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

Hydrogen sulfide (H₂S) is a chemical hazardous gas which commonly found in oil and gas refinery industry, waste water treatment unit process, coal gasification unit prcoess, and other processes. These industries provide their own treatment unit process to treat H₂S gas by adsorbing the gas. Thus, this prevent the gas from emitted to the atmosphere. Some reaches had been done in order to optimize the adsorption of H₂S gas. Thus, biochar is introduced as an alternative source of adsorbent to adsorb H₂S and the biochar been upgrade its adsorption capability by merging with hydrogel. Hydrogel provides a moisture content that enhances the adsorption process. Isotherm model been proposed in order to describe the physical occurring on the adsorption process in real system. The main objective is to establish most suitable isotherm model for hydrogen sulfide adsorption on hydrogel biochar. Langmuir and Freundlich isotherm is been introduce and its equation been used to plot a linear graphs. There are some factors that affect the adsorption efficiency which include the effect of flow rates and bed height. By referring these factors with the proposed isotherm models, the adsorption capacity and intensity of each different flow rates and bed height can be found. The results shows that lower flow rate and high bed height is an alternative factors contribute to the enhancement of the adsorption process. From the plotted graph of Langmuir and Freundlich isotherm model, a correlation coefficient, R2 can been determine in order to select the most suitable and fit isotherm model. The higher value of R2 indicates the most suitable type of isotherm model that can be used for the adsorption. Therefore, the results shows that Langmuir isotherm is the most suitable isotherm model compared to Freundlich as at lowest flow rate of 60 L/h, value of R2 for Langmuir is 0.9902 while Freundlich R2 value is 0.9601. At highest bed height, R2 of Langmuir is 0.990 while Freundlich is 0.96.