The paper deals with a comparative study of equilibrium and kinetics of phenol adsorption from aqueous solutions by means of commercial activated carbons and semi-cokes, differing in the nature of feedstock, production technology and structural characteristics. The main adsorption parameters are calculated with the usage of Langmuir and Dubinin–Radushkevich equations. The change in the characteristics of the structure and state of the surface of semi-coke P2 as a result of modification is estimated. It was found that phenol adsorption kinetics is described by a pseudo-second-order model. The adsorption rate constants and the coefficient of external diffusion mass transfer are calculated. It is proved that phenol extraction from aqueous solutions presents a mixed-diffusion nature, and the process rate is limited by external mass transfer for 13 min for SKD-515 and 22 min for ABG. To increase the adsorption capacity, the oxidative modification of the semi-coke P2 was carried out. Considering the economic and technological aspects, ABG semi-coke is recognized as a promising sorbent for phenol extraction from aqueous media.

本文对通过商业活性炭和半焦吸附水溶液中苯酚的平衡和动力学进行了比较研究，其原料性质，生产工艺和结构特点各不相同。使用Langmuir和Dubinin–Radushkevich方程计算主要吸附参数。估计由于改性的结果，半焦炭P2的表面特征和结构特性的变化。发现苯酚的吸附动力学是由拟二级模型描述的。计算出吸附速率常数和外部扩散传质系数。事实证明，从水溶液中提取苯酚具有混合扩散特性，而处理速度受到外部传质的限制（SKD-515为13分钟，ABG为22分钟）。为了提高吸附能力，对半焦炭P2进行了氧化改性。考虑到经济和技术方面，ABG半焦被认为是从水性介质中提取苯酚的有前途的吸附剂。