JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
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2019
·Vol. 319
·期 3
·1219-1225
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IF 1.186
Dai Ying,Cao Bin,Zhong Shimin,Xie Guanbao,Wang Youqun,Liu Yuhui,Zhang Zhibin,Liu Yunhai,Cao Xiaohong
Comparing with the traditionally immiscible two-phase extraction, the homogeneous liquid–liquid extraction technique shows potential in industrial separation engineering due to nearly infinite contact interface. In this work the ionic liquid (IL) compounds such as N -(carboxymethyl)- N , N -dimethylethanaminium bis-trifluoromethane-sulfonimide ([DHbet][Tf 2 N]) and N -(carboxyethyl)-trimethylammonium bistrifluoromethane-sulfonimide ([THbet][Tf 2 N]) were synthesized. The homogeneous extraction behaviors of europium with two ILs were studied as functions of solution pH, ionic strength, contact time, and initial europium concentration. The results indicated that both homogeneous extractions were dependent on pH and independent on ionic strength. The extraction capacities for [DHbet][Tf 2 N] and [THbet][Tf 2 N] were 3.29 mmol/L and 3.16 mmol/L, respectively. ILs could be recovered using 1.0 M hydrochloric acid. The mole-ratio method indicated the formation of a mononuclear complex between the europium ion and IL. Total europium extraction efficiencies of more than 91% for [DHbet][Tf 2 N] and more than 90% for [THbet][Tf 2 N] were obtained by quadruple-stage countercurrent extraction. The result proves the feasibility of the homogeneous liquid–liquid extraction technique as an alternative option for europium separation from aquatic solution.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 17
·16384-16394
·
IF 2.195
Dong Chao,Zhang Yanjie,Duan Jianjun,Yu Jingjie
A series of Eu 2+ and Eu 3+ coexisting Ca 2 P 2 O 7 phosphors with tunable red/blue (R/B) emission have been successfully synthesized by a two-step method. Phase composition, luminescence properties and surface states are investigated by the X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), photoluminescence (PL) emission spectra, fluorescence quantum efficiency, fluorescent lifetime and X-ray photoelectron spectroscopy (XPS). It can be concluded from XRD and FTIR results that pure Ca 2 P 2 O 7 phase can be obtained at 900 °C and Ca 3 (PO 4 ) 2 impurity phase occurs at an increasing preparation temperature (1100 °C). The XRD results confirm that the Eu 2+ or Eu 3+ doped samples all exhibit pure tetragonal Ca 2 P 2 O 7 crystal with space group P 4 1 . Under excitation of 330 nm, Eu 2+ singly-doped Ca 2 P 2 O 7 phosphors showed a broad blue emission band at 422 nm, while the Eu 3+ single-doped samples emitted a strong orange-red light with wavelength of 591, 597 and 618 nm excited by 395 nm. In particular, oxygen vacancies in pure Ca 2 P 2 O 7 crystal are found due to the strong PL emission at 420 nm. Furthermore, Eu 2+ /Eu 3+ co-doped Ca 2 P 2 O 7 phosphors prepared by this two-step synthesis show the blue emission at 422 nm (Eu 2+ ions) and the orange-red emission (Eu 2+ ions) at 591 nm, 597 nm and 618 nm under near-ultraviolet (NUV) excitation of 380 nm. It was detected that the quantum efficiency of the Ca 1.88 P 2 O 7 :0.12Eu phosphor was 37.7%. The tunable R/B emission ratio from 0.13 to 1.56 can be achieved by controlling the recalcined temperature in the second step when excited by 380 nm. The XPS demonstrate the existence of Eu 3+ ions on the surface of Eu 2+ /Eu 3+ co-doped Ca 2 P 2 O 7 phosphors. Under NUV excitation in the range from 350 to 400 nm, the optimum Commission International de I’Eclairage (CIE) coordinate of Ca 2 P 2 O 7 :0.12Eu 2+ /Eu 3+ phosphors is (0.3648, 0.215), which can be potentially used as an emitting source to meet the needs of illumination devices.
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
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2019
·Vol. 103
·期 20
·8351-8361
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IF 3.67
Liu Xiaofeng,Xia Yongjun,Zhang Yao,Yi Zhenwei,Meng Peng,Wang Guangqiang,Ai Lianzhong
This study describes the application of in situ extractive fermentation (ISEF) to increase the yields of antroquinonol (AQ) and antrodin C (AC) from Antrodia camphorata S-29. In initial screening experiments, nine solvents were tested to identify the most suitable extractant for the in situ extraction of AQ and AC. These solvents included n-tetradecane, n-dodecane, n-decane, heavy paraffin, light paraffin, oleyl alcohol, oleic acid, butyl oleate, and isopropyl myristate. Of these, oleic acid was the most suitable solvent for the in situ extraction of AQ and AC. The use of oleic acid as an in situ extractant significantly improved AQ and AC productions, which were approximately 5-fold and 8-fold that of the control, respectively. The recovered oleic acid was treated with a silica gel solid-phase extraction column, which was able to rapidly adsorb the bioactive metabolites. The separated solvent hardly contained fermentation products and could be directly reused in ISEF. AQ and AC were obtained with purities of over 75% by silica gel column chromatography. The recoveries of AQ and AC reached 70.7 ± 0.8% and 81.5 ± 1.2%, respectively.
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PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 26
·期 15
·15084-15094
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IF 2.914
Yao Zongbao,Wang Fang,Wang Chunliu,Xu Huacheng,Jiang Helong
Anaerobic ammonium oxidation coupled to ferric iron reduction (Feammox) has been assumed to play an important role in nitrogen removal from ecosystems. This study assessed the potential role of Feammox in nitrogen transformation in eutrophic lake sediment using an isotope tracing technique in sediment slurry incubation experiments. Feammox was discovered in eutrophic lake sediment. A significant correlation was found between Feammox rates and iron-reducing rates. Furthermore, the positive correlations between the abundance of iron-reducing bacteria (FeRB), such as Geobacteraceae spp. and Shewanella spp., and Feammox rates indicate that Feammox was mediated by FeRB. The potential rate of Feammox in the isotopic tracer incubation treatment was 0.23–0.43 mg N kg −1 day −1 . The estimated nitrogen loss caused by Feammox accounts for 5.0–9.2% of the human-induced N input annually into the eutrophic lake. Feammox alone or coupled with anaerobic ammonium oxidation (anammox) and/or denitrification may have an essential role in the nitrogen cycle within eutrophic lake sediment.
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高影响因子
Nature Communications
·
2019
·Vol. 10
·期 1
·1-11
·
IF 11.878
Feng Nan,Meng Ruijin,Zu Lianhai,Feng Yutong,Peng Chengxin,Huang Jimei,Liu Guanglei,Chen Bingjie,Yang Jinhu
The intercalation strategy has become crucial for 2D layered materials to achieve desirable properties, however, the intercalated guests are often limited to metal ions or small molecules. Here, we develop a simple, mild and efficient polymer-direct-intercalation strategy that different polymers (polyethyleneimine and polyethylene glycol) can directly intercalate into the MoS 2 interlayers, forming MoS 2 -polymer composites and interlayer-expanded MoS 2 /carbon heteroaerogels after carbonization. The polymer-direct-intercalation behavior has been investigated by substantial characterizations and molecular dynamic calculations. The resulting composite heteroaerogels possess 3D conductive MoS 2 /C frameworks, expanded MoS 2 interlayers (0.98 nm), high MoS 2 contents (up to 74%) and high Mo valence (+6), beneficial to fast and stable charge transport and enhanced pseudocapacitive energy storage. Consequently, the typical MoS 2 /N-doped carbon heteroaerogels exhibit outstanding supercapacitor performance, such as ultrahigh capacitance, remarkable rate capability and excellent cycling stability. This study offers a new intercalation strategy which may be generally applicable to 2D materials for promising energy applications.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 12
·8892-8906
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IF 3.442
Xu Ce,Wang Jin,Gao Boru,Dou Mengmeng,Chen Rui
In this work, a series of mesoporous graphitic carbon nitride (MCN) nanometer materials, loaded onto the reduced graphene oxide aerogel (rGOA) with macroscopic three-dimensional (3D) porous structure, were prepared using reduction self-assembly method. The composite aerogel of MCN/rGOA hybrid (MCN/GO mass ratio of 3:9) showed the highest adsorption rate of 73.7% for removing rhodamine b (RhB) solution of 20 mg L −1 , whereas the total effect of adsorption and visible-light catalysis reached 95.2% within 80 min. Meanwhile, the material also showed good stability, and the removal rate was still about 89% after repeating the experiments for five times. The material characterization was carried out using various techniques, which indicated that hybrid aerogels were successfully combined. The specific surface increases from 18 m 2 /g of MCN to 149 m 2 /g for MCN/rGOA hybrid. The hybrid aerogel not only has good adsorption effect, but also exhibits adequate photocatalysis. The composite firstly interacts with the RhB through π – π adsorption, and then, the photocatalysis is improved by increasing the electron transfer efficiency and inhibiting the electron–hole recombination for good conductivity. Through scavenger experiments, it is shown that h + free radicals are the dominant oxidizer during photocatalytic degradation.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 12
·2645-2652
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IF 3.286
Li Dongxian,Wang Shun,Wang Ling,Zhang Hao,Hu Jiandong
In this study, a simple colorimetric probe was developed for rapid and highly sensitive detection of malathion based on gold nanoparticles (AuNPs) anti-aggregation mechanism. A certain amount of NaOH can cause the aggregation of citrate-stabilized AuNPs due to the electrostatic interactions, and the color of AuNP solution changes from wine-red to gray. While in the presence of malathion, malathion is easily hydrolyzed in a strong alkali environment (pH > 9), followed by the production of a mass of negative charges, and thus the aggregated AuNPs turns to well-dispersed and the color of AuNP solution changes from gray to wine-red. This characteristic change can be visualized with the naked eye and quantitatively detected by an ultraviolet-visible (UV-Vis) spectrometer. Under optimized conditions, this probe exhibited a linear response to malathion in the concentration range of 0.05–0.8 μM with a limit of detection (LOD) down to 11.8 nM. The probe also showed good specificity for malathion detection in the presence of other interfering pesticide residues. Furthermore, the probe was successfully employed to detect malathion in environmental samples, with a recovery of 94–107% and a relative standard deviation (RSD) less than 8%. The results demonstrated that the proposed colorimetric probe based on anti-aggregation of AuNPs could be used for quantitative analysis of malathion and provided great potential for malathion determination in environmental samples.
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 4
·1-13
·
IF 1.784
Wu Yaping,Li Xingeng,Mi Chunxu,Zong Lijun,Wang Xiaoming
The superhydrophobic fluorosilicone/silica (FS/SiO 2 ) hybrid composite coating was easily fabricated by one-step blending method in this study, whose durable superhydrophobicity could be ensured by fluorosilicone resin (FS) matrix and perfluorine-SiO 2 nanoparticles. The prepared perfluorine-SiO 2 nanoparticles were detected using FESEM and FT-IR spectra, and the wettability and dispersion effects were studied. The surface morphologies and hydrophobicity of FS/SiO 2 coating on glass plates were investigated by AFM and optical contact angle meter, while the adhesion, wear-resistance and chemical regent-resistance for FS/SiO 2 superhydrophobic coating were also discussed. At last, the self-cleaning and anti-icing performances of prepared FS/SiO 2 superhydrophobic coating were explored. It could be found that the FS coating doped with more than 22% SiO 2 would exhibit superhydrophobicity. The water contact angle of the superhydrophobic FS coating could reach 161° and sliding angle 2° in the best condition. The superhydrophobic FS/SiO 2 coating possesses relatively satisfied mechanical and chemical stability. Moreover, the prepared superhydrophobic FS/SiO 2 hybrid composite coating provided an available selection of protecting surfaces against contamination and icing which validated the practicability.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2019
·Vol. 125
·期 8
·1-11
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IF 1.784
Dong Rui,Wang Luming,Zhu Jichao,Liu Lili,Qian Yanling
The nanohybrids of silicon dioxide–graphene oxide (SiO 2 –GO) were prepared by surface modification of graphene oxide (GO) by the hydrolysis of the tetraethoxysilane (TEOS) and then the SiO 2 –GO was added into acrylic resin as reinforcement to prepare acrylic nanocomposites. The structure of SiO 2 –GO was characterized by XRD, FT-IR, Raman and the morphology and dispersion study of SiO 2 –GO were observed by SEM and TEM. The results showed that the SiO 2 –GO was dispersed well in the acrylic resin matrix. Furthermore, the corresponding thermal, mechanical, and chemical resistance properties of the SiO 2 –GO/acrylic resin nanocomposites with mass ratios of SiO 2 –GO to acrylic resin (0.04, 0.06, 0.08, 0.10, and 0.12 wt%) were studied and compared with those of pure acrylic resin and the GO/acrylic resin nanocomposites with the same mass ratios of GO to acrylic resin. The results revealed that the loading of SiO 2 –GO effectively enhanced various properties of acrylic resin, which provides a new method for preparation of graphene nanocomposites.
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高影响因子
SN Applied Sciences
·
2019
·Vol. 1
·期 8
·1-8
·
IF 0
Xu Tingting,Wu Haotian,Cui Kun,Zhao Qiaoling,Huang Jin,Wei Liuhe,Ma Zhi
Abstract The hybrid TiO 2 /WO 3 nanoparticles with different doping ratios of tungsten were synthesized from titanium tetra-isopropoxide and tungsten hexachloride (WCl 6 ) as precursors via a sol–gel process using poly( ε -caprolactone)- b -poly(acrylic acid) (PCL- b -PAA) diblock copolymer as a template. The morphology, crystal structure, chemical and physical property of the fabricated TiO 2 /WO 3 nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy and so on. N 2 adsorption–desorption analysis revealed that the surface area (40.6 m 2 g −1 ), pore volume (0.11 cm 3 g −1 ) and average pore size (8.56 nm) of such TiO 2 /WO 3 nanoparticles. The resulting hybrid TiO 2 /WO 3 nanoparticles (average diameter: ca. 100–200 nm) with proper doping ratio of tungsten exhibited the enhanced photocatalytic activity than that of the commercial P25 in the degradation of methylene blue. Graphic Abstract
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IONICS
·
2019
·Vol. 26
·期 1
·245-254
·
IF 2.289
Qiao Jia,Zhou Haitao,Liu Zhongsheng,Wen Hejing,Du Juan,Wei Guokang,He Changlei,Yang Jianhong
Although Al-ion battery is attracting researchers’ attention worldwide, its volumetric energy density was not so promising due to low density of graphite-based positive electrodes in the current published literatures. Thus, defect-free yet densely packed graphene electrodes with high electronic conductivity and fast ionic diffusion are crucial to the realization of compacted Al-ion batteries with high volumetric energy density. In the present work, a self-supported and defect-free graphene-positive electrode (R H G-P-2850) was successfully produced by a hydriodic acid reduction of the graphene oxide (GO) method, followed by an ultrahigh temperature (2850 °C) annealing treatment. The density of the R H G-P-2850 (0.32 g cm −3 ) is currently the highest positive electrode material in the preparation of graphene-positive electrodes from GO. R H G-P-2850 positive electrode enables to deliver considerably high specific capacity 27.1 mAh cm −3 (85 mAh g −1 ) at the current density 2 A g −1 . More importantly, a remarkably stable performance was achieved with 20% fading over 8000 cycles. The results enlighten and promote the design and preparation of densely packed graphene-positive electrode to develop high-performance Al/graphene battery.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2019
·Vol. 26
·期 6
·1607-1618
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IF 1.947
Hou Pengchao,Xing Guangjian,Han Dan,Zhao Yan,Zhang Gang,Wang Hao,Zhao Chang,Yu Chunna
MIL-101(Cr)/graphene aerogel (MIL-101(Cr)/GA) was synthesized using a two-step synthesis and used as a high efficient adsorbent for wastewater purification. The as-prepared MIL-101(Cr)/GA was characterized using XRD, FTIR and Raman spectroscopy, XPS and FESEM to investigate its structure, composition and morphology. MIL-101(Cr)/GA exhibited a 3D interconnected macroporous framework comprised of graphene sheets, on which MIL-101(Cr) particles were dispersed uniformly. Dyes, organic solvents and oils were used to evaluate the adsorption performance of MIL-101(Cr)/GA, which exhibited an excellent adsorption capacity for both anionic methyl orange (331.5 mg g −1 ) and cationic rhodamine B (345.7 mg g −1 ) as well as 51–101 times its own weight of various solvents/oils. In addition, the MIL-101(Cr)/GA showed superior recycling stability for dyes and a rapid adsorption rate for solvents/oils. The excellent adsorption performance was attributed to a synergistic effect between MIL-101 and the graphene aerogel. The kinetic behavior for adsorption observed for MIL-101(Cr)/GA was well-fitted by a pseudo-second-order kinetic model. It is envisaged that MIL-101(Cr)/GA will be a promising adsorbent for the removal of pollutants and wastewater purification.
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