Frontiers of Optoelectronics
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2022
·Vol. 15
·期 1
·1-9
·
IF 0
Zhou Xingwei,Zhang Wei,Zhang Zunhao,Wang Zizhun,Zou Xu,Li Dabing,Zheng Weitao
The oriented two-dimensional porous nitrogen-doped carbon embedded with CoS 2 and MoS 2 nanosheets is a highly efficient bifunctional electrocatalyst. The hierarchical structure ensures fast mass transfer capacity in improving the electrocatalytic activity. And the greatly increased specific surface area is beneficial to expose more electrocatalytically active atoms. For oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) tests in 1 mol/L KOH solution, only 194 and 140 mV overpotential are required to achieve a current density of 10 mA/cm 2 , respectively. Our research provides an effective strategy for synergizing the individual components in nanostructures for a wide range of electrocatalytic reactions. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 48
·73353-73364
·
IF 5.19
Chen Jun,Zhu Layun,Cao Sisi,Song Zihui,Yang Xiaohong,Jin Jie,Chen Zhaoming
In the present study, the cyanobacterial char (ACC) prepared from Chaohu cyanobacteria was used as a nanoscale carrier for zero-valent iron (NZVI) to synthesize a highly efficient activation material designated as cyanobacterial char-supported nanoscale zero-valent iron (NZVI@ACC), which was subsequently used for activating peroxymonosulfate (PMS) to degrade the orange II (OII) dye. The XRD and XPS results revealed that NZVI was anchored onto the ACC through coordination bonding, forming a stable structure. The SEM and TEM observations revealed that the NZVI was embedded in the sheet structure of the ACC. The NZVI@ACC had a larger specific surface area (42.249 m 2 /g) and also magnetism, due to which its components could be separated through an externally applied magnetic field. Using this NZVI@ACC/PMS system, the rate of degradation of OII (100 mg/L) reached 98.32% within 14 min. The OII degradation reaction using the NZVI@ACC/PMS system followed first-order kinetics. The activation energy of this degradation reaction was 17.34 kJ/(mol·K). Quenching and EPR experiments revealed that various free radicals (SO 4 · − , ·OH) were produced, with SO 4 · − playing the major role in the reaction. The theoretical calculations revealed that SO 4 · − attacked the 12 (N) of OII, thereby destroying and degrading both azo and hydrogenated azo structures of OII. The presence of halogen ions in the actual dye-containing wastewater samples inhibited the OII degradation by the NZVI@ACC system to different degrees, and the inhibition effect followed the order I − > Br − > Cl − .
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Advanced Composites and Hybrid Materials
·
2022
·Vol. 5
·期 2
·1054-1066
·
IF 11.806
Zhang Zheng,Liu Mingxiang,Ibrahim Mohamed M.,Wu Haikun,Wu Yan,Li Yang,Mersal Gaber A. M.,El Azab Islam H.,El-Bahy Salah M.,Huang Mina,Jiang Yunxiao,Liang Gemeng,Xie Peitao,Liu Chunzhao
Epsilon-near-zero (ENZ) materials are promising candidates in the fields of sensing technologies, solar energy harvesting, and electromagnetic absorbers, and most research on ENZ materials is focused at visible, infrared, and terahertz wavelengths. However, the report about ENZ materials at radio frequency is rare. In this work, flexible polystyrene/graphene (PS/GR) metacomposites exhibiting ENZ properties at radio-frequency region were fabricated by solution mixing assisted with non-solvent induced phase separation (NIPS) strategy and the hot press method. The NIPS strategy greatly improved the dispersion and distribution of GR nanosheets in PS matrix, allowing GR nanosheets to disperse in PS solution without delamination within 72 h. The microstructure, crystalline structure, chemical composition, mechanical properties, and electrical and dielectric properties were investigated. When GR content reached 30 wt%, the continuous conductive GR network was formed, and the epsilon-near-zero at around 920 kHz accompanied by the transition of permittivity from positive to negative was observed, ascribing to the resonance of the induced electric dipoles from GR nanosheets’ surfaces. The equivalent circuit analysis showed that the appearance of inductors was significant for the realization of ENZ and negative permittivity. The flexible PS/GR composites with ENZ properties at radio frequency show great potentials in the fields of wearable materials such as invisibility cloak, drug delivery, and soft robotics. Graphical abstract Graphene nanocomposites are designed by solution mixing assisted with non-solvent induced phase separation, and showed epsilon-near-zero properties ( ε ′ ~ 0) and excellent flexible properties.
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Food Analytical Methods
·
2022
·Vol. 15
·期 10
·2725-2733
·
IF 3.498
Sun Luping,Liu Hongyan,Chi Bingqing,Bian Yifei,Zhou Honglei,Tian Zhenhua
Quince ( Cydonia oblonga Mill.) is the one and only specie of the genus Cydonia in the Rosacea family. Quince contains bioactive constituents such as alkaloids, saccharides, flavonoids, and volatile oils. Nevertheless, seldom researches have concentrated on quince essential oil (QEO). The chemical composition, cellular activity, antioxidant activity, and α-glucose inhibition activity of the plant were studied. QEO was isolated using hydrodistillation technique, and the yield was 1.3 mL/kg. A total of 52 chemical constituents in QEO were determined by gas chromatography-mass spectrometry (GC–MS). The main components (> 3.0%) found in the QEO were methyl (Z)-octadec-6-enoate (16.2%), methyl linoleate (10.0%), cedrenol (8.8%), methyl hexadecanoate (7.2%), methyl palmitoleate (7.2%), dibutyl phthalate (5.4%), hexadecanal (4.7%), 12,15-octadecatrienoicacid, ethylester, (Z,Z,Z)-9 (4.2%), α-eudesmol (3.5%), terpinen-4-ol (3.3%), and palmitic acid (3.2%). The antioxidant activity was determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging method. Then, the α-glucose inhibitory activity of the essential oil was analyzed. We investigated the effects of this plant on NO production and cell viability in H 2 O 2 –induced oxidative stress HUVCEs. The results showed that the QEO had significant antioxidant activity and α-glucose inhibitory effect. Furthermore, the results revealed that QEO could protect HUVECs from oxidative stress and effectively inhibited NO production in that condition. To summarize, the results of this study demonstrated the excellent cellular and antioxidant activity of QEO, and it has potential biological significance in the treatment of cardiovascular diseases.
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Scientific Reports
·
2022
·Vol. 12
·期 1
·1-15
·
IF 4.996
Dong Hao,Feng Chenjie,Cai Xiyunyi,Hao Yuanyuan,Gu Xinyue,Cai Lei,Wu Shuting,Chen Jiamin,Liu Zhou,Xie Wen,Lu Xuanren,Qian Hongfa,Liu Yulin,Cao Yiming,Zhu Junlin,Xu Jiayi,Zhou Yanjie,Ma Shuangyu,Yang Sha,Shi Yufeng,Yu Haojiang,Shi Minjie,Wang Yurong,Gu Harvest F.,Fan Lei,Wu Liang
7-Met, a derivative of soybean isoflavone, is a natural flavonoid compound that has been reported to have multiple signaling pathways regulation effects. This study investigated the therapeutic effects of 7-Met on mice with atopic dermatitis induced by fluorescein isothiocyanate (FITC), or oxazolone (OXZ). 7-Met ameliorated FITC or OXZ-induced atopic dermatitis symptoms by decreasing ear thickness, spleen index, mast cell activation, neutrophil infiltration and serum IgE levels in female BALB/c mice. In FITC-induced atopic dermatitis mice, 7-Met reduced Th1 cytokines production and regulated Th1/Th2 balance by downregulating the secretion of thymic stromal lymphopoietin (TSLP) via inactivation of the NF-κB pathway. In OXZ-induced atopic dermatitis, 7-Met functioned through the reduction of Th17 cytokine production. Our study showed that 7-Methoxyisoflavone alleviated atopic dermatitis by regulating multiple signaling pathways and downregulating chemokine production.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 47
·71721-71730
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IF 5.19
Huang Wenjun,Li Sichao,Wang Hongbin,Cui Peng,Xu Haomiao,Cheng Can,Qu Zan,Yan Naiqiang
Oxidation–reduction-absorption based on sulfite is a promising process for simultaneous removal of NO x and SO 2 . However, excessive oxidation of sulfite and competitive absorption between NO x and SO 2 limit its application. A matching strategy between antioxidants and alkaline agents has been proposed to solve these problems and enhance the absorption process. The comparison results of inhibitors showed that hydroquinone exhibited long-term high-efficiency inhibition of S(IV) (SO 3 2- /HSO 3 - ) oxidation. The comparison of alkaline agents showed that the Na 2 SO 3 solution with heterogeneous mixture of MgO and hydroquinone exhibited better absorption performance than that with other combinations. The absorption amounts of NO x in 0.15 mol/L Na 2 SO 3 50 mL solution added 0.1% hydroquinone (HQ) with 0.09 mol/L MgO were 2.24 mmol, which improved 5 times than that without additives. In addition, studies on the influence of pH showed that the pH of MgO mixture could be stabilized at 9–10 for a long time, while the pH of Na 2 CO 3 mixture decreased faster. Further studies suggested that the hydration of MgO resulted in the solution with MgO keeping high pH. This is also the main reason why the combination of MgO and hydroquinone is superior to the combination of Na 2 CO 3 and hydroquinone in desulfurization and denitration performance.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2022
·Vol. 414
·期 17
·4897-4907
·
IF 4.478
Yang Zhenglun,Chen Yihui,Jia Jianggang,Hou Chunyan,Xuan Rongrong,Wang Tingting
In the current study, the C18-modified halloysite was fabricated via silylation reaction and subsequently used as sorbent in matrix solid-phase dispersion (MSPD) for the extraction of bisphenol A and diethylstilbestrol from human placenta, followed by high-performance liquid chromatography-tandem mass spectrometry analysis. The as-prepared sorbent was characterized by scanning electron microscopy, energy-dispersive spectrometry, Fourier transform infrared spectroscopy, X-ray diffraction, and thermo-gravimetric analysis. Varied parameters such as methanol concentration in wash solvent, pH and salt concentration in elution solvent, elution volume, and mass ratio of sample to sorbent were optimized. The adsorption capacities of bisphenol A and diethylstilbestrol on the developed C18-modified halloysite were 6.3 and 14.2 mg g −1 , respectively, higher than those on the commercial C18 silica gel. Under the optimal condition, the average recoveries of bisphenol A and diethylstilbestrol by MSPD varied from 91.0 to 106.0%, and the relative standard deviations were less than 10.6% for human placenta samples. The limits of detection in the human placenta were 0.2 μg kg −1 for bisphenol A and diethylstilbestrol. The simple C18-modified halloysite-based MSPD method holds great potential for the determination of trace bisphenol A and diethylstilbestrol in the human placenta and other tissues of pregnant women with high sensitivity, accuracy, and reliability. Graphical abstract
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 39
·期 2
·290-295
·
IF 2.726
Qin Chang,Dong Jing,Xie Beibei,Wang Hongkun,Zhang Na,Zhao Chunhua,Qiao Congde,Liu Mingxia,Yang Xiaodeng,Li Tianduo
Poly(lactic-co-glycolic acid)(PLGA) is one of the most representative degradable copolymers and promising drug carriers. In the current paper, the PLGAs with a lactic acid/glycolic acid(LA/GA) molar ratio of 52/48 and various molecular weights were prepared by a melting method. The molecular weight, molecular weight distribution, and thermal stability were determined by 1 H NMR and thermogravimetric analysis methods. The results demonstrated that PLGAs with the fixed LA/GA molar ratio(52/48), different molecular weights, and narrow molecular weight distribution could be obtained by solely altering the reaction time. The PLGA films were prepared, and their properties including micro-structure, mechanical property, in-vitro cytotoxicity, and biodegradability were characterized. In combination with the homogeneous microstructures and mechanical properties, the drug-loading and releasing properties of PLGA 3.2 films were investigated. The results show that PLGA 3.2 film with an LA/GA molar ratio of 52/48 is a promising curcumin carrier.
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Nature Energy
·
2022
·Vol. 7
·期 9
·866-875
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IF 67.439
Zhai Shuo,Xie Heping,Cui Peng,Guan Daqin,Wang Jian,Zhao Siyuan,Chen Bin,Song Yufei,Shao Zongping,Ni Meng
Improved, highly active cathode materials are needed to promote the commercialization of ceramic fuel cell technology. However, the conventional trial-and-error process of material design, characterization and testing can make for a long and complex research cycle. Here we demonstrate an experimentally validated machine-learning-driven approach to accelerate the discovery of efficient oxygen reduction electrodes, where the ionic Lewis acid strength (ISA) is introduced as an effective physical descriptor for the oxygen reduction reaction activity of perovskite oxides. Four oxides, screened from 6,871 distinct perovskite compositions, are successfully synthesized and confirmed to have superior activity metrics. Experimental characterization reveals that decreased A-site and increased B-site ISAs in perovskite oxides considerably improve the surface exchange kinetics. Theoretical calculations indicate such improved activity is mainly attributed to the shift of electron pairs caused by polarization distribution of ISAs at sites A and B, which greatly reduces oxygen vacancy formation energy and migration barrier.
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RARE METALS
·
2022
·Vol. 41
·期 10
·3446-3455
·
IF 6.318
Wu Xin-Fei,Li Zi-Jian,Liu Jin-Xiao,Luo Wen,Gaumet Jean-Jacques,Mai Li-Qiang
Owing to adjustable microstructure and stable physiochemical properties, carbon-based materials are regarded as promising materials as anodes for potassium-ion batteries (PIBs). Building amorphous structure and introducing defects are favorable methods to generate active sites and improve the electrochemical performances of carbon-based materials. In this work, we develop a facile carbonization method to prepare sulfur-doped amorphous carbon microspheres with hierarchical structure and modulated defects concentration (S-CM-700) for potassium storage. Benefiting from the special microstructure, S-CM-700 exhibits the optimal performance and obtains high reversible capacity of 199.6 mAh·g −1 at 100 mA·g −1 , excellent rate property and prominent durability (0.0055% capacity decay per cycle during 1800 cycles). Kinetics analysis and electrochemical characterization are carried out to reveal that the potassium storage could be boosted by regulating the defect level, layer spacing and the content of sulfur-doping. The work provides a general synthesis approach to prepare sustainable carbon anodes for advanced PIBs. Graphical abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 29
·期 52
·78874-78886
·
IF 5.19
Xu Junge,Hu Die,Wang Yingmu,Zhang Ziwei
Ciprofloxacin (CIP) is a third-generation fluoroquinolones (FQs) antibiotic, and the occurrence of CIP in the water environment has raised growing concerns owning to its environmental toxicity. In this paper, a novel α-(Fe, Cu)OOH/RGO nanocomposite was synthesized via a one-step reflux method for CIP degradation through a photo-Fenton-like process. When the RGO content was 1 wt%, CIP degradation ratio by the α-(Fe, Cu)OOH/RGO nanocomposite reached 100% under visible light irradiation within 120 min, and total organic carbon (TOC) removal ratio reached 60% within 180 min. The result of molecular fluorescence spectra highlighted that the loading of RGO on the α-(Fe, Cu)OOH significantly increased the content of hydroxyl radicals (·OH) in the heterogeneous photo-Fenton-like system and simultaneously inhibited the recombination of photogenerated electron and hole, which played critical roles in the enhancement of CIP degradation. In addition, 11 main intermediates were identified as the degradation products of CIP in the α-(Fe, Cu)OOH/RGO/H 2 O 2 /visible light reaction systems using liquid chromatograph–mass spectrometer (LC-MS) analyses. The results demonstrated that three degradation pathways for CIP removal by α-(Fe, Cu)OOH/RGO nanocomposite occurred, including (i) oxidation on the piperazine ring and dealkylation, (ii) defluorination and decarboxylation, and (iii) hydroxylation on the quinolone ring. This work would provide a novel insight of CIP degradation pathways in photo-Fenton-like processes. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 21
·17036-17047
·
IF 2.779
Zheng Jiahong,Yang Yamei,Cheng Kangkang,Ma Junyu,Yu Pengfei
In this paper, a novel and selective fluorescent probe for nanocomposite materials were developed by in situ growth carbon quantum dots (CQDs) in the channel of mesoporous silica nanospheres (MSNs) for the detection of tetracycline (TC). The CQDs@MSNs nanocomposites were prepared via a facile hydrothermal method. The CQDs incorporated into MSNs can act as the low-toxicity and stable fluorescent probes for the detection of TC. Under optimal conditions, a fluorescence emission peak at 439 nm was observed for the CQDs@MSNs when the excitation wavelength was set as 360 nm, and the fluorescence peak intensity can be gradually quenched by TC via inner filter effect, a good linear relationship between the concentration of TC from 0 to 100 μM, and the fluorescence quenching intensity of CQDs@MSNs was obtained, with a limit detection of 5.19 μM. More importantly, the CQDs@MSNs have been successfully used for TC determination in real samples.
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