Advanced Composites and Hybrid Materials
·
2021
·Vol. 4
·期 3
·562-573
·
IF 5.693
Cheng Xi Quan,Li Songwei,Bao Hongfei,Yang Xiaobin,Li Zhixing,Zhang Yingjie,Wang Kai,Ma Jun,Ullah Asmat,Shao Lu
The lack of highly permeable and selective separation membranes hampers the application of the energy-efficient membrane separation process for water remediation and CO 2 capture in molecular scale. Nanoparticles have been widely applied for tailoring pore structures and surface properties of the molecular separation membranes, thereby enhancing separation performance. However, limited by non-ideal nanoparticle aggregation, it remains a big challenge to fabricate such membranes on a large scale. Herein, we designed a kind of highly dispersed nanoparticles through grafting poly(sodium-p-styrenesulfonate) (PSS) on metal organic frameworks UiO-66 and deployed them for tailoring structure of polyelectrolyte membrane (PEM) for water remediation and Pebax (PEBA) symmetrical membranes for CO 2 capture, respectively. Because of electrostatic interaction, the PSS-grafted-UiO-66 (UiO-66-PSS) demonstrated nearly 100% dispersion in water and had an average particle size around 200 nm. Most interestingly, the introduction of the UiO-66-PSS finely tailored the affinity between membranes and target molecules, and the molecular structure of both PEM and PEBA membranes, thereby tripling the permeances of the membranes and slightly improving the selectivity of the membranes meanwhile. The PEM/UiO-66-PSS membranes demonstrated pure water permeance as high as 27.3 L m −2 h −1 bar −1 with MgSO 4 rejection above 98.7%. For CO 2 capture, the PEBA/UiO-66-PSS membranes exhibited 414.5 barrer with selectivity about 53.8. Taken together, the highly dispersed UiO-66-PSS shows strong promise in constructing molecular separation membranes with high separation performance for environmental remediation. Graphical abstract The highly dispersed PSS-grafted-UiO-66 finely tailored membrane structures of PEM membranes and the PEBA membranes and enhanced affinity between the target molecules and the aforementioned membranes, thereby tripling membrane permeances and improving the membrane selectivity slightly. The obtained PEM/UiO-66-PSS membranes and PEBA/UiO-66-PSS membranes show strong promise in water remediation and CO 2 capture, respectively.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 5
·1-9
·
IF 5.833
Zhang Wenxian,Li Xiuping,Cui Tianyu,Li Shenchang,Qian Yuqing,Yue Yu,Zhong Wenying,Xu Bo,Yue Wanqing
Using an ultrasonication-assisted liquid exfoliation method, we have synthesized PtS 2 nanosheets with good reproducibility. Herein, intrinsic peroxidase-like activity was for the first time demonstrated for PtS 2 nanosheets, which can catalyze H 2 O 2 oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to generate a colored solution. The catalytic mechanism of PtS 2 nanosheets was investigated, which indicated that acceleration of the electron transfer between TMB and H 2 O 2 was the main reason for the peroxidase-like activity of PtS 2 nanosheets. Based on these observations, we exploited PtS 2 nanosheets integrated into dopamine-functionalized hyaluronic acid (HA-DA) hydrogel microspheres by droplet microfluidics to construct PtS 2 nanosheet– and PtS 2 @HA-DA microsphere–based sensors for highly sensitive determination of H 2 O 2 . When coupled with glucose oxidase, we further developed two glucose sensors based on the above two methods. Among them, the linearity of the PtS 2 nanosheet–based spectrophotometry was in the range of 0.5 to 150 μM and the limit of detection as low as 0.20 μM. The linearity of the microsphere-based colorimetry was in the range 200 to 12,000 μM with a detection limit of 29.95 μM. Both of the glucose sensors can be applied to the determination of glucose in human serum with reliable results and reproducibility. Graphical abstract
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高影响因子
IONICS
·
2021
·Vol. 27
·期 10
·4461-4471
·
IF 2.817
Zeng Depeng,Shu Dong,Yi Fenyun,Gao Aimei
A nest-like N-doped hierarchical porous active carbon (N-HAC) with higher specific surface area is achieved successfully by melamine cyanurate (MCA) sacrifice template molding and assistant chemical activation of NH 4 Cl and CaCl 2 . The results testify that the nest-like hierarchical porous character of N-HAC can form an interconnecting structure and introduce plenty of supercapacitor reactive sites, which can facilitate the ion diffusion/migration among the material, while nitrogen doping in N-HAC can change the charge distribution of N-HAC and then promote the electron transfer. Attributing to the synergistic effect of the hierarchical porous structure and nitrogen doping, N-HAC800 displays the highest specific capacitance (284.6 F g −1 at 1 A g −1 and 183.1 F g −1 even at 20 A g −1 ) and superior cycle stability (80.4% after 5000 cycles at 100 mV s −1 ). This study results prove that the N-doped hierarchical porous active carbon is a promising material for energy storage application in the future.
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Reproductive Biology and Endocrinology
·
2021
·Vol. 19
·期 1
·1-11
·
IF 5.211
Xu Haopeng,Xia Yi,Qin Juan,Xu Jie,Li Chongyan,Wang Yan
Background Premature ovarian failure (POF) is a common disease in the field of Gynecology. Low intensity pulsed ultrasound (LIPUS) can promote tissue repair and improve function. This study was performed to determine the effects of LIPUS on granulosa cells (GCs) apoptosis and protein expression of B-cell lymphoma-2 (Bcl-2) and BCL2-Associated X (Bax) in 4-vinylcyclohexene diepoxide (VCD)-induced POF mice and investigate the mechanisms of LIPUS on ovarian function and reserve capacity.Methods The current POF mice model was administrated with VCD (160 mg/kg) by intraperitoneal injection for 15 consecutive days. The mice were divided into the POF group, LIPUS group and control group. In the LIPUS group, the right ovary of mice was treated by LIPUS (acoustic intensity was 200 mW/cm2, frequency was 0.3 MHz, and duty cycle was 20%) for 20 min, 15 consecutive days from day 16. The mice of the POF group and control group were treated without ultrasonic output. The basic observation and body weight were recorded. Hematoxylin and eosin staining (H&E staining) and enzyme-linked immunosorbent assay (ELISA) were applied to detect ovarian follicle development, ovarian morphology and sex hormone secretion. Ovarian GCs apoptosis was detected by TUNEL assay and immunohistochemistry.Results The results showed that VCD can induce estrus cycle disorder, follicular atresia, sex hormone secretion decreased and GCs apoptosis in mice to establish POF model successfully. LIPUS significantly promoted follicular development, increased sex hormone secretion, inhibited excessive follicular atresia and GCs apoptosis. The mechanism might be achieved by increasing the protein expression of Bcl-2 and decreasing the expression of Bax in ovaries.Conclusion sLIPUS can improve the POF induced by VCD. These findings have the potential to provide novel methodological foundation for the future research, which help treat POF patients in the clinic.
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高影响因子
POLYMER BULLETIN
·
2021
·Vol. 79
·期 8
·6073-6086
·
IF 2.87
Wang Jinyuan,Hu Haibo,Jin Jie,Cui Yanjun,Tang Jinsong
Aliphatic polycarbonates derived from carbon dioxide and epoxides are drawing increasing attention from both academic and industrial researchers due to their biodegradability and partially renewable raw material resource. Of all the aliphatic polycarbonates investigated, poly(cyclohexene carbonate) (PCHC) is recognized as highly potential candidates thanks to its high glass transition temperature ( T g ) which can bridge the shortcomings of commercialized biodegradable materials. Meanwhile, polymers with high T g require higher processing temperature during compounding and subsequent casting in mold. It is therefore necessary to investigate the property changes of PCHC during its multiple thermal processing. In this work, the effect of several thermal stabilizers on the thermal stability and mechanical properties of PCHC was studied. The results showed that end-capping by maleic anhydride is the best approach to improve the thermal stability and to maintain the mechanical properties of PCHC. The possible mechanism for improving the thermal stability of PCHC was further analyzed by Py-GC/MS and 1 H NMR. Partial in situ end-capping of PCHC could mitigate the back-biting reaction at elevated temperature and consequently improved the thermal stability.
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高影响因子
ARCHIVES OF VIROLOGY
·
2021
·Vol. 166
·期 9
·2443-2450
·
IF 2.574
Cui Zhanding,Wang Qian,Li Dengliang,Zhao Shihui,Zhang Qian,Tan Yuxin,Gong Qianwen,Liu Ting,Shao Jiang,Zhang Shuang,Huang Hailong,Wang Junzheng,Pei Zhihua,Dong Hao,Wang Kai,Hu Guixue,Li Zhiyong
Cats infected with feline calicivirus (FCV) often display oral ulcers and inflammation of the upper respiratory tract, which can lead to death in severe cases. Antiviral therapy is one of the most effective ways to control FCV infection. Natural compounds in Chinese herbal medicines and medicinal plants provide abundant resources for research on antiviral drugs. In this study, we found that icariin (ICA), formononetin (FMN) and caffeic acid phenethyl ester (CPAE) show low cytotoxicity towards F81 cells, that the three natural compounds have apparent antiviral effects on FCV in vitro , and that they can inhibit different FCV strains. Then, we found that ICA and FMN mainly function in the early stage of FCV infection, while CAPE can function in both the early and late stages of FCV infection. Finally, we found that ICA has an antagonistic effect on FMN and CAPE in FCV infection, and FMN has a synergistic effect with CAPE against FCV infection. Our results showed that ICA, FMN and CAPE may be potential drug candidates for FCV-induced diseases.
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PubMed
高影响因子
Journal of Food Measurement and Characterization
·
2021
·Vol. 15
·期 5
·4623-4634
·
IF 2.431
Zhou Jia-Min,Shi Mei-Jia,Wei Xiao-Yi,Zhou Tao
In order to improve the biological activities of polysaccharides from Enteromorpha prolifra (EP), the crude EP was degraded in the presence of pectinase and glucoamylase. The reaction conditions for the hydrolysis of EP were optimized as: hydrolysis temperature 45.2 °C, total enzyme concentration 48.5 U/mL, with an activity ratio of pectinase to glucoamylase 3.4:1, pH 4.5, degradation time 3 h. In vitro antioxidant activity of the enzymatic degraded polysaccharides from E. prolifra (EEP) obtained under the optimal conditions was significantly improved when compared to that of EP. The IC 50 values of EEP to scavenge DPPH, hydroxyl and superoxide anion radicals were found to be 3.31, 3.02 and 3.90 mg/mL, respectively, while those values for EP were 19.57, 5.96 and 5.51 mg/mL, respectively. At 5 mg/mL, the ferric iron reducing power of EEP was 1.41 times higher than that of EP; the ferrous chelating ability of EEP was 89.6%, being much than that of EP (54.9%). Furthermore, EEP was found to have stronger tyrosinase inhibitory effects than EP. At 3.0 mg/mL, the inhibition rates of EEP on monophenolase and diphenolase activity of mushroom tyrosinase were measured as 32.7% and 39.1%, respectively, while those values for EP were 16.3% and 21.1%, respectively. The inhibition of EEP on diphenolase activity of mushroom tyrosinase was reversible and of competitive-uncompetitive mixed-type. EEP prepared in this study may find application in food industry and cosmetics.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 19
·4855-4863
·
IF 4.157
Ren Le,Qi Shuo,Khan Imran Mahmood,Wu Shijia,Duan Nuo,Wang Zhouping
Acyclic guanosine analogues, a class of widely used antiviral drugs, can cause chronic toxicity and virus resistance. Therefore, it is essential to establish rapid and accurate methods to detect acyclic guanosine analogues. In this study, five acyclic guanosine analogues (acyclovir, famciclovir, ganciclovir, penciclovir, and valaciclovir) were used as positive targets to obtain broad-spectrum aptamers through Capture-SELEX technology. Real-time quantitative PCR (Q-PCR) was used to monitor the aptamer SELEX process. After the sixteen rounds of selection against mixed targets, sequences were obtained by high-throughput sequencing (HTS). Furthermore, a broad-spectrum aptamer, named CIV6, was found as the higher performance aptamer that was suitable for five acyclic guanosine analogues by graphene oxide (GO) polarization and fluorescence assay. Finally, the aptamer CIV6 was used to construct GO fluorescence assay to detect five acyclic guanosine analogues. The limits of detection (LOD) of acyclovir, famciclovir, ganciclovir, penciclovir, and valaciclovir were 0.48 ng·mL −1 , 0.53 ng·mL −1 , 0.50 ng·mL −1 , 0.56 ng·mL −1 , and 0.38 ng·mL −1 , respectively. Graphical abstract
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INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
·
2021
·Vol. 116
·期 7
·2373-2385
·
IF 3.226
Guan Jiju,Ding Yunpeng,Gao Chao,Xu Zhengya,Xu Xuefeng,Wang Zhiliang
In this work, novel DPS/MWCNT composites were synthesized through filling multi-walled carbon nanotubes (MWCNTs) with dialkyl pentasulfide (DPS) using a wet-chemical method. A nanofluid that use the DPS/MWCNT composites as additives was then developed for achieving a high-performance turning. The performance of the developed nanofluid including dispersion stability, heat transfer capacity, and wettability was evaluated using thermophysical analytical methods. The machining performance of the DPS/MWCNT composites nanofluid was systematically investigated in the turning of AISI 52100 alloy steel, using a commercial emulsion coolant as a benchmark. The lubrication mechanism of the nanofluid involved in the turning process was reveal with the aid of X-ray photoelectron spectroscopy (XPS). The results showed that DPS was successfully filled into MWCNTs with a filling rate of around 25.7%. The nanofluid had an excellent dispersion performance and produced respective 105.0% and 23.6% improvements in the heat transfer and wetting performance, in comparison to a base fluid. During turning, the composites suspended in the nanofluid acted as microbearings to reduce the friction of sliding, while the DPS filled in the MWCNTs was released under pressure to generate a complex lubricating film at the tool-chip interface, leading to a low resistance to cutting. This thus resulted in 15% and 25% reductions in the cutting force and temperature as well as 16% and 22% improvements in the surface roughness and tool life, in comparison to a conventional turning.
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高影响因子
CATALYSIS LETTERS
·
2021
·Vol. 151
·期 11
·3135-3144
·
IF 3.186
Sun Zijun,He Xiong,Liu Jinghua,Liu Baosheng,Li Hongda,Jia Xiaobo,Yu Zhiqiang,Chang Haixin
Abstract Hematite (α-Fe 2 O 3 ) is a potential photoanode material for photoelectrochemical (PEC) water splitting, but its short hole diffusion length and low water oxidation kinetics prevent its practical application. In general, the hole transport rate and the water oxidation kinetics could be improved by modifying the oxygen evolution cocatalysts (OECs) in the proper way. In this work, we designed and synthesized a bimetallic phosphides NiCoP nanoparticles (NPs) modified (Ti, Zr)-codoped hematite photoanode (TZ-H) by a facile spin coating method to achieve the uniform and close interface contact of semiconductor/OECs. Under the optimal conditions, the as-prepared photoanode exhibits high and stable PEC performance with a current density of 2.38 mA/cm 2 at 1.23 V vs. RHE, which is one of the best performances of noble-metal-free hematite-based photoanodes for water oxidation. Moreover, the surface efficiency of charge separation is improved by NiCoP modification, which is increased from 59% to 91% at 1.23 V vs. RHE and reached nearly 99% at higher potential. This work not only proves that NiCoP NPs are outstanding OECs but also provides a new strategy for the design of noble-metal-free semiconductor/OECs photoanodes with high-quality interface contact. Graphic Abstract
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-8
·
IF 4.38
Guo Zhenlong,Su YiFei,Li Kexin,Tang MengYi,Li Qiang,Xu Shandong
The development of detecting residual level of abamectin B 1 in apples is of great importance to public health. Herein, we synthesized a octopus-like azobenzene fluorescent probe 1,3,5-tris (5′-[( E )-( p -phenoxyazo) diazenyl)] benzene-1,3-dicarboxylic acid) benzene (TPB) for preliminary detection of abamectin B 1 in apples. The TPB molecule has been characterized by ultraviolet–visible absorption spectrometry, 1 H-nuclear magnetic resonance, fourier-transform infrared (FT-IR), electrospray ionization mass spectroscopy (ESI-MS) and fluorescent spectra. A proper determination condition was optimized, with limit of detection and limit of quantification of 1.3 µg L −1 and 4.4 μg L −1 , respectively. The mechanism of this probe to identify abamectin B 1 was illustrated in terms of undergoing aromatic nucleophilic substitution, by comparing fluorescence changes, FT-IR and ESI-MS. Furthermore, a facile quantitative detection of the residual abamectin B 1 in apples was achieved. Good reproducibility was present based on relative standard deviation of 2.2%. Six carboxyl recognition sites, three azo groups and unique fluorescence signal towards abamectin B 1 of this fluorescent probe demonstrated reasonable sensitivity, specificity and selectivity. The results indicate that the octopus-like azobenzene fluorescent probe can be expected to be reliable for evaluating abamectin B 1 in agricultural foods.
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高影响因子
WATER AIR AND SOIL POLLUTION
·
2021
·Vol. 232
·期 3
·1-14
·
IF 2.52
Pan Yuwei,Bu Zhuoyu,Li Xiang,Han Jiangang
This study presented the efficient removal of tartrazine, a typical biorefractory dye, in a heterogeneous photochemical Fenton-like system adopting Fe 0 and oxalate (Ox) (UV/Fe 0 /Ox). Only 47.4% tartrazine could be removed within 60 min with a UV/Fe 0 system. The addition of Ox could significantly enhance the removal of tartrazine to 72.4% within only 20 min with the UV/Fe 0 /Ox system. The effects of various factors, such as the Fe 0 dose (0–0.8 g/L), Ox dose (0–2 mM), initial pH (2–6), and initial tartrazine concentration (2–30 mg/L), on the removal of tartrazine were examined. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and Mossbauer spectroscopy were conducted to explore the mechanism by which oxalate enhances the performance of the UV/Fe 0 system. Ox could inhibit the formation of iron (hydro)xides on the Fe 0 surface, thus guaranteeing the reactivity of Fe 0 during the reaction. Compared with Fe 2 O 3 , FeS, and Fe 3 O 4 , Fe 0 was a good heterogeneous iron catalyst for the photolysis of tartrazine with the Ox system. Compared with H 3 PO 4 , nitrilotriacetic acid, and ethylenediaminetetraacetic acid, Ox was also a good photolysis chelating agent. The UV/Fe 0 /Ox system could also maintain fast tartrazine removal after five consecutive runs without the addition of Fe 0 , indicating the good stability of Fe 0 .
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