"To absorb these gases" means to take in or soak up the gases, typically to eliminate or reduce their presence in a particular area or substance. Full definition
They have a carbon filter to absorb the gas given off by the produce, a basket inside which helps with airflow, and a vent to control humidity. (52kitchenadventures.com)
In other words, the plant growth should act like a sink, absorbing the gas released into the air by burning fossil fuel. (scientificamerican.com)
The imperfections have unique electronic properties that the researchers were able to exploit to increase sensitivity to absorbed gas molecules by 300 times. (sciencedaily.com)