Preparation of Ferrite-Containing Ceramic Fiber Composites CO2 Decomposition

초록

Homogeneous precipitation method using urea decomposition was employed to induce in situ precipitation of Ni ferrite(Ni0.4Fe2.6O4) on porous ceramic fiber supports. Effects of process parameters such as concentration ratio of urea and nickel(Ⅰ) iron(Ⅱ,Ⅲ) salt solutions, period of aging and the pH of the solution on the synthesis of Ni ferrite from aqueous solutions by decomposition of urea were investigated to develop ferrite-containing porous ceramic fiber materials. Removal of residual chloride ions and urea by solvent exchange from the porous media after ferrite deposition apparently helps to form spinel ferrite, but does not increase the efficiency of CO2 decomposition. Porous ceramic fiber composites containing 20 wt% (1g) ferrite samples showed 100% efficiency for CO2 decomposition during the first three minutes, but the efficiency decreased rapidly after the elapsed time of ten minutes. The characteristic reduction time for the CO2 decomposition efficiency was estimated as about 3∼7 minutes.