EFFECT OF MODIFIERS ON THE STRUCTURAL FEATURES OF CARBONACEOUS COMPOSITE DURING CARBONIZATION OF PINE WOOD
Abstract
Porous carbonaceous materials from pine sawdust modified with FeCl3, ZnCl2 and H3PO4 have been synthesized. A comparative analysis of their structure and properties at different temperatures of carbonization and subsequent a treatment water has been carried out using thermal adsorption of nitrogen for determine of specific surface, electron microscopy and X-ray analysis.
It was revealed that homogeneous amorphous-crystalline structure of product is formed in heating of samples with H3PO4; carbonization of samples with FeCl3 leads to formation of crystalline phases including magnetite, but carbonization of samples with addition of ZnCl2 creates basic two phases – amorphous-crystalline and hexagonal crystallites of zinc oxide that impart special properties of the products.
It has been shown that the addition of ferric chloride allows to obtain magnetite/carbon composite having a specific surface area of 470 m2 g-1; the addition of zinc chloride in biomass leads to the formation of a zinc oxide/carbon composite having a specific surface of 1900 m2 g-1; and the addition of phosphoric acid results polyphosphate-carbon structure with a specific surface area up to 1300 m2 g-1. It has been revealed that the porosity of the product is associated mainly with the formation of the water-insoluble of crystal-like fragments for carbonization.Downloads
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