INVESTIGATIONS OF SORPTION PROPERTIES OF ACTIVATED ÑARBON FIBROUS MATERIALS
PART III. ADSORPTION OF ACTIVE CHLORINE AND CHLORINE DERIVATIVES

 
E.Scherbitskya,
  
V.M.Klevtsov,
 
V.Sergeev
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Omeliana Pritsaka str.,3, Kyiv, 03142, Ukraine
Nanostructural Material Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2013, #2
http://www.materials.kiev.ua/article/2023

Abstract

The results of the comparative study of chlorine and methylene blue hydrate ( marker of chlorinorganic compounds) adsorption by the samples of nanostructured activated ñarbon fibrous materials NACM (АВВМ “Днепр”-МН) and the material “Busofit T” have been shown. The relevance of the topic is determined by the large scale of chlorine and chlorinorganic compounds using as well as their high toxicity, because of which they are consider to be the dangerous environmental pollutants. One of effective methods of water purification is the adsorption. As a model of active chlorine used chlorine formed when the neutral calcium hypochlorite was dissolved in water (the active chlorine content in dry matter was 55%). Its experimental concentration in aqueous solutions was 25, 50 and 100 mg/l. Aqueous solutions (initial concentration of 150–1500 mg/l) of methylene blue were prepared from the salt with chemical formula C16H18N3SCl. Adsorption from solutions has been studied under static conditions on samples of NACM-25, NACM-41 and NACM-66 with 25%, 41% and 66% degrees of roasting and respectively, with different porous structure (VS = 0.32; 0.76; 0.98 cm3/g) and carbon fibrous material “Busofit T” with VS = 0.35 cm3/g. The porous structure of the sorbents was evaluated by absorption of benzene vapor. The content of chlorine in water was determined by iodometric, the content of MB – by colorimetric methods. The degree of extraction of the substance was calculated as well as the value of specific adsorption by the Freundlich equation. Have been established that the adsorption activity of the NACM samples toward chlorine and MB depends primarily on the degree of fine porous structure. Using the Freundlich equation were calculated the boundary values of sorption and adsorption equilibrium constants. The study of desorption indicates the chemical interaction between chlorine and carbon sorbent; part of MB is fixed on the surface of adsorbent by weak physical forces. Adsorption activity of NACM-66 with sorption pore volume (VS = 0,98 cm3/g) at 2.2–2.4 times exceeds the activity of NACM-25 (Vs = 0,32 cm3/g) and “Busofit T” (VS = 0.35 cm3/g) toward chlorine. The number of adsorption pores accessible for molecules of methylene blue increases when using the mesoporous adsorbents, namely NACM-41 (Vs = 0,76 cm3/g) and NACM-66 compared to NACM-25 and “Busofit T”. Full text download


CHLORINE, METHYLENE BLUE HYDRATE, NANOSTRUCTURED ACTIVATED CARBON FIBROUS MATERIAL, SORPTION, ХЛОРОРГАНИЧЕСКИЕ ЗАГРЯЗНИТЕЛИ ВОДЫ