| 초록 |
Improper disposal of power plant fly ash is a serious burden to the environment, and its recycle and conversion into a porous silica product can be a useful alternative to bypass the problem. In this work, we prepared a mesoporous silica foam using the sodium silicate extracted from fly ash after acid washing and NaOH fusion. The structure directing agent Pluronic P123 was dissolved in the mixture of hydrochloric acid, trimethylbenzene,NH4F, and de-ionized water at 40oC for 24h, followed by aging at 70oC for 12h, and calcination at 560oC for 6h. The obtained mesosilica foam was examined for two different applications: 1) polyethyleneimine was introduced into the pores of the silica foam by wet impregnation and the composite was tested for CO2 capture, and 2) Nd3+ adsorption in water was carried out as a function of the contact time, ion concentration, and pH of the solution using the EDTA-functionalized mesosilica foam. |
