Establishment of a molecular structure model for classified products of coal-based fulvic acid

Gong, Guanqun; Zhao, Yuemin; Zhang, Yingjie; Deng, Bo; Liu, Weixin; Wang, Ming; Yuan, Xin; Xu, Liangwei

doi:10.1016/j.fuel.2020.117210

Cited by 23 publications

(19 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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 in the Digested Sludge and Their Properties

Anielak

Kłeczek

2022

Materials

View full text Add to dashboard Cite

Fulvic acids, alpha (α) humic acids and hymatomelanic acids were extracted digested sludge in two Cracow sewage treatment plants: Kujawy and Płaszów. Their elemental composition was examined and micropollution and ash content were determined. Based on the IR and UV-VIS spectrum, their similarities were determined with the occurring interactions with micropollution. Strong correlations between the acids coming from different sources depend on acid type and micropollution accompanying them, depending on concentration, influences to a specific extent their IR and UV-VIS spectra. Absorption analysis in infrared constitutes a simple method for characterizing fulvic and humic acids from wastewater treatment plants. The extracted fulvic acids were characterized by moderate maturity, while humus acids were well developed. In the fermentation process, the N bond increases together with the level of humification of the humus acid. The characteristics of the extracted humus acids comply with other humic substances presented in the literature. Quantitative analysis showed that digested sludge contains, on average: FA from 5.07 to 5.30 g/kg dry matter, αHA from 59.22 to 74.72 g/kg dry matter, HMA from 20.31 to 43.66 g/kg dry matter. It was thus demonstrated that wastewater treatment, in particular digested sludge, constitutes an attractive source of humus acids with a wide range of applications in numerous areas, such as agriculture, ecological rehabilitation, environmental protection, animal breeding, aquaculture, veterinary as well as medicine and is a precious source of soil fertilizers.

show abstract

Section: Introductionmentioning

confidence: 99%

Humus Acids in the Digested Sludge and Their Properties

Anielak

Kłeczek

2022

Materials

View full text Add to dashboard Cite

show abstract

“…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%

Tobacco Waste Liquid-Based Organic Fertilizer Particle for Controlled-Release Fulvic Acid and Immobilization of Heavy Metals in Soil

Wang

Yao

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Every year, a large amount of tobacco waste liquid (TWL) is discharged into the environment, resulting in serious pollution for the environment. In this work, a TWL-based particle (OACT) was fabricated by CaO, attapulgite (ATP), and TWL, and, then, OACT was coated by amino silicon oil (ASO) to form OACT@ASO. Therein, OACT@ASO had high controlled-release ability for fulvic acid (FA), because of the nanonetworks structure for ATP and the high content of FA in TWL. The release ratio (RR) of FA from OACT@ASO reached 94% at 75 h in deionized water, and 23% at 32 d in silica sand. Furthermore, the release mechanism of FA from OACT@ASO was consistent with the First-order law. Additionally, OACT@ASO also possessed high immobilization capacity for Cu(II), Cd(II), and Pb(II) (CCP) in soil. Notably, a pot experiment indicated that OACT@ASO could facilitate the growth of pakchoi seedlings and decrease the absorption of CCP by pakchoi seedlings. Thus, this study provides a new kind of organic fertilizer which could not only release FA, but also immobilize CCP in soil.

show abstract

“…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%

Exploration of the H₂O₂ Oxidation Process and Characteristic Evaluation of Humic Acids from Two Typical Lignites

Wang

Zhang

et al. 2021

ACS Omega

View full text Add to dashboard Cite

To study the effect of H 2 O 2 on the content and properties of humic acids (HAs) in lignites, the experimental conditions including oxidation time, H 2 O 2 concentration, and the solid−liquid ratio were investigated. Under the optimum oxidation conditions, the contents of HAs of YL and HB lignite were 45.4 and 40.9%, respectively. The HAs extracted from oxidized and raw lignites were characterized and compared. The results showed that the HAs extracted from oxidized lignites contain more total acidic groups, carboxyl groups, and aliphatic carbon than that in HAs extracted from raw lignites, and their hydrophilic−hydrophobic index value is higher and thermooxidative stability is better than those in HAs extracted from raw lignites. In addition, the composition of polycyclic aromatic hydrocarbons and fluorophore types in HAs extracted from oxidized lignites are similar to the HAs extracted from raw lignites. The results indicated that the oxidation operation can increase the content of HAs in lignites, and simultaneously increase the content of oxygen-containing functional groups and biological activity of HAs, which provided a reference for the subsequent application of HAs.

show abstract

Establishment of a molecular structure model for classified products of coal-based fulvic acid

Cited by 23 publications

References 29 publications

Humus Acids in the Digested Sludge and Their Properties

Humus Acids in the Digested Sludge and Their Properties

Tobacco Waste Liquid-Based Organic Fertilizer Particle for Controlled-Release Fulvic Acid and Immobilization of Heavy Metals in Soil

Exploration of the H₂O₂ Oxidation Process and Characteristic Evaluation of Humic Acids from Two Typical Lignites

Contact Info

Product

Resources

About

Establishment of a molecular structure model for classified products of coal-based fulvic acid

Cited by 23 publications

References 29 publications

Humus Acids in the Digested Sludge and Their Properties

Humus Acids in the Digested Sludge and Their Properties

Tobacco Waste Liquid-Based Organic Fertilizer Particle for Controlled-Release Fulvic Acid and Immobilization of Heavy Metals in Soil

Exploration of the H2O2 Oxidation Process and Characteristic Evaluation of Humic Acids from Two Typical Lignites

Contact Info

Product

Resources

About

Exploration of the H₂O₂ Oxidation Process and Characteristic Evaluation of Humic Acids from Two Typical Lignites