EFFECT OF PRELIMINARY CARBONIZATION CONDITIONS OF LARCH BARK ON STRUCTURE AND SORPTION PROPERTIES OF ACTIVATED CARBONS SYNTHESIZED BY METHOD OF THERMAL-ALKALINE ACTIVATION
UDC 661.832.2:544.723
Abstract
The results of a study of the effect of temperature and heating rate in the process of preliminary carbonization of larch bark on the formation of a porous structure of carbonates and active carbons (AC), obtained in a result of activation of the carbonizats in the presence of potassium hydroxide, are presented. The possibility of a structure characteristics AC regulation by variation of the conditions of a larch bark preliminary carbonization was shown. It was determined, that AC based on carbonizats, obtained with heating rate 10 °C/min, have a microporous structure (the micropores part is 52.6–67.8%) and are characterized by a low sorption capacity at a methylene blue (38.3–273.1 mg/g) and a vitamin В12 (9.6–20.2 mg/g). The increase of heating rate up to 80 °C/min at carbonizats obtaining leads to increases in values of specific surface, total pores volume and micropores volume for AC on its base. It was determined that active carbons based on carbonates, obtained at 300 and 400 °C with a heating rate 80 °C/min, have the most developed porous structure (specific surface is 1746 and 2032 m2/g, pore volume is 0.85 and 0.94 cm3/g, respectively).This AC for their abilities to sorb iodine, methylene blue and vitamin В12 exceed commercial active carbon for medical purposes CA-N from birch wood.
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