Synthesis of activated coals with uniform pore structure

Фарберова, Е А; Тиньгаева, Е А; Maksimov, A. S.

doi:10.1134/s1070427215040047

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…The moisture, ash content and volatility of the samples were determined on a "Thermoster Eltra" thermogravimetric analyzer (according to ASTM D7582-12). The total pore volume, bulk density, pH of the aqueous extract, adsorption activity for methyl orange and methylene blue were determined in accordance with the procedures [12,13]. The adsorption characteristics of the sorbents (specific surface area) were studied by the Brunauer-Emmett-Teller (BET) method, measurements were carried out on a KATAKON Sorbtometer M. Chemical analysis and surface morphology were studied by energy dispersive X-ray spectroscopy using an SEM instrument (Quanta 3D 200i) with an EDAX energy dispersive analysis attachment.…”

Section: Obtaining Derivatives Of Humic Substances From Oxidized Coal and Study Of Physico-chemical And Adsorption Propertiesmentioning

confidence: 99%

Obtaining Derivatives of Humic Substances From Oxidized Coal and Study of Physico-Chemical and Adsorption Properties

Yermagambet¹,

Казанкапова²,

Muratbekovna³

et al. 2020

OF THE ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHSTAN JSC «D

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In the work, a chemical analysis of humic substances based on oxidized coal of the Maikuben basin (Kazakhstan) is carried out. Humic acids were obtained on the basis of potassium humates by acidification with a 20% acid solution to pH = 3-4.5. The optimal conditions for obtaining nitrohumic acids from oxidized coals are: the duration of the process is 3 hours, the ratio of S:L = 1:5, the content of nitric acid is 64%, sulfuric acid is 96% and the composition of the nitrating mixture is 1:1 (g/g). Amminohumic derivatives were obtained in the presence of a 3% aqueous solution of ammonia using mechanical activation and ultrasonic treatment. The samples obtained were tested as an adsorbent for water purification from heavy metals. Humic acids and aminohumate showed the highest degrees of purification for zinc (99.0-100.0%) and cadmium (80.0-96.7%), and nitrohumic acid showed a high adsorption capacity for heavy metals like copper - 100.0 % and lead 82.9%. This is due to the fact that when interacting with heavy metals, humic acids and their derivatives (amino and nitro) form chelate complexes due to carboxyl, phenolic, nitro and amino groups. As a result of the study, the possibility of using them as non-toxic available sorbents for the purification of heavy metals in aqueous media has been shown.

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Section: Obtaining Derivatives Of Humic Substances From Oxidized Coal and Study Of Physico-chemical And Adsorption Propertiesmentioning

confidence: 99%

Obtaining Derivatives of Humic Substances From Oxidized Coal and Study of Physico-Chemical and Adsorption Properties

Yermagambet¹,

Казанкапова²,

Muratbekovna³

et al. 2020

OF THE ACADEMY OF SCIENCES OF THE REPUBLIC OF KAZAKHSTAN JSC «D

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“…Исследованию процессов пиролиза фенолформальдегидных смол посвящен целый ряд работ. В работах [13,14] представлены результаты исследования процесса пиролиза фенолформальдегидной смолы (ФФС). Пиролиз проводили в интервале температур 360−1200 °С.…”

Section: методика экспериментаunclassified

Obtaining Granulated Active Carbon From Wastes of Vegetable Raw Materials

Фарберова¹,

Тиньгаева²,

Chuchalina³

et al. 2018

IVUZKKT

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In the processes of agricultural products production a sufficiently large amount of solid wastes which contain high molecular weight hydrocarbons such as lignin, cellulose, etc. is accumulated. However, such wastes are rarely used to produce active carbons, and only technologies with their use for obtaining crushed or powdered sorption materials are known. In the industrial production of granular activated carbon the fossil coals are mainly used. In this work, research was conducted on the development of methods for producing granulated active carbon of spherical form. And the characteristics of their porous structure were studied. The process of granulation of the spherical shape of sorbents was carried out by liquid dispersing composition containing pulverized wastes of vegetable origin and a binder. As plant materials we used walnut shells and peanuts, apricot seed, buckwheat husk, and for comparison, the dust caking coal of SSOM brand. As a binder a phenol formaldehyde resin was used. To remove volatile substances of plant the raw material was subjected to preliminary heat treatment without access of air in a muffle furnace at optimum temperature which was determined by thermogravimetry. Crushed carbon material was mixed with a binder component in a weight ratio of 1:5 and was sprayed into a solution of sulfuric acid with a concentration of 30-35% for the curing of the pellets. The obtained pellets were soaked in acid solution for 24-30 h, were separated from the liquid, were washed with distilled water to pH = 5-6, and were dried first in air and were subjected to heat treatment. The result of the research shows the possibility of regulation of characteristics of the porous structure of the spherical granular activated carbon depending on the plant material. The resulting spherical granules of activated carbon have developed system of micro - and mesopores. Depending on the type of plant waste the received active carbon has a radius of micropores in the range of (0.527-0.635) nm and maximum sorption volume varied from 0.46 to 0.71 cm3/g.Forcitation:Farberova E.A., Tingaeva E.A., Chuchalina A.D., Kobeleva A.R., Maximov A.S. Obtaining granulated active carbon from wastes of vegetable raw materials. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 3. P. 51-57

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