| Summary: | 碩士 === 國立宜蘭大學 === 環境工程學系碩士班 === 106 === In this study, the granulation method involving high-temperature sintering of ferro-carbon is used to investigate the feasibility of its degradation and adsorption, and the effects of subjecting it to aeration. The method involves uniformly mixing appropriate proportions of iron powder, activated carbon, calcium stearate, and glass powder before granulation in a compressor and sintering via aeration using high-temperature nitrogen. The ferro-carbon is applied to the adsorption of phosphate in water and tested using isothermal and dynamic experiments, and the effects of pH values are investigated. The material is also applied to the degradation of reactive black 5 (RB-5) dye in water and thereafter tested through the optimal pH and columnar adsorption experiments, and under dynamic experimental conditions. The aforementioned experiments are used to understand the characteristics of ferro-carbon in relation to the removal of inorganic and organic pollutants in water.
The optimum pH conditions for the removal of phosphate and RB-5 using ferro-carbon are pH 4 and pH 3, respectively. The adsorption behavior of ferro-carbon during phosphate removal complies with the Langmuir adsorption model, with the maximum adsorption amount (Qm) of phosphate estimated to be 14.77 mg g-1 at 40 °C. It is determined through the dynamic adsorption experiment that the adsorption reaction is consistent with the pseudo second-order adsorption model, and the activation energy is 6.08 kJ mol-1. The results indicate that the reaction is physical adsorption. The ferro-carbon has the best desorption effect in 1.5 M sodium hydroxide. The regeneration experiment reveals that its efficiency attenuates by 50% after 5 cycles. For removal of the RB-5 dye, the columnar adsorption experiment indicates a substantial decline in the removal of total organic carbon in the first 120 min. It is determined that adsorption and degradation may have occurred simultaneously during the first 180 min. The degradation reaction occurred after 120 min, whereas gradual removal occurred after 180 min. The oxidation–reduction (redox) potential during the columnar experiment reveals that a continuous redox reaction generates countless small electric fields, which in turn cause continuous degradation. The effectiveness of the ferro-carbon is observed to be significantly enhanced after another round of aeration. The dynamic experiment shows that the degradation process is consistent with the second-order reaction model. The adsorption rate constant of the material at 10, 25, and 40 °C is 0.0035, 0.0039, and 0.0044 mmol-1 dm3 s-1, respectively.
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