FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 9
·1898-1907
·
IF 1.353
Yu Deyou,Wu Minghua,Lin Junxiong,Zhu Jintao
Conventional cotton bleaching is highly energy-intensive, water-dependent, and textile-damaging. The technologies currently used to achieve low-temperature bleaching always include a conflict between effectiveness and cost. This study represents an economically efficient process for cotton bleaching with H 2 O 2 at low temperature. A novel system that couples Cu 2+ with HCO
− 3
, has been developed to activate cotton bleaching. Factors that influence the bleaching performance were investigated, including the bleaching temperature and initial concentrations of the components (H 2 O 2 , NaHCO 3 and Cu 2+ ). The experimental results indicated that the Cu 2+ -HCO
− 3
/H 2 O 2 system had a lower operating cost and higher bleaching efficiency than conventional and TAED-activated systems. Additionally, the bleaching bath exhibited excellent reusability, further strengthening its feasibility for industrial applications. The results of HO• scavenging and Cu 2+ monitoring experiments implied that the bleaching active species might be the Cu(III) species rather than HO•. This novel system provides a simple, effective, and cost-efficient method for practical bleaching.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 10
·1-6
·
IF 5.705
Ma Liang,Guo Ting,Pan Shuli,Zhang Yuhao
A fluorometric patulin (PAT) assay is presented that is based on the use of magnetic reduced graphene oxide (rGO) and DNase I. The fluorescence of the PAT aptamer labelled with 6-carboxyfluorescein (FAM) is quenched by magnetized reduced graphene oxide (rGO-Fe 3 O 4 ) due to fluorescence resonance energy transfer (FRET). However, in the presence of PAT, the labelled aptamer is stripped off from rGO-Fe 3 O 4 . The rGO-Fe 3 O 4 is then magnetically separated so that the fluorescence of free labelled PAT aptamer is restored. DNase I cannot hydrolyze the aptamer on rGO-Fe 3 O 4 , but it can cleave the free aptamer-PAT complex. This will release FAM and PAT which can undergo a number of additional cycles to trigger the cleavage of abundant aptamer. Recycling of DNase I-assisted target therefore leads to a strong amplification of fluorescence and consequently to an assay with low limit of detection. The detection limit for PAT is as low as 0.28 μg L −1 which is about 13 times lower than that without using DNase I. The method offers a new approach towards rapid, sensitive and selective detection based on an aptamer. Conceivably, it has a wide scope in that it may be applied to numerous other analytes if appropriate aptamers are available.
Schematic of a fluorometric assay based on the use of magnetic graphene oxide and DNase I. It was applied to the determination of patulin. DNase I was introduced for recycling amplification. The detection limit is about 13 times lower than that without using DNase I. Figure a contains poor quality of text in image. Otherwise, please provide replacement figure file.Thank you. I will provide the figure file.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 3
·2712-2728
·
IF 2.993
Hu Aibin,Yang Xiaofang,You Qingliang,Liu Yanyang,Wang Qunying,Liao Guiying,Wang Dongsheng
A novel magnetically hyper-cross-linked polymer (Fe 3 O 4 @HCP-NH 2 ) was prepared in this study, which combined the advantage of the amino-modified HCP-NH 2 and the magnetic Fe 3 O 4 nanoparticles. The Fe 3 O 4 @HCP-NH 2 composite has a high specific surface area (532.62 m 2 g −1 ), well-developed mesoporous (0.3786 cm 3 g −1 ) and good magnetic property. This Fe 3 O 4 @HCP-NH 2 composite exhibits excellent adsorption ability for tetracycline, and the maximum adsorption capacity calculated by Langmuir model at 298 K is up to 694 mg g −1 . The adsorption mechanisms could be attributed to the complexation interactions, hydrogen bonding and cation exchange, and the dominant interaction was the surface complexation which was elucidated by X-ray photoelectron spectroscopy analysis. In addition, the composite can be rapidly separated and maintains high adsorption performance after five regeneration cycles. More importantly, it can be used as a broad-spectrum and highly efficient adsorbent for organic contaminants including methyl orange, methylene blue, bisphenol A and 2,4-dichlorophenol removal from contaminated water. This work demonstrated that the Fe 3 O 4 @HCP-NH 2 composite would be the most promising candidates for application in the adsorption of organic pollutants.
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JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 22
·15418-15429
·
IF 2.993
Fu Jiawei,Guo Yu,Ma Wenwen,Fu Chen,Li Li,Wang Haiyu,Zhang Hong
The sandwich-type polyoxometalate-based TiO 2 nanofibres were prepared successfully by electrospinning combining with chemical reaction and employed in ultra-deep desulfurization. OTA–CoVW–TiO 2 nanofibres (OTA = CH 3 (CH 2 ) 17 (CH 3 ) 3 N, CoVW = [Co 4 (H 2 O) 2 (VW 9 O 34 ) 2 ] 10− ) confirmed the excellent desulfurization performance in extraction catalytic oxidative desulfurization system (ECODS). At 323 K, the 500 ppm DBT (dibenzothiophene) model oil was entirely removed within 20 min using 0.010 g 45 wt% OTA–CoVW–TiO 2 nanofibres as catalyst when O/S molar ratio was 4:1 and the dosage of model oil was 5 mL. The catalysts could be recycled and reused at least five times without remarkable decrease in catalytic activity. The desulfurization efficiencies for different substrates were shown as following order: DBT > 4,6-DMDBT (4,6-dimethyl-dibenzothiophene) > BT (benzothiophene). Moreover, the possible mechanism was also elucidated.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2018
·Vol. 25
·期 19
·19122-19133
·
IF 2.8
Ren Bin,Wang Tiecheng,Qu Guangzhou,Deng Fang,Liang Dongli,Yang Wenli,Liu Meishan
As a highly active photocatalyst, g-C 3 N 4 /TiO 2 heterojunction nanocomposites were in situ synthesized by simple ultrasonic mixing and calcination by using TiO 2 and melamine as precursors. The morphology and structure of the prepared photocatalysts were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, UV-Vis diffuse reflectance spectroscopy, and X-ray photoelectron spectroscopy. The photocatalytic activities of g-C 3 N 4 /TiO 2 nanocomposites to degrade Orange II (AO7) under visible light irradiation were evaluated. Results showed that the photocatalytic rate of the prepared g-C 3 N 4 /TiO 2 photocatalyst to degrade AO7 was about three times than that of pristine TiO 2 and g-C 3 N 4 . The g-C 3 N 4 /TiO 2 composite with a ratio of 1:4 had the highest degradation efficiency for AO7 solution. Its degradation efficiency under acidic conditions was significantly higher than that under alkaline conditions. The enhancement of photocatalytic activity can be attributed to the formation of heterojunctions between g-C 3 N 4 and TiO 2 , which leads to rapid charge transfer and the efficient separation of photogenerated electron-hole pairs. The recycling experiment indicated that the photocatalyst of g-C 3 N 4 /TiO 2 nanocomposites still maintained good photochemical stability and recyclability after five cycles; this finding was important for its practical applications. A series of free radical trapping experiments showed that •O 2 − played a crucial role in the degradation of AO7.
ᅟ
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 13
·11325-11335
·
IF 2.324
Yan Yinglin,Wei Yiqi,Li Qiaole,Shi Mangmang,Zhao Chao,Chen Liping,Fan Chaojiang,Yang Rong,Xu Yunhua
A series of banana peels derived porous carbon (BPPC) materials were fabricated by pyrolysis carbonization with different numbers of KOH activation. The Brunauer–Emmett–Teller tests indicated the number of activation effectively improves the specific surface area and pore volume of the BPPC. Amongst, the BPPC-2 (activated twice) possesses ultrahigh specific surface area (2044.57 m 2 g −1 ) and large pore volume (2.40 cm 3 g −1 ) on account of the improved hierarchical porous microstructure. After S loading process, the resultant C/S composites were introduced as cathode material in Li–S batteries. The S/BPPC-2 composite cathode exhibited a higher initial specific capacity (1481.54 mAh g −1 at 0.1 C) and a better reversible capacity (351 mAh g −1 after 300 cycles at 1 C) than those of others. It also exhibited excellent high rate performance even at 5 C. The enhanced electrochemical performances were ascribed to the improved specific surface area and larger pore volume of the BPPC-2, which effectively facilitated the intimate contact between sulfur and the conductive matrix, accommodating severe volume change. Besides, the micro/mesopores provided high adsorption power to inhibit the dissolution of polysulfides. This research suggested that the activation number played a key role in improving the electrochemical performance of composite cathode in Li–S batteries.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 18
·4311-4322
·
IF 3.307
Wu Si-Qi,Song Hui-Peng,Li Bin,Liu Run-Zhou,Yang Hua,He Ling,Li Ping
Development of fast and accurate methods to discover lead compounds for drug candidates is highly important. In this study, a reliable and effective post-column on-flow biochemical assay (POBA) was established to screen potent peroxidase inhibitors from complex chemical mixtures (e.g., natural product extracts). Multiple factors such as flow rate, organic phase, detection wavelength, and reaction coil were carefully investigated. To better understand the features of POBA, another emerging technology of ultrafiltration LC-MS was used for comparison. The result showed that POBA had advantages in saving time, avoiding false positives, and improving the accuracy. To illustrate the practicality of the method, Radix Salvia Miltiorrhizae, a traditional herb for cardiovascular disease treatment, was applied as the research objective. Finally, six compounds including tanshinol, protocatechuic aldehyde, salvianolic acid D, rosmarinic acid, lithospermic acid, and salvianolic acid B were determined as novel peroxidase inhibitors. Their bioactivities were validated by microplate-based assay, molecular docking, and pharmacophore modeling. This study demonstrates a great potential of POBA in the efficient and accurate discovery of drug candidates.
Compared with a classical method of ultrafiltration LC-MS, the newly developed method of on-flow bioassay shows advantages in saving time, avoiding false positives and improving the accuracy
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Journal of Central South University
·
2018
·Vol. 25
·期 4
·701-708
·
IF 0.761
Kong Qian,Bai Xiu-zhi,Lin Hui-ju,Li Hai-pu,Yang Zhao-guang
For the determination of salicylaldoxime in environmental water samples, a stable and rapid method with low detection was proposed and established, based on the liquid-liquid extraction-high performance liquid chromatography with ultraviolet detector. Parameters including extraction solvent, ionic strength, solution pH, and extraction pattern were discussed for the optimal quantification of salicylaldoxime-spiked water. When the described method was applied to four spiked water samples, the obtained average extraction recovery rate was found between 87%–107% and relative standard deviation was below 6%. At the same time, good linear relationships were observed for spiked water samples from 0.01 to 10 μg/mL ( R 2 =0.9993). In addition, the detection limit of salicylaldoxime was revealed between 0.003–0.008 μg/mL, which is two orders of magnitude lower than previously reported results. Thus, the presented method may be advantageous for the high-efficiency determination of salicylaldoxime in water samples.
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JOURNAL OF ELECTRONIC MATERIALS
·
2018
·Vol. 48
·期 2
·827-837
·
IF 1.566
Tan Yanfang,Lan Yuwei,Liu Jinling,Liang Chunfeng
A wide variety of methods including chromatography, chemiluminescence and spectrophotometry have been reported to detect hexavalent chromium. Recently, carbon quantum dots (CQDs) have gained increasing attention as effective probes for inorganic ions, organic molecules, and biomolecules. However, there are still some bottlenecks, such as raw materials being too expensive to obtain, the materials have a low quantum yield (QY), and the preparation process is not environmentally friendly. Here, we prepare a very strong fluorescent probe through a simple, rapid, and green one-pot hydrothermal method with blue emission (QY, 61.1%). The obtained CQDs exhibit good water solubility, low toxicity, and photostability. Moreover, the CQDs show good selectivity and sensitivity to hexavalent chromium (Cr(VI)) under neutral conditions, with a linear range of 1–100 μ M and a detection limit of 0.19 μ M. Meanwhile, this fluorescent probe has been successfully applied for the highly selective analysis of Cr(VI) in natural water samples, which demonstrated its potential in environmental field applications.
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Drug Delivery and Translational Research
·
2018
·Vol. 9
·期 1
·240-248
·
IF 3.395
Chen Hangping,Wu Biyuan,Zhang Minmin,Yang Peipei,Yang Beibei,Qin Wanbing,Wang Qingqing,Wen Xinguo,Chen Meiwan,Quan Guilan,Pan Xin,Wu Chuanbin
Microneedle arrays have emerged as an alternative method for transdermal drug delivery. Although micromolding using a centrifugation method is widely used to prepare microneedles in laboratory, few researchers were focused on manufacturing processes capable of facile scale-up. A novel female mold was initially designed in this study, namely double-penetration female mold (DPFM) with the pinpoints covered by waterproof breather membrane which was beneficial to reduce the influence of gas resistance and solution viscosity. In addition, DPFM-based positive-pressure microperfusion technique (PPPT) was proposed for the scale-up fabrication of dissolving microneedle arrays (DMNA). In this method, polymer solution and base solution were poured into the DPFM by pressure difference, followed by drying and demolding. The results of optimal microscopy and SEM revealed that the obtained microneedles were uniformly distributed conical-shaped needles. The skin penetration test showed that DMNA prepared using PPPT were able to penetrate the rat skin with a high penetration rate. To realize the transition of microneedles fabrication from laboratory to industry, an automatic equipment was further designed in this study. Different from micromolding method using centrifugation, the equipment based on PPPT and DPFM has superiorities in the scale-up fabrication of microneedles in a highly effective, controllable, and scalable way.
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Food Analytical Methods
·
2018
·Vol. 12
·期 1
·271-281
·
IF 2.245
Chen Xue-Lei,Ai Lian-Feng,Cao Ya-Qing,Nian Qi-Xun,Jia Ye-Qing,Hao Yu-Lan,Wang Man-Man,Wang Xue-Sheng
A graphene oxide-incorporated monolithic column was fabricated and developed as an on-line solid-phase extraction sorbent coupled with LC-MS/MS for the automatic and fast determination of 16 sulfonamides in chicken muscle and milk samples. The proposed hybrid sorbent was easily produced from graphene oxide and a single crosslinker of ethylene glycol dimethacrylate. It gave favorable properties including uniformer structure, larger specific surface area, and enhanced column efficiency compared to the neat polymer monolith. Loading and eluting solutions affecting the on-line SPE were studied in detail. Under the optimized conditions, the on-line solid phase extraction coupled with LC-MS/MS method was achieved in 23 min. The developed method exhibited good linearity in the range of 1–100 μg/kg for sulfonamides in milk samples, and 2–200 μg/kg in chicken muscle samples, with r ranging from 0.993 to 0.999. The detection limits ( S / N = 3) were 0.3 μg/kg in milk and 0.6 μg/kg in chicken muscle. The spiked recoveries were in the range of 70.3–98.5% and 79.0–108.0%, with a precision of 5.19–9.37% and 4.04–8.57%, respectively. Furthermore, the graphene oxide-incorporated monolithic sorbent allowed more than 450 extraction cycles without any loss in the extraction efficiency. The developed method was successfully applied for the determination of 16 sulfonamides in milk and chicken muscle samples.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 17
·15241-15248
·
IF 2.324
Ma Xiaochun,Liu Yanjun,Liu Han,Xu Bin,Zhou Jing,Xiao Fan
In this study, the microencapsulated phase change material with paraffin as core and inorganic TiO 2 shell was successfully synthesized by in situ hydrolysis and polycondensation of tetrabutyl titanate in a nonaqueous oil-in-water emulsion using formamide as aqueous phase. The chemical compositions, crystalline structure, morphology and microstructure of paraffin@TiO 2 microcapsules were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffractometer (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The thermal properties and thermal stability of the microcapsules were measured by differential scanning calorimeter (DSC) and thermo-gravimetric analyzer (TGA). FT-IR and XRD results proved that there was no chemical reaction between paraffin core and TiO 2 shell material. SEM images indicated that the paraffin@TiO 2 microcapsules showed a regular spherical shape with the average diameters of 2–5 µm with a smooth shell. SEM and TEM studies also confirmed the paraffin was fully encapsulated with TiO 2 . DSC analysis indicated that the microcapsules had similar phase change behaviors as those of pure paraffin. Typical sample froze at 52.24 °C with a latent heat of 110.42 J g −1 and melt at 60.41 °C with a latent heat of 107.54 J g −1 , of which the encapsulation ratio achieved to 54.58%. TGA results indicated the thermal stability of paraffin was improved by the protection of TiO 2 shell through the encapsulation.
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危险品化学品经营许可证（带存储）