Search

Your search keyword '"Zhao, Xian‐En"' showing total 316 results
Start Over Author "Zhao, Xian‐En"
316 results on '"Zhao, Xian‐En"'

59. Biomass Juncus derived carbon decorated with cobalt nanoparticles enables high-efficiency ammonia electrosynthesis by nitrite reduction

Author

Wang, Jiaqian, primary, Liang, Jie, additional, Liu, Pengyu, additional, Yan, Zhe, additional, Cui, Linxia, additional, Yue, Luchao, additional, Zhang, Longcheng, additional, Ren, Yuchun, additional, Li, Tingshuai, additional, Luo, Yonglan, additional, Liu, Qian, additional, Zhao, Xian-En, additional, Li, Na, additional, Tang, Bo, additional, Liu, Yang, additional, Gao, Shuyan, additional, Asiri, Abdullah M., additional, Hao, Haigang, additional, Gao, Rui, additional, and Sun, Xuping, additional

Published
2022
Full Text
View/download PDF

60. A gradient hexagonal-prism Fe3Se4@SiO2@C configuration as a highly reversible sodium conversion anode

Author

Zhao, Wenxi, primary, Ma, Xiaoqing, additional, Yue, Luchao, additional, Zhang, Longcheng, additional, Luo, Yongsong, additional, Ren, Yuchun, additional, Zhao, Xian-En, additional, Li, Na, additional, Tang, Bo, additional, Liu, Qian, additional, Liu, Yang, additional, Gao, Shuyan, additional, Alshehri, Abdulmohsen Ali, additional, and Sun, Xuping, additional

Published
2022
Full Text
View/download PDF

63. CoS2@TiO2 nanoarray: a heterostructured electrocatalyst for high-efficiency nitrate reduction to ammonia.

Author

Zhao, Xian-En, Li, Zerong, Gao, Shuo, Sun, Xuping, and Zhu, Shuyun

Subjects
*AMMONIA, *CATALYST selectivity, *STANDARD hydrogen electrode, *DENITRIFICATION, *NANOPARTICLES, *ELECTROLYTIC reduction, *NITROGEN cycle
Abstract

Electrochemical nitrate (NO3−) reduction emerges as a promising strategy to maintain the balance of the global nitrogen cycle and an alternative to nitrogen electroreduction for ambient ammonia (NH3) synthesis. However, the complicated multiple-electron transfer process of NO3−-to-NH3 conversion demands catalysts with high selectivity for NH3 production. Herein, CoS2 nanoparticle decorated TiO2 nanobelt array on a titanium plate (CoS2@TiO2/TP) is reported as a superb electrocatalyst for the NO3− reduction reaction. In 0.1 M NaOH containing 0.1 M NO3−, CoS2@TiO2/TP offers a large NH3 yield of 538.21 μmol h−1 cm−2 at −0.7 V vs. reversible hydrogen electrode (RHE) and a high faradaic efficiency of 92.80% at −0.5 V vs. RHE. Additionally, it also shows strong stability for the 20 h electrolysis test. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

80. A gradient hexagonal-prism Fe3Se4@SiO2@C configuration as a highly reversible sodium conversion anode.

Author

Zhao, Wenxi, Ma, Xiaoqing, Yue, Luchao, Zhang, Longcheng, Luo, Yongsong, Ren, Yuchun, Zhao, Xian-En, Li, Na, Tang, Bo, Liu, Qian, Liu, Yang, Gao, Shuyan, Alshehri, Abdulmohsen Ali, and Sun, Xuping

Abstract

Metal selenides have attracted great interest for high-efficiency sodium storage owing to their remarkable advantages of physicochemical features and electrochemical activity. However, substantial issues (e.g. poor intrinsic conductivity, severe interfacial side reactions and electrode structural destruction) in the electrochemical storage process restrict their practical feasibility and commercial prospects. Herein, a gradient hexagonal-prism configuration was exquisitely designed and developed via in situ conformal growth of double-shell silicon dioxide/carbon (SiO2@C) reactors on highly uniform Fe-based MIL-88A nanorods and subsequent selenization–carbonization treatment (Fe3Se4@SiO2@C). In the ingeniously designed Fe3Se4@SiO2@C nanorods, the outer double-shell SiO2@C reactors as charge-transfer and deformation-defense layers provide excellent ionic permeability and efficient charge-transfer channels and meanwhile endow superb resistance of volume variation, whereas the inner Fe3Se4 nanorods as a sodium-storage layer feature ample active sites for enhancing reversible capacity and satisfying surface-driven capacitive behaviors. Motivated by its distinctive structure and favorable properties, Fe3Se4@SiO2@C is tremendously conducive to efficient sodium storage, as corroborated by its excellent rate capability and extraordinary stability with an ultrahigh reversible capacity of 272 mA h g−1 at 20.0 A g−1 after 4200 cycles; these results obviously outperform those of the contrast samples Fe3Se4@SiO2 and single Fe3Se4@C as well as other reported Fe-based selenides. The conjunct exploration of ex situ structural characterizations strongly revealed a combination mechanism of intercalation and conversion from Fe3Se4 to the intermediate NaxFe3Se4 and the final states NaxSe/Fe. More interestingly, a Fe3Se4@SiO2@C//Na3V2(PO4)3@C full cell configuration enables a considerably high capacity of 241 mA h g−1 at 1.0 A g−1 after 100 cycles, revealing great practical feasibility in energy storage systems. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

81. MOF@MnO2 nanocomposites prepared using in situ method and recyclable cholesterol oxidase–inorganic hybrid nanoflowers for cholesterol determination.

Author

Xu, Dawei, Li, Cong, Zi, Yuqiu, Jiang, Dafeng, Qu, Fei, and Zhao, Xian-En

Subjects
CHOLESTEROL, TERBIUM, BLOOD cholesterol, ENZYME stability, NANOCOMPOSITE materials, SENSITIVITY & specificity (Statistics)
Abstract

In this work, through the in situ growth of MnO2 nanosheets on the surface of terbium metal–organic frameworks (Tb–MOFs), MOF@MnO2 nanocomposites are prepared and the fluorescence of Tb–MOFs is quenched significantly by MnO2. Additionally, the hybrid nanoflowers are self-assembled by cholesterol oxidase (ChOx) and copper phosphate (Cu3(PO4)2·3H2O). Then a new strategy for cholesterol determination is developed based on MOF@MnO2 nanocomposites and hybrid nanoflowers. Cholesterol is oxidized under the catalysis of hybrid nanoflowers to yield H2O2, which further reduces MnO2 nanosheets into Mn2+. Hence, the fluorescence recovery of Tb–MOFs is positively correlated to the concentration of cholesterol in the range of 10 to 360 μM. The limit of detection (LOD) of cholesterol is 1.57 μM. On the other hand, the hierarchical and confined structure of ChOx–inorganic hybrid nanoflowers greatly improve the stability of the enzyme. The activity of hybrid nanoflowers remains at a high level for one week when stored at room temperature. Moreover, the hybrid nanoflowers can be collected by centrifugation and reused. The activity of hybrid nanoflowers can continue at a high level for five cycles of determination. Therefore, it can be concluded that the hybrid nanoflowers are more stable and more economic than free enzymes, and they show a similar sensitivity and specificity to cholesterol compared with free ChOx. Finally, this strategy has been further validated for the determination of cholesterol in serum samples with satisfactory recoveries. [ABSTRACT FROM AUTHOR]

Published
2021
Full Text
View/download PDF

82. Stable isotope labeling derivatization coupled with magnetic dispersive solid phase extraction for the determination of hydroxyl-containing cholesterol and metabolites by in vivo microdialysis and ultra-high performance liquid chromatography tandem mass spectrometry

Author

Wang, Xin, primary, Sun, Jing, additional, Zhao, Xian-En, additional, Xu, Yanqiu, additional, Sun, Luping, additional, Zhu, Shuyun, additional, You, Jinmao, additional, and Wang, Xiao, additional

Published
2019
Full Text
View/download PDF

84. In situgrowth of polydopamine on surface of covalent organic frameworks under the catalysis of acid phosphatase for dopamine detection

Author

Qu, Fei, Guo, Ziwei, Jiang, Dafeng, and Zhao, Xian-En

Abstract

Dopamine (DA) is catalyzed by acid phosphatase to polymerize into polydopamine which quenches the fluorescence of covalent organic frameworks. This strategy shortens the time greatly for the polymerization of DA and realizes the selective detection of DA.

Published
2021
Full Text
View/download PDF

85. Convenient and sensitive colorimetric determination of alendronate sodium with Ce4+-triggered oxidation of TMB.

Author

Sun, Jing, Wang, Rui, Xia, Meng, Zhu, Shuyun, and Zhao, Xian-En

Subjects
ALENDRONATE, OXIDATION-reduction reaction, OXIDATION, BODY fluids, DETECTION limit, CERIUM oxides
Abstract

As alternatives to nanozymes, some metal ions have been used in chemical/biochemical sensors owing to their facile acquisition avoiding tedious preparation and purification. Ce4+ has been reported to possess oxidase-like activity. Ascribed to its strong oxidative ability, Ce4+ can trigger the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue product oxTMB without the requirement of H2O2. When ALDS is added, the oxidation ability of Ce4+ can be reduced because of the redox reaction between Ce4+ and ALDS. The absorbance intensity ascribed to oxTMB decreases followed by the fading of the solution. On the basis of such a mechanism, a simple method is proposed for monitoring ALDS in two linear ranges of 0.1–10.0 μM and 10.0–60.0 μM. The detection limit is low to 0.05 μM. Furthermore, this method exhibits great potential for ALDS detection in real biological body fluids and pharmaceutical samples. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

86. Simultaneous Determination of Oleanolic Acid and Ursolic Acid by in Vivo Microdialysis via UHPLC-MS/MS Using Magnetic Dispersive Solid Phase Extraction Coupling with Microwave-Assisted Derivatization and Its Application to a Pharmacokinetic Study of Arctiumlappa L. Root Extract in Rats

Author

Zheng, Zhenjia, primary, Zhao, Xian-En, additional, Zhu, Shuyun, additional, Dang, Jun, additional, Qiao, Xuguang, additional, Qiu, Zhichang, additional, and Tao, Yanduo, additional

Published
2018
Full Text
View/download PDF

91. A new combined method of stable isotope-labeling derivatization-ultrasound-assisted dispersive liquid–liquid microextraction for the determination of neurotransmitters in rat brain microdialysates by ultra high performance liquid chromatography tandem mass spectrometry

Author

Zheng, Longfang, primary, Zhao, Xian-En, additional, Zhu, Shuyun, additional, Tao, Yanduo, additional, Ji, Wenhua, additional, Geng, Yanling, additional, Wang, Xiao, additional, Chen, Guang, additional, and You, Jinmao, additional

Published
2017
Full Text
View/download PDF

92. Rapid and sensitive determination of multiple endocrine-disrupting chemicals by ultrasound-assisted in situ derivatization dispersive liquid-liquid microextraction coupled with ultra-high-performance liquid chromatography/tandem mass spectrometry

Author

Wei, Na, primary, Zheng, Zhenjia, additional, Wang, Yuhua, additional, Tao, Yanduo, additional, Shao, Yun, additional, Zhu, Shuyun, additional, You, Jinmao, additional, and Zhao, Xian-En, additional

Published
2017
Full Text
View/download PDF

93. Mass Spectrometric Identification of Aliphatic Amines Using 2-(11H-benzo[a]carbazol-11-yl) Ethyl Chloroformate as Fluorescence Labeling Reagent

Author

Zhu Fang, You Jin-mao, Zhao Xian-En, Zhao Wen-Chen, Liu Su-Juan, Suo Yourui, and Liu Ling-Jun

Subjects
Detection limit, chemistry.chemical_compound, Chromatography, chemistry, Resolution (mass spectrometry), Reagent, Ethyl chloroformate, Atmospheric-pressure chemical ionization, High-performance liquid chromatography, Fluorescence, Ion source, Analytical Chemistry
Abstract

A simple and highly sensitive method based on the precolumn derivatization has been developed for the determination of aliphatic amines in food by using a nitrogen-containing 2-(11 H -benzo[a]carbazol-11-yl)ethyl chloroformate (BCEC-Cl) as a fluorescence labeling reagent followed by high-performance liquid chromatography (HPLC) with fluorescence detection, and online postcolumn MS identification. The stable derivatives can be obtained by the labeling reaction of BCEC-Cl with amines in the presence of a borate buffer (pH 9.0) within 3 min. The maximum excitation and emission wavelengths are at λ ex = 279 nm and λ em = 380 nm respectively. Separation of 12 amine-derivatives was achieved by a gradient elution on a reversed-phase Eclipse XDB C 8 (150 mm × 4.6 mm, 5 μm) column with a good baseline resolution. The identification of amine-derivatives is carried out by online postcolumn MS using atmospheric pressure chemical ionization (APCI) as an ion source in positive-ion detection mode. The established method exhibits excellent reproducibility and recovery. Excellent linear responses are observed with coefficients > 0.9996, detection limits (at signal-to-noise ratio of 3:1) are at 1.77–14.4 f mol levels.

Published
2007

95. A convenient fluorescent assay for quinolones based on their inhibition towards the oxidase-like activity of Cu2+.

Author

Zhu, Shuyun, Cao, Han, Yan, Xiaolu, Sun, Jing, Qiu, Jiayi, Qu, Xiaoqing, Zuo, Ya-Nan, Wang, Xiao, and Zhao, Xian-En

Subjects
QUINOLONE antibacterial agents, OXIDASES, COPPER ions
Abstract

In this work, we proposed a convenient fluorescent assay for the detection of quinolones based on their inhibition towards the oxidation of o-phenylenediamine (OPD) by copper ions (Cu2+). Free Cu2+ can oxidize OPD into fluorescent 2,3-diaminophenzine followed by the formation of copper nanoparticles (CuNPs), which would further catalyze the oxidation of OPD. When quinolones were added, their strong binding affinity to Cu2+ inhibited the oxidase-like activity of Cu2+. So, the fluorescence intensity of the Cu2+–OPD system decreased obviously. The determination of quinolones can be achieved by using this fluorimetric assay without the use of complicated instruments and protocols. As demonstrated, this assay offered a highly sensitive readout for quinolones including nalidixic acid, cinoxacin, ciprofloxacin, and moxifloxacin in the linear ranges of 1.0–100 nM, 0.5–100 nM, 1.0–100 nM, and 0.1–100 nM, respectively. In addition, the developed assay was successfully applied to the direct analysis of quinolones in real amples. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

96. Simultaneous Determination of Food-Related Biogenic Amines and Precursor Amino Acids Using in Situ Derivatization Ultrasound-Assisted Dispersive Liquid–Liquid Microextraction by Ultra-High-Performance Liquid Chromatography Tandem Mass Spectrometry

Author

He, Yongrui, primary, Zhao, Xian-En, additional, Wang, Renjun, additional, Wei, Na, additional, Sun, Jing, additional, Dang, Jun, additional, Chen, Guang, additional, Liu, Zhiqiang, additional, Zhu, Shuyun, additional, and You, Jinmao, additional

Published
2016
Full Text
View/download PDF

99. Dual ultrasonic-assisted dispersive liquid–liquid microextraction coupled with microwave-assisted derivatization for simultaneous determination of 20( S )-protopanaxadiol and 20( S )-protopanaxatriol by ultra high performance liquid chromatography–tandem mass spectrometry

Author

Zhao, Xian-En, primary, Lv, Tao, additional, Zhu, Shuyun, additional, Qu, Fei, additional, Chen, Guang, additional, He, Yongrui, additional, Wei, Na, additional, Li, Guoliang, additional, Xia, Lian, additional, Sun, Zhiwei, additional, Zhang, Shijuan, additional, You, Jinmao, additional, Liu, Shu, additional, Liu, Zhiqiang, additional, Sun, Jing, additional, and Liu, Shuying, additional

Published
2016
Full Text
View/download PDF

100. Sensitive and accurate determination of neurotransmitters from in vivo rat brain microdialysate of Parkinson's disease using in situ ultrasound-assisted derivatization dispersive liquid–liquid microextraction by UHPLC-MS/MS

Author

Zhao, Xian-En, primary, He, Yongrui, additional, Yan, Ping, additional, Wei, Na, additional, Wang, Renjun, additional, Sun, Jing, additional, Zheng, Longfang, additional, Zhu, Shuyun, additional, and You, Jinmao, additional

Published
2016
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results