Preparation and Characteristics of a Cation Exchanger Based on Oxidized Anthracite

The features of anthracite oxidation as influenced by temperature and time were determined. Physicochemical and sorption characteristics of the resulting cation exchanger were studied.     

Synthesis and Study of Carbon Sorbent Prepared from Polyethylene Terephthalate

The optimal conditions for preparing activated carbons from polyethylene terephthalate polymer wastes were determined. The pore structure and sorption properties of the resulting product were studied.     

Preparation and Antimicrobial Properties of Chlorinated Carbon Materials

Antimicrobial preparations based on anthracite and carbon fabric and prepared by chlorination were studied as influenced by the moisture content of sorbent, its bulk weight, chlorination temperature, etc.     

Influence of Combined Treatment before Activation on the Development of Pore Structure of Anthracite

The influence of surface oxidation of anthracite with humid air, followed by impregnation with alkali metal compounds and calcination in inert atmosphere before activation, on the efficiency of steam-gas activation and on the development of the pore structure of the resulting carbon adsorbents was studied.     

Combined Activation of Anthracite

The effect of anthracite pretreatment on the production of activated carbons and increase in the specific porosity of the resulting adsorbent was studied.     

Effect of Thermochemical Treatment of Anthracite on Its Activation by Steam

The effect of thermochemical treatment of anthracite, including its oxidation, impregnation with a solution of a compound of an alkali metal, and heat treatment in an inert gas atmosphere on the subsequent activation of the material with steam was studied. It was shown that such treatment of anthracite leads to considerable improvement at the final stage of the production of active carbon; there is an increase (of almost three times) in the rate of activation (burn off) of the anthracite and better pore formation compared with the technology involving direct activation with steam.     

Activation and oxidation of carbon-based materials impregnated with potassium carbonate

Details are considered on the porous structure and oxidation of activated carbon-fiber tissue and anthracite in the presence of potassium carbonate. Specimens impregnated with K₂CO₃ show those processes of structuring and oxidation substantially accelerated. The time and temperature parameters required to produce highly porous sorbents and cation exchangers based on these carbon materials are much lower than those for the usual activation-oxidation process involving atmospheric oxygen. Institute for Sorption and Endoecology, National Academy of Sciences of Ukraine, 13 ul. Generala Naumova, Kiev 252164, Ukraine. Translated from Teoreticheskaya i éksperimental'naya Khimiya, Vol. 35, No. 5, pp. 306–310, September–October, 1999.     

Composite Sorbing Materials Based on Porous Carbon Powders

The possibility of synthesizing composite sorbing materials on the basis of porous carbon powders was studied. The sorption and porosimetric characteristics of the composites were examined.     

Sorption Characteristics of “Food Fibers” in Secondary Products of Processing of Vegetable Raw Materials

Some structural-sorption characteristics of a series of secondary products (wastes) obtained in processing of vegetable raw materials, such as wheat straw, buckwheat peel, sunflower husk, and beet pulp, containing fibrous cellulose skeleton (food fibers), were determined. The effect of chemical and mechano-chemical modification of these products on the characteristics of their pore structure and sorption activity with respect to organic substances, heavy metal ions, and ⁹⁰Sr radionuclides was studied.