Based on the experience from the storage and operation of the gas masks canisters and filter canisters for collective protection, an overview has been made of one of the main disadvantages of the gas mask carbons used of type ASC Whetlerite, the declining of their protective properties as a result of the “aging’ process. The “aging’ factors of the gas mask carbons have been considered and mechanisms adopted for deactivation of their active phases. It has been demonstrated that the inclusion of ТЕDА and derivatives of pyridine in the active phase of the gas mask carbons of the type ASC Whetlerite, only partially solves the problem with the increase of the robustness against “aging” in the conditions of increased atmospheric humidity in operation and storage and for the overall solution, gas mask carbons need to be developed based on impregnation compositions other than of the ASC Whetlerite.
Author: Athanasios P. Chatzis
Among the methods for the contaminated water treatment for removing heavy metal ions, including those of T1, the most widely used are the adsorption methods, and among the sorbents used, the different types of carbon materials. The analysis of the metal ion sorption mechanisms from aqueous solutions of carbon materials shows the essential role of surface oxygen groups present in all carbon materials (commercial products) for the sorption process. In the presented publication, the possibility was investigated through liquid phase oxidation with nitric acid to prepare oxidized carbon materials which differ both in the parameters of the adsorption texture and the content of surface oxygen groups on the carbon surface. The efficiency of the modified samples prepared by liquid phase oxidation for Tl ions sorption from aqueous medium was investigated by adsorption process. Increased sorption possibilities were observed towards Tl ions as compared to initial carbon materials.