Organosulfur Compounds in CS2 Extractable-Fractions from Four Chinese Coals Oxidized with NaOCl

Four Chinese coals were oxidized with NaOCl aqueous solution under mild conditions. The reaction mixture was extracted with diethyl ether, carbon disulfide, petroleum ether, acetic ester and benzene sequentially. A series of organosulfur compounds (OSCs) were identified in the carbon disulfide fraction from the oxidized coals by GC/MS analysis but no OSCs were detected from other fractions except for 3 thiophene polycarboxylic acids found in ether-extraction. Some new types of sulfur function groups were also detected in the coal oxidation products which were not previously reported from coals. The results revealed that macromolecule OSCs in coals can be effectively degraded to water soluble small molecules with NaOCl aqueous solution, which can be enriched by carbon disulfide. Understanding the distribution of OSCs forms in coals matrix is useful in high value-added utilization of coals and coal desulphurization technologies.

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Preparation of Benzene Polycarboxylic Acids by Oxidation of Coal with NaOCl

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.236-238.864 ◽

2011 ◽

Vol 236-238 ◽

pp. 864-867 ◽

Cited By ~ 4

Author(s):

Gui Zhen Gong ◽

Xian Yong Wei ◽

Shang Li Wang ◽

Shao Peng Liu ◽

Ting Yao ◽

...

Keyword(s):

Aqueous Solution ◽

Value Added ◽

Oxidation Products ◽

Coal Oxidation ◽

Mild Conditions ◽

Polycarboxylic Acids ◽

Anthracite Coal

Taixi anthracite coal (TXC) was subjected to oxidation with NaOCl aqueous solution under mild conditions. The reaction mixture was extracted with ethoxyethane, followed by esterification with CH2N2, affording esterification products, which were analyzed by GC/MS. A large extent of benzene polycarboxylic acids (BPAs) were obtained in the coal oxidation products. The results showed that oxidation of coals with NaOCl aqueous solution is a useful technique for the high value-added utilization of coals.

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Molecular Distributions of Soluble Oxidation Products from Coals Characterized by Mass Spectrometers

International Journal of Analytical Chemistry ◽

10.1155/2018/5174172 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7

Author(s):

Xing Fan ◽

Fei Wang

Keyword(s):

Mass Spectrometry ◽

Direct Analysis ◽

Water Soluble ◽

Oxidation Products ◽

Gas Chromatography Mass Spectrometry ◽

Mass Spectrometers ◽

Polycarboxylic Acids ◽

Alkanoic Acids ◽

Carboxylic Groups ◽

Soluble Species

Oxidation of three coals with rank from lignite to anthracite in NaOCl aqueous solution was investigated in this study. The oxidation products were characterized by using gas chromatography/mass spectrometry and direct analysis in real-time mass spectrometry. The results showed that most of organic compounds in coals were converted into water-soluble species under mild conditions, even the anthracite. Benzene polycarboxylic acids (BPCAs) and chloro-substituted alkanoic acids (CSAAs) were major products from the reactions. The products from lower rank coals consist of considerable CSAAs and most products from high rank coals are BPCAs. As coal rank increases, the yield of BPCAs with more carboxylic groups increases.

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The dynamics of reaction of a water-soluble and non-.mu.-oxo dimer forming iron(III) porphyrin with tert-butyl hydroperoxide in aqueous solution. 1. Studies using a trap for immediate oxidation products

Journal of the American Chemical Society ◽

10.1021/ja00230a022 ◽

1988 ◽

Vol 110 (22) ◽

pp. 7411-7418 ◽

Cited By ~ 29

Author(s):

John R. Lindsay. Smith ◽

P. N. Balasubramanian ◽

Thomas C. Bruice

Keyword(s):

Aqueous Solution ◽

Water Soluble ◽

Oxidation Products ◽

Butyl Hydroperoxide ◽

Tert Butyl ◽

Tert Butyl Hydroperoxide

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ChemInform Abstract: The Dynamics of Reaction of a Water-Soluble and Non-μ-Oxo Dimer Forming Iron(III) Porphyrin with tert.-Butyl Hydroperoxide in Aqueous Solution. Part 1. Studies Using a Trap for Immediate Oxidation Products.

ChemInform ◽

10.1002/chin.198907261 ◽

1989 ◽

Vol 20 (7) ◽

Author(s):

J. R. L. SMITH ◽

P. N. BALASUBRAMANIAN ◽

T. C. BRUICE

Keyword(s):

Aqueous Solution ◽

Water Soluble ◽

Oxidation Products ◽

Butyl Hydroperoxide ◽

Tert Butyl ◽

Tert Butyl Hydroperoxide

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Oxidation of Huolinguole Lignite with NaOCl

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.734-737.584 ◽

2013 ◽

Vol 734-737 ◽

pp. 584-587

Author(s):

Gui Zhen Gong ◽

Ji Ming Chu ◽

Xian Yong Wei ◽

Zhi Min Zong

Keyword(s):

Trichloroacetic Acid ◽

Value Added ◽

Dichloroacetic Acid ◽

Promising Method ◽

Oxidation Products ◽

Short Chain ◽

Chlorinated Compounds ◽

Mild Conditions ◽

Polycarboxylic Acids ◽

Alkanoic Acids

Huolinguole lignite (HL) was oxidized with aqueous NaOCl solution under mild conditions. The oxidation products were analyzed by GC/MS. In total 111 products from the HL oxidation were detected, most of which were benzene polycarboxylic acids and short-chain alkanoic acids, while a predominant chlorinated compounds such as trichloromethane, dichloroacetic acid, trichloroacetic acid were also identified. These results indicate that oxidation of coals with aqueous NaOCl solution may be a promising method for high value-added utilization of coals.

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Enantioselective Recognition of Chiral Guests by the Water-Soluble Chiral Keplerate {Mo132} Spherical Capsule with 30 Inner Lactate Ligands

10.26434/chemrxiv.8847923.v1 ◽

2019 ◽

Author(s):

Nancy Watfa ◽

Weimin Xuan ◽

Zoe Sinclair ◽

Robert Pow ◽

Yousef Abul-Haija ◽

...

Keyword(s):

Aqueous Solution ◽

Chiral Recognition ◽

Association Constants ◽

Water Soluble ◽

Enantioselective Recognition ◽

H Nmr ◽

Dosy Nmr ◽

Spherical Capsule ◽

Surface Pores ◽

Guest Chemistry

Investigations of chiral host guest chemistry are important to explore recognition in confined environments. Here, by synthesizing water-soluble chiral porous nanocapsule based on the inorganic metal-oxo Keplerate-type cluster, {Mo132} with chiral lactate ligands with the composition [Mo132O372(H2O)72(x-Lactate)30]42- (x = D or L), it was possible to study the interaction with a chiral guest, L/D-carnitine and (R/S)-2-butanol in aqueous solution. The enantioselective recognition was studied by quantitative 1H NMR and 1H DOSY NMR which highlighted that the chiral recognition is regulated by two distinct sites. Differences in the association constants (K) of L- and D-carnitine, which, due to their charge, are generally restricted from entering the interior of the host, are observed, indicating that their recognition predominantly occurs at the surface pores of the structure. Conversely, a larger difference in association constants (KS/KR = 3) is observed for recognition within the capsule interior of (R)- and (S)-2-butanol.

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Sulfobetaine Cryogels for Preferential Adsorption of Methyl Orange from Mixed Dye Solutions

Polymers ◽

10.3390/polym13020208 ◽

2021 ◽

Vol 13 (2) ◽

pp. 208

Author(s):

Ramona B. J. Ihlenburg ◽

Anne-Catherine Lehnen ◽

Joachim Koetz ◽

Andreas Taubert

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Methyl Orange ◽

Dye Removal ◽

Selective Adsorption ◽

Water Soluble ◽

Organic Substances ◽

Preferential Adsorption ◽

Dimethyl Ammonium ◽

Dye Solutions

New cryogels for selective dye removal from aqueous solution were prepared by free radical polymerization from the highly water-soluble crosslinker N,N,N’,N’-tetramethyl-N,N’-bis(2-ethylmethacrylate)-propyl-1,3-diammonium dibromide and the sulfobetaine monomer 2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate. The resulting white and opaque cryogels have micrometer sized pores with a smaller substructure. They adsorb methyl orange (MO) but not methylene blue (MB) from aqueous solution. Mixtures of MO and MB can be separated through selective adsorption of the MO to the cryogels while the MB remains in solution. The resulting cryogels are thus candidates for the removal of hazardous organic substances, as exemplified by MO and MB, from water. Clearly, it is possible that the cryogels are also potentially interesting for removal of other compounds such as pharmaceuticals or pesticides, but this must be investigated further.

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Development of a versatile source apportionment analysis based on positive matrix factorization: a case study of the seasonal variation of organic aerosol sources in Estonia

Atmospheric Chemistry and Physics ◽

10.5194/acp-19-7279-2019 ◽

2019 ◽

Vol 19 (11) ◽

pp. 7279-7295 ◽

Cited By ~ 2

Author(s):

Athanasia Vlachou ◽

Anna Tobler ◽

Houssni Lamkaddam ◽

Francesco Canonaco ◽

Kaspar R. Daellenbach ◽

...

Keyword(s):

Matrix Factorization ◽

Organic Aerosol ◽

Positive Matrix Factorization ◽

Water Soluble ◽

Oxidation Products ◽

Positive Matrix ◽

Bootstrap Analysis ◽

Seasonal Behavior ◽

Yearly Cycle ◽

Aerosol Mass

Abstract. Bootstrap analysis is commonly used to capture the uncertainties of a bilinear receptor model such as the positive matrix factorization (PMF) model. This approach can estimate the factor-related uncertainties and partially assess the rotational ambiguity of the model. The selection of the environmentally plausible solutions, though, can be challenging, and a systematic approach to identify and sort the factors is needed. For this, comparison of the factors between each bootstrap run and the initial PMF output, as well as with externally determined markers, is crucial. As a result, certain solutions that exhibit suboptimal factor separation should be discarded. The retained solutions would then be used to test the robustness of the PMF output. Meanwhile, analysis of filter samples with the Aerodyne aerosol mass spectrometer and the application of PMF and bootstrap analysis on the bulk water-soluble organic aerosol mass spectra have provided insight into the source identification and their uncertainties. Here, we investigated a full yearly cycle of the sources of organic aerosol (OA) at three sites in Estonia: Tallinn (urban), Tartu (suburban) and Kohtla-Järve (KJ; industrial). We identified six OA sources and an inorganic dust factor. The primary OA types included biomass burning, dominant in winter in Tartu and accounting for 73 % ± 21 % of the total OA, primary biological OA which was abundant in Tartu and Tallinn in spring (21 % ± 8 % and 11 % ± 5 %, respectively), and two other primary OA types lower in mass. A sulfur-containing OA was related to road dust and tire abrasion which exhibited a rather stable yearly cycle, and an oil OA was connected to the oil shale industries in KJ prevailing at this site that comprises 36 % ± 14 % of the total OA in spring. The secondary OA sources were separated based on their seasonal behavior: a winter oxygenated OA dominated in winter (36 % ± 14 % for KJ, 25 % ± 9 % for Tallinn and 13 % ± 5 % for Tartu) and was correlated with benzoic and phthalic acid, implying an anthropogenic origin. A summer oxygenated OA was the main source of OA in summer at all sites (26 % ± 5 % in KJ, 41 % ± 7 % in Tallinn and 35 % ± 7 % in Tartu) and exhibited high correlations with oxidation products of a-pinene-like pinic acid and 3-methyl-1, 2, 3-butanetricarboxylic acid (MBTCA), suggesting a biogenic origin.

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