TOPICS IN CATALYSIS
·
2017
·Vol. 60
·期 12
·980-986
·
IF 2.486
Zhang Xiuling,Li Zhuang,Zhan Zhibin,Di Lanbo
F-Doped TiO 2 was successfully fabricated using gas–liquid cold plasma with different fluorine sources, including NaF, NaF combined with [C 4 MIM]HSO 4 , and [C 4 MIM]BF 4 . The samples were characterized by XRD (X-ray diffraction), XPS (X-ray photoelectron spectroscopy), and BET (N 2 adsorption–desorption isotherms). Photocatalytic activity of the samples was tested by degradation of methylene blue (MB) dye under simulated sunlight. The results show that doping with different fluorine sources was beneficial to form interstitial F-doped TiO 2 , and ionic liquids used in our work were most favorable to the formation of interstitial F-doped TiO 2 . Calcination of the 0.6-F–[C 4 MIM]BF 4 –TiO 2 sample at 500 °C shows that interstitial F-doped TiO 2 has an excellent thermal stability, a suitable mesoporous structure, higher specific surface area (60.5 m 2 g −1 ) and the best photocatalytic activity. MB degradation was about 98% under the stimulated sunlight for 30 min, and its apparent rate constant was 42 times higher than photolysis and was about 2.9 times as that prepared without addition of ionic liquid. Furthermore, the stability of ionic liquids in the gas–liquid plasma was also investigated and discussed with the assistance of Fourier transform infrared (FTIR) spectroscopy.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 21
·期 8
·2355-2364
·
IF 2.316
Wang Ailian,Xu Hao,Zhou Qian,Liu Xu,Li Zhengyao,Gao Rui,Liu Xiangfeng,Zhang Liaoyun
A new composite polymer electrolyte membrane composed of hyperbranched star polymers (HBPS-(PMMA- b -PPEGMA) 30 (the hyperbranched star polymer with hyperbranched polystyrene as core and polymethyl methacrylate block poly(ethylene glycol) methyl ether methacrylate) as arms)), ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF 4 ) or 1-butyl-3-methylimidazolium hexafluorophosphate (BMImPF 6 )), and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI) has been fabricated by solution casting method. This type of solid polymer electrolyte membrane shows an excellent flexibility, transparency, and free-standing properties. Room temperature ionic conductivity of composite electrolytes with 40 wt% BMImBF 4 or 40 wt% BMImPF 6 can reach 2.5 × 10 −4 and 4.1 × 10 −5 S cm −1 , respectively. The HBPS-(PMMA- b -PPEGMA) 30 /BMImPF 6 /LiTFSI (the composite polymer electrolyte with 1-butyl-3-methylimidazolium hexafluorophosphate) composite polymer electrolyte displays better performances including a good thermal stability with decomposition temperature of 350 °C, a wide electrochemical window with oxidation potential of 4.3 V, and the excellent interfacial compatibility with lithium electrode. Moreover, the Li/LiFePO 4 batteries based on HBPS-(PMMA- b -PPEGMA) 30 /BMImPF 6 /LiTFSI electrolyte retain about 96% of their highest discharge capacity (120.5 mAh g −1 ) after 100 cycles under a current density of 0.1 C at 60 °C, exhibiting the excellent reversible cyclability.
The free-standing composite electrolyte films composed of ionic liquids, hyperbranched star polymers and lithium salts show the high ionic conductivities.
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BIOPROCESS AND BIOSYSTEMS ENGINEERING
·
2016
·Vol. 40
·期 1
·1-7
·
IF 1.901
Zhao Fuhua,Hou Tonggang,Wang Jianxun,Jiang Yijun,Huang Shuxia,Wang Qiao,Xian Mo,Mu Xindong
Enzyme immobilization is believed to provide an excellent base for increasing environmental tolerance of enzyme and considerable period of time. In this work, a kind of nonporous silica nanoparticles functionalized with amino group was synthesized to immobilize proline-specific endoprotease (PSEP). PSEP is known to specifically cleave peptides (or esters) at the carboxyl side of proline, thus can prevent the formation of haze and prolong the shelf life of beer. After immobilization, the environmental tolerance (temperature and pH, respectively) was obviously improved, and the immobilized enzyme can retain above 90 % of its original activity after 6 uses. Moreover, the immobilized enzyme can effectively prevent the formation of chill-haze using fresh beer fermentation liquid.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 28
·期 1
·582-587
·
IF 1.798
Cao Renping,Wang Wudi,Zhang Jinlong,Hu Qianglin,Jiang Shenhua,Xiao Fen,Ye Yuanxiu
CaZr(PO 4 ) 2 :Mn 2+ and CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphors are synthesized by high-temperature solid state reaction method in air. CaZr(PO 4 ) 2 :Mn 2+ phosphor shows green emission and its broad emission band peaking at ~545 nm within the range 470–650 nm is attributed to the 4 T 1 (G) → 6 A 1 ( 6 S) transition of Mn 2+ ion. The optimal Mn 2+ doping concentration is ~5 mol% in CaZr(PO 4 ) 2 :Mn 2+ phosphor. CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor with excitation 399 nm emits reddish-orange light, and it shows a systematically varied hue from green to yellow with excitation 405 nm by changing Sm 3+ and Mn 2+ ions concentration. The luminous mechanism of CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor is analyzed and explained by the simplified energy level diagrams of Mn 2+ and Sm 3+ ions in CaZr(PO 4 ) 2 :Mn 2+ , Sm 3+ phosphor. The experimental results are helpful to develop new Mn 2+ /Sm 3+ -doped materials.
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JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 51
·期 24
·10849-10862
·
IF 2.302
Zhang Man,Li Chuan,Gao Huiqi,Fu Wei,Li Yingying,Tang Liwei,Zhou Zhiming
Twelve salts of 3-nitro-1,2,4-triazol-5-one (NTO) (ammonium, hydrazinium, guanidinium, aminoguanidinium, diaminoguanidinium, triaminoguanidinium, N -carbamoylguanidinium, semicarbazidium, 1,5-diamino-1,2,4-tetrazolium, 3,4,5- triamino-1,2,4-triazolium, 3,6,7-triamino-7H-[1, 2, 4]triazolo[5,1-c][1,2,4]triazol-2- ium, and 4,4′,5,5′-tetraamino-3,3′-bi-1,2,4-triazolium) were synthesized. The new salts were fully characterized by 1 H and 13 C NMR spectroscopy, infrared spectroscopy, and elemental analysis. The crystal structures of salts 10 and 11 were determined by single-crystal X-ray diffraction. All energetic salts except salt 6 exhibit excellent thermal stabilities with decomposition temperatures ranging from 203 to 270 °C. The densities of salts ranged from 1.65 to 1.88 g cm −1 as measured by a gas pycnometer. Theoretical performance calculations (Gaussian 03 and EXPLO5 v6.01) yielded detonation pressures and detonation velocities for the energetic salts, ranging from 24.4 to 38.1 GPa and 8136 to 9575 m s −1 , respectively. In particular, salt 2 has an outstanding detonation performance ( P
cj = 38.1 GPa, v
D = 9575 m s −1 ) with a satisfactory acidity compared to that of NTO ( pK
a = 5.63 versus pK
a = 2.37). Furthermore, the particles of salt 2 form two-dimensional blades of submicron size, as determined by scanning electron microscopy analysis. Meanwhile, salt 2 was compatible with TNAZ, TATB, TKX-50, Al, NH 4 ClO 4 , CL-20, TNT, and F2603 fluororubber, as determined by differential scanning calorimetry or vacuum stability tests.
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TRIBOLOGY LETTERS
·
2016
·Vol. 64
·期 1
·1-9
·
IF 1.758
Chen Li,Zhang Xiaosheng,Xu Hong,Dong Jinxiang
The tribological properties of α-Zr(HPO 4 )·H 2 O and Cu(OH) 2 Zr(HPO 4 ) 2 ·2H 2 O (α-ZrP and Cu-α-ZrP, respectively) were investigated in lithium grease by using an optimol SRV-V oscillating reciprocating friction and wear tester (SRV). α-ZrP had excellent anti-wear and friction-reducing properties regardless of the applied load, frequency, and test duration. The applied load for α-ZrP reached 600 N, and the corresponding friction coefficient was 0.082. At 60 Hz, the wear volume rate was 11.16 × 10 −9 mm 3 /Nm. The tribological properties of Cu-α-ZrP were dependent on the test conditions, especially at higher frequency. The α-ZrP worn steel surfaces were smooth and shallow as indicated from scanning electron microscopy and a three-dimensional non-contact surface mapping profiler. Related elements were detected by energy-dispersive X-ray spectroscopy on the rubbed surfaces. A boundary solid film may form on the worn surfaces after friction tests. In reciprocating mode, α-ZrP stuck on the contacting surfaces, which enabled it to form a stable solid lubricant film more effectively than Cu-α-ZrP. The crystal structure may be important for film strength under high loads, especially at high speed.
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WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 9
·1-13
·
IF 1.551
Ma Yulin,Gu Na,Gao Jinlong,Wang Kuitao,Wu Yunxia,Meng Xiaoyu
Fe 3 O 4 -CuO@montmorillonite was prepared using coprecipitation method, and its structure was determined by XRD, IR, and transmission electron micrograph (TEM). Montmorillonite in Fe 3 O 4 -CuO@montmorillonite nanocomposite allowed the silicate layer of montmorillonite to behave as a barrier, which prevented the agglomeration and natural crystallization of Fe 3 O 4 and CuO. Furthermore, the chlorine dioxide (ClO 2 ) oxidative degradation of anthracene-contaminated soil was studied in detail using Fe 3 O 4 -CuO@montmorillonite as a magnetic heterogeneous catalyst. The operating parameters such as ClO 2 concentration, catalyst dosage, reaction time, and pH were evaluated. Compared with the conventional ClO 2 oxidation process without the catalyst, the ClO 2 catalytic oxidation system could significantly enhance the degradation efficiency. Under the optimal condition (anthracene concentration 89.8 mg/kg, water soil mass ratio 3:1, initial pH 7, ClO 2 concentration 1 mol/kg, catalyst dosage 1 g/kg, reaction time 30 min, and reaction temperature 25 °C), anthracene degradation efficiency achieved 96.2 %. The catalyst could be easily reused by magnetic separation and used at least 8 cycles without obvious loss of activity. The kinetic studies revealed that the ClO 2 catalytic oxidation degradation of anthracene-contaminated soil with Fe 3 O 4 -CuO@montmorillonite as catalyst followed pseudo-first-order kinetics with respect to ClO 2 concentration. Thus, this study showed potential application of ClO 2 catalytic oxidation process in remediation of organic pollutant-contaminated soil.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-7
·
IF 4.58
Tan Qingqing,Zhang Ruirui,Kong Rongmei,Kong Weisu,Zhao Wenzhi,Qu Fengli
The authors describe a novel method for the determination of glutathione (GSH). Detection is based on target induced release of glucose from MnO 2 nanosheet-gated aminated mesoporous silica nanoparticles (MSNs). In detail, glucose is loaded into the pores of MSNs. Negatively charged MnO 2 nanosheets are assembled on the MSNs through electrostatic interactions. The nanosheets are reduced by GSH, and this results in the release of glucose which is quantified by using a commercial electrochemical glucose meter. GSH can be quantified by this method in the 100 nM to 10 μM concentration range, with a 34 nM limit of detection.
Glucose is loaded into the pores of mesoporous silica nanoparticles (MSNs). MnO 2 nanosheets are assembled on MSNs through electrostatic interactions. Glutathione (GSH) can reduce the nanosheets, and this results in the release of glucose which is quantified by using a commercial glucose meter.
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AAPS PHARMSCITECH
·
2017
·Vol. 19
·期 3
·1141-1151
·
IF 2.451
Chen Jianmin,Huang Weiyue,Huang Ziyao,Liu Shiqi,Ye Yaling,Li Qinglian,Huang Meiping
Dissolving microneedles (MNs) offered a simple, minimally invasive method for meloxicam (MX) delivery to the skin. However, the fabrication of dissolving MNs still faced some challenges, such as significant time consumption, loss of drug activity, and difficulty in regulating MN drug loading. To address these issues, we developed the tip-dissolving (TD) MNs. Several kinds of drugs were encapsulated successfully, and the quantity of MX ranged from 37.23 ± 8.40 to 332.53 ± 13.37 μg was precisely controlled. The effects of fabrication process on biomacromolecules stability were studied, and it was found that tyrosinase kept 90.4% activity during the fabrication process. The whole process for the fabrication of MNs only takes approximately 1 h. In order to further evaluate the potential of the TD MNs, MX TD MNs were prepared for in vitro release experiments, in vivo release experiments, safety evaluation, pharmacokinetic studies, and pharmacodynamic studies. The results demonstrated that MX TD MNs offered several advantages, including rapid release of the encapsulated drug (91.72% within 30 min), efficient drug delivery to skin (79.18%), no obvious skin irritation, decent relative bioavailability (122.3%), and strong anti-inflammatory and analgesic effects. Based on these results, we envisage that the TD MNs have promising potential for transdermal drug delivery of MX.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2017
·Vol. 410
·期 2
·441-449
·
IF 3.431
Li Yuanyuan,Zhu Nan,Ma Yulong,Li Qiang,Li Peng
Material with a core–shell structure based on a porous silica core and Ag nanoparticles (AgNPs) as shell (SiO 2 @Ag) was prepared with the seed growth method. Cellulose derivatives as chiral selectors were coated on the surfaces of SiO 2 @Ag particles by means of coating and intermolecular polycondensation as chiral stationary phases (CSPs), respectively. Fifteen racemates were used to evaluate their chiral recognition ability by high-performance liquid chromatography (HPLC). The results implied that the CSPs based on SiO 2 @Ag particles obtained stronger interaction with the analytes leading to better enantioseparation due to the existence of AgNPs on the surfaces of silica gel, compared with a cellulose derivative-modified silica column. In addition, the new CSPs showed special selectivity for ketone enantiomers, and AgNPs played a synergistic effect with cellulose derivatives on enantioseparation.
Schematic of SiO 2 @Ag stationary phase
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JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2017
·Vol. 84
·期 3
·422-431
·
IF 1.575
Kong Yong,Zhang Jiayue,Shen Xiaodong
Abstract Amine hybrid titania/silsesquioxane composite aerogel (AHTSA) was prepared by an one-pot sol–gel process without any catalyst. The sol-gel reaction mechanism of AHTSA was proposed. The use of 3-aminopropyltriethoxysilane (APTES) plays as an “internal catalyst” and promotes the formation of gel during sol–gel process. The morphology, microstructure, pore structure and CO 2 capture performances of AHTSA were investigated. AHTSA exhibits microstructure of the typical silica aerogels with colloidal structure. Moreover, AHTSA has a large number of macropores which favor the CO 2 adsorption. Thermogravimetric analysis reveals that AHTSA has a high CO 2 /N 2 selectivity in CO 2 /N 2 mixture gas. CO 2 adsorption capacity with dry and humid 1 vol% CO 2 is as high as 4.19 and 5.04 mmol/g, respectively. Correspondingly, amine efficiency under dry and humid conditions is 0.37 and 0.44, respectively. AHTSA has very short adsorption halftime below 4 min, and its CO 2 adsorption capacity do not show obvious attenuation after 30 adsorption-regeneration cycles, indicating AHTSA is a dynamic and regenerable sorbent. Graphical abstract
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Food Analytical Methods
·
2017
·Vol. 11
·期 3
·797-807
·
IF 2.038
Yin Qinhong,Zhu Yanqin,Yang Yaling
In this study, a two-step extraction technique was developed for extraction and preconcentration of parabens from beverage samples using ionic liquid dispersive liquid–liquid microextraction (IL-DLLME) and magnetic solid-phase extraction (MSPE). In this IL-DLLME followed by MSPE method, ionic liquid (IL, 1-octyl-3-methylimidazolium hexafluorophosphate) formed hydrophobic microdroplets in beverage samples as an extractant of parabens; after the IL-DLLME process was completed, graphene modified Fe 3 O 4 nanoparticles (Fe 3 O 4 @G) were placed to adsorb and isolate IL from the sample solution. After the supernatant was carefully moved, acetonitrile was added to elute the IL containing parabens from Fe 3 O 4 @G. The experimental variables affecting the extraction procedure have been systematically studied. Under optimal conditions, the detection limits were less than 1.53 ng/mL and the linear detection ranges were 2–500 ng/mL ( R
2 ≥ 0.998) for these analytes. The recoveries for spiked samples were 58.8–89.2% and satisfactory precision (RSD ≤ 4.8%) were obtained.
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