Processing of Brown Coals Into Effective Sorbents for Solv-Ing Problems of Environmental Protection and Improving the Quality of Life

Kozlov, А. P.; Zykov, I. Yu.; Dudnikova, Yu. N.; Tsvetkov, V. E.; Федорова, Н. И.; Исмагилов, З. Р.

doi:10.26730/1999-4125-2018-3-93-100

Cited by 6 publications

(1 citation statement)

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“…It is established that from the considered chemical reagents the alkali metal hydroxides have the most effective influence on adsorption activity of the Kharanorsk lignite samples. The effectiveness of fossil coals activation by alkali metal hydroxides (LiOH, NaOH, KOH) for obtaining carbon materials with high parameters of porous structure has been confirmed by a number of studies [8][9][10][11][12][13][14][15][16][17]. In addition to the porous structure development, the alkali provides a high proportion of micropores, a narrow distribution of pores size and significantly reduces the porous material ash content due to the reaction with the mineral components of the starting raw materials.…”

Section: Chemical Activation (Stage 1)mentioning

confidence: 99%

Research of efficiency of lignite chemical modification and steam-gas activation combining for sorbents preparation*

et al. 2020

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The paper presents the results of research for sorbents preparation when combining the processes of chemical modification and steam-gas activation of lignite from the Kharanorsk deposit (Zabaikalsky Krai). The experimental studies were carried out by two ways of activation methods combination: parallel and successive exposure on feedstock. The lignite processed by chemical reagent (KOH) was exposed to steam during the whole period of thermolysis under the parallel action. Under successive exposure, the thermolysis was performed in two stages - first without steam supply, then with steam-gas activation. In the work the optimal parameters of the process of combining the chemical and steam-gas lignite activation methods were determined and the quality of the generated sorbents was studied. The efficiency of combined activation was estimated by comparing the sorption characteristics of the samples with the results obtained during chemical and steam-gas activation as autonomous processes and with the requirements to these characteristics of industrially produced active carbon grades. Combined activation of lignite allowed to increase the value of iodine adsorption activity in comparison with autonomous steam-gas activation by 1.8-2 times, chemical activation - by 2.7-10 %. The obtained values of iodine adsorption activity at combination of chemical modification and steam-gas activation exceed the value of 100 % (1000 mg/g) that meets the requirements to high quality industrially produced active carbons of SKT-0 grade.

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Section: Chemical Activation (Stage 1)mentioning

confidence: 99%

Research of efficiency of lignite chemical modification and steam-gas activation combining for sorbents preparation*

et al. 2020

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Determination of the parameters of the porous structure of carbon sorbents based on Kuzbass fossil coals by the method of low-temperature nitrogen adsorption

Dudnikova

Zykov

Созинов

et al. 2021

J. Phys.: Conf. Ser.

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The paper presents a technique for measuring the parameters of the porous structure of carbon sorbents obtained on the basis of Kuzbass fossil coals using an ASAP 2020 “Micromeritics” analyzer. The conditions for sample preparation were selected, which make it possible to record reproducible isotherms of low-temperature adsorption-desorption of nitrogen (77K) by the studied samples of carbon sorbents based on fossil coal of various grades. The textural characteristics of the porous structure of carbon sorbents were determined, such as the specific surface area (SBET, m2/g), the total pore volume (VΣ, cm3/g), the volume of micro-and mesopores (Vmicro, Vmeso, cm3/g) of the studied carbon sorbents. The textural characteristics of the porous structure of carbon sorbents were calculated from the obtained isotherms of low-temperature (77K) nitrogen adsorption-desorption. The textural characteristics of carbon sorbents were calculated by various methods implemented by the software of the ASAP 2020 analyzer “Micromeritics”: BET, Langmuir, DFT, t-Plot, Dubinin-Radushkevich, Dubinin-Astakhov, MP-method, Horvath-Kawazoe, BJH and Dollimore-Heal. The obtained values of the textural characteristics of the porous structure of carbon sorbents, calculated by various methods, make it possible to obtain more detailed information about the objects of study and to determine the scope of their further application.

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Study of the structure and morphology of carbon sorbents

Zykov

Dudnikova

Федорова

et al. 2021

J. Phys.: Conf. Ser.

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The paper presents the results of a study of the morphology of carbon sorbents from Kuzbass coal. Carbon sorbents were obtained by chemical activation of the initial coal with potassium hydroxide at a temperature of 800 °C and a KOH/coal ratio of 1 g/g. It was shown that alkaline activation has no significant effect on the ash content of the obtained carbon sorbents. The elemental composition of the obtained carbon sorbents practically does not differ and remains constant when the elemental composition of the initial coal changes. The morphology of the surface of the initial coal and sorbents was studied by the SEM method, and the different nature of the surface of carbon sorbents based on coal was shown. For carbon sorbents from bituminous coals of low stages of metamorphism, a spongy structure is characteristic, for carbon sorbents from bituminous coals of high stages, it is layered. The physicochemical characteristics of carbon sorbents were determined. A study was carried out for the content of total and water-soluble iron for the amount of water-soluble ash.

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Processing of Brown Coals Into Effective Sorbents for Solv-Ing Problems of Environmental Protection and Improving the Quality of Life

Cited by 6 publications

References 0 publications

Research of efficiency of lignite chemical modification and steam-gas activation combining for sorbents preparation*

Research of efficiency of lignite chemical modification and steam-gas activation combining for sorbents preparation*

Determination of the parameters of the porous structure of carbon sorbents based on Kuzbass fossil coals by the method of low-temperature nitrogen adsorption

Study of the structure and morphology of carbon sorbents

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