Ecological aspects of study of carbon adsorbents and their characteristics depending on rice husk processing conditions

The industrial production and use of adsorption materials, especially carbon adsorbents, is steadily increasing every year worldwide. Natural coals and plant waste are used to produce activated carbon. One of the promising raw materials in the Republic of Uzbekistan for the production of activated carbon is rice husk, because of its renewability and cheapness. The paper highlights the results of the study of processing of rice husks to separate the main substances - activated carbon. Pre-carbonization of PW at 600°C with subsequent impregnation with KOH solution and further thermal activation at 1000°C is found to increase the specific surface of coal to 1286 m 2 /g, whereas for coal sample obtained by thermal activation of carbonizate. The specific surface is 1108 m 2 /g after impregnation with a KOH solution. In all temperature ranges of activation of the surface, the characteristic is greater in the first sample. Therefore, rice husks should be processed in a sequence: carbonization at 600°C, 20% carbonization of KOH solutions at 120°C within 2 hours, thermal and activation with water vapor at temperatures above 850°C, which ensures higher surface characteristics of the coal produced.