CELLULOSE
·
2018
·Vol. 25
·期 11
·6745-6758
·
IF 3.809
Liu Xiao-hui,Zhang Yan-guang,Cheng Bo-wen,Ren Yuan-lin,Zhang Qiu-yan,Ding Chen,Peng Bo
Abstract Cellulosic fibers are usually finished with flame retardant via repeated pad-dry-cure processes. The present contribution reports a simple, facile, and one-pot chemical treatment process to access durable flame retardant lyocell fibers by directly immersing the fibers into the solution of a flame retardant ester of 2,2-ethanolamine diphosphoric acid (EADP) and urea for a certain time without using catalyst and cross-linker. As demonstrated, the treated lyocell fibers with grafted EADP show excellent flame retardancy and durability, as evidenced by an increase of limiting oxygen index value up to 37.8% and still 25.6% after 40 washing cycles. The key to success is ascribed to the formation of three dimensional flame retardant structures with EADP. Various analytical techniques, including raman spectroscopy, scanning electron microscope, thermogravimetry, and TG-infrared coupled technique prove that the carbonaceous residue and non-combustion gases were preferably generated during thermal decomposition process of treated fibers. Microcombustion calorimetry results revealed a significant reduction in the peak of heat release rate. The results indicate that EADP is potential for using as an efficient durable flame retardant of lyocell fibers. Graphical abstract
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高影响因子
CHROMATOGRAPHIA
·
2017
·Vol. 80
·期 12
·1733-1739
·
IF 1.402
Zhang Chaozheng,Zheng Yu,Ma Shenxi,Wu Zhiguo
Abstract Bile acids are essential materials in the fatty acid cycle. Thus, understanding the metabolism of bile acids is significant. In this study, LC–MS was employed to analyze the composition and content of bile acids in rat cecal contents. Six individual bile acids were determined simultaneously. The mobile phase consisted of acetonitrile and 10 mmol L −1 of ammonium acetate solution. The flow rate was 0.2 mL min −1 , and the total analysis time was 34 min. Under the developed conditions, all calibration curves for the six individual bile acids were achieved, and all correlation coefficients exceeded 0.99. Meanwhile, satisfactory results were obtained in the range of 50–500 µg g −1 for the six individual bile acids in the rat cecal contents. The LOD and LOQ of the bile acids were as low as 2.5 and 10 µg g −1 in the rat cecal contents, respectively, and the relative standard deviations of the peak area were within 1.25–2.01%. The dried residues after extraction were selected as the blank matrix. The overall recovery efficiencies of the bile acids in biological samples were increased to 97.2–103.2%. Therefore, the developed method can be used to quantify individual bile acids at extremely low levels in rat cecal contents. Graphical Abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 55
·期 4
·1614-1626
·
IF 3.442
Pan Liuyi,He Yulong,Niu Menglong,Dan Yong,Li Wenhong
Ni 2 P catalysts supported on different supports, such as SiO 2 from different sources, Al 2 O 3 , TiO 2 and ZrO 2 were prepared for the hydrodeoxygenation of p-cresol (monocyclic phenol model in coal tar). The reaction was carried out on a fixed-bed reactor at a temperature of 330–390 °C under 2 MPa. The order of conversion of p-cresol was as follows: Ni 2 P/SiO 2 -2 > Ni 2 P/SiO 2 -3 > Ni 2 P/SiO 2 -1 > Ni 2 P/Al 2 O 3 > Ni 2 P/ZrO 2 > Ni 2 P/TiO 2 . Ni 2 P/SiO 2 -3 shown higher DDO path selectivity, resulting in the conversion of p-cresol of 93% and a selectivity of 72.6% for BTX products under the reaction temperature of 370 °C with LHSV of 0.5 h −1 . This catalyst was also used for the hydrodeoxygenation of the crude phenolic mixture extracted from coal tar, which shown that the phenol deoxidation rate was 87.6% and the BTX product selectivity was 73.7% by GC–MS.
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高影响因子
Frontiers in Energy
·
2021
·Vol. 16
·期 6
·931-942
·
IF 2.709
Sun Jing,Yu Guanqun,An Kui,Wang Wenlong,Wang Biao,Jiang Zhenyu,Sun Chenggong,Mao Yanpeng,Zhao Xiqiang,Song Zhanlong
Diverse interactions between microwaves and irradiated media provide a solid foundation for identifying novel organization pathways for energy flow. In this study, a high-energy-site phenomenon and targeted-energy transition mechanism were identified in a particular microwave heating (MH) process. Intense discharges were observed when microwaves were imposed on irregularly sized SiC particles, producing tremendous heat that was 8-fold the amount generated in the discharge-free case. Energy efficiency was thereby greatly improved in the electricity-microwaves-effective heat transition. Meanwhile, the dispersed microwave field energy concentrated in small sites, where local temperatures could reach 2000°C–4000°C, with the energy density reaching up to 4.0 × 10 5 W/kg. This can be called a high-energy site phenomenon which could induce further processes or reactions enhancement by coupling effects of heat, light, and plasma. The whole process, including microwave energy concentration and intense site-energy release, shapes a targeted-energy transition mechanism that can be optimized in a controlled manner through morphology design. In particular, the discharge intensity, frequency, and high-energy sites were strengthened through the fabrication of sharp nano/microstructures, conferring twice the energy efficiency of untreated metal wires. The microwave-induced high-energy sites and targeted energy transition provide an important pathway for high-efficiency energy deployment and may lead to promising applications.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 9
·1-10
·
IF 6.232
Li Zi-Ling,Zhang Zi-Yang,Zhao Teng-Wen,Meng Chun-Yan,Zhang Qian-Ying,Wang Man-Man
A novel zeolite imidazole framework@hydroxyapatite composite (ZIF-8@HAP) was constructed via in-situ growth and developed for efficient dispersive solid-phase extraction (DSPE) of three benzodiazepines from urine samples. The prepared composite was characterized by scanning electron microscopy, energy-dispersive spectrometer, Fourier-transform infrared spectrometry, X-ray diffractometry, zeta potential analyzer, and nitrogen adsorption-desorption experiment. Characterization results showed typical dodecahedron ZIF-8 crystals that were uniformly located on the surface of rod-like HAP. The combination of ZIF-8 and HAP made the surface area significantly enhanced from 4.68 to 205.44 m 2 g −1 . Compared with a commercial C 18 adsorbent, ZIF-8@HAP exhibited superior removal performance for interfering components from urine and offered better extraction properties for the analytes. The prepared ZIF-8@HAP was applied as an adsorbent in DSPE, and the main experimental parameters, including pH and ionic strength of solution, adsorbent amount, adsorption time, elution solvent, and volume, were investigated. Under optimal conditions, the adsorption for 250 ng mL −1 of each analyte in 4 mL of urine was accomplished within 2 min using 60 mg of adsorbent. The method of ZIF-8@HAP–based DSPE followed by high-performance liquid chromatography gave enhancement factors of 13.3–15.3, linear ranges of 2.5–500 ng mL −1 , and limits of detection ( S/N = 3) of 0.7–1.4 ng mL −1 . The relative recoveries at three spiked levels ranged from 88.7 - 102% with intra-day and inter-day precisions from 3.0 - 10.3% and 2.3 - 12.3%, respectively. These results indicated that the proposed strategy had promising applicability for convenient, rapid, and efficient determination of benzodiazepines in urine samples. Graphical abstract In-situ fabrication of ZIF-8@HAP composite for dispersive solid-phase extraction of benzodiazepines in urine samples.
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PubMed
高影响因子
Microbiome
·
2017
·Vol. 5
·期 1
·1-18
·
IF 8.496
Hill Cian J.,Lynch Denise B.,Murphy Kiera,Ulaszewska Marynka,Jeffery Ian B.,O’Shea Carol Anne,Watkins Claire,Dempsey Eugene,Mattivi Fulvio,Tuohy Kieran,Ross R. Paul,Ryan C. Anthony,O’ Toole Paul W.,Stanton Catherine
Background The gut is the most extensively studied niche of the human microbiome. The aim of this study was to characterise the initial gut microbiota development of a cohort of breastfed infants ( n = 192) from 1 to 24 weeks of age. Methods V4-V5 region 16S rRNA amplicon Illumina sequencing and, in parallel, bacteriological culture. The metabolomic profile of infant urine at 4 weeks of age was also examined by LC-MS. Results Full-term (FT), spontaneous vaginally delivered (SVD) infants’ microbiota remained stable at both phylum and genus levels during the 24-week period examined. FT Caesarean section (CS) infants displayed an increased faecal abundance of Firmicutes ( p < 0.01) and lower abundance of Actinobacteria ( p < 0.001) after the first week of life compared to FT-SVD infants. FT-CS infants gradually progressed to harbouring a microbiota closely resembling FT-SVD (which remained stable) by week 8 of life, which was maintained at week 24. The gut microbiota of preterm (PT) infants displayed a significantly greater abundance of Proteobacteria compared to FT infants ( p < 0.001) at week 1. Metabolomic analysis of urine at week 4 indicated PT-CS infants have a functionally different metabolite profile than FT (both CS and SVD) infants. Co-inertia analysis showed co-variation between the urine metabolome and the faecal microbiota of the infants. Tryptophan and tyrosine metabolic pathways, as well as fatty acid and bile acid metabolism, were found to be affected by delivery mode and gestational age. Conclusions These findings confirm that mode of delivery and gestational age both have significant effects on early neonatal microbiota composition. There is also a significant difference between the metabolite profile of FT and PT infants. Prolonged breastfeeding was shown to have a significant effect on the microbiota composition of FT-CS infants at 24 weeks of age, but interestingly not on that of FT-SVD infants. Twins had more similar microbiota to one another than between two random infants, reflecting the influence of similarities in both host genetics and the environment on the microbiota.
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PubMed
高影响因子
Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhao Rui,Xiao Na,Liu Yufei,Zhan Wei,Wu Zhengshun
In order to solve the pollution problem of agricultural waste and realize the harmlessness, reduction and resource of abandoned rice husk, silica was successfully extracted from rice husk by sol–gel method and used for methane decomposition to produce hydrogen. The effects of reaction temperature and mass fraction of sodium carbonate on the yield of silica were studied. When the reaction temperature was 120℃ and Na 2 CO 3 was 9 wt.%, the yield of silica was 52.3%. The effects of acid on the pyrolysis behavior of rice husk and the purity and the specific surface area of derived silica were investigated. The results showed that the thermal stability of rice husk and the purity of SiO 2 were improved after acid pretreatment. Compared with the silica sample prepared without acid pretreatment (4.7m 2 /g), the specific surface area of the silicon dioxide pretreated by HAc (SiO 2 -HAc) increased to 27m 2 /g. Rice husk-derived silica was used as a catalyst to produce hydrogen from methane decomposition, SiO 2 -HAc showed good catalytic activity, and the conversion of methane increased from 17.01% to 38.83%. This change was attributed to the formation of –Si‒C‒ species, which promoted the decomposition of methane. On this basis, Ni/SiO 2 -HCl and Ni/SiO 2 -HAc catalysts were prepared by loading metal Ni on the surface of rice husk-derived silica, and the conversion of methane increased to 74.33% and 60.73%, respectively.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1258-1262
·
IF 2.726
Zhang Xingcong,Zhong Yunzhu,Chen Hongyu,Cheng Yujie,Sun Qingdi,Zhang Hao,He Qian,Zhang Ying,Guo Guanghui,He Xiaohui,Ji Hongbing
Through screening Ce precursors and pyrolysis temperatures [Ce(acac) 3 as Ce precursors and pyrolysis at 900 °C], zeolitic imidazolate framework-8(ZIF-8) derived nitrogen-doped carbon supported cerium single atom catalyst(Ce 1 /NC) is successfully prepared by ball milling method. The Ce 1 /NC catalyst exhibits exceptional catalytic performance in the selective oxidation of saturated C-H bonds in aromatic compounds, e.g. , 91% conversion and 99% selelctivity can be achieved in the oxidation of ethylbenzene to acetophenone under mild reaction conditions.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2023
·Vol. 17
·期 11
·1765-1775
·
IF 4.5
Xu Jialiang,Jian Jian,Dan Yixiao,Song Jie,Meng Lingxi,Deng Pei,Sun Weijie,Zhang Yusheng,Xiong Jinhua,Yuan Zhengqiu,Zhou Hu
A stable and recyclable of BiOBr/silk fibroin-cellulose acetate composite film was prepared by blending-wet phase transformation and in situ precipitate technology. The cellulose acetate film modified by silk fibroin formed a finger-shaped porous structure, which provided a large space for the uniform growth of BiOBr nanosheets and facilitated the shuttle flow of dyes in film. The morphology, phase structure, and optical properties of the composite films were characterized using various techniques, and their photocatalytic performance for dye wastewater was evaluated under visible light irradiation. Results showed that the BiOBr/SF-CA composite film exhibited efficient photocatalytic activity with 99.9% of rhodamine B degradation rate. Moreover, the composite film maintained high catalytic stability because Bi as the active species deposited on the film showed almost no loss. Finally, the possible photocatalytic mechanisms in the BiOBr/SF-CA composite film were speculated through radical-trapping experiments and electron spin resonance testing.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 7
·4553-4562
·
IF 3.917
Xiao Gang,He Jing,Chen Xiaodie,Qiao Yan,Wang Feng,Xia Qingyou,Yu Ling,Lu Zhisong
Abstract Development of wearable devices for in situ monitoring biological analytes in sweat has been fueled up in the past few years. Although microfluidic thread/paper-based analytical device (μTPAD) fulfills the requirements of wearable systems on flexibility and biocompatibility, it has not been employed as a sensing system for the in situ sweat analysis. In this work, we developed a wearable μTPAD containing a cotton thread and a functionalized filter paper for non-invasive, quantitative and in situ monitoring of human sweat glucose with the assistance of a smartphone. The oxygen plasma was applied to tailor the wicking property of the cotton thread. Amounts of enzymes and reagents on the filter papers were optimized to achieve the high-performance colorimetric sensing of glucose. The as-prepared device possesses a dynamic range of 50–250 μΜ and a detection limit of ~ 35 μΜ. Because of its great wearability and compatibility with conventional textile industry, the μTPAD was integrated with an arm guard to sensitively detect glucose in human sweat. This work may provide a low-cost, easy to use wearable device based on the cotton thread and filter paper for human sweat analysis. Graphical abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 11
·1-19
·
IF 2.8
Wang Lu,Zhou Ying-Hua,Liu Xiaoheng
Carbon fibers’ textile (CFT)-based flexible electrodes containing a large number of SnO 2 nanospheres and V 2 O 5 /SnO 2 nanoparticles were obtained by a facile one-pot template method. The homogeneously distributed SnO 2 and V 2 O 5 /SnO 2 exhibit an optimized worm-like mesoporous skeleton and an ideal pore size distribution with a highest surface area of around 295.5 m 2 ·g −1 and 198.0 m 2 ·g −1 , respectively. Using the mesoporous transition/mixed transition metal oxide nanomaterials simultaneously as both positive and negative electrodes, a solid-state flexible asymmetric supercapacitor was fabricated with the V 2 O 5 /SnO 2 @CFT as the positive electrode and SnO 2 @CFT as the negative electrode with well-widened voltage windows. Benefiting from the 3D controllable mesoporous architecture of electroactive species, the assembled supercapacitors delivered a high specific capacitance of 151.3 F·g −1 at 1 A·g −1 , and good rate stability with 70.9% capacitance retention at a higher current density of 5 A·g −1 . Notably, the device can operate in a wide voltage window (0~1.6 V), which enhance substantially the energy density to 193.6 Wh·kg −1 at a power density of 2880 W·kg −1 . These encouraging results are expected to open up a possibility of designing and fabricating the other metal oxide nanomaterials with mesoporous structure and uniform morphology for high-performance supercapacitors and other energy storage devices application.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 16
·11595-11606
·
IF 2.993
Wu Keliang,Dong Xuejun,Zhu Junfang,Wu Pengcheng,Liu Chang,Wang Yixi,Wu Jianning,Hou Juan,Liu Zhiyong,Guo Xuhong
The nanostructured heterojunction photocatalysts are considered promising in photocatalytic reduction in the carbon dioxide. Herein, we demonstrate a simple sol–gel and hydrolysis process to design nanostructured TiO 2 /ZnO heterojunction, by using the biological template celery stalk. The nanostructured photocatalyst consists of anatase TiO 2 and wurtzite ZnO nanoparticles. A well-connected heterojunction, with uniformly distributed nanoparticles, on the pores and folds of celery stems, is obtained. The enhanced specific surface area of 55.5 m 2 /g is achieved. The crystal structure, morphology and surface composition are investigated by electron microscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Furthermore, we demonstrate the photocatalytic performance of as-synthesized nanostructure TiO 2 /ZnO heterojunction. The photocatalytic yield, of CO 2 reduction into CH 4 , exhibits a five times increase, from 0.55 to 2.56 µmol h −1 g −1 , for the nanocomposite as compared to the pure TiO 2 . This enhanced performance corresponds to the efficient charge transfer and hindrance in the recombination of electron–hole pairs due to the optimum band positions of ZnO and TiO 2 . This study demonstrates the potential of using biotemplates to design efficient photocatalysts to convert CO 2 into useful solar fuels.
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高影响因子
危险品化学品经营许可证（带存储）