Tag:carbonic sorbent

 

№8|2010

POTABLE WATER SUPPLY

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UDC 628.162.1

Filatova E. G., Dudarev V. I., Syrykh Yu. S., Nguen Ngok An Tuan

Extraction of Iron Ions (II) from Aqueous Solutions with Carbonic Sorbents

SUMMARY

The absorbing capacity of carbonic sorbents of ИПИ-Т mark regarding iron ions (II) has been studied. Sorbents on the basis of carbonated polymer materials stable to aggressive media, have a developed specific surface area, inexpensive. Isotherms of adsorption under static conditions at temperature of 298 K have been obtained. The isotherm of adsorption is described satisfactorily by the Langmuir equation. Results of the study shows that carbonic sorbents of ИПИ-Т mark are able to sorb iron ions (II), in the process, a sorption capacity is 0,24 mole/g. The kinetics of the process has been studied, thermodynamic parameters of sorption have been determined. The sorption method of treatment with the use of sorbents of ИПИ-Т can be economically sound. Сarbonic sorbents are perspective for selective extraction of iron ions (II) from industrial wastewater.

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№7|2022

DRINKING WATER SUPPLY

DOI 10.35776/VST.2022.07.03
UDC 544.723

Krasnova Tamara, Belyaeva Ekaterina, Belyaeva Oxana, Gora Natalia, Ivanova Liudmila

The use of carbon sorbents to remove manganese from aqueous media

Summary

The work is devoted to the study of manganese adsorption from aqueous solutions by carbon materials. The data on the concentration of manganese compounds in the surface and underground waters of the Kemerovo Region, as well as possible sources of its entry into natural waters are given. A brief analysis of the proposed methods of water demanganation is given. The experimental results of the studies of Mn (II) extraction from aqueous media under equilibrium conditions with carbon sorbents of different price categories, differing in the raw materials, production technology, technical characteristics and chemical state of the surface, are presented. It has been established that the greatest amount of manganese is extracted by ABG sorbent. The obtained adsorption isotherms were analyzed using the theories of monomolecular adsorption (Freundlich and Langmuir equations); and the main adsorption parameters were calculated. It is determined that the Langmuir model describes manganese adsorption isotherms with a lower correlation, which allows to assume manganese adsorption on heterogeneous adsorption centers. The approximate consumption of the sorbent required to remove manganese from water to the standard values was estimated. Per totality of the data obtained for the demanganation of natural waters, a carbon sorbent is proposed characterized with the high adsorption capacity in relation to manganese and coupled with the low cost.

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№1|2014

WASTEWATER TREATMENT

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UDC 628.316.12:546.72

Filatova E. G., Pomazkina O. I., Dudarev V. I., Soboleva A. A.

Removing iron with carbon sorbent from plating wastes

Summary

The results of investigating adsorption capacity of sorbents in relation to iron ions (III) under static and dynamic conditions (with the use of isotherms and kinetic adsorption curves) are presented. To provide for removal of iron ions (III) and tertiary treatment of plating wastes IPI-T activated carbon was used that was produced from the wastes of phenol-formaldehyde resin production and modified with sulfosalicylic acid for IPI-Tm sorbent production was used. The maximum rate of sorbate passing through the sorbent layer was 5–7.5 ml/min which corresponded to the linear velocity of 1.5–2 m/h under full-scale conditions. The main factor that affects the sorption process is pH with optimal value of 1.79. Constants of BET adsorption equation for IPI-Tm modified sorbent were determined. The limiting sorption capacity of the monolayer was 128 mmol/kg, for IPI-T sorbent – 20.8 mmol/kg, limiting adsorption А∞ – 100 mmol/kg, adsorption equilibrium constant – 1·104; at that standard Gibbs energy of adsorption was 22.819 kJ/mol. Under dynamic conditions the time of the protective effect of IPI-Tm sorbent was 4 hours, i. e. 2 hours longer compared to IPI-T sorbent, and the volume capacity for IPI-Tm was 7.2 mg/l, i. e. twice as high as that for IPI-T.

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№8|2024

WASTE MANAGEMENT

UDC 676.082.2:676.084.5:54-414
DOI 10.35776/VST.2024.08.05

Arduanova Anna, Glushankova Irina

Development of a method for producing carbon sorbents by thermochemical pyrolysis of liquid cellulose waste

Summary

In the process of high-quality cardboard and newsprint production, cellulose is used prepared by thermal treatment of hardwood or softwood with cooking solutions based on alkali metal sulfites or bisulfites. As a result, spent cooking liquors containing lignosulfonates and lignosulfonic acids are generated that are subject to concentration by evaporation. A method is presented for producing carbon sorbent from evaporated liquor in the presence of an activator – potassium hydroxide; the method involves thermochemical pyrolysis of the raw material. It has been established that the developed method provides for one-stage production of carbon sorbents with properties comparable to engineering grades of active carbon. Tertiary treatment of pulping wastes by adsorption to remove lignosulfonates using active carbons of AG-3, BAU grades and carbon sorbents based on liquid lignosulfonates was studied. The obtained adsorption isotherms have allowed to establish that the carbon sorbent samples are applicable for removing organic compounds – lignosulfonates from water. A basic process flow scheme for the utilization of lignin-containing wastes with the production of sorption materials by thermochemical pyrolysis has been developed.

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Журнал ВСТ включен в новый перечень ВАК

Шлафман В. В. Проектирование под заданную ценность, или достижимая эффективность технических решений – что это?

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