Characteristics and utilization of weathered coal and its humic acid in China

2002 ◽  
Vol 43 (1) ◽  
pp. 3
Keyword(s):  
Humic Acid ◽  
Weathered Coal ◽  
Characteristics And Utilization

scholarly journals Characterization of Ultrafiltration-Fractionated Humic Acid Derived from Chinese Weathered Coal by Spectroscopic Techniques

Agronomy ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 2030
Author(s):  
Shuiqin Zhang ◽  
Liang Yuan ◽  
Yanting Li ◽  
Bingqiang Zhao
Keyword(s):  
Molecular Weight ◽  
Humic Acid ◽  
Atomic Ratio ◽  
Raw Material ◽  
Spectroscopic Techniques ◽  
Acid Fraction ◽  
Aromatic Rings ◽  
Xps Spectra ◽  
Weathered Coal ◽  
Degree Of Aromaticity

Weathered coal is a widely used raw material of farm-oriented humic acid in China, while the high heterogeneity impedes its sufficient utilization. In this study, we fractionated the humic acid derived from Chinese weathered coal by ultrafiltration, and three fractions with the molecular range of ≥100 kDa, 10–100 kDa, ≤10 kDa were obtained. Subsequently, the chemical and spectral properties of the fractions were characterized by elemental analysis, potentiometric titration, Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR), and X-ray photoelectron (XPS) and other spectroscopy. The results showed that more than 60% of humic acid by weight was concentrated in the molecular range higher than 100 kDa, while only 3.25% was assigned to that with molecular weight lower than 10 kDa. The humic acid fraction with molecular weight higher than 100 kDa showed more carbon content, lower H/C atomic ratio, while higher E4/E6 ratio, more aromatic structure in FTIR, 13C NMR, and XPS spectra, indicating a higher degree of aromaticity and stronger hydrophobicity. Conversely, there were more carboxyl groups and aliphatic structures, while fewer condensed aromatic rings for the humic acid fraction with molecular weight less than 100 kDa. These differences provide a baseline for the better utilization of weathered coal.

scholarly journals Removal of Cd(II) from Water by HPEI Modified Humin

2020 ◽  
Vol 12 (19) ◽  
pp. 7931
Author(s):  
Sanmei Li ◽  
Mingda Wu ◽  
Linghong Lu ◽  
Jiabao Zhu
Keyword(s):  
Humic Acid ◽  
Adsorption Capacity ◽  
Low Cost ◽  
Raw Material ◽  
Flame Atomic Absorption Spectroscopy ◽  
X Ray ◽  
Adsorption Performance ◽  
Flame Atomic Absorption ◽  
Weathered Coal ◽  
Cost Treatment

Humin is the waste residue from the process of preparing humic acid, which accounts for a large proportion of the raw material (weathered coal humic acid). Its Cd(II) adsorption performance is far inferior to that of humic acid. How to regenerate humin is of great significance to the low-cost treatment of Cd(II) pollution in wastewater. In this study, humin was modified by hyperbranched polyethyleneimine to enhance the adsorption capacity for Cd(II). Fourier transform infrared spectroscopy and the X-ray photoelectron spectrometer showed that hyperbranched polyethyleneimine was grafted to the surface of humin. Flame atomic absorption spectroscopy showed that the saturated Cd(II) adsorption capacity of the modified humin was increased to 11.975 mg/g, which is about 5 times than that of humin and is also higher than that of humic acid. The adsorption kinetics, adsorption isotherm, and thermodynamic properties of humic acid, humin, and modified humin were also studied. This study may provide a foundation for research utilizing natural resources to reduce heavy metal pollution in the environment.

scholarly journals Preparation of Fulvic Acid and Low-molecular Organic Acids by Oxidation of Weathered Coal Humic Acid.

2002 ◽  
pp. 345-350 ◽  
Author(s):  
Toshiyuki SHINOZUKA ◽  
Akira ITO ◽  
Osamu SASAKI ◽  
Yuki YAZAWA ◽  
Tatsuaki YAMAGUCHI
Keyword(s):  
Humic Acid ◽  
Organic Acids ◽  
Fulvic Acid ◽  
Weathered Coal

Sorption of norfloxacin onto humic acid extracted from weathered coal

2012 ◽  
Vol 102 ◽  
pp. 165-172 ◽  
Author(s):  
Qin Zhang ◽  
Ling Zhao ◽  
Yuan-hua Dong ◽  
Guan-yi Huang
Keyword(s):  
Humic Acid ◽  
Weathered Coal

scholarly journals Effects of urea enhanced with different weathered coal-derived humic acid components on maize yield and fate of fertilizer nitrogen

2019 ◽  
Vol 18 (3) ◽  
pp. 656-666 ◽  
Author(s):  
Shui-qin ZHANG ◽  
Liang YUAN ◽  
Wei LI ◽  
Zhi-an LIN ◽  
Yan-ting LI ◽  
...  
Keyword(s):  
Humic Acid ◽  
Maize Yield ◽  
Fertilizer Nitrogen ◽  
Weathered Coal

Characterization of dissolved organic matter (DOM) extracted from soils by hot water percolation (HWP)

2010 ◽  
Vol 59 (1) ◽  
pp. 99-108 ◽  
Author(s):  
M. Takács ◽  
Gy. Füleky
Keyword(s):  
Organic Matter ◽  
Humic Acid ◽  
Natural Organic Matter ◽  
Extraction Methods ◽  
Soil Samples ◽  
Hot Water ◽  
Soil Extracts ◽  
Water Percolation ◽  
Soil Humic Acid

The Hot Water Percolation (HWP) technique for preparing soil extracts has several advantages: it is easily carried out, fast, and several parameters can be measured from the same solution. The object of this study was to examine the possible use of HWP extracts for the characterization of soil organic matter. The HPLC-SEC chromatograms, UV-VIS and fluorescence properties of the HWP extracts were studied and the results were compared with those of the International Humic Substances Society (IHSS) Soil Humic Acid (HA), IHSS Soil Fulvic Acid (FA) and IHSS Suwannee Natural Organic Matter (NOM) standards as well as their HA counterparts isolated by traditional extraction methods from the original soil samples. The DOM of the HWP solution is probably a mixture of organic materials, which have some characteristics similar to the Soil FA fractions and NOM. The HWP extracted organic material can be studied and characterized using simple techniques, like UV-VIS and fluorescence spectroscopy.

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