Abstract: A method is provided for generating data for use in calculating a desorption isotherm for an adsorbent material as well as a pore size distribution characteristic of the adsorbent material by flowing an adsorbate gas over a sample in a cell until the surface of the sample is saturated with the adsorbate, shutting off the flow of the adsorbate gas and then flowing a carrier gas through the cell to remove the adsorbate material from the surface of the sample while continuously detecting and recording per unit of time the composition of the gas mixture flowing from the cell and the sample temperature until only the carrier gas is detected.

Abstract: Activated carbon employed for removing weakly held contaminants such as organic chemicals from water, e.g., drinking water, can be recovered or regenerated by back flushing with iodine in water or an organic solvent and then the iodine recovered by reducing it to iodide and the iodide rinsed out of the carbon and reoxidized to iodine. The process can also be used to recover pure organic compounds adsorbed on the carbon.

Abstract: A cigarette filter containing menthol or other smoke-flavoring agent, and having improved shelf life and delivery rates for the smoke-flavoring agent, is obtained by first impegnating a granular activated carbon with a pore-modifying agent capable of blocking the most retentive portions of the activated carbon, by being held in preference to the smoke-flavoring agent which is added later. The pore-modifying agent is employed in amounts such that the less retentive portions of the activated carbon are not blocked but remain available for adsorption of the smoke-flavoring agent. A preferred pore-modifying agent is sucrose. Subsequently, the activated carbon is impregnated with the smoke-flavoring agent. The granular activated carbon is then formed into a filter.