Spectroscopic and structural characterization of a fulvic acid from weathered coal

Zuyi, Tao; Yang, Yuhui; Sheng, Fenling

doi:10.1080/02772249509358175

Cited by 26 publications

(1 citation statement)

References 12 publications

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“…The structural pattern of the humic acids derived from weathered coal according to the 13 C–CP/MAS–NMR assay was comparable with that of humic acids from weathered coals [32, 38], lignite [20–21, 39–40], and even composted wastes [41–42]. This result demonstrated the samples in the present investigation well represent a general humic acids structural pattern.…”

Section: Discussionsupporting

confidence: 79%

Structural characteristics of humic acids derived from Chinese weathered coal under different oxidizing conditions

et al. 2019

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Humic acids derived from Chinese weathered coal were oxidized with hydrogen peroxide (H 2 O 2 ) under various conditions, and their chemical composition and structure were examined. The raw material humic acids (HA) and oxidized humic acids (OHAs) were characterized by elemental analysis and ultraviolet visible (UV-Vis), Fourier transform infrared (FTIR), and solid-state 13 C nuclear magnetic resonance (NMR) spectroscopy. Our results show that aromatic functional groups accounted for more than 70% of the HA and OHAs and there were significant differences in their structures and compositions. Compared to the HA, the average H and N contents of the OHAs decreased by 5.15% and 2.52%, respectively, and the average O content of those of the OHAs increased by 5.30%. The hydrophobicity index (HI) of HA is higher than those of the OHAs. Importantly, in the hypothesis test between the properties and preparation conditions of humic acid using SPSS, the partial η 2 of the temperature, hydrogen peroxide concentration, liquid-solid ratio, and time were 0.809, 0.771, 0.748 and 0.729, respectively; thus, among the preparation conditions, temperature is the most important factor affecting the humic acids properties.

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Section: Discussionsupporting

confidence: 79%

Structural characteristics of humic acids derived from Chinese weathered coal under different oxidizing conditions

et al. 2019

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Sorption and desorption characteristics of Eu(III) on red earth

Dong

Wang

et al. 1999

J Radioanal Nucl Chem

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The batch method and the column method were simultaneously employed to study the sorption and desorption of Eu(III) on red earth as a function of pH (4.6-6), the presence of a well-characterized fulvic acid (FA) and the iron oxides content of red earth. The results from bo[h methods were consistent qualitatively. The Eu(III) sorption showed significant dependences on pH and FA, the sorption was increased with increasing pH and by addition of FA to the solutions, while the iron oxides content of the red earth had a negative contribution to the sorption of Eu(III). Additionally, the sorption-desorption hysteresis of Eu(III) on red earth occurred at a pH range of 4.6-6. Therefore, the humic substance and high pH have a great tendency to immobilize Eu(III) on red earth.

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Sorption and desorption of radioselenium on red earth and its solid components

Dong

Wang

et al. 1999

J Radioanal Nucl Chem

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The effect of organic matter and iron oxides as solid components of the red earth on the retention of SeO 3 has been investigated by a batch technique and selective extraction method. The sorption and desorption isotherms of SeO 3 on the untreated red earth and the three treated soils were determined at 20 ~ pH 6.8 or 7.2 and in the presence of0.01M CaCI 2. It was found that the sorption-desorption hysteresis for untreated and treated soils is obvious and the clays play an important role in the sorption-desorption hysteresis, and that the retention of SeO 3 on red earth is attributed to the iron oxides to a great extent.

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Spectroscopic and structural characterization of a fulvic acid from weathered coal

Cited by 26 publications

References 12 publications

Structural characteristics of humic acids derived from Chinese weathered coal under different oxidizing conditions

Structural characteristics of humic acids derived from Chinese weathered coal under different oxidizing conditions

Sorption and desorption characteristics of Eu(III) on red earth

Sorption and desorption of radioselenium on red earth and its solid components

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