The Experts below are selected from a list of 536532 Experts worldwide ranked by ideXlab platform
Liangyuan Jia - One of the best experts on this subject based on the ideXlab platform.
-
Online Analysis of Biomass Pyrolysis Tar by Photoionization Mass Spectrometry
Energy & Fuels, 2016Co-Authors: Liangyuan Jia, Yann Le Brech, Guillain Mauviel, Matthias Bente-von Frowein, Sven Ehlert, Ralf Zimmermann, Anthony DufourAbstract:The Online Analysis of volatiles from biomass pyrolysis (or gasification or combustion) is interesting because it has the ability to sample the volatiles directly from their reactive environment. The photon ionization (PI) is an efficient and soft ionization method for Online Analysis of biomass pyrolysis volatiles. Here, we review recent developments conducted in our groups on PI–mass spectrometry (MS) Analysis of biomass pyrolysis volatiles by (1) synchrotron light PI–MS and (2) various commercial PI–MS techniques combined with various pyrolysis reactors. The fundamentals of PI–MS applied to biomass tar are briefly presented. The effect of photon energy on mass spectra from biomass volatiles is studied by synchrotron PI–MS. Different sources of PI–MS are then compared on vapors produced from fast pyrolysis in a microfluidized bed, namely, argon electron-beam-pumped excimer light (EBEL) vacuum ultraviolet (VUV) lamp single photon ionization (SPI)–MS (126 nm and 9.8 eV), laser Xe cell–SPI–MS (118 nm and 1...
-
Online Analysis of volatile products from bituminous coal pyrolysis with synchrotron vacuum ultraviolet photoionization mass spectrometry
Energy & Fuels, 2013Co-Authors: Liangyuan Jia, Junjie Weng, Yu Wang, Shaobo Sun, Zhouyue ZhouAbstract:Volatile species from pyrolysis of two kinds of bituminous coal, Huainan (HN) and Yima (YM), were investigated Online with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Mass spectra of products at different photon energies and temperatures were measured during the pyrolysis process. Some isomeric products can be characterized by the SVUV-PIMS based on their different ionization energies. Aromatic compounds are dominant pyrolysis products of these coal samples, while a number of aliphatic products were also observed. In comparison of these two coals, the HN coal probably has more condensed aromatic structures than YM coal. The different structures of the macromolecular network between HN and YM coals probably lead to different pyrolytic products at the same temperature. This work demonstrates the good performance of SVUV-PIMS in Online Analysis of complex coal pyrolysis.
Zhuomin Zhang - One of the best experts on this subject based on the ideXlab platform.
-
A covalently cross-linked microporous polymer based micro-solid phase extraction for Online Analysis of trace pesticide residues in citrus fruits.
Journal of separation science, 2019Co-Authors: Tianfu Wei, Zhuomin ZhangAbstract:Covalently cross-linked microporous polymers are a new class of highly cross-linked porous network materials with large surface area and potential superiority in sample pretreatment. In this work, a covalently cross-linked microporous polymer was well designed and synthesized by condensation of acylhydrazines in terephthalic dihydrazide with aldehyde groups in 1,3,5-benzenetricarboxaldehyde. The adsorption mechanism was explored and discussed based on π-π stacking interaction and steric effect. Then, a covalently cross-linked microporous polymer was employed as the adsorbent of Online micro-solid-phase extraction coupled with high-performance liquid chromatography for the enrichment and Analysis of trace pesticide residues in citrus fruits. The method was successfully applied to the Online Analysis of sugar orange and Huangdigan samples with the detection limits of 0.10-0.30 μg/kg. It was satisfactory that chlorpifos and triazophos in real sugar orange and Huangdigan samples could be actually found and quantified at concentrations of 0.20 and 0.51 mg/kg, respectively. The recoveries of sugar orange and Huangdigan samples were in the range of 70.0-103 and 74.0-119% with relative standard deviations of 0.4-9.7 and 0.5-9.2% (n = 3), respectively. The proposed method was accurate, reliable, and convenient for the Online simultaneous Analysis of trace pesticide residues in citrus fruits.
-
A hydrazone covalent organic polymer based micro-solid phase extraction for Online Analysis of trace Sudan dyes in food samples.
Journal of chromatography. A, 2015Co-Authors: Chengjiang Zhang, Zhuomin ZhangAbstract:Covalent organic polymers (COPs) connected by covalent bonds are a new class of porous network materials with large surface area and potential superiority in sample pretreatment. In this study, a new hydrazone linked covalent organic polymer (HL-COP) adsorbent was well-designed and synthesized based on a simple Schiff-base reaction. The condensation of 1,4-phthalaldehyde and 1,3,5-benzenetricarbohydrazide as organic building blocks led to the synthesis of HL-COP with uniform particle size and good adsorption performance. This HL-COP adsorbent with high hydrophobic property and rich stacking π electrons contained abundant phenyl rings and imine (CN) groups throughout the entire molecular framework. The adsorption mechanism was explored and discussed based on π-π affinity, hydrophobic effect, hydrogen bonding and electron-donor-acceptor (EDA) interaction, which contributed to its strong recognition affinity to target compounds. Enrichment factors were 305-757 for six Sudan dyes by HL-COP micro-solid phase extraction (μ-SPE), indicating its remarkable preconcentration ability. Furthermore, the adsorption amounts by HL-COP μ-SPE were 1.0-11.0 folds as those by three commonly used commercial adsorbents. Then, HL-COP was applied as adsorbent of Online μ-SPE coupled with high performance liquid chromatography (HPLC) for enrichment and Analysis of trace Sudan dyes in food samples with detection limit of 0.03-0.15μg/L. The method was successfully applied for Online Analysis of chilli powder and sausage samples. Sudan II and Sudan III in one positive chilli powder sample were actually found and determined with concentrations of 8.3 and 6.8μg/kg, respectively. The recoveries of chilli powder and sausage samples were in range of 75.8-108.2% and 73.8-112.6% with relative standard deviations of 1.2-8.5% and 1.9-9.4% (n=5), respectively. The proposed method was accurate, reliable and convenient for the Online simultaneous Analysis of trace Sudan dyes in food samples.
-
Acrylamide‐functionalized graphene micro‐solid‐phase extraction coupled to high‐performance liquid chromatography for the Online Analysis of trace monoamine acidic metabolites in biological samples
Journal of separation science, 2015Co-Authors: Xiaoting Yang, Zhuomin ZhangAbstract:Monoamine acidic metabolites in biological samples are essential biomarkers for the diagnosis of neurological disorders. In this work, acrylamide-functionalized graphene adsorbent was successfully synthesized by a chemical functionalization method and was packed in a homemade polyether ether ketone micro column as a micro-solid-phase extraction unit. This micro-solid-phase extraction unit was directly coupled to high-performance liquid chromatography to form an Online system for the separation and Analysis of three monoamine acidic metabolites including homovanillic acid, 5-hydroxyindole-3-acetic acid, and 3,4-dihydroxyphenylacetic acid in human urine and plasma. The Online system showed high stability, permeability, and adsorption capacity toward target metabolites. The saturated extraction amount of this Online system was 213.1, 107.0, and 153.4 ng for homovanillic acid, 5-hydroxyindole-3-acetic acid, and 3,4-dihydroxyphenylacetic acid, respectively. Excellent detection limits were achieved in the range of 0.08–0.25 μg/L with good linearity and reproducibility. It was interesting that three targets in urine and plasma could be actually quantified to be 0.94–3.93 μg/L in plasma and 7.15–19.38 μg/L in urine. Good recoveries were achieved as 84.8–101.4% for urine and 77.8–95.1% for plasma with the intra- and interday relative standard deviations less than 9.3 and 10.3%, respectively. This method shows great potential for Online Analysis of trace monoamine acidic metabolites in biological samples.
Zhouyue Zhou - One of the best experts on this subject based on the ideXlab platform.
-
Online Analysis of volatile products from bituminous coal pyrolysis with synchrotron vacuum ultraviolet photoionization mass spectrometry
Energy & Fuels, 2013Co-Authors: Liangyuan Jia, Junjie Weng, Yu Wang, Shaobo Sun, Zhouyue ZhouAbstract:Volatile species from pyrolysis of two kinds of bituminous coal, Huainan (HN) and Yima (YM), were investigated Online with tunable synchrotron vacuum ultraviolet photoionization mass spectrometry (SVUV-PIMS). Mass spectra of products at different photon energies and temperatures were measured during the pyrolysis process. Some isomeric products can be characterized by the SVUV-PIMS based on their different ionization energies. Aromatic compounds are dominant pyrolysis products of these coal samples, while a number of aliphatic products were also observed. In comparison of these two coals, the HN coal probably has more condensed aromatic structures than YM coal. The different structures of the macromolecular network between HN and YM coals probably lead to different pyrolytic products at the same temperature. This work demonstrates the good performance of SVUV-PIMS in Online Analysis of complex coal pyrolysis.
Yang Zhou - One of the best experts on this subject based on the ideXlab platform.
-
Online Analysis of initial volatile products of Shenhua coal and its macerals with pyrolysis vacuum ultraviolet photoionization mass spectrometry
Fuel Processing Technology, 2017Co-Authors: Zhiwei Shi, Lijun Jin, Yang ZhouAbstract:Abstract Initial volatile products from pyrolysis of Shenhua coal and its macerals were investigated by using Online pyrolysis-vacuum ultraviolet photoionization mass spectrometry (Py-VUVPI-MS). The fragment-free spectra of initial volatile products were measured during the temperature-programmed pyrolysis of the samples, and the intensity profiles of the initial volatile products as the function of temperature were detected. Mononuclear aromatics and phenols are the primary constituents of initial volatile products along with alkenes, n -alkyl naphthalene, n -alkyl naphthol, etc. The relative content of phenols evolved from coal macerals shows the order of vitrinite > raw coal > inertinite and that of polycyclic aromatic hydrocarbons (PAHs) exhibits the opposite trends. The different relative content in initial volatile products can be attributed to the different structures of coal macerals. The main source of phenols is the thermal decomposition of the oxygen-containing functional groups. PAHs come from two parts: thermal decomposition of coal macromolecular and free PAHs in mobile phase. This work provides a method for Online Analysis of initial pyrolytic products from coal by Py-VUVPI-MS.
Anthony Dufour - One of the best experts on this subject based on the ideXlab platform.
-
Online Analysis of Biomass Pyrolysis Tar by Photoionization Mass Spectrometry
Energy & Fuels, 2016Co-Authors: Liangyuan Jia, Yann Le Brech, Guillain Mauviel, Matthias Bente-von Frowein, Sven Ehlert, Ralf Zimmermann, Anthony DufourAbstract:The Online Analysis of volatiles from biomass pyrolysis (or gasification or combustion) is interesting because it has the ability to sample the volatiles directly from their reactive environment. The photon ionization (PI) is an efficient and soft ionization method for Online Analysis of biomass pyrolysis volatiles. Here, we review recent developments conducted in our groups on PI–mass spectrometry (MS) Analysis of biomass pyrolysis volatiles by (1) synchrotron light PI–MS and (2) various commercial PI–MS techniques combined with various pyrolysis reactors. The fundamentals of PI–MS applied to biomass tar are briefly presented. The effect of photon energy on mass spectra from biomass volatiles is studied by synchrotron PI–MS. Different sources of PI–MS are then compared on vapors produced from fast pyrolysis in a microfluidized bed, namely, argon electron-beam-pumped excimer light (EBEL) vacuum ultraviolet (VUV) lamp single photon ionization (SPI)–MS (126 nm and 9.8 eV), laser Xe cell–SPI–MS (118 nm and 1...
