The role of various compounds in humic acids stability studied by TG and DTA

Kučerík, Jiří; Kamenářová, D.; Válková, Dana; Pekař, Miloslav; Kislinger, J.

doi:10.1007/s10973-005-7540-8

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…According to Stevenson [ 2 ], the molecular weights of humic substances range from 500 to 5,000 Da for fulvic acids and from 3,000 to 1,000,000 Da for humic acids. To contribute to the structural elucidation of humic substances, Kucerik et al [ 5 ] performed thermogravimetric analyses of diverse humic substances and found different profiles of combustion, which are compatible with the structural complexity reported by Stevenson [ 2 ].…”

Section: Humified Matter Vermicompost and Vermicomposting Processupporting

confidence: 54%

An Overview of the Environmental Applicability of Vermicompost: From Wastewater Treatment to the Development of Sensitive Analytical Methods

Pereira

Neta

Fontes

et al. 2014

The Scientific World Journal

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The use of vermicompost (humified material) for treating wastewaters, remediating polluted soils, improving agricultural productivity, protecting crop production, and developing sensitive analytical methods is reviewed here, covering the past 17 years. The main advantages of vermicompost, considering all applications covered in this paper, comprise (i) easy acquisition, (ii) low costs, (iii) structural, chemical, and biological characteristics responsible for exceptional adsorptive capacities as well as pollutant degradation, and (iv) the promotion of biocontrol. Specifically, for wastewater decontamination, a considerable number of works have verified the adsorption of toxic metals, but the application of vermicompost is still scarce for the retention of organic compounds. Problems related to the final disposal of enriched vermicompost (after treatment steps) are often found, in spite of some successful destinations such as organic fertilizer. For decontaminating soils, the use of vermicompost is quite scarce, mainly for inorganic pollutants. In agricultural productivity and biocontrol, vermicompost imparts remarkable benefits regarding soil aggregation, plant nutrition, and the development of beneficial microorganisms against phytopathogens. Finally, the use of vermicompost in sensitive analytical methods for quantifying toxic metals is the newest application of this adsorbent.

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Section: Humified Matter Vermicompost and Vermicomposting Processupporting

confidence: 54%

An Overview of the Environmental Applicability of Vermicompost: From Wastewater Treatment to the Development of Sensitive Analytical Methods

Pereira

Neta

Fontes

et al. 2014

The Scientific World Journal

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“…The TG/DTG curves reported in Figure A confirm those findings. In fact, region II in biomass thermograms is usually due to the thermo-oxidative degradation of labile alkyl systems, carbohydrates, and fatty acids. , Conversely, region III is mainly assigned to mass loss of more recalcitrant aromatic moieties. , The latter come from original structures and, partially, from structures that developed in previous stages during the degradation and recombination of aliphatic molecules . In particular, the highly oxygenated degree of the organic PM systems favors mass loss at the temperature of 286 °C in region II (Figure A).…”

Section: Results and Discussionmentioning

confidence: 99%

“…47,49 The latter come from original structures and, partially, from structures that developed in previous stages during the degradation and recombination of aliphatic molecules. 50 In particular, the highly oxygenated degree of the organic PM systems favors mass loss at the temperature of 286 °C in region II (Figure 3A). Conversely, the larger chemical stability of aromatic systems is responsible for the thermal degradation at the temperature of 460 °C as evidenced in region III (Figure 3A).…”

Section: ■ Introductionmentioning

confidence: 97%

“…52 Due to this, the surficial nonaromatic components are degraded first during the TG investigation. The stable products obtained by this first degradation step 50,53 protect the inner aromatic constituents toward the thermo-oxidative degradation, thereby decelerating the effective heat flow and preventing the char particles from penetration of reactive atmosphere. 54 Conversely, the polyaromatic domain in the 600 °C PM chars is degraded at a lower temperature (≈400 °C in Figure 3C) than the other chars due to the absence of the protective effect of the nonaromatic components.…”

Section: ■ Introductionmentioning

confidence: 99%

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Effect of Heating Time and Temperature on the Chemical Characteristics of Biochar from Poultry Manure

Cimó

Kučerík

Berns

et al. 2014

J. Agric. Food Chem.

112

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Poultry manure (PM) chars were obtained at different temperatures and charring times. Chemical-physical characterization of the different PM chars was conducted by cross-polarization magic angle spinning (CPMAS) (13)C NMR spectroscopy and thermal analysis. CPMAS (13)C NMR spectra showed that the chemical composition of PM char is dependent on production temperature rather than on production duration. Aromatic and alkyl domains in the PM chars obtained at the lowest temperatures remained unchanged at all heating times applied for their production. The PM char obtained at the highest temperature consisted only of aromatic structures having chemical nature that also appeared invariant with heating time. Thermogravimetry revealed differences in the thermo-oxidative stability of the aromatic domains in the different PM chars. The PM char produced at the highest temperature appeared less stable than those produced at the lowest temperatures. This difference was explained by a protective effect of the alkyl groups, which are still present in chars formed at lower temperature. The analysis of the chemical and physicochemical character of poultry manure chars produced at different temperatures can increase understanding of the role of these materials in the properties and behavior of char-amended soils.

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“…the kinetics of the physicochemical processes during decomposition [16][17][18][19][20]. It is performed for humic substances both to measure its moisture and ash contents and to monitor and characterize structural changes during the heating process.…”

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confidence: 99%

Characterization and kinetics analysis of the thermal decomposition of the humic substance from hazelnut husk

Kara¹,

AdigÜzel²,

Atmaca³

et al. 2020

Turk J Chem

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Introduction Humic substances are one of the most important components of soil. They form a large part of the organic matter in the soil and play an effective role in its producibility. Humic substances have a macromolecular and complex structure. They consist of the chemical and biological degradation of animal and plant residues in soil, water, and sediments, so they can be obtained from any source of organic matter [1,2]. Many studies have been performed to attain humic substances from biological wastes [3-7]. They can exist in different ambients; for example soils, natural waters, rivers, lakes, sea sediment plants, and composts, but it has been observed that the chemical properties, quantities, and proportions of humic substances obtained from wastes can vary according to their sources [8-10]. There is no consensus on the structural and chemical properties of the final product to be obtained from humic substances [11]. Apart from agricultural fields, there are many different uses for humic substances, such as a dispersant in ceramic suspensions, wastewater treatment as an adsorbent, drilling fluids, medicine and creams for the treatment of various diseases, lead acid batteries as surfactant material, etc. [12]. However, they do not have certain or identified structures and features, depending on their sources and extraction conditions. Although they are chemically heterogeneous compounds with different proportions and configurations of functional groups, they comprise elements, especially C, H, N, O, and S, and the carboxyl (-COOH), amine (-NH 2), hydroxyl (-OH), and phenol (Ar-OH) functional groups [13]. Alkali humates are obtained from extraction processes with alkaline solutions (NaOH, KOH solutions, etc.) of humic substance sources. They are known as water-soluble salts of humic acid and have many benefits, such as expediting plant growth/development and enhancing plant resistance against unsuitable ambient situations. Moreover, it has been stated that the preoxidation step increases the extraction efficiency of humic acid [14,15]. Thermal analysis [TG analysis-differential thermogravimetry/differential scanning calorimetry (TG/DTG-DSC)] is often utilized to describe the thermal stability or behavior of humic substances under various conditions and to investigate Abstract: A humic substance was obtained from hazelnut husk using an alkali extraction. The chemical and morphological structure of the humic matter was characterized via elemental analysis, Fourier transform infrared spectrometry (FTIR), nuclear magnetic resonance, Brunauer-Emmet-Teller (BET) analysis, scanning electron microscopy (SEM), and thermogravimetric-FTIR (TG-FTIR). In addition, thermal analysis measurements TG analysis-differential thermogravimetry/differential scanning calorimetry (TGA-DTG/ DSC) were performed under dynamic air conditions to better determine the origin, physical and chemical structure, and decomposition process of the humic matter. The Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods were used to cal...

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The role of various compounds in humic acids stability studied by TG and DTA

Cited by 10 publications

References 12 publications

An Overview of the Environmental Applicability of Vermicompost: From Wastewater Treatment to the Development of Sensitive Analytical Methods

An Overview of the Environmental Applicability of Vermicompost: From Wastewater Treatment to the Development of Sensitive Analytical Methods

Effect of Heating Time and Temperature on the Chemical Characteristics of Biochar from Poultry Manure

Characterization and kinetics analysis of the thermal decomposition of the humic substance from hazelnut husk

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