JOURNAL OF SURFACTANTS AND DETERGENTS
·
2016
·Vol. 19
·期 4
·681-691
·
IF 1.853
Zhao Xiaohui,An Dong,Ye Zhiwen
Two groups of disymmetric Gemini imidazolium surfactants, [C 14 C 4 C
m
im]Br 2 ( m = 10, 12, 14) and [C
m
C 4 C
n
im]Br 2 ( m + n = 24, m = 12, 14, 16, 18) surfactants, were synthesized and their structures were confirmed by 1 H NMR and ESI–MS spectroscopy. Their adsorption at the air/water interface, thermodynamic parameters and aggregation behavior were explored by means of surface tension, electrical conductivity and steady-state fluorescence. A series of surface activity parameters, including cmc, γ
cmc , π
cmc , p C
20 , cmc/ C
20 , Γ
max and A
min , were obtained from surface tension measurements. The results revealed that the overall hydrophobic chain length ( N
c ) for [C 14 C 4 C
m
im]Br 2 and the disymmetry ( m/n ) for [C
m
C 4 C
n
im]Br 2 had a significant effect on the surface activity. The cmc values decreased with an increase of N
c or m/n . The thermodynamic parameters of micellization (Δ G
θ m
, Δ H
θ m
, Δ S
θ m
) derived from the electrical conductivity indicated that the micellization process of [C 14 C 4 C
m
im]Br 2 and [C
m
C 4 C
n
im]Br 2 was entropy-driven at different temperatures, but the contribution of Δ H
θ m
to Δ G
θ m
was enhanced by increasing N
c or m/n . The micropolarity and micellar aggregation number ( N
agg ) were estimated by steady-state fluorescence measurements. The results showed that the surfactant with higher N
c or m/n can form larger micelles, due to a tighter micellar structure.
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CHROMATOGRAPHIA
·
2017
·Vol. 80
·期 3
·463-471
·
IF 1.402
Xu Mei,Chen Kun,Luo Chen,Song Guoxin,Hu Yaoming,Cheng Hefa
Abstract In this paper, a simple but efficient method for the extraction and analysis of bifenthrin in water samples was proposed. The Fe 3 O 4 -based nanocomposites (Fe 3 O 4 @m-SiO 2 /PSA@Zr-MOF) were successfully synthesized and developed as adsorbents for magnetic solid-phase extraction. With the solvothermal reaction and sol–gel method, the resultant adsorbents exhibited excellent characteristics of large surface areas, homogeneous pore size, strong magnetic responsivity and high hydrophilicity. The parameters affecting the extraction performance including adsorbent amounts, adsorption time, species of eluents and desorption time were investigated. Under the optimal conditions, validation experiments such as recovery, reproducibility and limits of detection (LOD) were carried out and showed satisfactory results. The LOD of the targeted analytes was found to be 0.5 μg L −1 . The average recovery was 103.2% with the intra-day and inter-day relative standard deviations of 2.0 and 3.5%, respectively. Ultimately, the novel magnetic adsorbents were successfully applied to detect the bifenthrin compound in real water samples. Graphical Abstract
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Biomass Conversion and Biorefinery
·
2022
·
IF 4.05
Zhao Mengxing,Liu Yingying,Yin Peipei,Wu Shijie,An Xingye,Qin Tong,Liu Hongbin
Extraction of tobacco extracts from tobacco leaf scraps can promote the maximum utilization of tobacco waste and offer tobacco industries a formula to improve cigarette qualities and flavors. Tobacco extracts can be used as a reconstituted tobacco coating solution for reconstituted tobacco sheet (RTS)-based paper. Aroma components in the tobacco extracts can determine the fragrance style of the RTS. However, traditional extraction methods usually have many problems. Herein, the ultrasound-assisted enzymatic hydrolysis was first applied to improve the aroma of tobacco extracts from tobacco leaf scraps. After ultrasound-assisted enzymatic hydrolysis, the total aroma components content in tobacco extracts was increased by 5.0 times compared with that in aqueous extracts, and the total extraction yield was increased by 51.57%. Moreover, other compositions in tobacco extracts, including total sugar, nicotine, lignin, total phenols, formic acid, and acetic acid were also increased. This study provides a method to improve the aroma in the tobacco extracts and the quality of RTS. Graphical abstract
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 4
·1120-1129
·
IF 2.936
Wang Hongkang,Chai Shanshan,Li Panpan,Yang Yijun,Wang Xi
Propane dehydrogenation to propylene, one of the most significant compounds in the chemical industry, has attracted tremendous attention worldwide. A series of V doped graphitic carbon nitride composites (V-g-C 3 N 4 ) were synthesized via a combination of thermal polymerization of urea and thermal decomposition of NH 4 VO 3 . After doping VO x species, the V doped g-C 3 N 4 catalysts achieved an optimal propylene yield of 16.16% with a propylene selectivity of 68.6% at 600 °C, compared with undoped g-C 3 N 4 (a propylene yield of 5.42% with a propylene selectivity of 53.9%) at the same condition. Subsequently, various characterization techniques, including XRD, TEM, FTIR, Raman, XPS, N 2 adsorption–desorption, etc., were unitized to investigate the chemical properties and crystalline structures of the prepared catalysts. The essence of catalytic enhancement, such as crystallinity, the main active VO x species, and the newly emerging V–N bonds in V-g-C 3 N 4 catalysts, has been discussed, providing a tentative reaction pathway for CH 3 (*CH)CH 3 and CH 3 CHCH 2 * species on V active sites. In general, this work offers a research basis for the bran-new materials design for propane dehydrogenation. Graphical Abstract
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 9
·1-9
·
IF 5.479
Chen Yao,Zhang Xiao-Fang,Wang Ai-Jun,Zhang Qian-Li,Huang Hong,Feng Jiu-Ju
A pyrolytic method is described for preparation of ultrafine Fe 3 C nanoparticles incorporated into N-doped graphitic carbon nanosheets (Fe 3 C@NGCSs). Iron phthalocyanine and graphitic carbon nitride (g-C 3 N 4 ) are used as starting materials. The hybrid nanocomposite was placed on a glassy carbon electrode (GCE) and then applied to simultaneous determination of ascorbic acid (AA), dopamine (DA), uric acid (UA) and xanthine (XA). Figures of merits are as follows: for AA, the linear response range covers the 54.0–5491.0 μM range, the lower detection limit is 16.7 μM, and the best working voltage (vs. the saturated calomel electrode (SCE)) is 0.05 V. The respective data for DA are 1.2–120.8 μM, 0.34 μM and 0.19 V (vs. SCE). For UA, the respective data are 4.8–263.0 μM, 1.4 μM and 0.32 V (vs. SCE), and for XA the data are 4.8–361.0 μM, 1.5 μM and 0.71 V (vs. SCE). The method was successfully applied to their simultaneous determination in spiked serum samples.
Ultrafine Fe 3 C nanoparticles embedded in N-doped graphitic carbon sheets for simultaneous determination of ascorbic acid, dopamine, uric acid and xanthine.
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1145-1157
·
IF 11.806
Duan Xiaoyuan,Cheng Shuaishuai,Tao Rongyao,Zhang Zhiyi,Zhao Guizhe
Graphene was widely used to reinforce rubber composites due to its excellent mechanical and thermal properties. When graphene rubber was applied to tires, it often faces the problem that mechanical properties and thermal control capability could not be optimized simultaneously. The f-(SiO 2 -KH550/GO) (f-SKG) particle with a flexible shell structure and vulcanization effect was chemically grafted on the molecular chain of natural rubber (NR) by the thiol-ene click reaction. Since the sulfhydryl functional groups on the surface of the f-SKG particles could act as a bridge to connect the NR molecular chains, more NR molecules were confined on the surface of the f-SKG particles. This enhanced filler-matrix interface interaction and good dispersibility synergistically enhanced the rubber composites to obtain excellent mechanical properties, low heat generation performance (19 ℃) and good thermal conductivity (0.55 Wm −1 K −1 ). This not only met the requirements of tire rubber for mechanical properties, but also significantly improved the thermal control ability of graphene rubber tires. More importantly, through finite element simulation and experimental verification, the influence of the thermal conductivity and loss factor of rubber on tires was revealed. This strategy provided creative insights for the preparation of high-performance graphene rubber tires. Graphical abstract Graphene-filled rubber with point-surface structure has enhanced interfacial interaction and thermal control ability, which promotes the development of green tires
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Frontiers of Chemical Science and Engineering
·
2021
·Vol. 16
·期 3
·384-396
·
IF 4.204
Liu Xiangyu,Pan Yanling,Zhang Peng,Wang Yilin,Xu Guohao,Su Zhaojie,Zhu Xuedong,Yang Fan
Alkylation of benzene to value-added, high octane number and low toxic toluene and xylenes provides a way to lower benzene content in gasoline pool, and is hence a method to promote fuel quality. On the other hand, CO 2 accumulation in the atmosphere causes global warming and requires effective route for its valorization. Utilization of CO 2 as a carbon source for benzene alkylation could achieve both goals. Herein, alkylation of benzene with CO 2 and H 2 was realized by a series of low-cost bifunctional catalysts containing zinc/titanium oxides (Zn/Ti oxides) and HZSM-5 molecular sieves in a fixed-bed reactor. By regulating and controlling oxygen vacancies of Zn/Ti oxides and the acidities of HZSM-5, benzene conversion and CO 2 conversion reached 28.7% and 29.9% respectively, along with a total selectivity of toluene and xylene higher than 90%. In this process, more than 25% CO 2 was effectively utilized and incorporated into the target products. Moreover, the mechanism of the reaction was analyzed and the course was simultaneously traced. CO 2 was transformed into methanol firstly, and then methanol reacted with benzene generating toluene and xylene. The innovation provides a new method for upgrading of fuels and upcycling the emissions of CO 2 , which is of great environmental and economic benefits.
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IONICS
·
2019
·Vol. 26
·期 2
·719-726
·
IF 2.289
Hu Le,Shang Chaoqun,Huang Lanyan,Wang Xin,Zhou Guofu
The sodium storage performance of Ge-based materials suffers from poor cycling stability caused by the volume variation and collapse of the structure during cycling process. In this work, Cu 3 Ge coated by nitrogen-doped carbon (Cu 3 Ge-NC) nanorods are prepared by annealing the mixture of CuGeO 3 nanowires and polyacrylonitrile which acts as nitrogen and carbon source. As anode materials for sodium ion batteries, the outside carbon shell inhibits the serious volume change caused by Na + insertion/extraction, and the Cu 3 Ge alloy enhances the sodiation capacity with rapid electron transfer and fast reaction kinetics. Corresponding kinetic analysis indicates pseudocapacitive behaviors play a dominant role in the total capacity at high rates. Hence, the Cu 3 Ge-NC exhibits favorable rate capability and cycling stability, which delivers a reversible capacity of 160 mAh g −1 for 500 cycles at a current density of 100 mA g −1 .
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 48
·21853-21868
·
IF 4.682
Yang Hongzhi,He Tianpei,Wu Yaohui,Luo Jinhua,Zhang Aihua,Chen Xiaoyong,Zeng Yelin,Wang Yonghong,Zhao Yunlin,Wang Guangjun
A novel PbMoO 4 @MBC (MBL-2) magnetic heterojunction photocatalyst was prepared by the successful loading of Fe 3 O 4 with PbMoO 4 onto the highly conductive BC surface through the integration of co-precipitation and pyrolysis. Using advanced characterization methods could reveal the composition, morphology, and optoelectronic properties of the material. The results showed that using BC as the electron transfer interface provided a pathway for charge transfer between Fe 3 O 4 and PbMoO 4 , and importantly, the PbMoO 4 @MBC (MBL-2) nanocomposite had a large specific surface area, excellent magnetic response, high light absorption capacity for efficient carrier separation, and thus the photocatalytic activity was high. The degradation rate of MBL-2 for TC under visible light was as high as 89%. More importantly, PbMoO 4 @MBC (MBL-2) possessed good stability and reusability. The Z-scheme electron transfer pathway for improved photocatalytic performance was proposed by radical capture experiments and electron spin resonance (ESR) measurement analysis. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 10
·8838-8846
·
IF 2.324
Zhang Hailiang,Yuan Shuai,Qiu Zhiwen,Jiang Yanan,Zhu Xiaomeng,Wan Xingxing,Cao Bingqiang
Copper iodide (CuI) thin film grown by a direct vacuum thermal evaporation method at low temperature is utilized as inorganic hole transport layer in planar CH 3 NH 3 PbI 3−x Cl x -based perovskite solar cell. The device performance is mainly controlled by the deposition rate of CuI layer for optimized thickness. The reason was investigated in detail by transient photovoltage/photocurrent spectroscopy (TPV/TPC), X-ray photoelectron spectroscopy (XPS), and the energy-dispersive X-ray spectrum (EDS). The results indicate that larger deposition rate leads to a non-stoichiometric CuI layer with excess iodine. More importantly, the redundant iodine is illustrated as the recombination center that results in interface recombination. Under optimized CuI growth condition, a power conversion efficiency of 6.4% has been achieved with a short-circuit current density (J SC ) of 16.4 mA/cm 2 , an open-circuit voltage (V OC ) of 730 mV, and a fill factor (FF) of 54%. Our results open a possibility for further improvement of perovskite solar cells by controlling the concentration and distribution of iodine in the perovskite films.
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IONICS
·
2018
·Vol. 25
·期 6
·2781-2789
·
IF 2.347
Chen Yujuan,Sun Li,Lu Zhiwei,Liu Zhaoen,Jiang Yuyang,Zhuo Kelei
In this paper, nitrogen and sulfur co-doped graphene aerogel (NS-GA) was successfully prepared using ionic liquid 1-(4-mercaptobutyl)-3-methylimidazolium bromide (HS-BMIMBr) as both reductant and dopant by a one-step hydrothermal method. The results of X-ray diffraction indicate that the doping of heteroatoms into graphene increases its degree of defects. In addition, scanning electron microscopy measurements and nitrogen adsorption–desorption analysis reveal that the as-prepared NS-GA has unique hierarchical porous nanostructures, which supply efficient networks for ionic transports and electron transfer. The symmetric electrical double-layer capacitors (EDLCs) based on the NS-GA with ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate, EMIMBF 4 ) as the electrolyte show excellent capacitive performance. And the NS-GA has a high specific capacitance of 182.3 F g −1 at a current density of 1 A g −1 . Moreover, there is a high energy density of 101 Wh kg −1 at a power density of 1 kW kg −1 . Therefore, the NS-GA can be considered as a favorable electrode material for high-performance energy storage devices.
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Nature Communications
·
2019
·Vol. 10
·期 1
·1-9
·
IF 11.878
Ye Kai-Hang,Li Haibo,Huang Duan,Xiao Shuang,Qiu Weitao,Li Mingyang,Hu Yuwen,Mai Wenjie,Ji Hongbing,Yang Shihe
We herein demonstrate the unusual effectiveness of two strategies in combination to enhance photoelectrochemical water splitting. First, the work function adjustment via molybdenum (Mo) doping significantly reduces the interfacial energy loss and increases the open-circuit photovoltage of bismuth vanadate (BiVO 4 ) photoelectrochemical cells. Second, the creation and optimization of the heterojunction of boron (B) doping carbon nitride (C 3 N 4 ) and Mo doping BiVO 4 to enforce directional charge transfer, accomplished by work function adjustment via B doping for C 3 N 4 , substantially boost the charge separation of photo-generated electron-hole pairs at the B-C 3 N 4 and Mo-BiVO 4 interface. The synergy between the above efforts have significantly reduced the onset potential, and enhanced charge separation and optical properties of the BiVO 4 -based photoanode, culminating in achieving a record applied bias photon-to-current efficiency of 2.67% at 0.54 V vs. the reversible hydrogen electrode. This work sheds light on designing and fabricating the semiconductor structures for the next-generation photoelectrodes.
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