Hydrogen sulfide is a toxic, corrosive and stinky gas, and required to remove using suitable treatment before it is released at the atmosphere. For removal of hydrogen sulfide, adsorption process with layered double hydroxides (LDHs) can be utilized because of the unique properties and structure. LDHs can be prepared by complexing co-precipitation technique, which is recognized as simple and economic method. The characteristics of the LDHs may be affected by the preparation parameters, i.e., molar ratio of chemicals, pH, and aging temperature. This study has been conducted to optimize the preparation conditions for Co-Fe layered double hydroxides in order to enhance the hydrogen sulfide adsorption. LDH was prepared with 50 mL of mixed solution (Cobalt and iron chloride) by co-precipitation method with different molar ratio of chemicals, pH, and aging temperature. NaOH and Na2CO3 were used as the base solution. Molar ratio of Co to Fe for the effective removal seemed to be 2 to 1, at which the adsorption capacity was found to be 0.27 g/g. The pH 10 was considered as the optimum pH for hydrogen sulfide adsorption. The maximum adsorption capacity for of hydrogen sulfide removal was observed at 40 °C to 60 °C of aging temperature. The results obtained from the XRD analysis showed the crystal structure of LDHs in the molar ratio ranged from 1 to 3 at pH 10 and 12. In effect of aging temperature, the crystal structure of LDH was confirmed from all conditions.

Optimization of preparation parameters for Co-Fe layered double hydroxides for hydrogen sulfide removal

254th National Meeting (2017)

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