2020
DOI: 10.1016/j.fuel.2020.117210
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Establishment of a molecular structure model for classified products of coal-based fulvic acid

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Cited by 23 publications
(19 citation statements)
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“…Humus acids (HAs) that contain C, N, O, H, S. Their elemental composition presented in different sources [1] depends on the place of their formation and extraction method. HAs contain numerous oxidized functional groups, such as hydroxyl and carboxyl groups representing strong chelation and adsorption [2][3][4]. In anaerobic conditions, they contribute to the reduction of methane emission [5], act as catalyzers in various dissolution and precipitation processes [6], e.g., in water and sewage they participate in dissolving pharmaceutical products [7] as well as other organic and inorganic substances, in the sorption and transport of metals [8], they form insoluble complexes with iron and manganese which significantly impedes the process of groundwater purification.…”
Section: Introductionmentioning
confidence: 99%
“…Humus acids (HAs) that contain C, N, O, H, S. Their elemental composition presented in different sources [1] depends on the place of their formation and extraction method. HAs contain numerous oxidized functional groups, such as hydroxyl and carboxyl groups representing strong chelation and adsorption [2][3][4]. In anaerobic conditions, they contribute to the reduction of methane emission [5], act as catalyzers in various dissolution and precipitation processes [6], e.g., in water and sewage they participate in dissolving pharmaceutical products [7] as well as other organic and inorganic substances, in the sorption and transport of metals [8], they form insoluble complexes with iron and manganese which significantly impedes the process of groundwater purification.…”
Section: Introductionmentioning
confidence: 99%
“…ATP/CaO composite, made up of ATP and CaO, possesses a micro/nanoporous structure, which is advantageous to control the release of FA. Since FA has a lot of hydroxyl (-OH) and carboxyl groups (-COOH), ACT, granulated by ATP/CaO and TWL, has a critical role in the immobilization of heavy metal ions [18,19]. In this work, Cu(II), Cd(II), and Pb(II) (CCP) were selected as representative heavy metal ions because of their high toxicity and large amounts [20][21][22].…”
Section: Introductionmentioning
confidence: 99%
“…6 The chemical and physiological activities of HAs are directly related to their molecular weight, structural character-istics, and the type and number of oxygen-containing functional groups. 7 HAs have many properties, such as exchange, adsorption, complexation, and chelation with metal ions, 8,9 and are widely used in the agriculture, 10−12 industry, 13 environmental management, 14−16 medicine, 17,18 and other fields. 19,20 Therefore, research on HAs is of great significance.…”
Section: Introductionmentioning
confidence: 99%
“…The humic substances in lignites are traditionally classified into three categories according to their alkaline and acid solubility, including alkali-insoluble, alkali-soluble, and acid-insoluble, and alkali- and acid-soluble components, corresponding to humin, humic acids, and fulvic acids, respectively. , HAs are rich in a variety of oxygen-containing functional groups such as carboxyl, hydroxyl, phenolic hydroxyl, carbonyl, methoxy, and so on . The chemical and physiological activities of HAs are directly related to their molecular weight, structural characteristics, and the type and number of oxygen-containing functional groups . HAs have many properties, such as exchange, adsorption, complexation, and chelation with metal ions, , and are widely used in the agriculture, industry, environmental management, medicine, , and other fields. , Therefore, research on HAs is of great significance.…”
Section: Introductionmentioning
confidence: 99%