Extraction and characterization of humic acid from coal for the application as dispersant of ceramic powders

Souza, Fabiana de; Bragança, Saulo Roca

doi:10.1016/j.jmrt.2017.08.008

Cited by 63 publications

(33 citation statements)

References 13 publications

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“…Graphite keeps stable during the heating process-from room temperature until 1000 • C-indicating high thermal stability. The degradation processes of HA, however, are divided into three steps: the weight loss at 50-175 • C is due to the moisture evaporation; 300 to 500 • C corresponds to the oxidation of the carbon chain and the removal of phenolics, alcohols, and aldehyde acids, along with the gaseous species, such as CO and CO 2 ; 720 to 830 • C corresponds to the decomposition of aromatic rings in HA structures [39]. The weight loss curves of the HA/graphite hybrid material pellets exhibit a similar trend with that of HA as there is HA embedded in the electrodes.…”

Section: Thermal Gravimetric Analysis (Tga)mentioning

confidence: 99%

Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

2019

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Humic acid (HA) is a biopolymer formed from degraded plants, making it a ubiquitous, renewable, sustainable, and low cost source of biocarbon materials. HA contains abundant functional groups, such as carboxyl-, phenolic/alcoholic hydroxyl-, ketone-, and quinone/hydroquinone (Q/QH2)-groups. The presence of Q/QH2 groups makes HA redox active and, accordingly, HA is a candidate material for energy storage. However, as HA is an electronic insulator, it is essential to combine it with conductive materials in order to enable fabrication of HA electrodes. One of the lowest cost types of conductive materials that can be considered is carbon-based conductors such as graphite. Herein, we develop a facile method allowing the biocarbon to meet carbon; HA (in the form of a sodium salt) is mixed with graphite by a solvent-free mechanochemical method involving ball milling. Few-layer graphene sheets are formed and the HA/graphite mixtures can be used to fabricate HA/graphite hybrid material electrodes. These electrodes exhibit a conductivity of up to 160 S·m−1 and a discharge capacity as large as 20 mAhg−1. Our study demonstrates a novel methodology enabling scalable fabrication of low cost and sustainable organic electrodes for application as supercapacitors.

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Section: Thermal Gravimetric Analysis (Tga)mentioning

confidence: 99%

Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

2019

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“…FTIR spectra showed the presence of aliphatic (bands 2900-2860 cm −1 , 1460 cm −1 ) and aromatic regions (1600 cm −1 ), thus the ratio of peak intensity at 1600 cm −1 to the sum of two peak intensities at 2900-2860 cm −1 and 1460 cm −1 could roughly represent the ratio of aromatic C to aliphatic C [22]. Wu et al [21] also found the ratio of the peak area of 1630 cm −1 to the peak area of 2930 cm −1 was positively correlated with the ratio of stable C to labile C, and this ratio was used as an indicator of SOM stability.…”

Section: Wave Numbers (Cm −1 )mentioning

confidence: 99%

Influences of Nitrogen Application Levels on Properties of Humic Acids in Chernozem Amended with Different Types of Organic Materials

et al. 2019

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The objective of this study was to examine the structure changes in humic acids (HAs) in Chernozem after the application of different types of organic materials (OMs) under an indoor simulation condition for plastic mulched drip irrigation, measured with Fourier transform infrared (FTIR) spectroscopy. The biotechnological extract of fulvic acid (BFA), decomposed sheep manure (M), corn straw pellets (Ps) and corn straw powder (Pr) were used as the four OMs for testing, and they were applied to Chernozem at the same amount of actual material; three nitrogen (N) levels (no N, low N, and high N supply) were applied to each type of (OMs), separately. The total culture period was set to 90 days and soil sampling was taken at 0, 30, 60 and 90 days, respectively. The results showed that different types of OMs exerted different effects on Chernozem based on the FTIR spectra of HAs. The application of M combined with high N supply was the best way to fertilize Chernozem, under which the H-bonded OH groups and aromatic compounds were enhanced, resulting in increased soil carbon (C) sequestration; while the carbohydrates in HAs was easily consumed as microbial energy substance. The HAs from the Chernozem amended with BFA became more aliphatic, simpler and younger. High N supply was beneficial for increasing the complexity of HAs from Chernozem amended with Ps, but was not conducive to soil cation retention. Within a short time of incubation, the application of Pr combined with high N was detrimental to the C sequestration in Chernozem, and inhibited the consumption of carbohydrates by microorganisms.

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“…Souza and Bragança noted that the FTIR spectra showed the presence of aliphatic (bands 2900-2860 cm −1 , 1460 cm −1 ) and aromatic components (1650 cm −1 ) [19]; thus, the ratio of the intensity at 1650 cm −1 to intensities at 2900-2860 cm −1 and 1460 cm −1 (from FTIR spectra) represented by the ratio c/(a + b + d) could roughly represent the ratio of aromatic C to aliphatic C. Wu et al also showed that the ratio between the integrated peak areas of 1650 and 2930 cm −1 positively correlated with the ratio of stable C to labile C and was used as an indicator of soil organic matter (SOM) stability [18]. As shown in Figure 2 and Table 2, with the incubation going on, the γ/(α + β+ δ) ratio of HAs increased gradually and then decreased, and finally, it was reduced.…”

Section: Ftir Spectra Of Has Extracted From the Chernozem Amended Witmentioning

confidence: 99%

Effects of Organic Material Types on Temporal Changes in Characteristics of Humic Acids Extracted from a Chernozem

et al. 2019

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Returning organic materials to fields is an effective management practice for improving soil quality in agroecosystems. In the case of scarce organic material resources, choosing the optimal material type for improving the quality of a soil type is an urgent problem to be solved. The objective of this study was to evaluate the temporal variations in the spectroscopic characterization of humic acids (HAs) over a period of 90 days after applying biotechnologically extracted fulvic acid (BFA), well-decomposed sheep manure (M), corn stover pellets (Ps) and corn stover powder (Pr) at equal C amount to a chernozem under laboratory conditions, measured by Fourier transform infrared (FTIR) spectroscopy and ultraviolet-visible spectrophotometry (UV–Vis). The results indicated that the BFA and Pr with higher C contents (68.9 and 59.8 g kg−1, respectively) were more beneficial to the C mineralization of HAs. M, applied in the largest amount, together with the highest available N, P, and K contents (575.4, 160.1, 478.9 mg kg−1, respectively), and its more easily consumed carbohydrates as well as well-decomposed status, was more likely to promote the condensation of HAs. BFA carried more hydrophilic groups into the HAs, while Ps did not introduce high levels of adsorbed H2O molecules and aromatic C=C (or C=O) groups. Ps did not affect the molecular structure of HAs after incorporation into the chernozem. At the equal C input amount, M had the greatest benefit, whereas the beneficial effect of Ps was the least, in improving the chernozem quality.

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Extraction and characterization of humic acid from coal for the application as dispersant of ceramic powders

Cited by 63 publications

References 13 publications

Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

Biocarbon Meets Carbon—Humic Acid/Graphite Electrodes Formed by Mechanochemistry

Influences of Nitrogen Application Levels on Properties of Humic Acids in Chernozem Amended with Different Types of Organic Materials

Effects of Organic Material Types on Temporal Changes in Characteristics of Humic Acids Extracted from a Chernozem

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