THE EFFECT OF OBTAINING CONDITIONS ON STRUCTURE AND SORPTION PROPERTIES OF ACTIVATED CARBONS FROM PINE BARK

The study resalts of the thermo-chemical transformations in pine bark carbonization process were presented. It was shown that thermo-alkaline activation of a carbonizat, obtained at 300 °C, allow synthesize active carbons with a specific surface 1511–1761 m2/g. The study results of influence КОН amount, using in an activation process of pine bark carbonizat, on the development of a porous structure and sorption properties of the active carbons are presented. Possibility of obtaining microporous or mezoporous active carbons at pine bark carbonizat to KOH ratio equal 1 : 2 – 1 : 3 and 1 : 4 – 1 : 5 respectively was shown. It was determined that mezoporous active carbons exceed microporous sfmpls at sorption capacity to middle molecular toxins in 3.5–11.7 times. It was shown that active carbon obtained at pine bark carbonizat to KOH ratio equal 1 : 5 exceed commercial enterosorbent CA – N from birch wood at sorption capacity to low- and middle molecular toxins. Therefore, the pine bark can be alternative raw material for prodaction of active carbons for medical and veterinary purposes.