Effect of the Preparation Conditions of Carbon Fiber Adsorbents on Their Adsorption Capacity

Resumo

Carbon fiber adsorbents based on hydrated cellulose fiber, in which the transport porosity is absent, due to which the micropores become readily accessible towards adsorptive molecules have been studied. The aim of this work is to study the influence of the conditions of sorbent synthesis on their adsorption properties. The state of the surface of pristine carbon fiber has been determined, and the porous structure of activated carbon fibers has been estimated. It has been found that, when activating the cloth with a temperature of heat treatment of 1070–1270 K, it becomes possible to obtain the adsorbent with good molecular-sieve characteristics, although with the relatively small micropore volume. It has been suggested that it is linked with the restructuring of the carbon fiber structure that takes place at the activation temperature in cloths. During the study, it has been experimentally found and confirmed that the adsorption properties of sorbents obtained differ depending on the synthesis conditions and the surface state.