (shorten as MoS 2 @N-MXene/C). The structure, surface chemistry state and micromorphology of MoS 2 @N-MXene/C were carefully analyzed and characterized by XRD, XPS and SEM/TEM, respectively. It was shown that MoS 2 was loaded on N-MXene to form a heterogeneous nanosheets structure. When applied to the anode of NIBs, MoS 2 @N-MXene/C delivered ∼189 mAh g −1 at 4 A g −1 and remained at ∼308 mAh g −1 after 300 cycles at 0.5 A g −1 . Moreover, based on the simulation and calculation from CV curves, the enhanced electrochemical performances of MoS 2 @N-MXene/C was assigned to its high pseudocapacitance-dominated contribution (84.5 % at a scan rate of 2 mV s −1 ). Therefore, owing to the highly conductive N-MXene and the actively anchored MoS 2 , MoS 2 @N-MXene/C could effectively provide efficient channels for charge transfer and ionic diffusion. The presented design strategy may provide a guidance for developing more-efficient NIBs anode.
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高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Ziyan Du,Jingxi Qin,Kang Zhang,Linwei Jia,Ke Tian,Junfeng Zhang,Haijiao Xie
Single atom catalysts with high-catalytic activity have been applied in many fields. In this work, single Fe atoms (FeSA) showed excellent catalytic performance on P-nitrophenol (PNP) degradation with high total organic carbon (TOC) removal rate and high turnover frequency (TOF). The high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) results show that Fe species in FeSA are mainly single Fe atom. X-ray absorption near-edge structure (XANES) and density functional theory (DFT) calculations show that each single Fe atom is anchored by four N atoms in the form of FeN 4 active site. This coordination environment enables FeSA possesses unique geometric configuration and highly uniform active sites, which is conducive to organic pollutant adsorption and peroxymonosulfate (PMS) activation. In addition, FeSA could maintained excellent catalytic activity in complex water bodies containing different anions and humic acids. The active species in the FeSA/PMS system were also investigated. It is found that the main oxidative active species in the system are O 2 •− and 1 O 2 . This work shows that FeSA was a highly efficient single atom catalyst for the degradation of organic pollutants and has a wide application prospect in advanced oxidation processes.
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高影响因子
CARBOHYDRATE POLYMERS
·
2021
·
IF 9.381
Tao Liu,Shaohua Gou,Yang He,Shenwen Fang,Lihua Zhou,Guangjun Gou,Lang Liu
In this paper, N -methylene phosphonic acid chitosan (NPCS-PEI) was synthesized from chitosan, phosphorous acid , formaldehyde and hyperbranched polyethyleneimine (PEI), and Cu 2+ and Pb 2+ removal performance was examined in aqueous solution. NPCS-PEI exhibited three-dimensional porous architectures, with a specific surface area of 490.61 m 2 /g. The effects of pH, initial concentration, adsorption time, temperature and ionic strength on the adsorption capacity were investigated. The adsorption kinetics indicated that Cu 2+ and Pb 2+ adsorption onto NPCS-PEI follows a pseudo-second-order model. The adsorption isotherms agree well with the Langmuir isotherm model, and the maximum adsorption capacities of Cu 2+ and Pb 2+ on the NPCS-PEI are approximately 276.12 and 645.16 mg/g, respectively. The adsorption efficiency of NPCS-PEI remained above 85% after 5 adsorption-desorption successive cycles. Moreover, the NPCS-PEI aerogels had selective adsorption toward Cu 2+ . The FTIR and XPS analysis proved that amino, hydroxyl, and phosphonic acid groups were involved in the chelation with metal ions .
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）