Graphitization of olive mill waste biomass by pyrolysis for H2, CH4 and CO2 gas detection

A graphitized adsorbent of CO2, CH4 and H2 gases is prepared from pre-treated olive mill waste using pyrolysis method under N2 atmosphere. This organic adsorbent is found to have a large surface area of 1571 m2/g and high pore volume of 1.04 cm3/g. The isotherms analysis by using Brunauer-Emmett-Teller (BET) method revealed that the aforementioned adsorbent exhibits mesopore structure coexisting with a microporous framework. Thanks to these textural properties, gases uptakes of this adsorbent at 298 K and 20 bars reach 5.62, 12.72 and 0.08 mmol/ g for CH4, CO2 and H2, respectively, which are among the highest levels compared to other solids (zeolites, metal organic framework). The adsorption-desorption cycles performed for CH4, CO2 and H2 gases were found to be reversible indicating a possible and easily regeneration of the adsorbent. Considering all these advantages about low costs graphitization, great uptake of various gases, good physicochemical stability and reversibility, this adsorbent can be a promising candidate for gases storage.