scholarly journals Humic Substances Obtaining by Aerobic Biotreatment of the Mixture of Brown Coal and Aspen Wood Sawdust

2015 ◽  
pp. 45-52
Author(s):  
Ivan P. Ivanov ◽  
◽  
Yuriy L. Gurevitch ◽  
Anna O. Eremina ◽  
Valentina V. Golovina ◽  
...  
Keyword(s):  
Humic Substances ◽  
Brown Coal ◽  
Aspen Wood ◽  
Wood Sawdust

"PARAMETERS’ INFLUENCE OF CRUSHING BROWN COAL TO THE EXTRACTION OF HUMIC SUBSTANCES "

2017 ◽  
Vol 17 (6) ◽  
pp. 204-209
Author(s):  
K.S. Votolin ◽  
◽  
S.I. Zherebtsov ◽  
M.Y. Klimovich ◽  
O.V. Smotrina ◽  
...  
Keyword(s):  
Humic Substances ◽  
Brown Coal

Study of the Porous Structure and High Adsorption Capacity of Biomass-Based Activated Carbon Prepared from Aspen Wood by Ferric Nitrate III Activation

2021 ◽  
Vol 15 (2) ◽  
pp. 131-144
Author(s):  
Chunjiang Jin ◽  
Huimin Chen ◽  
Luyuan Wang ◽  
Xingxing Cheng ◽  
Donghai An ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Adsorption Capacity ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Mass Ratio ◽  
Aspen Wood ◽  
Surface Functional Groups ◽  
Wood Sawdust

In this study, aspen wood sawdust was used as the raw material, and Fe(NO3)3 and CO2 were used as activators. Activated carbon powder (ACP) was produced by the one-step physicochemical activation method in an open vacuum tube furnace. The effects of different mass ratios of Fe(NO3)3 and aspen wood sawdust on the pore structure of ACP were examined under single-variable experimental conditions. The mass ratio was 0–0.4. The detailed characteristics of ACP were examined by nitrogen adsorption, scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The adsorption capacity of ACP was established by simulating volatile organic compounds (VOCs) using ethyl acetate. The results showed that ACP has a good nanostructure with a large pore volume, specific surface area, and surface functional groups. The pore volume and specific surface area of Fe-AC-0.3 were 0.26 cm3/g and 455.36 m2/g, respectively. The activator played an important role in the formation of the pore structure and morphology of ACP. When the mass ratio was 0–0.3, the porosity increased linearly, but when it was higher than 0.3, the porosity decreased. For example, the pore volume and specific surface area of Fe-AC-0.4 reached 0.24 cm3/g and 430.87 m2/g, respectively. ACP presented good VOC adsorption performance. The Fe-AC-0.3 sample, which contained the most micropore structures, presented the best adsorption capacity for ethyl acetate at 712.58 mg/g. Under the action of the specific reaction products nitrogen dioxide (NO2) and oxygen, the surface of modified ACP samples showed different rich C/O/N surface functional groups, including C-H, C=C, C=O, C-O-C, and C-N.

RHEOLOGICAL PROPERTIES OF HUMIC SUBSTANCES OF PEAT AND BROWN COAL

2021 ◽  
pp. 169-174
Author(s):  
Ivan I. Lishtvan ◽  
Vera N. Aleinikova
Keyword(s):  
Rheological Properties ◽  
Humic Substances ◽  
Structure Formation ◽  
Humic Substance ◽  
Brown Coal ◽  
Oil Wells ◽  
Alkaline Media ◽  
Rheological Parameters ◽  
Acid Media ◽  
Brown Coals

Knowledge about structure and rheological peculiarities of drilling solutions and reagents applied for the proceeding of oil wells has significant value for the forecasting of oil wells drilling. The research results of the structure of the humic substances of peat and brown coals precipitated in different pH ranges from the standpoint of their ability to structure formation on the base of the rheological curves obtaining of the flow of their dispersions and determining of their rheological parameters in terms of their application in drilling practice are given in the article. It is established that during transition from fraction, beset into alkaline media (12.0–8.5) to fraction beset into acid media (5.0–2.0) the decrease of the rheological indicators of caustobiolate humic substance is occurred. Rheological curves of the flow of the disperse of caustobiolate humic substances of the fraction 1 and 2 are characterized for strong fossil structures, disperses of humic substances of the fraction 3 is for less strong coagulation structures. Less structured are humic substances of brown coal so that their use is preferable for the regulation of the structure and rheological peculiarities of drilling solutions.

scholarly journals EFFECT OF THE ACIDIC TREATMENT OF DOMESTIC WOOD RESIDUE ON BIOCOMPOSITE WETTABILITY AND MOISTURE SORPTION PROPERTIES

2017 ◽  
Vol 1 ◽  
pp. 129
Author(s):  
Jevgenijs Jaunslavietis ◽  
Galia Shulga ◽  
Jurijs Ozolins ◽  
Brigita Neiberte ◽  
Anrijs Verovkins ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Free Energy ◽  
Dilute Hydrochloric Acid ◽  
Moisture Sorption ◽  
Treatment Temperature ◽  
Aspen Wood ◽  
Wood Residue ◽  
Wood Sawdust ◽  
Wood Polymer ◽  
Wood Polymer Composites

The aim of the work was to evaluate the effect of the acidic treatment temperature of aspen sawdust as a filler on the moisture sorption, wetting and mechanical properties of wood-polymer composites. Aspen wood sawdust was treated with the dilute hydrochloric acid solution at 60oC and 90oC during 5 h. Both the treated particles and the filled composites were studied in terms of moisture sorption and wettability; their surface free energy was calculated using the Owens-Wendt-Rabel-Kaelble (OWRK) approach. The obtained results have shown that the acidic treatment of aspen wood sawdust at 90oC leads to an increase in its hydrophobicity that decreases the wettability and moisture sorption of the obtained composite and increases its mechanical properties.

scholarly journals Temperature Dependences of IR Spectra of Humic Substances of Brown Coal

Agronomy ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1822 ◽  
Author(s):  
Dmitry S. Volkov ◽  
Olga B. Rogova ◽  
Mikhail A. Proskurnin
Keyword(s):  
Organic Matter ◽  
Ir Spectra ◽  
Humic Substances ◽  
Brown Coal ◽  
Functional Dependence ◽  
Maximum Temperature ◽  
Experimental Conditions ◽  
Band Shift ◽  
Single Temperature ◽  
Temperature Dependences

The capabilities of temperature-monitored IR spectroscopy for studying the organic matter and mineral composition of humic substances (HS) were tested. Temperature dependences of the mid-IR spectra of humic substances heated in the air in the range 25–215 °C (298–488 K, with a step of 2.5 °C)—for three commercially available samples isolated from brown coal (leonardite)—were performed. The characteristic bands were identified, and their changes in band maxima positions and intensities were compared. From the viewpoint of interpretation of HS components, the spectra were divided into regions of quartz lattice region (800–260 cm−1), quartz overtone region (1270–800 cm−1), humic substance organic matter region (1780–1270 cm−1), quartz combination region (2800–1780 cm−1), CH-speciation region (3100–2800 cm−1), and hydrogen-speciation region (4000–3100 cm−1) thus selected to contain the dominating type of bands. For the first time, a reversible change in the frequencies of the band maxima in IR spectra upon heating was observed, which can be interpreted as forming structures with a particular order in the studied humic substances in the dry state. For a single sample, both the band-shift scale and the functional dependence of the various bands on temperature differ significantly. The approach differentiates crystalline quartz bands, amorphous silica, and HSOM/surface groups experiencing a different temperature behavior of the band maxima and their intensities. Band-maximum temperature dependence can be considered more stable to changes in experimental conditions than band maxima at a single temperature, thus providing a more detailed HS structure analysis without HS decomposition or destruction.

Composition of humic substances in oxidized brown coal from Mongolia

2010 ◽  
Vol 44 (2) ◽  
pp. 78-88 ◽  
Author(s):  
L. N. Novikova ◽  
R. Erdenechimeg ◽  
B. Purevsuren ◽  
T. I. Vakul’skaya ◽  
D. F. Kushnarev ◽  
...  
Keyword(s):  
Humic Substances ◽  
Brown Coal

Biocrude production via supercritical hydrothermal co-liquefaction of spent mushroom compost and aspen wood sawdust

2017 ◽  
Vol 111 ◽  
pp. 392-398 ◽  
Author(s):  
Lukas Jasiūnas ◽  
Thomas H. Pedersen ◽  
Saqib S. Toor ◽  
Lasse A. Rosendahl
Keyword(s):  
Aspen Wood ◽  
Mushroom Compost ◽  
Spent Mushroom Compost ◽  
Wood Sawdust

scholarly journals Value-Added Products From Soil, Brown Coal, and Composted City Solid Waste

2021 ◽  
Vol 5 ◽  
Author(s):  
S. V. Eswaran
Keyword(s):  
Humic Substances ◽  
Brown Coal ◽  
Materials Science ◽  
Dye Sensitized Solar Cells ◽  
Value Added ◽  
Environmental Cleaning ◽  
Dye Sensitized ◽  
Growth Promotants ◽  
Sensitized Solar Cells ◽  
Value Added Products

This review article highlights alternative innovative uses of soil, brown coal, and composted solid city waste. The latter leads to environmental pollution, which can be addressed by using these materials to generate value-added products. Humic substances present there can be isolated in large amounts and used in diverse fields like sustainable agriculture, horticulture, biomedicine, and materials science. These have been shown to be non-toxic and safe for humans and serve as growth promotants for plants and to cure stomach ailments. The recent discovery of their antiviral/anti-HIV-AIDS activity is described here in some detail. The use of humic substances for making dye-sensitized solar cells (DSSCs) and for preparing a catalyst for reduction and for oxidation processes is also highlighted. Such innovative uses of humic substances can lead to environmental cleaning and positively impact climate change.

Transformation of humic substances of highly oxidized brown coal by basidiomycetes Trametes hirsuta and Trametes maxima

2013 ◽  
Vol 49 (3) ◽  
pp. 287-295 ◽  
Author(s):  
O. I. Klein ◽  
N. A. Kulikova ◽  
A. I. Konstantinov ◽  
T. V. Fedorova ◽  
E. O. Landesman ◽  
...  
Keyword(s):  
Humic Substances ◽  
Brown Coal ◽  
Trametes Hirsuta
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