Comparative Analysis of Hydrogen Sulfide (H₂S) Gas Adsorption in Activated Carbon from Sugarcane Bagasse and in Scoria Rock

Author : Limbo, Kennedy Pasia
Major Adviser : Bautista, Ramer P.
Committee Members : Gatdula, Kristel M.; Movillon, Jovita L.
Year : 2019
Month : June
Type : Thesis
Degree: BS
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Adsorption of hydrogen sulfide (H2S) gas was done using sugarcane bagasse activated carbon and scoria rock. Gravimetric analysis by precipitation was used as the quantitative method of analysis. The SEM images of both adsorbents showed the development of macropores based on the pore diameter ranging from 174 nm to 867 nm and 233 nm to 1250 nm for scoria and activated carbon, respectively. Results of Analysis of Variance showed that the adsorbent loading significantly affected the amount of H2S gas particles adsorbed. The adsorption efficiency increased as the adsorbent loading also increased. However, at very high loading, the adsorption efficiency started to decrease. The highest removal was found to be 91.08 % for activated carbon at 20.00 g loading and 79.69 % for scoria at 15.00 loading. The adsorption process for both adsorbents conformed with the Langmuir isotherm which meant that the process took place in a homogenous surface and the H2S gas particles did not move across the surface. The calculated RL values were 0.0485 for activated carbon and 0.0128 for scoria rock. The closeness of these RL values to zero and its deviation from unity, RL value of 1, suggested the irreversibility of the process which is an ideal case for adsorption. The maximum adsorptive capacities for activated carbon and scoria were 0.1385 mg H2S/g and 0.1852 mg H2S/g, respectively. Based on these results, the scoria exhibited a better performance in the adsorption process.

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