The modified forms  of bentonites from the Ali-Bayramli deposit  were received by way of  their treatment  with salt of the different metals, and their  nature, quantity and force of basic centres on their surfaces have been researched by absorption of the carbon monoxide by the method of derivatography. As a result of the investigation, it was determined that  Сo²⁺- bentonite has the most ability of absorption of the carbon monoxide molecules and also it is possible to use it as sorbent   preventing  pollution of the environment by carbon monoxide