Scientific Reports
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2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Li Chen,Wang Lijie,Yuan Min,Xu Hong,Dong Jinxiang
Here, we bridge the gap between carbon mineralization and laundry detergent builder with sodium oxalate. Daily laundry can help mineralize carbon dioxide. First, we screen an environment-friendly process to produce sodium oxalate, using CO 2 as a raw material. Then, we evaluate the properties of sodium oxalate as a detergent builder and prove the formation of calcium oxalate under laundry conditions. Our data suggest that sodium oxalate has excellent calcium-removing properties. Detergents based on sodium oxalate have good detergency. Furthermore, solid calcium oxalates (calcium oxalate monohydrate or calcium oxalate dihydrate, which has good stability in water and thermal stability), is obtained from washing waters. These results demonstrate the possibility of using sodium oxalate as detergent builder. The whole process can transform the greenhouse gas CO 2 into commodity chemicals and can mineralize carbon.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 10
·1-9
·
IF 5.479
Yi Haoyang,Yan Zhiyu,Wang Lumei,Zhou Xiaotong,Yan Rui,Zhang Dongwei,Shen Guoqing,Zhou Shanshan
A fluorometric method is described for the determination of ofloxacin (OFL). It is based on the use of the fluorescent intercalator SYBR Green I (SG-I). The OFL-aptamer has G-quadruplex structures and can be recognized by SG-I. It results in strong fluorescence of SG-I. If OFL is present, OFL will bind to its aptamer to form stable complexes. This induces the despiralization of partial dsDNA regions, leads to changes in the structure of the aptamer. Thus, SG-I is released from the OFL-aptamer into solution. Hence, the fluorescence of SG-I drops. Fluorescence decreases linearly in the 1.1 to 200 nM OFL concentration range, and the limit of detection is 0.34 nM. The method shows good selectivity to much interference including analogues, hormones, pesticides. It is also effortless and fast with the times of measurement of <40 min. In addition, good recoveries of 91.3–119.0% were found for tap water, river water and artificial urine spiked with OFL with relative standard deviation (RSD) of ≤11.6%.
A sensitive fluorometric method is developed for ofloxacin (OFL) detection in aqueous samples based on the fluorescence intensity change of SYBR Green I (SG-I) with or without OFL.
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Drug Delivery and Translational Research
·
2019
·Vol. 10
·期 1
·192-201
·
IF 3.111
Yang Dandan,Li Ruirui,Zhang Fang,Qin Li,Peng Feifei,Jiang Shanshan,He Huiyang,Lu Xiumei,Zhang Peng
The effervescent method, as a simple and effective technology to prepare nanosuspensions, has gained great attention. In this present research, loratadine (LTD) nanosuspensions were successfully prepared by the effervescent method using Soluplus as stabilizer to improve the bioavailability of LTD in vivo. The mean particle size was about 100 nm. And the LTD nanosuspensions were lyophilized for further study. The freeze-dried powders could be dissolved quickly, and the mean particle size remained almost unchanged after powders were re-dissolved. By transmission electron microscope (TEM), differential scanning calorimetry (DSC), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR) spectroscopy, and X-ray diffraction (X-RD), the characterizations of LTD nanosuspensions and freeze-dried powders were studied. Commercial tablets were used as the reference to investigate the dissolution behaviors in different release media and of bioavailability in vivo of LTD freeze-dried powders. The cumulative dissolution of the LTD freeze-dried powders was superior in different release media compared with commercial tables. In addition, for the evaluation of the bioavailability of LTD nanosuspensions, the LTD concentration in rat plasma was determined using LC-MS/MS method. The results showed that the AUC 0–24 and C max of LTD freeze-dried powders were about 2.14- and 2.01-fold higher than those of commercial tablets. In short, the effervescent method has been successfully applied to the preparation of LTD nanosuspensions to improve the bioavailability of LTD in vivo with the advantage of low energy consumption. This simple technology also provides an idea for the preparation of the other nanosuspensions.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2019
·Vol. 27
·期 7
·7025-7039
·
IF 2.914
Gao Boru,Wang Jin,Dou Mengmeng,Xu Ce,Huang Xue
In present study, an efficient ternary Ag/TiO 2 /mesoporous g-C 3 N 4 (M-g-C 3 N 4 ) photocatalyst was successfully synthesized through depositing Ag nanoparticles (NPs) on the surface of TiO 2 /M-g-C 3 N 4 heterojunction. Ag/TiO 2 /M-g-C 3 N 4 nanocomposite displayed the highest degradation efficiency for amoxicillin (AMX) compared to TiO 2 /M-g-C 3 N 4 heterojunction, M-g-C 3 N 4 , and bulk-g-C 3 N 4 (B-g-C 3 N 4 ). The removal efficiency of AMX in real situation, surface water (SW), hospital wastewater (HW), and waste water treatment plant (WWTP) also were studied to illustrate the effectiveness of Ag/TiO 2 /M-g-C 3 N 4 photocatalysts. The vulnerable atoms in AMX structure were revealed through DFT calculation. Additionally, the dominating active groups produced in time of the photocatalytic procedure were determined on account of free radical trapping experiments and ESR spectra. The mechanism of photocatalytic degradation was proposed and verified. The transfer of the electrons and the inhibition of the recombination of photogenerated electron-holes were enhanced effectively under the synergistic effect of the Ag NPs and TiO 2 . As a consequence, the catalytic activity of the composite was improved under visible light.
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Nature Biomedical Engineering
·
2019
·Vol. 4
·期 2
·159-171
·
IF 17.135
Wang Liyuan,Xie Songlin,Wang Zhiyuan,Liu Fei,Yang Yifan,Tang Chengqiang,Wu Xiaoying,Liu Peng,Li Yongjing,Saiyin Hexige,Zheng Shuang,Sun Xuemei,Xu Fan,Yu Hongbo,Peng Huisheng
Mechanical mismatches between implanted electronics and biological tissues can lead to inaccurate readings and long-term tissue damage. Here, we show that functionalized multi-walled carbon nanotubes twisted into helical fibre bundles that mimic the hierarchical structure of muscle can monitor multiple disease biomarkers in vivo. The flexible fibre bundles are injectable, have a low bending stiffness and display ultralow stress under compression. As proof-of-concept evidence of the sensing capabilities of these fibre bundles, we show that the fibre bundles enable the spatially resolved and real-time monitoring of H 2 O 2 when implanted in tumours in mice, and that they can be integrated with a wireless transmission system on an adhesive skin patch to monitor calcium ions and glucose in the venous blood of cats for 28 d. The versatility of the helical fibre bundles as chemically functionalized electrochemical sensors makes them suitable for multiple sensing applications in biomedicine and healthcare.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-8
·
IF 5.479
Hu Xiaopeng,Xi Jiajia,Xia Yuanyuan,Zhao Faqiong,Zeng Baizhao
A space-confined synthesis method is employed for the preparation of a single-layer MoS 2 –boron doped ordered mesoporous carbon nanocomposite. A phenol-formaldehyde resin is used as carbon source to create a confined space for the formation of single-layer MoS 2 . The addition of pluronic F127, as a soft template, suppresses the stacking of MoS 2 layers and makes the composite porous. The nanocomposite is characterized by scanning electron and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy. The single-layer MoS 2 sheets have a lateral size of about 5 nm and are uniformly embedded in the composite. They possess numerous active edge sites and display a strong synergistic effect with other components. The composite is modified on a glassy carbon electrode, followed by the electrochemical imprinting of theophylline, and the resulting electrode exhibits good electrochemical response to theophylline. The linear response range is 0.01–250 μM by differential pulse voltammetry, and the lower detection limit is 5 nM. It has been successfully applied to the determination of theophylline in spiked tea drink samples.
Single-layer MoS 2 –boron doped ordered mesoporous carbon nanocomposite has large surface area and high catalysis, when coupling with molecularly imprinted polymer the resulting electrode shows highly sensitive and selective response to theophylline.
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Frontiers of Chemical Science and Engineering
·
2020
·Vol. 14
·期 5
·813-823
·
IF 3.552
Wang Mengyun,Zhang Shengbo,Li Mei,Han Aiguo,Zhu Xinli,Ge Qingfeng,Han Jinyu,Wang Hua
Novel, hierarchical, flower-like Ag/Cu 2 O and Au/Cu 2 O nanostructures were successfully fabricated and applied as efficient electrocatalysts for the electrochemical reduction of CO 2 . Cu 2 O nanospheres with a uniform size of ∼180 nm were initially synthesized. Thereafter, Cu 2 O was used as a sacrificial template to prepare a series of Ag/Cu2O composites through galvanic replacement. By varying the Ag/Cu atomic ratio, Ag 0.125 /Cu 2 O, having a hierarchical, flower-like nanostructure with intersecting Ag nanoflakes encompassing an inner Cu 2 O sphere, was prepared. The as-prepared Ag x /Cu 2 O samples presented higher Faradaic efficiencies (FE) for CO and relatively suppressed H 2 evolution than the parent Cu 2 O nanospheres due to the combination of Ag with Cu 2 O in the former. Notably, the highest CO evolution rate was achieved with Ag 0.125 /Cu 2 O due to the larger electroactive surface area furnished by the hierarchical structure. The same hierarchical flower-like structure was also obtained for the Au 0.6 /Cu 2 O composite, where the FE CO (10%) was even higher than that of Ag 0.125 /Cu 2 O. Importantly, the results reveal that Ag 0.125 /Cu 2 O and Au 0.6 /Cu 2 O both exhibit remarkably improved stability relative to Cu 2 O. This study presents a facile method of developing hierarchical metal-oxide composites as efficient and stable electrocatalysts for the electrochemical reduction of CO 2 .
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CHROMATOGRAPHIA
·
2019
·Vol. 83
·期 2
·305-310
·
IF 1.552
Zhang Chaozheng,Fan Longxing,Zhao Hua
Abstract An increasing number of researchers are focusing on short-chain fatty acids (SCFAs), which are closely related to various aspects of the human body. This study presented a pretreatment method for mouse feces that combined acidification and extraction. Then, a direct injection process into gas chromatography was developed. The limits of detection using this method are 0.5–0.8 mg L −1 , and the corresponding sample contents are 0.015–0.024 mg g −1 . The limits of quantification are 0.8–1.0 mg L −1 , and the corresponding sample contents are 0.024–0.030 mg g −1 . The linear relationship of the calibration curve is good and has a correlation coefficient of > 0.999. The recovery rate of the spiked standard is 80–102%. This method had been successfully applied to analysing and determining SCFAs in biological samples. Graphic Abstract
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 11
·1-9
·
IF 5.479
Zhen Deshuai,Jiang Ning,Geng Hongchao,Qiao Yan,Liu Yu,Zhu Xingqi,Gao Chan,Grimes Craig A.,Cai Qingyun
Cobalt-doped nanoporous carbon (Co-NPC) with dodecahedral shape was pyrolytically synthesized and applied as a sorbent and matrix for the enrichment and analysis of small molecules by surface-assisted laser desorption/ionization time-of-flight mass spectrometry (SALDI-TOF MS). Extremely low detection limits were accomplished for cetyltrimethylammonium bromide (1 fg·mL −1 ), and Rhodamine B (1 fg·mL −1 ) in water, and Malachite Green and its metabolite in fish blood and fish extracts (pg·mL −1 concentrations).
Schematic representation of cobalt-doped nanoporous carbons (Co-NPCs) applied as SALDI matrix for analysis of toxic contaminants in fish and receipt papers. The Co-NPCs have a high desorption/ionization efficiency and low limit of detection.
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BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 6
·802-807
·
IF 1.65
Du Jingjing,Guo Ruilin,Li Ke,Ma Bingbing,Chen Yan,Lv Yanna
In this work, we assessed the toxic effects of ZnO nanoparticles (NPs; 1, 10, and 50 mg L −1 ) and the corresponding dissoluble Zn ions (0.71, 8.66, and 35.59 mg L −1 ) on Microcystis aeruginosa . After chronic exposure (28 days), significantly higher growth inhibition was observed under ZnO NPs at 1 mg L −1 (47%) than under Zn ions at 0.71 mg L −1 (−15%). The opposite effect pattern was observed for ZnO NPs at 10 (71% vs. 80%) and 50 mg L −1 (73% vs. 95%) compared to Zn ions at the corresponding concentrations. After 7 days of exposure, ZnO NPs at 10 and 50 mg L −1 led to an increase of 83 and 53% in malondialdehyde content, as well as an increase of 106 and 61% in superoxide dismutase activity, respectively. However, Zn ions at the corresponding concentrations showed negligible impacts on the two parameters. The different results indicate that the insoluble NPs during the initial exposure mostly account for lipid peroxidation, which further lead to microalgal antioxidant response. During the subsequent exposure, the contributors of ZnO NP toxicity shift with the concentration and exposure time of ZnO NPs. In conclusion, the study presents new insights into the different contributions of insoluble NPs and dissoluble metallic ions to metallic NP toxicity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 20
·18802-18810
·
IF 2.195
Zhao Ke,Xu Ting,Cao Jian,Yang Lili,Wei Maobin,Fan Hougang,Liu Huilian,Liu Chengyou,Liu Xiaoyan
Carbon nanotubes-coated/filled by Fe 3 O 4 nanoparticles were successfully fabricated by a facile in-situ coprecipitation method at low temperature. The effects of the adding amounts of Carbon nanotubes (CNTs) on the morphology, structure, magnetic and adsorption properties of the nanocomposites were studied in detail. The XRD patterns showed that the sizes of Fe 3 O 4 nanoparticles in the nanocomposites could be well tuned from a few nanometers to a dozen nanometers. The SEM and TEM images revealed that different coverage density and composite mode had happened between CNTs and Fe 3 O 4 nanoparticles. All of the nanocomposites exhibited favorable superparamagnetic properties, and the saturation magnetization was affected by the average grain sizes and the loading amounts of Fe 3 O 4 nanoparticles. Strong magnetization and high dispersion of Fe 3 O 4 /CNTs nanocomposites implied the excellent adsorption capacity and recycle of nanocomposites in the practical application. The adsorption kinetics of methylene blue (MB) was well described by the pseudo-second-order kinetic model.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 31
·期 2
·1461-1471
·
IF 2.195
Zhou Bo,Cui Chunting,Ma Shenghua,Bai Jintao,Wang Hui
A novel Ag-doped glass frit is prepared by the sol-gel method. Nitrogen adsorption-desorption isotherms indicate that the frit has a large BET surface area and a small particle size which promotes front contact metallization. When the glass frit is used for the front contact electrode of polycrystalline silicon solar cells (pc-Si solar cells), it exhibits excellent wettability and etching results on the SiN x layer and the Si substrate. The pc-Si solar cells with the as-prepared frit has a better photoelectric conversion efficiency (18.2%) and is 0.8% higher than the solar cells using the conventional frit, which is due to the frit will produce a lot of Ag nanocrystals at the interface of the glass layer, promoting the formation of excellent ohmic contact between the Ag electrode and n-Si layer, and reducing the contact resistance of solar cells.
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