FUEL
·
2022
·
IF 8.035
Xu Li,Long Yan,Ziyue Liu,Yuhe Liao,Longlong Ma
Catalytic hydrodeoxygenation (HDO) of oxygenated compounds is essential for chemical refining, which is always carried out under high temperature, hydrogen pressure or/and strong acids. Herein, we developed a novel Pt/TiO 2 (B) catalyst for the ambient HDO process. With the modified organic functional TiO 2 (B) nanosheets, the catalytic activity of Pt/TiO 2 (B) was significantly improved. Through the synergistic effect of highly dispersed Pt species and TiO 2 (B) supports, phenol was efficiently converted into cyclohexane and concomitant cyclohexanol under 50 °C and atmospheric hydrogen without extra acid. The characterizations of catalysts showed that the introduction of organic functional groups not only led to the formation of highly dispersed Pt species, but was also conducive to the yielding of key HDO intermediates. Due to the low C O bond energy of enol intermediates, the HDO of phenol could be carried out at mild conditions through the implementable C O bond cleavage of enol intermediates. This study provides a new understanding of the green HDO process and a novel approach for HDO catalyst development.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 41
·期 6
·897-904
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IF 3.815
Xu Xiang-Yun,Gao Yu-Tong,Wang Ying-Ying,Zhou You-Shuang,Xiong Bi-Jin,Zhu Jin-Tao
Miscible disordered block copolymers (BCPs) are rarely studied due to the limits in self-assembly into ordered microstructures. Herein, we proposed a facile method for the transformation of disordered miscible BCPs to comb-like BCPs with well-ordered microphase separation structures via blending with amphiphilic surfactants. In this work, poly(4-vinyl pyridine- b -hydroxybutylacrylate) (P4VP- b -P4HBA) was applied as a model of miscible disordered BCPs and the microphase separation was induced via blending with surfactants of dodecylbenzene sulfonic acid (DBSA) and 3-pentadecylphenol (PDP). The ordered microstructures including spherical and cylindrical morphologies were confirmed by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS) investigation. These ordered microstructures thermal sensitive, in which ordered and disordered transformation (ODT) was observed in the blend of P4VP-b-P4HBA and PDP whereas it disappeared in the blend of P4VP- b -P4HBA and DBSA. The results show that the thermal stability of the ordered microstructures are strongly depends on the interactions between the miscible BCPs and surfactants, which investigated by in situ SAXS and Fourier transform infrared spectrometer (FTIR). The combination of miscible BCPs and surfactant creates a feasible strategy to fabricate ordered nanostructures, which could be employed to develop complicated nanomaterials.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2019
·Vol. 46
·期 1
·509-520
·
IF 2.064
Tang Chang-cun,Fang Yan-fen,Cao Xin-qiang,Tian Hai-lin,Huang Ying-ping
In this paper, bismuth oxybromide (BiOBr) photocatalysts were synthesized in the presence of tetrabutylammonium bromide (TBAB) at the different volume fractions of ethanol/water and named as BiOBr 0 , BiOBr 20 , BiOBr 50 , BiOBr 80 and BiOBr 100 , respectively. The samples were characterized and applied to the degradation of Rhodamine B (RhB) under visible-light irradiation ( λ ≥ 420 nm). The results indicated that both TBAB and ethanol significantly affected the crystal phase, morphology and surface charge distribution of BiOBr. The exposed (110) faces of BiOBr with Bi 3+ sites contributed to its photocatalytic activity via the enhanced separation of electrons and photogenerated holes as well as the better photo-stability. BiOBr 50 showed the optimal activity for the photodegradation of RhB. Superoxide radical (O ·− 2 ) as the dominant active species was responsible for the degradation of RhB.
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-8
·
IF 4.011
Lv Weifeng,Yang Can,Meng Ge,Zhao Ruifeng,Han Aijuan,Wang Rong,Liu Junfeng
Vanadium oxide has attracted extensive attention for electrochemical capacitors due to its wide range of versatility. However, due to the relative poor conductivity and chemical stability of vanadium oxide, severe losses of capacitance often occur during charge and discharge processes. Herein, a free-standing vanadium dioxide (VO 2 (B)) nanobelts/reduced graphene oxide (VO 2 /rGO) composite film was fabricated by assembly of VO 2 (B) nanobelts and rGO for supercapacitors. The flexible rGO sheets and VO 2 (B) nanobelts intertwined together to form a porous framework, which delivered a 353 F g −1 specific capacitance at 1 A g −1 , and after 500 cycles, the specific capacitance retention rate was 80% due to the enhanced conductivity of the VO 2 (B) nanobelts by rGO and increased transport of ions and electrons by the porous structures. An all-solid-state symmetrical supercapacitor was assembled from the VO 2 /rGO composites, which exhibited good energy storage performance with a maximum voltage of 1.6 V. The maximum power density is 7152 W kg −1 at the energy density of 3.13 W h kg −1 , ranking as one of the highest power densities for reported materials. In addition, after 10000 cycles, it still has a specific capacitance retention rate of 78% at 10 A g −1 .
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ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Xinlu Li,Yin Liu,Xinlin Zhang,Cong Yao,Ronghua Wang,Chaohe Xu,Juan Lei
A porous spherical hybrid of TiO 2 (B)/anatase entwined by graphene nanoribbons (GNRs) was synthesized by a facile and scalable method. The entwining of GNRs can adhere on the surface of TiO 2 by electrostatic interactions and prevent TiO 2 nanoribbons from self-scrolling to nanotubes , facilitating large lithium storage and high rate capability. The TiO 2 /GNRs nanocomposite exhibited high rate capability in galvanostatic charge-discharge experiments, providing a capacity of 131 mAh g −1 with a coulombic efficiency of 99.2% at a charge rate of 10C (1 C = 335 mA g −1 ) over 1400 cycles. The appealing electrochemical performance can be attributed to the synergistic effect of TiO 2 nanoribbons entwined by GNRs.
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DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY
·
2019
·
IF 3.119
Liting Wu,Enxu Zhou,Along Gao,Linghe Kong,Siwei Wu,Xia Bian,Yuan Li,Bingxi Li,Shengli Fu,Zheng Guo,Jianmin Ye
B lymphocyte-induced maturation protein 1 (Blimp-1), a transcription factor containing zinc finger , is required and sufficient to trigger terminal differentiation of B cells in mammals. The Blimp-1 ( OnBlimp-1 ) from Nile tilapia ( Oreochromis niloticus ) was identified and characterized its expression pattern during B cell activation and maturation. The cDNA of OnBlimp-1 open reading frame is 2547 bp encoding a protein of 848 amino acids and the predicted molecular weight is 93.36 kDa. OnBlimp-1 contains a SET domain and five ZnF_C2H2 domains, which shares high homology with that of other species. OnBlimp-1 transcription was detected in all examined tissues with high expression in the spleen (SPL). Analysis of sorted lymphocyte populations , including IgM + and IgM − cells from peripheral blood (PBL), SPL and anterior kidney (AK), indicated that the OnBlimp-1 transcription was highly expressed in the IgM + B cells. Upon LPS stimulation, OnBlimp-1 expression was up-regulated in tissues of PBL, SPL and AK significantly. The expression of OnBlimp-1 , as well as the secreted IgM , was significantly up-regulated in the SPL and AK leukocytes stimulated with anti-OnIgM monoclonal antibody and LPS in vitro , respectively. Above results suggest that OnBlimp-1, a cytokine regulating the terminal differentiation of activated B cells to antibody-secreting cells, is likely to play important roles in B cell activation and maturation in Nile tilapia.
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Journal of Chemistry
·
2019
·
IF 1.727
Song-qi Hu,Yin Wang,Lin-lin Liu
Hexagonal boron nitride (h-BN) powders were fabricated by the combustion synthesis with B/KNO3/HMX (octogen) mixtures as reactants. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were adopted to investigate the phase composition and the chemical composition of the products, respectively. The morphology and resistance to oxidation were studied by scanning electron microscopy (SEM) and thermogravimetry (TGA), respectively. The characterization results showed that the h-BN which was produced through this method has high purity and exhibits excellent resistance to oxidation. The purity of h-BN is improved with the increasing content of HMX in reactants with boron carbide (B4C) and boron oxide (B2O3) as main impurity, but conversely, the yields are obviously decreased. Taking the comprehensive consideration of the purity and the yields together, the optimal molar ratio of B/KNO3/HMX is 10 : 1 : 4. In addition, the experimental results indicated that the crystalline grain size grows with the increasing content of HMX. The method explored in this study does not need expensive processing facilities and equipment, which is a preferable approach for the laboratory to prepare h-BN of high purity.
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TALANTA
·
2019
·
IF 4.916
Yue Du,Yonghai Song,Juan Hao,Keying Cai,Nan Liu,Li Yang,Li Wang
A novel ratiometric fluorescent sensor for superoxide radical (O 2 •− ) detection was developed based on Schiff base polymer (SBP)/rhodamine-B (SBP/RDB) nanocomposites. The SBP/RDB was investigated by atomic force microscopy , scanning electron microscopy, transmission electron microscopy , X-ray powder diffraction, Fourier transform infrared spectroscopy, N 2 adsorption/desorption isotherms and fluorescence spectroscopy, etc. The results showed the SBP was two-dimensional (2D) crystalline nanosheet with the thickness of 0.5 nm. RDB could be self-assembled on each of 2D SBP surface to form SBP/RDB due to the hydrogen bond between N atoms of SBP and –COOH of RDB as well as π-π interaction. The SBP/RDB exhibited the characteristic fluorescence emission of both SBP at 485 nm and RDB at 585 nm under an excitation of 270 nm. The 2D SBP was not only acted as template to assemble RDB, but also used as reference fluorescence for O 2 •− detection. The SBP/RDB fluorescence probe for O 2 •− detection demonstrated high sensitivity and selectivity with good linear range (11.1 ± 0.76 nM–8.0 ± 0.36 μM) and low detection limit (3.7 ± 0.42 nM). Because of the low cost and simple operation, the work sheds some new light to construct ratiometric fluorescent sensors based on SBP to detect O 2 •− in drinking water and human blood serum for commercial applications.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Yao Feng,Shuyi Lai,Le Yang,Ralf Riedel,Zhaoju Yu
Polymer-derived porous Bi 2 WO 6 /SiC(O) nanocomposites were prepared by a simple mechanical mixing of Bi 2 WO 6 nanopowders with a polyorganocarbosilane, namely allylhydridopolycarbosilane (AHPCS), followed by pyrolysis of the resulting blend at 700 °C for 2 h. The Bi 2 WO 6 nanopowders were synthesized by the reaction between Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 and characterized by means of X-ray diffraction (XRD) and dynamic light scattering (DLS). The cross-linking and polymer-to-ceramic transformation of the physically blended Bi 2 WO 6 /AHPCS were determined by Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA). TEM studies revealed that the final ceramic composite is comprised of Bi 2 WO 6 nanoparticles homogeneously embedded in a polymer-derived SiC(O) matrix. Nitrogen sorption isothermal analysis showed the meso-macroporous feature of resultant Bi 2 WO 6 /SiC(O) nanocomposites. Finally, the porous Bi 2 WO 6 /SiC(O) composites show a high photodegradation efficiency (ca. 90%) towards a model organic dye Rhodamine B (RhB) under UV irradiation. Therefore, the synthesized ceramic composite has to be considered as a promising candidate material for purification of water contaminated with organic dyes.
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Oncology Letters
·
2018
·Vol. 15
·期 5
·7806-7816
·
IF 1.664
Qingling Hua,Lin Wang,Chan Liu,Lingling Han,Yazhong Zhang,Hu Liu
To date, there have been a limited number of useful biomarkers for the screening and monitoring of B‑cell non‑Hodgkin's lymphoma (B‑NHL), which leads to the impetus to discover novel biomarkers for the disease. In the present study, gas chromatography‑mass spectrometry (GC‑MS) combined with head‑space solid‑phase micro‑extraction (HS‑SPME) was employed to analyze the volatile metabolites in the urine samples of 131 subjects. The subjects were divided into 4 main groups: Aggressive B‑NHL, indolent B‑NHL, benign lymphatic diseases patients and healthy volunteers. The differences of the concentrations of the potential biomarkers among the groups were assessed by non‑parametric Wilcoxon's test. The ability of the potential biomarkers to discriminate between the four aforementioned groups was evaluated by receiver operating characteristic curves (ROC). The present study indicated that 4‑heptanone, 2‑methylpyrazine, 2‑methylbutanal, 2,6‑dimethyl‑7‑octen‑2‑ol and decanoic acid may serve as potential biomarkers for B‑NHL. The area under the curve (AUC) values of single potential biomarker ranged from 0.634 to 0.901. The diagnostic models established with combined biomarkers exhibited higher diagnostic values (AUC, 0.824‑0.968) compared with the models established with single biomarkers. The present study indicated that urinary volatile metabolites might be potential biomarkers for screening and monitoring of B‑NHL.
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CHIRALITY
·
2018
·Vol. 30
·期 11
·1173-1181
·
IF 1.833
Jidong Yang,Xuanping Tan,Yanmei Zhao
A novel and simple method for simultaneous determination of chiral carnitine (CA) enantiomers was proposed. In this work, the rhodamine B (RhB) could react with D-CA and L-CA, and new resonance Rayleigh scattering (RRS) peaks were generated. According to the polarization experiments, it could be testified that scattering peak of this system was composed of resonance fluorescence and scattering light. The RRS intensity of the RhB could be enhanced with the addition of D- or L-CA. However, The RRS signal with L-CA had greater degree increased. So a useful assay program for the selective and simultaneous determination of CA enantiomers was built via the RRS signal differences of the two CA enantiomers responding to RhB. The results showing a good linear relationship and high correlation coefficient were obtained, and the detection limit was calculated as 0.086 μg·mL −1 (D-CA) and 0.042 μg·mL −1 (CA). Here, new built RRS method with RhB as chiral probe could be applied to achieve selective analysis through this work. The applicability of the chiral recognition of CA enantiomers mixtures in samples had been demonstrated by its low cost, sensitivity, enantioselectivity, simplicity, and good availability of the materials.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Jie Guo,Yongjiang Hou,Bo Li,Yulei Liu
Ni–Co–B hollow nanospheres were synthesized by the galvanic replacement reaction using a Co–B amorphous alloy and a NiCl 2 solution as the template and additional reagent, respectively. The Ni–Co–B hollow nanospheres that were synthesized in 60 min (Ni–Co–B-60) showed the best catalytic activity at 303 K, with a hydrogen production rate of 6400 mL hydrogen min −1 g catalyst −1 and activation energy of 33.1 kJ/mol for the NaBH 4 hydrolysis reaction . The high catalytic activity was attributed to the high surface area of the hollow structure and the electronic effect. The transfer of an electron from B to Co resulted in higher electron density at Co sites. It was also found that Ni was dispersed on the Co–B alloy surface as result of the galvanic replacement reaction. This, in turn, facilitated an efficient hydrolysis reaction to enhance the hydrogen production rate. The parameters that influenced the hydrolysis of NaBH 4 over Ni–Co–B hollow nanospheres (e.g., NaOH concentration, reaction temperature, and catalyst loading) were investigated. The reusability test results show that the catalyst is active, even after the fifth run. Thus, the Ni–Co–B hollow nanospheres are a practical material for the generation of hydrogen from chemical hydrides .
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