Modelling on adsorption of hydrogen sulfide (H2S) gas by using hydrogel biochar

H2S gas is a toxic, corrosive, colourless and flammable gas that need a great concern on safety when handling with this gas. Thus, the industry that produce H2Sgas require a unit operation include adsorption unit process on treating H2Sgas. Biochar is a type of adsorbent used to adsorb H2S gas. It is a safe and economical adsorbent compared to activated carbon. Hydrogel been merge with biochar toprovide high capability on adsorption of H2S gas. Hydrogel defines as water-swollensubstances. Adsorption model is used to determine the efficiency removal of adsorbent. The purpose of modeling an experimental adsorption is to determine theperformance of an adsorption which is crucial to optimize for the adsorptionmechanism pathway, effective adsorption design system and express on the adsorbent capacity. The process of adsorption modelling is based on Langmuir and Freundlichisotherm model. These type of isotherm model been used in this research study as themodel tend to suit the adsorption of solid-gas phase beside can determine theinteraction of adsorbate and adsorbent. Based on different flow rate factor that affect the adsoprtion process, value of R2 obtained from Langmuir model is 0.9902 while R2 for Freundlich is 0.9601 at flow rate of 60L/h with constant bed height of 6 inch. Meanwhile for factor of different adsorbent bed height, value of R2 fromLangmuir isotherm model is 0.990 while R 2 for Freundlich is 0.960 at adsorbent bed height of 6inch with constant H2S gas flow rate at 6 L/h. Thus, the experimental results showthat Langmuir model is the most suitable model to be used in the adsorption processas it has the highest correlation coefficient, R2 compared to Freundlich isothermmodel. Besides, the optimum parameter that can be used to optimize the adsorptionprocess of H2S by using hydrogel biochar is at H2S gas flow rate of 60 L/handadsorbent bed height of 6 inc. Lower the flow rate and high bed heigh tend to provide high capacity of adsorption.