Abstract-Bottom ash is a waste material obtained from electricity generation through combustion of coal at the Mae Moh power plant in Thailand. The adsorption of Cd (II) and Zn (II) ions from aqueous solutions onto bottom ash was studied using batch experiments. The effect of pH, contact time and temperature were investigated. Adsorption isotherm data for metal ions was analyzed by the Langmuir and Freundlich isotherms. The Freundlich isotherm properly described the adsorption data for all studied temperatures. The results revealed that the adsorption kinetics followed pseudo-second-order kinetic model. Thermodynamic parameters such as Gibbs free energy change (∆G°), enthalpy change (∆H°) and entropy change (∆S°) were investigated. The calculated values showed that the adsorption process for both Cd (II) and Zn (II) ions was endothermic.
Characterization of planting materials used as adsorbent has been studied in order to compare potassium ion adsorption on two types of planting materials, which are a fired planting material (FPM) made from a mixture of 4 kinds of wastes (bottom ash, flue gas desulfurization (FGD) gypsum, paddy soil and sawdust) formed and fired at 850 ℃ and the commercial planting material called "hydroball" (HDB) bought from Jatujak market, Bangkok. The physical characteristics of both types of planting materials indicate that the FPM has a larger specific surface area than the HDB. The factors affecting potassium adsorption on both the planting materials such as an equilibration time and some solid/solution ratios were investigated. The suitable equilibration time for the adsorption to reach an equilibrium on the FPM and HDB is one and two hours, respectively. The highest amounts of potassium ion adsorbed on both the planting materials were obtained when the solid/solution ratio was 1∶15. The adsorption behavior on both the planting materials tends to correspond with the Freundlich isotherm.
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